Method for controlling chemical technological process

FIELD: group of inventions is related to current control and improvement of operation parameters of chemical technological process due to current control of transfer processes, connected to normal operation of equipment positioned downstream.

SUBSTANCE: method for controlling chemical technological process includes current control over signal, connected to technological equipment positioned downstream relatively to chemical reactor, to determine transfer processes occurring there, while current control of signal includes periodic current control of signal of scanning line position from device, which carries information relatively to nominal operation parameters of process and following periodic observation of signal for detection of one or more transfer processes in aforementioned technological equipment above or below scanning line, which arced to alternation of material quality, received during chemical production process, then connection between change of product quality and detected transfer processes is determined, process parameter adjustment, connected to technological equipment positioned upstream, in response to change of quality of product. Also presented is method for controlling production of polyolefin in process of polyolefin production, for which reactor is utilized for polymerization of polyolefin.

EFFECT: improved sensitivity of control, simplified control over process.

2 cl, 3 dwg

Background of invention

In many chemical processes use chemical reactors for conversion of chemical raw materials in the desired solid, gaseous or liquid intermediate and final products. During the production of desirable products, these materials undergo different processing equipment located downstream of the chemical reactor. This technological equipment usually operates transportation, processing, introduction to reaction intermediate streams, waste streams and stream recycling, and final products, so that the desired end product is obtained in a form which is necessary for shipment to the end user.

As an example of this process can lead production in the gas phase polyolefin, such as polypropylene or polyethylene, from a gaseous source materials. In this type of process one or more gaseous source of monomers react in a chemical reactor in the presence of a catalyst, resulting in get powdered polymer. The powdered polymer is then typically subjected to extrusion in the block finishing to obtain pellets. Such pellets are easy to transport, and they is there to be used for the manufacture of products based on polymer, such as molded articles, films and fibers.

In ideal conditions the reactor, such as reactor polymerization, discussed above, can produce a powdered product having a relatively predictable distribution of particle sizes. Located downstream processing equipment powder designed for such a predictable distribution of particle sizes. Unfortunately, under conditions which differ from the ideal, the polymerization reactor can create the lumps (lumps)or fibers (filaments), which are agglomerates of polymer particles, the size of which is significantly higher than expected.

The presence of fibers and pieces can serve as an initial indication that the polymerization reactor does not function optimally. Unfortunately, prior to significant deterioration of the operating parameters of the reactor, the presence of these fibers and pieces often impossible to observe directly. Furthermore, the presence of fibers and pieces in polymer powder is often masked by the process of granulation, in which the extruder operates at a temperature and pressure sufficient for granulation some undesirable large particles.

Different from the optimal functioning of the reactor, the indication of which is the presence of unwanted large particles, requires change the operating parameters of the reactor to improve his work. Moreover, while the process of finishing product sometimes allows you to convert fiber and pieces in macroscopic form acceptable to the end user (such as pellets), the supplied material may contain submicroscopically heterogeneous region (i.e. a localized area inside the granules), which can negatively to occur during the use of the supplied material by the end user.

In most cases, the above-mentioned problems can be detected earlier delivery of the product to the consumer through various programs of sampling and rapid quality control. However, the use of such programs does not allow for early, real-time display is not optimal process conditions that would allow the reactor operator to perform corrective action in order to avoid the formation of non-uniform material or to minimize it.

Online analyzers product can be used to obtain information useful for process control, which allows in some cases to minimize the heterogeneity of the product, however, online analyzers cannot detect many types of unwanted variations of the product.

In this regard, sensitive, in ealem time the method of indirect control of education heterogeneity of intermediate and final product in the chemical process, namely, the way in which you do not use online analysis equipment. This method should allow the operator chemical process to intervene in the operation of the equipment manually or by using automatic control systems, so as to minimize or eliminate the formation of an inhomogeneous material. Such early detection and intervention can adjust the parameters of the process equipment, such as a chemical reactor, prior to commencement of significant failures in the chemical reactor, or other equipment, and earlier production of significant quantities of material that does not meet the technical requirements.

Summary of invention

The inventors have unexpectedly found that by controlling minor transient characteristics of the signals from the downstream processing equipment, you can detect the presence of non-homogeneous (heterogeneous) products, such as polymer fibers, pieces or other abnormally large particles. This information can then be used for corrective actions, previously quite pronounced presence is the conduct of these unwanted products, which may cause the failure of process equipment, and within a time less than that required for direct observation of the operating parameters of the reactor or other located upstream of the equipment, or when sampling quality control.

Transients that are useful for early detection of undesirable changes in the material handling, manifested in the form of a relatively high frequency "spikes", which has a relatively short duration and of relatively high amplitude compared to low-frequency changes of the signal processing equipment, obtained under normal operating conditions.

The current control signal is not a direct measurement of the chemical or physical parameters of the desired product of chemical reactions (using an analytical device), such as direct measurement of particle size or dimension of the lateral fraction of the material process for determining viscosity. Rather, these signals are such that normally exists in the work of technological equipment.

Transient signals downstream process equipment can be used to change the operating characteristics in the case where it is impossible or difficult to measure the desired parameters of the material, or when the character is erotici material cannot be measured directly, or quickly using the online analyzer product.

For example, transients that appear in the signal representing the motor current node located downstream of the rotating equipment, can serve as an indication that the equipment operates with the introduction of heterogeneous product (such as a piece of polymer) located upstream of the source. These relatively short transients are often well tolerated process and control equipment and does not have a visible significant impact on his work. Often the existence of such transients do not even notice if you don't take deliberate efforts to measurement or observation of such transients. However, after the discovery of the presence of such transients, additional analysis shows their correlation with the heterogeneity of the product, so in accordance with the present invention it is proposed to produce control signals to obtain an early indication of the need for adjustments located upstream equipment.

In the above example, the present invention allows highly sensitive and timely detection of the presence of fibers and pieces, whereas normally these large particles pass through the reactor and often even through the extruder until they become too large. Analysis of the current is the first signal of the engine powder material shows the presence of small peaks, caused, probably, by introducing small pieces of material between the rotary vane feeder and its enclosure. This early indication of deterioration of process parameters allows for the timely control action at that point in time when the change of parameters is small and can be easily implemented.

In accordance with the first variant, in the present invention is disclosed a method of controlling a chemical process, which primarily produce a current control signal associated with the downstream process equipment to detect transients present in the signal. Then you can change the quality of the product associated with the detected transition and adjustment parameters located upstream equipment in response to a change in the quality of the product.

Although the invention can be used to monitor located upstream of the equipment, when the material whose quality control is solid or viscoelastic, such as a polymer melt, the present invention is particularly useful in the production of polymer powders, such as polypropylene and polyethylene.

Technological parameters located upstream equipment is, which can be changed include the change of the flow of catalyst and socializaton, an electron donor, monomer and co monomer, hydrogen, a change of attitude of the catalyst to acetalization, the change of the flow agent to control the activity of catalyst, flow quenching reactor inventory change materials in the reactor, the temperature and pressure of the reactor, and the control can be effected directly or indirectly by changing other parameters, due to the mixing in the reactor or fluidization, and by combinations of these possibilities.

The present invention is particularly useful for obtaining indications of agglomerated powders, when the monitored signal carries information about the parameters of the equipment for processing of powder, such as a rotary powder feeder.

In accordance with a preferred variant implementation of the present invention, produce a current control signal in the form of electric current, voltage or frequency, the signal hydraulic pressure or pneumatic pressure signals, as these signals are often transients of this type, which may have a correlation with minor changes the quality of the product.

In accordance with the embodiment of the invention, the operation current is its control includes the following steps: periodic current control signal for finding the line scan from the device, which carries information relating to the nominal operating parameters of the process; subsequent periodic monitoring of the signal for detecting one or more transients above or below the line scan, which is associated with changes in the quality of the material obtained in the chemical production process; and initiating the operation of process control equipment located upstream of a chemical reactor, in response to one or more of the transition process. Additionally, the operation of the current control may include periodic current control signal for finding the line scan from the device, which carries information relating to the nominal size of the powder; periodic signal with equipment for processing of powder to detect events associated with the transition process above the line scan; and the initiation of the operation control process in response to one or more of the transition process.

Used in the description of the present invention, the term "located downstream process equipment" means equipment, which is located downstream of the chemical reactor, which is used for the manufacture or finishing of a chemical product, including, for example, motorsound the equipment, such as pumps, conveyors, feeders, extruders and the like, but excluding equipment used for direct measurement of physical or chemical parameters, such as gas chromatographs, online spectroscopic equipment or analyzers viscosity lateral fraction or flow velocity of the melt. However, this definition does not preclude the use of information that can be obtained from the process analyzer, such as a circuit controller of the rotation frequency of the pump motor, which is used for sampling in sequential viscometer.

Signal associated with the downstream process equipment, can be any signal, which allows the management of such equipment or to carry out its current control. Thus, this term includes both the control signals, such as signals of the motor current, and signals that provide information regarding the status of equipment, such as engine temperature, and the temperature or pressure in it.

Under "process parameter related to the upstream equipment" should be understood as any option that is useful for controlling the unit process equipment located at the point previously("upstream") in the chemical production process, allows you to control the quality or quantity of material produced at a point located above the downstream process equipment. Examples of such parameters are the flow control of the source material or catalyst introduced into the reactor, or control of cooling water supplied to located upstream of the heat exchanger. Experts in the field of chemical production can easily give other examples.

In accordance with another variant of the present invention, produce a current control motor current rotary feeder or other equipment for powder handling, located downstream of the polymerization reactor, in the presence of transient processes that indicate the presence of particles of an unusually large size. Can monitor changes in the amplitude and frequency of these transients to determine the presence of inhomogeneous flow reactor, which is difficult to detect otherwise. Can then be taken corrective action to minimize the production of unwanted material.

Used herein, the term "equipment for powder handling" means any equipment that is used for transportation, actual processing powdered mother of the La, or influence on him. Such equipment for processing powder includes (but without limitation) lines and valves to move the powder, such as system Montagu, powder feeders or conveyors, extruders and column cleaning (purging).

Brief description of drawings

Figure 1 shows a block diagram of the reactor system for the production of polypropylene, which is used as a means of detection and control in accordance with the present invention.

Figure 2 shows a perspective view of a rotating powder feeder, which is discussed in connection with the present invention.

Figure 3 shows the functional diagram of the detection of the peaks and the total algorithm, useful for implementing the present invention.

Description of the preferred option

In the following description discusses the present invention in the modern system of the reactor for the production of polypropylene. However, it is easy to see that this use of the invention in the system of the reactor for the production of polypropylene is only an example, and the present invention can easily be used in various applications in which the quality of the materials obtained by means of a chemical reactor, it is difficult to monitor directly.

Figure 1 shows a simplified block diagram with the system of the reactor for the production of polypropylene 10 in accordance with the present invention. This system 10 may be used for the production of homopolyamide and random copolymers of propylene and ethylene. In its most simple form, the system includes a first polymerization reactor 12, stretchable bag filter 14, the rotary feeder 16, column purification 18, the second rotary feeder 20 and the pellet 22.

Homopolyamide can be produced in the reactor 12 in submission to him propylene, catalyst and any desired socializaton and modifiers, which is in itself known.

The reactor 12 is primarily horizontal reactor, which contains located along the axis of the reactor 12 mixer. Polymerization in the vapor phase polypropylene in such a reactor is described in detail in U.S. patents Nos. 3957448; 3965083; 3971768 and 4627735.

In the reactor 12 polymerization in the vapor phase receive mainly due to Isobaric process using any of a variety of well-known catalyst systems, providing a high yield of product. Typical catalysts are solid materials based on transition metals on a carrier of a metal oxide, halide or salt. System catalyst on the carrier, on the basis of the titanium halide containing magnesium, are well known and are preferred for many applications, and they are often used in conjunction with juice what alization alkyl aluminum. The preferred catalyst is a catalyst Amoco CD brand, which is manufactured by BP Amoco Polymers, Inc. of Alpharetta. Georgia (USA).

The catalyst, socialization and any desirable properties, such as materials on the basis of silane is injected into the upstream end of the reactor 12. Control the flow of socializaton and modifier and their ratio (the content) to the catalyst in accordance with the technical requirements of the production and supply of catalyst regulate to achieve the desired performance of the reactor.

The polymer powder is usually formed around the solid catalyst particles in the reactor 12. When operating, the reactor 12 is typically filled with half a polymer powder, which moves by means of stirrers, close to cork (porshneva) stream mode, towards the end of the unloading of the reactor 12. The stirrer of the reactor contains many transverse blades connected with a longitudinally oriented drive shaft mounted on the axis of the reactor 12.

The heat of polymerization is removed from the reactor 12 through the evaporative cooling of the recycled propylene liquid (liquid quenching (rapid cooling), which is sprayed on the surface layer of the polymer powder formed in the reactor 12. Unreacted propylene pairs paritaetischer 12, and then is separated from any entrained small polymer is collected and sent back to the reactor 12. Pairs of reactor partially condense, accumulate, and the resulting liquid is pumped back to the reactor 12 to remove heat of polymerization. Fresh portion of propylene is added to the recirculation flow, and not the condensed vapor is compressed and recycled back to the reactor 12. Fresh hydrogen is added to this thread for molecular weight control, based on a prescribed molar ratio of hydrogen to propylene. The recirculated gas is fed to the bottom of the reactor with a flow rate related to certain managed relationship with propylene flow damping. For the production of homopolymer propylene is the only monomer fed into the system. For random production of a copolymer, a relatively small and manageable number of the ethylene co monomer added to propylene.

Polypropylene powder is removed from the reactor 12 through a system of Montagu (not shown). System Montagu includes cycleroute ball valve which opens for a few seconds 3 or 4 times per minute, to force the display of polypropylene powder from the reactor 12. Under nominal operating conditions polypropylene powder removed using system Montagu, typically has an average particle size of the landmark, the adjustment from 500 to 600 μm, with the distribution of particles sizes from fines to approximately 1200 microns or so. Particles larger than 1200 μm are undesirable, and particles that can create transients in accordance with the present invention, are particles with dimensions sufficient to cause the observed transition in located downstream equipment for process control.

Polymer powder, which is discharged through cycleroute ball valve, enters the expanding gas bag filter 14, and after it usually remains a pressure of approximately from several hundred pounds per square inch (psig to 5 psig. Polymer powder with reduced pressure fills the cylindrical tank (see below the discussion of figure 2), located directly above the rotary feeder 16, which measures the polymer powder for feeding to the column cleanup 18.

In column cleanup 18 serves vapour and nitrogen for deaktivirovana of the catalyst and removal of any residual gaseous hydrocarbon from the polymer powder. Then the second rotary feeder 20 measures the purified polymer powder in the pellet 22 to form granules of the polymer.

Figure 2 shows more details of the rotary feeder 16. The feeder 16 has a hole for receiving powder from cylindricus the th tank (tower) 23, a cylindrical housing 24, a set of rotating blades 26 mounted on the shaft 28 and the outlet 30, which allows to deliver the metered quantity of powder in the column purification 18 (see figure 1). The open space between the outer edges of the blades 26 and the cylindrical body 24 is reduced to practically possible, to prevent reverse flow of gas through the rotary feeder 16 to the filter 14 (see figure 1). Mainly in the cylindrical housing 24 may be provided with vents (not shown), through which gas is included in the area drained when removing powder in the column purification 18, may extend from the feeder 16 before the receipt in the gas-filled area of fresh powder from the cylindrical tank 22.

The shaft 28 is rotated by a motor (not shown) at a speed corresponding to the desired speed of the powder. In accordance with the present invention, the presence of fibers or other abnormally large particles or lumps in the polymer powder passing through the feeder 16 can be detected by using a current control of the motor rotation shaft, which is required to maintain the speed of the feeder needed to provide the desired speed of movement of the material. Any large particles or fibers of a polymer, which have DOS is large enough to interfere with the smooth passage of the powder through the feeder 16, will create a transition in the current of the motor shaft when the rotation speed regulator motor strives to maintain the desired feed rate of the material when the additional resistance created by the fibers or pieces of material, retarding the movement of the blades 26. An increase in the frequency or amplitude of the motor shaft is often the first indication that the working conditions of the reactor has deteriorated so much that formed sufficiently larger particles, and that requires analysis and adjustment of operating conditions of the reactor.

The invention allows for highly sensitive measurement of operational parameters of the reactor, because small fibers and pieces that can easily pass through the reactor and through the processing of the powder of the reactor, however, create peaks in the motor current when they get stuck in a relatively small clearance between the blade 26 and the cylindrical wall of the housing 24, the resulting gain an early indication of deterioration of the operational parameters of the reactor, which cannot be obtained by direct observation of the operating parameters of the process in the reactor.

In the early variant of the invention, the current control transients in the motor current produced by connecting the tape recorder type Gould Windograf 980 to the actuator of the variable frequent which you ("VFD") of the motor rotating shaft of the feeder 16. In this case, the signal from the drive variable frequency was directly proportional to motor current. Engineer manual notes the number of times the tape recorder registers transients exceeding deviation of 20% from the line scan (baseline) motor current. These data were used as a direct indication of the production of fibers and pieces. For an additional analysis was made of the processing of the received information using the spreadsheet program EXCEL. After this has taken steps to minimize the formation of undesirable large particles.

Additional experience when using the current control signal of the variable frequency drive has led to the need for the introduction of a signal in a distributed control system ("DCS") to conduct its more complex processing. Figure 3 shows in more detail the logic circuitry, which is used for the detection and analysis of transient processes in the motor current occurring due to the operation of the rotary feeder 16.

Logical control circuits typically include detection algorithm picka 31 and the synthesis algorithm peak 32.

The peak detection algorithm 31 begins with the reading of the signals that carry the information about the current drive motor variable frequency rotary feeder every 10 seconds when held and 36. The objective of this activity is to determine whether the current signal of the motor 120 signals, which are stored in an operation 38, and then used to calculate the bending line scan motor current. The bending line scanner is used everywhere in the detection algorithm, picka 31, as discussed below. If you find that the signal of the motor current less than 2.9 amps, the value of this signal is not stored in operation 38. Ignoring signals motor current amplitude less than 2.9 amps prevents the inclusion in the average value of the undesirable events, such as stopping of the feeder or in the inverse mode. This allows you to avoid storing zero or negative values in an operation 38, and this branch of the algorithm finished with surgery 42.

Upon detection of each new value of the motor current in excess of 2.9 amps, remember it in operation 38. Introduction to memory each new value leads to the loss of the "old" 120 data stored in an operation 38, resulting receives an updated set of data points, which are then used in operation 40, for the calculation of the rolling average of scan lines, based on the last 20 minutes of collection bath (120 data points/ 6 data points per minute). This moving average line scan using the t in other places of the algorithm to detect peaks.

Every 80 MS make the comparison in operation 44 signal, which is measured in operation 33, the value of the rolling average line scan, computed in operation 40. Suppose that an event of type "peak" begins whenever the measured signal by 15% or more greater than the bending line scan ("switching value"), and believe that this event ends when the signal falls below the switching value. Thus, when the signal exceeds the switching value, the flag detection peak appears in an operation 46, then the counter will scan get the increment in operation 48 and peak integrate to obtain its full square in operation 50.

If the measured peak amplitude does not exceed the maximum amplitude of the peak, then this branch of the algorithm finishes when using the operation 54. However, if the peak amplitude exceeds the maximum peak amplitude stored in operation 52, the maximum amplitude peak is set equal to the measured amplitude, and this branch of the algorithm finishes when using the operation 54.

Data from operations 48, 50 and 52 used in the operations 58 and 60 for calculating and storing data associated with the presence of peaks, their duration, size and amplitude. This information is used in the composite algorithm peak 32, which is described below.

In summary the algorithm peak 32, counters swadc the data on peak per minute, updated every second in an operation 62, in order to reflect the most recent mobile values of the peaks, their duration, size and amplitude. These values memorize every minute in operation 64, and is used in an operation 68 to calculate the current average values of the peaks for 60 minutes and their duration, size and amplitude. These values give the dynamics of the process in operation 70, where they record the current average values of the peaks for 60 minutes, useful for estimating parameters of the equipment in accordance with the present invention.

Optionally, the above algorithm can be modified and it can be enabled mobile averaged line scan for all expired period of time, which varies depending on the type or number of observed transients. For example, if the monitored signal is a current of the pump motor, which is used for moving viscoelastic fluids, such as polymer melt, and if the observed transients vary in width (i.e. in time) as a function of melt temperature, the program may include the operation of increasing the frequency of sampling within existing periods of relatively shorter transients and reduce the frequency of sampling within existing periods of relatively longer transition the processes. If necessary, the routine may include a limiter or filter for low-frequency changes associated with normal management process, did not make errors in longer transients.

The above algorithm, as well as its settings and time periods, are given only as an example. In accordance with the present invention can be used any program or device that can detect the presence of transients in the low-frequency control signal. The only requirement is that such a program or device had a quick response, sufficient for detection of the transition process. This program or device can be controlled, for example, only the peak amplitude or area, or total peak area per unit of time that may be necessary in some circumstances that can be easily understood by experts in the field of control systems.

Various ongoing manually control actions can be taken in the example above, to reduce the production of fibers and pieces, in response to the increase or the increase of the amplitude of the peaks. Such effects are well known in the art and include, for example, the change of the flow of catalyst and socializaton, an electron donor, is onomer and co monomer, hydrogen, the change of attitude of the catalyst to acetalization, the change of the flow agent to control the activity of catalyst, flow quenching reactor inventory change powder in the reactor, the change of mixing, temperature and pressure of the reactor, and control can be done directly or indirectly, by changing one or more of these parameters, as well as due to a combination of these possibilities. General information regarding the polymerization of propylene and management. in combination with the implementation of the present invention, may be gleaned in the book "Handbook of propylene" ("Propylene Handbook", edited by Edward P. Moore, published by Hanser/Gardner Publications, Inc., Cincinnati, Ohio (1996)). For example, the list of catalytic poisons, which can be used as agents to control the activity of the catalyst is contained on page 299 of this book.

The desirability of these control actions is not obvious and allows you to get early diagnosis (indication) to the inhomogeneity of the powder by controlling the motor current of the feeder.

Note that in the previous examples can be used rotating the feeder 16 or 20, or both of them, for more information about the transition process. In some cases, the combination of transient processes can provide more specific information is on the need for management to the upstream equipment. Needless to say that the use of multiple sources of transients from the same or from different units of technological equipment is not beyond the scope of this invention.

Conversion of olefinic materials in the powder of polyolefin in the method according to the present invention may occur at least partially in the gas phase in the reactor.

Although description was conducted in the manufacture of polypropylene powders in the system supplications chemical reactor with a stirrer, in the gas phase, the same concept can be used in any other chemical process, which is used to obtain a solid material or a viscoelastic fluid. The only requirement is the ability of the current control signals associated with downstream equipment to detect transients, which may be correlated with changes in the nature of the material being produced. For example, the present invention can be used in combination with a fluidized bed reactor, which allow to obtain powders of polypropylene or polyethylene, much like previously described. The present invention can also be used in conjunction with liquid reactor with a stirrer or in conjunction with slurry react the AMI, intended ultimately for the production of powder, even if the obtained powders first, you select from a suspension or solution, previously processed powder. Among other examples are (but without limitation) current control signals from various waste streams or from equipment recycling, which is used for treatment of process fluids, regardless of whether the desired end product is solid, liquid or gaseous, and the only requirement is that the material is undesirable quality created transients that may be associated with undesirable quality, and that it was possible to observe signals from downstream process equipment.

The authors believe that it is possible to conduct ongoing monitoring of high-frequency transients for most types of downstream equipment or technological measure, in order to manage to the upstream equipment and improve the quality of the product, using techniques that are compatible with the previously described herein in detail way. The signals of the electric current, voltage or frequency, the signal hydraulic pressure or pneumatic pressure signals are preferred the additional signals for monitoring transient, because such signals are often transients of this type, which may correlate with subtle changes in the quality of the product, and therefore provide an early indication of the need to change working conditions located upstream equipment, and in particular, the working conditions of a chemical reactor. In this regard, it should be noted that in cases when there are alarms or monitors associated with downstream process equipment, the signals for switching such alarms or to exercise significant direct control of downstream equipment, are more powerful than considered here transients associated with the implementation of the present invention. In fact, you typically have to install new equipment or modify existing equipment to allow you to detect minor transients, carrying the information on the early changes in the quality of the material, and these transients are outside the natural range of controls downstream equipment, or are too quick to detect installed downstream of the control equipment.

Therefore, used in compliance and with the present invention, the term "transient" means a high-frequency peak, imposed from above or from below (i.e. positive or negative peak on the low-frequency signal, such as signal control motor current. In accordance with a preferred variant, transient or transients are such that their cumulative effect on the direct control of the downstream process equipment is negligible. Peaks that trigger alarms or shutdowns are too large amplitude in order to consider them as transients that are useful for management to the upstream equipment in accordance with these preferred variants of the present invention.

Often it is preferable to use a variety of transitional processes as events, which leads to the change management process, and in this case, a group of transient processes is called a "series" of transients. If you measure one of the transition process or series of transient processes relatively movable averaged line scan showing low-frequency changes of the monitored signal, such that the transition process or series of transient processes are called "transition process with a moving average line time is ERDE" or "series of transient processes with moving average line scan." If you have the necessary equipment to detect transients, present in the signals equipment, it is only necessary to compare the observed transients with stable and undesirable working conditions and with the appropriate quality of the material, to determine which transition processes provide information that is useful for operations management process in accordance with the present invention.

In another example, namely, in the polymerization of propylene, the peaks of the pressure on the suction side of a gear pump extruder may have a correlation with poor management of a powder feeder of the extruder, or the accumulation is not molten polymer on the package nets (located between the extruder and the pump head of the extruder). Therefore, the current control of a gear pump may be used to indicate the desirability of varying the process parameters of the equipment located upstream of the extruder, to improve the powder feeder or to minimize the formation of materials that could clog the package nets. It should be borne in mind that the change management process for any equipment located upstream of the extruder (i.e. any located upstream equipment, not only of the reactor), which allows to improve the quality what about the material or operational parameters in located downstream location, also not beyond the scope of this invention.

In another example, namely, when the current control pressure peaks that appear on the release of the water pump (granulator) polymer granules, these peaks can be associated with poor granulation in the plate matrix extruder or a blockage of transmission line material. This indication can be used to control process parameters associated with the extruder, and can also be used for finding and Troubleshooting, to increase performance, reduce downtime and maintenance and current repair, and to increase the production of high quality products.

Current control signals downstream equipment that is not a direct measurement of the chemical or physical parameters produced to identify the need for early management process, such as was described herein above, can be integrated (entered) in the equipment control reactor for the formation of a closed-loop control system reactor. The amplitude of the signal can be determined empirically or by using computer software that allows the accumulation of a set (kit) data directly or by estimation of the parameters then can be made in the determination of the optimal response for a specific pattern observed transients. Software that is used to control chemical processes and which can be one of the input signals from the downstream equipment can be purchased, for example, the firm Pavilion Technologies, Inc. of Austin, Texas (USA) or other suppliers, or can be developed by experts in the field of designing control systems.

The detailed description focuses on the specific example of how you can control the engine of the powder feeder to obtain information useful for managing upstream of the reactor system. However, experts in the field of management will easily understand that after reading this description of the almost any located downstream equipment, which has an associated low-frequency signal that can be analyzed for the presence of high frequency transients, can provide a sensitive indication of changes in the chemical reactor or other operational parameters located upstream of the equipment, and therefore can be used in accordance with the present invention. Therefore, the present invention is not limited to the given examples, but only by the following claims.

1. The method of controlling a chemical process including current control signal, associated with downstream relative to a chemical reactor process equipment, in order to detect flowing therein transients, the current control signal includes a periodic current control signal for finding the line scan from the device, which carries information relating to the nominal operating parameters of the process and subsequent periodic monitoring of the signal for detecting one or more transient processes in the specified process equipment above or below the line scan, which is associated with changes in the quality of the material obtained in the chemical manufacturing process, and then carry out finding the communication quality product with the detected transition, the regulation of the process parameter associated with to the upstream process equipment, in response to a change in the quality of the product.

2. The method according to claim 1, wherein the monitored signal is selected from the group which consists of the signal electric current, voltage or frequency, and the signal hydraulic pressure or pneumatic pressure.

3. The method according to claim 1, in which is located upstream of the equipment is a chemical reactor, which is used for the production of polymer m is material.

4. The method according to claim 1, wherein the monitored operating parameter associated with the equipment for processing of powder.

5. The method according to claim 4, in which the chemical reactor used for the production of polymer powder, and the monitored operating parameter of the downstream equipment is a motor current of the equipment for processing of powder, while the quality of the product associated with the observed transition, characterized by the presence of aggregates of polymer powder having a size greater than nominally produced using the reactor under normal operating conditions of the reactor.

6. The method according to claim 5, in which the polymer powder is a powder of polyethylene or polypropylene.

7. The method according to claim 1, in which is located upstream of the equipment is a chemical reactor, and adjustable process parameter associated with to the upstream equipment is chosen from the group which includes the supply of catalyst and socializaton, the supply of electron donor, the feed monomer and co monomer, the supply of hydrogen, the ratio of the catalyst to acetalization, supply management agent activity of the catalyst, the flow quenching reactor, agitation or fluidization reactor, the supply of powder in the reactor, temperature and pressure react the RA, as well as their combination.

8. The control method of obtaining powder of polyolefin in the production process of the polyolefin with the use of the reactor for the polymerization of olefins, comprising a current control signal associated with the operation of the equipment for processing of powder located downstream of the reactor, carried out in order to detect flowing therein transients, the current control signal is a periodic control signal for finding the line scan from the device, which carries information relating to the nominal size of the powder, and includes periodic signal with specified equipment to detect events associated with the transition process above the line scan, and then carry out finding the links present in the polyolefin powder undesirable large particles of the powder with the presence of transient processes and the regulation of the process parameter associated with the reactor for reducing the presence of powder undesirable large particles, as well as an adjustable parameter selects the flow of catalyst and socializaton, an electron donor, monomer and co monomer, hydrogen, management agent activity of the catalyst, flow quenching reactor, the ratio of the catalyst to acetalization, agitation or fluidization of the solution, the supply of powder is in the reactor, the temperature and pressure in the reactor, and combinations thereof.

9. The method according to claim 8, in which the equipment for processing of powder is a rotary powder feeder.

10. The method according to claim 8, in which the conversion of olefinic raw materials in powder polyolefin is at least partially in the gas phase in the reactor.