Methods of extraction of propane with high yield and device for its implementation

 

The proposed method and installation are intended for separation of hydrocarbon gas. Installations for the extraction of propane from the gas supply includes an absorption column to produce cold first exhaust steam and the resulting liquid, a heater for heating the portion of the received fluid to generate it in a gaseous form, the second column, which receives a portion of the received fluid in the gaseous state and which generates a second exhaust steam. The second column is additionally connected liquid stream from the condenser, which forms irrigating the condensate. The capacitor uses the cold part of the first exhaust steam as a cooling agent. The first part of irrigating condensate is supplied by recycling the second column, and the second part irrigating condensate enters the absorption column. On the second version of the complete plant includes a gas-separating element and ethnoastronomy column, which further includes an integral capacitor on the top of the column, which produces irrigating the condensate. Method of increasing the recovery of propane from the gas supply is to use absorption and ethnoastronomy columns forming the primary circuit of Greece second recirculation circuit, in which the second part of the irrigating fluid enters the absorption column, and forming a third loop recycling, which receive the fluid from the absorber comes into heat exchange with the purpose of cooling the gas supply absorber and enters atanother column. These technical solutions provide increased recovery of propane from the gas supply. 3 S. and 17 C.p. f-crystals, 1 Il.

This application is based on provisional application US 60/161297 filed 10.21.99 and incorporated into the present application as its integral part.

The scope of the invention is the separation of hydrocarbon gas.

Propane is a valuable component of industrial gases, and in the art-known variety of ways, including a process based on the cooling and freezing gas, oil absorption and absorption cold oil, and, in particular, the processes of cryogenic expansion. However, all or almost all of them have one or more disadvantage.

For example, in U.S. patent 4157904, stated Campbell (12 June 1979), in the process of extracting propane apply the cooled flow of the supply gas, which is partially condensed, and then expand at a lower Yes nerovnoi fluid flow, with a lower starting point boiling, cooling one or both threads before expansion. The advantage of this method of extraction, stated Campbell, is an overall increase of efficiency of energy use, however, the process requires at least some additional structures receipt, which increases the cost of construction.

In another example, in U.S. patent 4854955, stated Campbell et al. (August 8, 1989), the process of extracting propane involves separating the hydrocarbon stream into first and second streams condensation and expansion of the first stream, which then enters the heat exchange with the exhaust gas from the distillation column. Some portion of the partially condensed flue gas from the column is supplied for irrigation in the distillation column. Although the design claimed Campbell, increases to some extent the extraction of propane, but the supplied feed gas typically impose a limit gas supply must be dry.

In the following example, in U.S. patent 5890378 declared Rambo et al. (6 April 1999) described the design for the improved extraction of propane, which is missing a large part of the equipment is the cue outputs of propane. Although the design of Rambo in the ground and reduces the cost of the equipment, at least to some extent, the processing flow of the supply gas in the vapor phase, and wet fluid from the feed gas typically requires separate processes, involving a considerable amount of equipment.

The closest technical solution is a method and apparatus for extracting propane supply of gas for U.S. patent 5685170 published 11.11.1997. Known device includes an absorption column that receives the gas feeding the absorber, and which generates a cold exhaust steam and the resulting liquid, and a heater that heats at least a portion of the received fluid to generate the received fluid in gaseous form. Know how to extract propane from the gas supply includes the use of an absorption column and the formation of recirculation paths. The known process is sufficiently intensive, requires a large amount of equipment.

Although this technology is known for a variety of processes, all or almost all of them have one or more drawbacks. Thus, the present invention is the necessity of usgo gas.

This task is solved in that the apparatus for extracting propane from a feed gas comprising an absorption column that receives the gas feeding the absorber, and which generates a cold first exhaust steam and the resulting liquid, and a heater that heats at least a portion of the received fluid to generate the received fluid in gaseous form, further includes a second column, which receives at least a portion of the received fluid in a gaseous state and which generates a second exhaust steam, and the second column is additionally connected liquid stream from the condenser, which forms irrigating the condensate, when this capacitor uses at least part of the first cold exhaust steam as a cooling agent, and the first part of irrigating condensate is supplied by recycling the second column, and the second part irrigating condensate enters the absorption column.

The second column may include atanother column.

The capacitor in the proposed installation can be an integral capacitor on the top of the column (integral overhead condenser).

As a cooling agent in the condenser can be applied pentachloro dehydration (integral water removal contactor).

In ethnoastronomy column in the proposed apparatus can additionally do wet liquefied feed gas.

As a dehydrating agent in an integral device for contact dehydration can be applied triethylene glycol.

The second column includes atanother column in the specified unit may further generate purified receive the fluid, in this case this purified received liquid can mainly include propane and higher hydrocarbons.

In the capacitor of the proposed facility may additionally do the cooling agent from turbomachines.

As a cooling agent in the condenser is at least partially can be used propane.

The absorption column may be made of stainless steel, and atanother column can be made of low temperature steel.

This task is solved in that the apparatus for extracting propane from a feed gas comprising an absorption column also includes gas-separating element for the supply of gas, which enters the wet process gas and which produces a wet feed gas in a gaseous form and wet liquefied the I column includes an integral device for contact dehydration, this atanother column further includes an integral capacitor on the top of the column, which produces irrigating the condensate, the first of which came recycling in ethnoastronomy column, and the second part enters the absorption column.

Specified gas-separating element for feeding gas may include vapor-liquid separator.

In the proposed apparatus at least part of the wet supply of liquefied gas may be evaporated in ethnoastronomy column using reboiler.

At least part of the vaporized wet liquefied feed gas can be dried in ethnoastronomy column by contact with a solution of triethylene glycol.

This task is solved in that a method involving the use of the absorption column and the formation of recirculation paths, additionally includes the use of ethnoastronomy columns with integral condenser at the top of the column, which is used as a cooling agent, at least part of the cold exhaust steam from the absorption column, and a condenser at the top of the column produces irrigating fluid, the formation of the first recirculation circuit, in which the first is ulali, in which the second part of the irrigating fluid enters the absorption column; and forming a third loop recycling, which receive the fluid from the absorber comes into heat exchange with the purpose of cooling the gas supply absorber and enters atanother column.

Specified atanother column in the proposed method of increasing the recovery of propane from the gas supply may optionally include an integral device for contact dehydration.

In the capacitor in accordance with the proposed method can be further used propane cooling agent.

In the proposed method, the output of the propane from the gas supply may include the extraction of gas supply to 99 mol%. propane.

Various objects, features, modifications, and advantages of the present invention will become more clear in the subsequent detailed description of the preferred modifications of the invention, accompanied by drawings.

The drawing shows a diagram of the installation of improved extraction of propane in accordance with the subject invention.

To see the setup diagram 100 of an improved extraction of propane has an absorption column 110 and the second column 120. In absorbs is, is in the lower part of the obtained liquid 114. Cool exhaust steam 116 is used as a cooling agent in the integral capacitor 130 on the top of the column, which produces irrigating condensate 140. The first part 142 irrigating condensate 140 enters recycle back to the second column, while the second part 144 irrigating condensate 140 enters the absorption column 110. Treated produced fluid 170 is removed from the second column at the bottom. Entered at the discretion of the cooling unit 190 cools the refrigerant for integral capacitor 130 on top of the column.

In the gas separation element 180 enters the wet process gas 182, and comes out wet feed gas 184 in gaseous form and wet liquefied feed gas 186, which is fed to the second column (for example, ethnoastronomy column) at a point below an integral device 150 for contact dehydration.

In a preferred modification of the embodiment of the present invention the absorption column 110 is a conventional distillation column with one or more plates, nozzles or any reasonable combination. Consider the absorption column 110 have a capacity of about 600 MMscfd (mega mega to succat the gas flow of about 600 MMscfd. He limiting the subject invention, consider the absorption column can have upper and lower sections. The top section usually acts as a separator, in which the steam is separated from the corresponding liquid part, and in which the target pairs that are not absorbed in the lower section, together with a liquid separator in the upper part of the column. The lower section of the column usually acts as a Stripping column, which removed ethane or other gaseous target component.

However, it should be recognized that the process is also suitable various alternative absorption columns, and alternative absorption columns include designs that contain multiple sections, and the point of supply. Similarly, the performance of the absorber cannot be limited to a certain amount at a certain height and/or diameter. Therefore, appropriate alternative absorbers can have a capacity of between 400 and 600 MMscfd and above, or between 100 and 400 MMscfd and below. However, you should pay special attention to the fact that the absorption column is a structure that is separate from the second column (for example, ethnoastronomy columns). The term "individual structure", as used hereinafter, means that absorptio the cell extraction process of propane can be carried out in the "cold" section of the column (i.e., section at a temperature between -50 and -59oC) and "warm" column section (i.e. section at a temperature higher than about -50oC). You should pay particular attention to the fact that the division in an improved process of extracting propane in cold and warm sections of the column results in a significant reduction of material costs, since the only cold part requires the use of stainless steel, and atanother column or the second column can be made of low carbon steel.

Next, suppose that the supply gas 112 (infra) enters into suitable absorbers and that of the absorber then get out fluid 114, normally - liquid propane, or other target compound, which at least to some extent contains impurities. To increase the recovery of propane or other target compounds is believed that the resulting liquid 114 is heated (e.g., heat exchanger) to translate the received fluid in the gaseous state, and that the resulting liquid into a gaseous state and then injected into the second column (for example, in ethnoastronomy column). With regard to the insertion point, then I think suitable for this variety of point, however, it is preferable that the first part of irrigating condensate enters the second column.

As for the second column, it is preferable that the second column is included atanother column. In the art there are many known types of columns for distillation, ethane, and all known atanother columns are suitable for use in connection with the methodology presented here. For example, suitable atanother column may include a conventional distillation column with one or more plates, nozzles or any reasonable combination.

Consider atanother columns 120 each have a capacity of about 100 MMscfd at an altitude of approximately 100 feet (30 m) and a diameter of about 10 feet (3 m) that allows you to skip the gas flow of about 100 MMscfd. Further suppose that atanother columns can have upper and lower sections, the upper section normally acts as a separator, in which the steam is separated from the corresponding liquid part and in which the target pairs that are not absorbed in the lower section, together with a liquid separator in the upper section of the column. The lower section usually acts as a Stripping column, which removes ethane or other undesirable gaseous component. Next, you should take into account that appropriate atanother columns also my fluid. Consider the second column produce purified received liquid and usually include the outlet for treated produced fluid in the lower part of the column. Consider peeled receive fluids include, for example, liquefied gas, comprising primarily propane and higher hydrocarbons. The term "higher hydrocarbons" as used hereinafter, refers to volatile (at room temperature) hydrocarbons having from 4 to 6 carbon atoms.

However, more preferably, Sanathana column 120 has been connected with the liquid stream from the condenser 130, preferably integral capacitor on the top of the column. The term "integral" is a device used hereinafter, means that the device is located inside the column. Further suppose that the capacitor 130 apply a cooling agent, and, in particular, believe that the cooling agent includes cool exhaust steam 116 of the absorber, propane or any suitable combination. However, it should also take into account that, while the preferred capacitors are an integral capacitors on the top of the column, alternative capacitors can also be installed outside ethnoastronomy columns, the irrigating water from ethnoastronomy columns.

Consider the capacitor 130 produces irrigating condensate 140 of the exhaust fumes ethnoastronomy columns, and this irrigating condensate 140 share, at least on the first portion 142 and second portion 144. Usually prefer the first part 142 irrigating condensate received by the recycling in the lower part ethnoastronomy column and to the second part 144 irrigating condensate received in the upper part of the absorption column, additionally increasing, thus, the degree of extraction of propane. Although the ratio between the first and second parts do not necessarily have to be fixed, the typical relationship between the first portion to the second portion are usually between 0.5 and 2. However, we can consider the alternative ratios, such as between 2 and 3 and above or between 0.2 and 0.5 and below. Thus, at least part of irrigating condensate can be used to (a) increase the total extraction of propane and (b) lowering the energy consumption required to obtain condensation by extracting part of the cold exhaust steam from the showers condensate to get this condensate. In the art there are known various capacitors, and all the known capacitors are suitable for primeminster serdechnikov type (core type condenser) or disc-frame (plate and frame type condenser) condenser, associated liquid flow ethnoastronomy column (preferably an integral capacitor on the top of the column). In the alternative case, the capacitor can also apply a cooling agent, which is cooled using turbomachines.

Next, you should pay attention to the fact that the working pressure between ethnoastronomy column and the absorption column such that atanother column operates at a slightly higher pressure than the absorption column. Therefore, I believe that during the flow of the second portion irrigation of condensate in the absorption column to apply a pump or other equipment not normally needed, which also helps to reduce downtime maintenance on rotating parts.

In alternative embodiments of the present invention believe that the second column further includes an integral device for contact dehydration (integral water removal contactor), in which, preferably, is used as the dehydrating agent is triethylene glycol. In the art there are known various devices for contact dehydration, and believe that they are all suitable for use in the present invention. For example, a suitable osogo device for contact dehydration inside the second columns are particularly preferably to an integral device for contact dehydration was found between levels, where wet liquefied gas supply and receive fluid in gaseous form are placed in the second column. In another example, if atanother the convoy arrives wet liquefied feed gas and atanother column has an integral device for contact dehydration, then I think at least part of the wet supply of liquefied gas is evaporated in ethnoastronomy column using reboiler, and then dried in ethnoastronomy column by contact with a solution of triethylene glycol.

Wet liquefied gas supply 186 is usually obtained using the gas-separating element 180, which receives the wet process gas 182. Gas-separating element is preferably vapor-liquid separator, which generates a wet feed gas in gaseous form. Particularly preferably, the unification into one device for contact dewatering allows direct supply of wet liquefied feed gas in the second column. The term "wet", as used hereinafter, means "containing water, and water etc the ante embodiment of the present invention, the installation may include a gas separating element, which receives the wet process gas, which get wet feed gas in a gaseous form and wet liquefied feed gas. Wet liquefied feed gas enters atanother column, and atanother column includes an integral device for contact dehydration and additionally atanother column includes an integral capacitor on the top of the column, which is formed by irrigating the condensate, the first of which came recycling in ethnoastronomy column, and the second part in the absorption column. You should pay particular attention to the fact that the advantage of this configuration is that the processing is possible as wet feed gas in a gaseous state, and wet liquefied feed gas in a single process, while the known methods used previously in the art, required a separate treatment of the wet feed gas in a gaseous form and humid supply of liquefied gas in two different processes.

As for the gas-separating element for the supply of gas, preferably a gas separating element for the feed gas consisted of a vapor-liquid separator; however, alternative R is parator. Consider wet process gas, in particular, includes a pair of light hydrocarbons and liquid hydrocarbons and water. Therefore, the wet feed gas in a gaseous form and wet liquefied feed gas include wet gaseous light hydrocarbons and wet liquid heavy hydrocarbons and water. As for ethnoastronomy columns, an integral device for contact dehydration, an integral capacitor on the top of the column and the irrigation of condensate, it also applies reasoning outlined above.

In another aspect of the invention, a method for increasing the degree of extraction of propane from the gas supply, which includes a single operation, which is used absorption column and ethnoastronomy column, and atanother column has a condenser at the top of the column, which utilizes at least part of the cold exhaust steam from the absorption column as a cooling agent, and the capacitor on the top of the column produces irrigating fluid. On the advanced operations form the first recirculation circuit, in which the first part of the irrigating fluid is supplied by recycling in ethnoastronomy column, and on the other operations form the WTO is C, on the next operation to form the third loop recycling, which receive the fluid from the absorber comes into heat exchange with the purpose of cooling the gas supply absorber and enters atanother column. Note that when using this method of propane is extracted from the supply gas absorber, and the recovery of propane from the gas supply reaches 99 mol%. propane from the gas supply, the supply gas is usually wet process gas.

So, here private options described embodiment of the invention and their use to extract propane with high yield. However, for many skilled workers in the art should be obvious that there is much more variants of embodiment of the invention than that described above, which are within the essence and scope of the present invention. The object of the invention is thus not limited by the bounds of the main provisions of the attached claims. In addition, in the interpretation and description and the claims, all terms should be considered in the most broadest sense according to the context. In particular, the terms "includes" and "including" should rassmatrivatbsya elements, components or operations can take place or can be applied, or applied in combination with others, is not particularly specified elements, components or operations.

Claims

1. Installations for the extraction of propane from a feed gas, comprising: an absorption column that receives the gas feeding the absorber and which generates a cold first exhaust steam and receive the liquid, a heater that heats at least a portion of the received fluid to generate the received fluid in gaseous form, the second column, which receives at least a portion of the received fluid in the gaseous state and which generates a second exhaust steam, and the second column is additionally connected liquid stream from the condenser, which forms irrigating the condensate, while the capacitor uses at least the cold part of the first exhaust steam as a cooling agent, and the first part of irrigating condensate is supplied by recycling the second column, and the second part irrigating condensate enters the absorption column.

2. Installation under item 1, in which the second column includes atanother column.

3. Installation according to p. the th as a cooling agent in the condenser used propane.

5. Installation under item 2, in which the second column further includes an integral device for contact dehydration.

6. Installation under item 5, in which atanother column additionally comes wet liquefied feed gas.

7. Installation under item 5, in which as a dehydrating agent in an integral device for contact dewatering applied triethylene glycol.

8. Installation under item 2, in which the second column generates a treated produced fluid.

9. Installation under item 8, in which the treated produced fluid mainly consists of propane and higher hydrocarbons.

10. Installation under item 1, in which the capacitor is additionally supplied with a cooling agent from turbomachines.

11. Installation under item 1, in which as a cooling agent in the condenser, at least partially applied propane.

12. Installation under item 2, in which the absorption column is made of stainless steel, and atanother column made of low carbon steel.

13. Installations for the extraction of propane from a feed gas, comprising: a gas separating element for the supply of gas, which enters the wet process gas and the cat is Olonne, which goes wet liquefied feed gas, and atanother column includes an integral device for contact dehydration and atanother column further includes an integral capacitor on the top of the column, which produces irrigating the condensate, the first of which came recycling in ethnoastronomy column, and the second part enters the absorption column.

14. Installation under item 13, in which the gas separation element for supplying gas includes a gas-liquid separator.

15. Installation under item 13, in which at least part of the wet supply of liquefied gas is evaporated in ethnoastronomy column using reboiler.

16. Installation under item 15, in which at least part of the vaporized wet liquefied feed gas is dried in ethnoastronomy column by contact with a solution of triethylene glycol.

17. Method of increasing the recovery of propane from a feed gas, comprising: applying an absorption column and ethnoastronomy columns with integral condenser at the top of the column, which is used as a cooling agent, at least part of the cold exhaust steam from the absorption column, and a condenser on the news irrigating fluid is supplied by recycling in ethnoastronomy column, the formation of the second recirculation circuit, in which the second part of the irrigating fluid enters the absorption column, and forming a third loop recycling, which receive the fluid from the absorber comes into heat exchange with the purpose of cooling the gas supply absorber and enters atanother column.

18. The method according to p. 17, in which atanother column further includes an integral device for contact dehydration.

19. The method according to p. 17, in which the capacitor is additionally applied propane cooling agent.

20. The method according to p. 17, in which the output of the propane from the gas supply includes extraction from the feed gas to 99 mol.% propane.

 

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