Method of producing acetylene

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing acetylene through partial oxidation, splitting in an electric arc or pyrolysis of hydrocarbons. The reaction stream containing the obtained acetylene and soot is directed into a compressor, characterised by that the compressor used is a screw compressor, where liquid which absorbs a large amount of soot contained in the reaction stream is injected into the compressor. If water is injected, content of soot in the water coming out of the compressor is between 0.05 and 5 wt % and if other liquids are injected, the viscosity of the suspension must be comparable with the viscosity of the soot suspension in water.

EFFECT: use of the method enables to use the screw compressor for long periods without preliminary separation of soot.

15 cl, 1 dwg, 1 ex

 

The present invention relates to an improved method of producing acetylene by partial oxidation, cleavage in an electric arc or by the pyrolysis of hydrocarbons, and the reaction stream containing obtained acetylene and soot, is sent to the compressor.

Industrial production of acetylene is carried out, in particular, developed by BASF method based on partial oxidation of hydrocarbons (preferably natural gas) with oxygen. This method is described, for example, in U.S. patent US 5 824 834 and encyclopedia Ullman ("Ullmann''s Encyclopedia of Industrial Chemistry", 6th edition, 2000, Electronic Release, section 4.2.1).

Both the original product (hydrocarbon and oxygen) is first subjected to preliminary heating at a temperature in case of using natural gas is from about 500 to 650°C, mix and then turn in the combustion chamber of the flame, which stabilize the so-called burner unit. Pre-heating and mixing of primary products carried out with the aim of increasing the yield of acetylene.

Fiery reaction taking place at temperatures above 1500°C, sharply cut implemented in a few milliseconds by the injection of water, it is extremely rapid cooling (quenching) of the flame to about 90°C, leading to the termination of the radical chain reaction. Thus PR is tatramat destruction thermodynamically unstable intermediate product in the formation of acetylene. The result indicated a fiery reaction is a so-called gas splitting, which is a mixture of acetylene, the crude synthesis gas (mainly hydrogen and carbon monoxide), water vapor and by-products. One of these side products is carbon black. For condensation of mostly water vapor and a corresponding reduction of the quantity of gas to be compressed gas cleavage before compression is typically cooled to a temperature in the approximate range from 30 to 50°C.

Formed as a by-product carbon black is difficult to implement subsequent technological operations, and therefore to increase the efficiency of the method tend to separate it from the gas cleavage.

Soot is formed in the flame during the partial oxidation of hydrocarbons. Because it is formed in the gas phase, we are talking about extremely small particles whose size is typically less than 1 μm. The dependence of the amount of soot formed from the mode of operation of the reactor is described in U.S. patent US-5824834. A large part of carbon black precipitated in the system water quenching and sequentially attached to the cooling column. However, the soot subject to compression of the gas splitting remains significant in the case of the method of BASF is usually from about 100 to 1000 mg/nm3 and when using other methods of obtaining acetylene can be much higher. To avoid damage to the compressor used to compress gas cleavage, according to the prior art gas before compression exercised by the deposition of soot, and its residual content in the purified gas splitting is less than 20 mg/nm3. For the deposition of carbon black can be used, for example, wet electrostatic precipitators.

For gas compression splitting after separation of the contained carbon black and cooling systems typically use screw compressors manufactured, for example, firms GE Oil and Gas, Inc. (3300 Medaust Drive, Oshkosh, WI 54902, USA), MAN Turbomaschinen AG (46145 Oberhausen, Germany) and Kobe Steel, LTD., Compressor division, 9-12, Kita-shinagawa 5-chrome, Shinagawa-ku (Tokyo, 141-8688, Japan). Similar done with high precision, expensive machines are preferably used because they are suitable for the compression of gases, with the tendency to the formation of polymer deposits. However, in order to cool such screw compressors in operation add a small amount of water, however, in the compression process in the compressor usually complete evaporation of the added water, therefore, the compressor runs dry.

Since carbon black has a very high dispersion, its allocation is a very difficult task which the Oh is associated with large capital costs and significant technological costs. In addition, commonly used wet electrostatic precipitators, particularly in the deposition of acetylene black, constantly determine technological downtime. Outages are often caused by breakage of corona wires, due to the presence in Gaza cleavage of organic acids, and the formation of deposits, which contributes to poor wetting of the carbon black water.

Based on the foregoing, the present invention was used to find an improved method of producing acetylene, devoid of the above disadvantages and which allows to obtain acetylene with high production readiness for extended operational periods in accordance with the effective and simple technology.

The specified task according to the invention solved through a method for producing acetylene by partial oxidation, cleavage in an electric arc or by the pyrolysis of hydrocarbons, and material flow, obtained containing acetylene and soot, is sent to the compressor, wherein the compressor inject the liquid, which absorbs a large part contained in the material flow of soot.

It has been unexpectedly discovered that by preferably used as the compressor screw compressors of gas splitting is possible to allocate a significant amount of soot is the case, if the input to the compressor to inject as much water to compressor liquid was water, in which the dispersed precipitated soot. Therefore, according to the invention the amount of injected water is determined by the sedimentation of solids, and not cooling gas. Thus, it is possible preferably to abandon intended for soot deposition apparatus (usually precipitator) and according to the invention to direct the gas flow splitting directly in the screw compressor. Between the reactor and the compressor can perform additional technological operations, if it is not hindered by the presence of soot. The gas flow splitting before compression and simultaneous deposition of carbon black is preferably cooled in an additional column that allows for the condensation of water vapor to reduce the volumetric flow of gas, subject to the compressor for compression and to reduce its temperature at the inlet to the compressor. The exclusion device for the deposition of soot (usually precipitator) can significantly reduce the costs of new investment and significantly reduce capital costs. In addition, increases the production readiness of all devices, because there is no need of operation are subject to frequent breakage of electrostatic precipitators and increases the efficiency of the total produced in the manufacturing process.

This implementation method is not accepted by specialists in the calculation, since we are talking about the use of extremely expensive, made with high precision screw compressors. For example, prevailing in the present case, the gas flows from one side, you must use the screws to the large size, and on the other hand, despite the significant size must be ensured ongoing compliance with the minimum distance between rotating at extremely high speed screws, which is in the order of magnitude is less than1/100mm In the processing of such expensive compressors coming from cooling columns of gas flow splitting with high solids content ought to fear of a breakdown of these machines. However, injected in excess liquid, preferably water, unexpectedly allows you to operate the compressor during long working periods.

Proposed in the invention, the deposition of soot particularly successful, trouble-free and long working periods can be implemented if the soot coming out of the screw compressor in a liquid state (excluding water vapor) water is in the range from 0.05 to 5 wt. -%, preferably between 0.1 and 1.5 wt. -%, particularly preferably from 0.15 to 0.8% by weight of the. Higher content of carbon black should be avoided: in this case, due to very small particle sizes of soot can cause excessive increase in the viscosity of the corresponding aqueous slurry. Lower soot levels may be due to the addition of water or less strong cooling gas saturated with water vapor cleavage. The above limits determine, first, the minimum flow to be injected at the inlet to the compressor of the water, and, secondly, the maximum soot content in the injected water. The deposition of soot due to the extremely intensive mixing and interaction (ultimately, the relative speed of interaction) contained in the gas splitting of finely dispersed particles of carbon black with water, which plays a decisive role when using other deposition devices, such as a Venturi scrubber.

In the preferred embodiment proposed in the invention method for reduction of consumption of water requires the presence of the circuit. Consequently, the process water contains carbon black. Process water can be directed, for example, in the attached compressor after cooling column. To limit soot in the circuit of water above and within selected from ghazarossian soot should withdraw from the process. Soot can withdraw from the process, for example in the form of a suspension in water (process water).

Required to reasonably complete the deposition of soot compression gas splitting in the compressor is at least 1:2, preferably at least 1:3.

In another preferred embodiment of the proposed invention in the method of operation of the screw compressor instead of water you can inject the oil. The oil can also cause proposed in the invention, the deposition of soot. Unlike water, the oil can absorb approximately not more than 20% of the mass. carbon black. The compressor usually operate with a significant excess of injected oil, which means there is no problem of evaporation.

According to the invention other suitable liquids except water and oil are, for example, N-organic, methanol, acetone, gasoline, benzene or dimethylformamide. Preferably the use of substances already used in technologies for the production of acetylene, different from the way BASF, i.e., N-organic. The maximum soot coming out of the compressor fluid depends on the properties of the substance concerned. Ultimately, the viscosity of the corresponding suspension should be comparable with the viscosity of the above suspension of carbon black in water.

In the process of gas compression races is alinia preferably is practically complete precipitation of soot. Using offer in the invention method, it is possible to provide a residual soot coming out of the compressor gas flow not to exceed 20 mg/nm3and depending on the variant of the method can be achieved much lower values of residual soot. The degree of deposition of soot proposed in the invention method does not differ from the degree of deposition by electrostatic precipitators. In some cases remaining in the gas cleavage traces of soot absorbed by the solvent (N-methyl-pyrrolidone), used for the subsequent separation of gas cleavage. Because due to the formation of the polymer solvent is subject to continuous or at least regular ongoing regeneration, production disruptions due to the presence of traces of soot, no.

For long-term trouble-free operation of the compressor, in particular in the preferred embodiment of the method, mounted to the compressor on the suction line mufflers and mesh strainer should always be kept in moist condition, which prevents the formation of deposits of soot. For implementations of commonly performed operations to remove soot deposits should interrupt the production of acetylene (in the case of odopod is cnyh plants) or to limit (in the case of installations with multiple threads).

Proposed in the invention method is applicable for closed (according to the US patent US 5824834)and open (according to the above-cited encyclopedia Ullman) system water quenching. The method can also be used in the implementation of other well-known technological processes of production of acetylene, for example the processes described in the encyclopedia Ullman.

Proposed in the invention method provides an economical obtain acetylene. Soot formed as a by-product of obtaining acetylene, precipitated technologically simple method associated with low cost, and a process for production of acetylene can be carried out during the long production periods. In addition, while the preferred use of water as you add the liquid it is possible to achieve advantages consisting in no need of introduction into the production process more foreign components.

Example

In encyclopedia Ullman describes the method of BASF's water-quenching. In U.S. patent US 05824834 work mode setup changed so that made possible the recycling of process water in a closed system, and therefore was prevented from contact with hazardous substances process water from the ATM the sphere.

The drawing shows one of the options proposed in the invention method. Used as starting substances of natural gas (1) and oxygen (2) pre-heated humidified heaters (3). Then the original substances are mixed in the mixing zone (4) and in the combustion chamber (5) implement their interaction in accordance with a fiery reaction. The flame is cooled rapidly (quenched) performed below the combustion chamber by the injection process water (6). Saturated steam gas cleavage (7) (material stream containing acetylene and soot) with temperature, roughly corresponding to its maximum temperature after quenching, is fed into the cooling column (8). In column (8) carry out the cooling gas splitting chilled process water (9), which is accompanied by condensation of mostly water vapor. Torch (10) is used for operations start-up and shutdown. Chilled to about 40°With gas cleavage (11) (45000 nm3/h in terms of dry gas with soot 200 mg/nm3squeeze through a two-stage screw compressor (12), increasing the pressure from 1.1 to 4.2 bar, and then up to 11 bar (absolute pressure), and the compression is accompanied by the deposition of soot. At each stage of the compressor inject 7.5 m3/h process water (13), the soda is containing 0.15% of the mass. carbon black. To isolate the internal volume of the compressor from the external atmosphere along with the nitrogen use demineralized water (14) as a so-called packing liquid, resulting in the circulation loop process water enters 4 m3/h of additional water. The temperature of the gas splitting the output from the first stage (15) of the compressor is 85°C, the content of carbon black in water is 0.22% of the mass. Gas splitting after each stage of compression is cooled to 40°C in the respective cooling columns (17) with chilled process water (16). Compressed gas cleavage (18) is separated into constituent components, for example, as described in the encyclopedia Ullman. Condensed during compression and subsequent cooling water, and added to the circuit demineralized water is removed from the system together with information contained in these soot in the form of a stream (19). The soot circuit water circulation is established in accordance with the number entered in the circuit water (condensed water vapor + demineralized water) and the amount of soot, which correspond to the quantities displayed in the form of a suspension of carbon black in water.

In accordance with another example implementation of the present invention in the way of starting strainers in front of the entrance on both stages of the compress the ora and after the mufflers are constantly assembled condition. Strainers prevent possible compressor damage due to ingress of foreign bodies, such as washers used in the Assembly and maintenance of the compressor. To prevent the formation of soot deposits starting filter at the input to the first stage compressor washed with 2 m3/h of water. For this you can use the standard one-component polnocvetnye nozzle operated with a pre-pressure of 5 bar. The opening angle and the position of the starting mesh filter is chosen so that to provide the most uniform and complete wetting. It should be noted in some cases, the high speed gas flow splitting. Without injection of water inrush filter had to be cleaned every three months, for which it was necessary to stop the process of production of acetylene on a single-threaded installations and limit on installations with multiple threads. In accordance with this example, the mesh filter of the second stage compressor is not needed to keep moist. Therefore, almost complete precipitation of soot is already on the first level.

1. A method of producing acetylene by partial oxidation, cleavage in an electric arc or by the pyrolysis of hydrocarbons, and the reaction stream containing p is obtained acetylene and soot, sent to the compressor, characterized in that as a compressor used screw compressor, and the compressor is injected fluid, absorbing a large part contained in the reaction stream of soot, and in the case of injection water soot coming out of the compressor water is from 0.05 to 5 wt.%, and in the case of other liquids, the viscosity of the suspension should be comparable with the viscosity of the suspension of carbon black in water.

2. The method according to claim 1, characterized in that the liquid injected water.

3. The method according to claim 1, characterized in that a liquid spray oil.

4. The method according to claim 1, characterized in that a liquid spray solvent.

5. The method according to claim 4, characterized in that the solvent optionally together with other solvents after compression of the reaction stream can be used for separation.

6. The method according to claim 1, characterized in that the compressor uses one or more single-stage or multi-stage screw compressors.

7. The method according to claim 1, characterized in that the compression ratio is at least 1:2.

8. The method according to claim 1, characterized in that the compression ratio is at least 1:3.

9. The method according to claim 1, characterized in that the soot coming out of the compressor water is from 0.1 to 1.5 wt.%.

10. The way pop, characterized in that the soot coming out of the compressor water is from 0.15 to 0.8 wt.%.

11. The method according to one of claims 1 to 10, characterized in that it is free from soot liquid according to claim 2 to 4 use the compressor as a packing fluid isolation from the external environment.

12. The method according to one of claims 1 to 10, characterized in that the formation of deposits of soot on mounted to the compressor mesh suction filter and/or silencer suction prevent continuous or periodic moistening fluid according to claim 2 to 4.

13. The method according to claim 11, characterized in that the formation of deposits of soot on mounted to the compressor mesh suction filter and/or silencer suction prevent continuous or periodic moistening fluid according to claim 2 to 4.

14. The method according to item 12, characterized in that the liquid is continuously sprayed on the mesh filter suction through the nozzles full cone spray.

15. The method according to item 13, wherein the formation of deposits of soot on mounted to the compressor mesh suction filter and/or silencer suction prevent continuous or periodic moistening fluid according to claim 2 to 4.



 

Same patents:

FIELD: petrochemical processes.

SUBSTANCE: process of producing benzene, ethylene, and synthesis gas from methane comprises following stages: (i) supplying into reactor initial gas containing methane and carbon dioxide; (ii) oxidation of methane in reactor under specific reaction conditions using first catalytic material and/or additional oxidant; and (iii) removal from reactor of gas stream formed containing benzene, ethylene, and synthesis gas, inside wall of reactor having been treated with first catalytic material.

EFFECT: increased conversion of methane and selectivity regarding benzene at reduced accumulation of coke fragments.

20 cl, 9 tbl, 9 ex

The invention relates to the technology of basic organic synthesis, in particular the methods of chemical processing of natural gas to produce hydrocarbons and their derivatives, such as ethylene, acetylene, benzene, naphthalene, perchlorethylene, carbon tetrachloride, etc

FIELD: chemistry.

SUBSTANCE: invention relates to a method for continuous use of apparatus for producing acetylene from hydrocarbons which are alkanes having chain length of up to C10 via partial oxidation to obtain a mixture of reaction gas, which is directed through one or more compressors, wherein the pressure of the mixture of reaction gas on the suction side of the compression zone is regulated using a regulating device in a given range, characterised by that a predicting regulating device is also used, which works at a higher level which supports this model, where the said predicting regulating device is a Feed-Forward regulator, which reacts to sudden change in mass flow of the mixture of reaction gas greater than 5%.

EFFECT: use of the present method ensures continuous operation of apparatus for producing acetylene in case of high processed mass flow.

14 cl, 1 dwg

The invention relates to the field of chemistry and relates to device direct thermal conversion of methane to hydrocarbons of higher molecular weight containing installed in a sealed metal casing elongated cylindrical shape coaxially with its axis of symmetry reactor made of refractory material, the working volume which includes a pre-heating zone, mainly due to convective heat transfer from the products of the reaction zone subsequent high-temperature heating to a temperature of methane conversion, the soaking zone of the heated mixture and the quench zone of the reaction products, the heater is electrically connected with a power source located outside of the reactor, devices for feeding the reaction mixture and release of the reaction products, devices for monitoring and controlling the heating temperature and pressure

The invention relates to the field of processing products of oil wells, gas and gas condensate fields and can be used for processing natural and produced gases or their components in more severe, predominantly liquid hydrocarbons, is stable under normal conditions

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing acetylene and synthetic gas via thermal partial oxidation of hydrocarbons which are gaseous at temperatures used for preheating, in a reactor which is fitted with a burner with through holes, characterised by that the starting substances to be converted are quickly and completely mixed only directly in front of the flame reaction zone in through holes of the burner, where in the mixing zone within the through holes the average flow rate is higher than the propagation speed of the flame under the existing reaction conditions. The invention also relates to a device for realising the said method.

EFFECT: possibility of avoiding preliminary and reverse inflammations.

9 cl, 3 ex, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a method for continuous use of apparatus for producing acetylene from hydrocarbons which are alkanes having chain length of up to C10 via partial oxidation to obtain a mixture of reaction gas, which is directed through one or more compressors, wherein the pressure of the mixture of reaction gas on the suction side of the compression zone is regulated using a regulating device in a given range, characterised by that a predicting regulating device is also used, which works at a higher level which supports this model, where the said predicting regulating device is a Feed-Forward regulator, which reacts to sudden change in mass flow of the mixture of reaction gas greater than 5%.

EFFECT: use of the present method ensures continuous operation of apparatus for producing acetylene in case of high processed mass flow.

14 cl, 1 dwg

The invention relates to a method for production of acetylene and synthesis gas

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing acetylene and synthetic gas via thermal partial oxidation of hydrocarbons which are gaseous at temperatures used for preheating, in a reactor which is fitted with a burner with through holes, characterised by that the starting substances to be converted are quickly and completely mixed only directly in front of the flame reaction zone in through holes of the burner, where in the mixing zone within the through holes the average flow rate is higher than the propagation speed of the flame under the existing reaction conditions. The invention also relates to a device for realising the said method.

EFFECT: possibility of avoiding preliminary and reverse inflammations.

9 cl, 3 ex, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a method for continuous use of apparatus for producing acetylene from hydrocarbons which are alkanes having chain length of up to C10 via partial oxidation to obtain a mixture of reaction gas, which is directed through one or more compressors, wherein the pressure of the mixture of reaction gas on the suction side of the compression zone is regulated using a regulating device in a given range, characterised by that a predicting regulating device is also used, which works at a higher level which supports this model, where the said predicting regulating device is a Feed-Forward regulator, which reacts to sudden change in mass flow of the mixture of reaction gas greater than 5%.

EFFECT: use of the present method ensures continuous operation of apparatus for producing acetylene in case of high processed mass flow.

14 cl, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing acetylene through oxidative pyrolysis of methane in the presence of oxygen and a catalyst, characterised by that the catalyst is heated to 700-1200°C by passing electrical current through it. The catalyst used is a fechral alloy which is thermally treated on air at temperature 900-1100°C. The ratio of methane to oxygen is varied in the range of 5:1-15:1.

EFFECT: high output and selectivity of the process.

2 cl, 17 ex, 1 tbl, 1 dwg

FIELD: chemistry.

SUBSTANCE: method of processing carbon-carbonate mineral involves burning limestone in a reactor, obtaining calcium oxide, production of calcium carbide by reacting part of calcium oxide obtained from burning limestone with carbon, bringing part of the obtained calcium carbide into contact with water, obtaining acetylene and caustic lime, bringing gaseous wastes from burning limestone into contact with water to obtain carbonic acid. Limestone is burnt using heat obtained from burning part of the volume of acetylene, obtained from part of the volume of calcium carbide. At least part of the obtained acetylene is used in synthesis of ethanol and/or dichloroethane and/or ethyleneglycol and/or acetone. During synthesis of ethanol and/or dichloroethane, acetylene is reacted with hydrogen in the presence of palladium as catalyst, after which at least part of synthesised C2H4 material is reacted with water vapour, obtaining ethanol, and/or reacted with chlorine, obtaining dichloroethane. Also at least part of the obtained acetylene is subjected to hydrolysis, obtaining ethyleneglycol. Also during synthesis of acetone, part of the obtained acetylene is reacted with water vapour, where the hydrogen obtained is used in said synthesis of ethanol and/or dichloroethane and/or burnt in the burning process. Carbon dioxide obtained from synthesis of acetone is used in the process of producing carbonic acid.

EFFECT: wide range of obtained finished products and prevention of formation of industrial wastes.

4 cl, 1 ex, 1 dwg

FIELD: production processes.

SUBSTANCE: there proposed is the method of device cleaning from deposits formed as a result of purified N-methylpyrrolidone regeneration by N-methylpyrrolidone distillation from material flow of contaminated N-methylpyrrolidone. Contaminated N-methylpyrrolidone is formed according to the method of extractive separation of acetylene from reaction mixture of partial hydrocarbon oxidation after distillation of gaseous acetylene. Note that hot water is supplied to the device and mixed.

EFFECT: proposed method permits to exclude manual operation with solid substances, but at the same time regenerating significant part of purified contaminated N-methylpyrrolidone.

9 cl, 1 dwg, 2 ex

FIELD: inorganic compounds technologies.

SUBSTANCE: invention is directed to production of acetylene and lime through hydrolysis of calcium carbide. Hydrolysis solution is prepared from water/ethanol mixture containing at least 68 wt % ethanol. After hydrolysis, ethanol vapors are condensed to give anhydrous ethanol. Acetylene and lime are also obtained in anhydrous form.

EFFECT: enhanced process efficiency due to wastelessness of the process and possibility of using carbide dust and fines, improved safety of process, and improved quality of generated acetylene.

1 dwg, 2 ex

FIELD: chemical industry branches, possibly manufacture of calcium carbide, calcium oxide, acetylene, carbonic acid and slaked lime.

SUBSTANCE: coal-carbonate mineral raw material - lime is fired in reactor 1 with use of acetylene as high-temperature energy carrier. Lime produced in reactor 1 is fed to user and(or) to second reactor 2 and adding coke or coal with fraction size 20 -25 mm and with sulfur content less than 1% into reactor 2. Some part of acetylene further produced is also added to reactor 2. Ready calcium carbide is removed out of reactor 2 and it is fed to user and(or) to fourth reactor 4 where after contact with water acetylene and slaked lime are formed. Acetylene is fed through pipeline 15 to user and(or) to reactors 1 and 2. Ready slaked lime is fed to user. Gaseous products such as carbon dioxide from reactor 1 and carbon oxide from reactor 2 are fed to third reactor 3 where after contact with water carbonic acid is formed and fed to user as "dry ice" or in liquefied state.

EFFECT: possibility for producing wide assortment of commercial products in one waste-free cycle, elimination of environment contamination.

2 cl, 1 dwg

The invention relates to the processing of the products of oxidative pyrolysis gas metadatareader

The invention relates to the production of vinyl chloride

The invention relates to a plasma chemical processing of coal

FIELD: chemical industry branches, possibly manufacture of calcium carbide, calcium oxide, acetylene, carbonic acid and slaked lime.

SUBSTANCE: coal-carbonate mineral raw material - lime is fired in reactor 1 with use of acetylene as high-temperature energy carrier. Lime produced in reactor 1 is fed to user and(or) to second reactor 2 and adding coke or coal with fraction size 20 -25 mm and with sulfur content less than 1% into reactor 2. Some part of acetylene further produced is also added to reactor 2. Ready calcium carbide is removed out of reactor 2 and it is fed to user and(or) to fourth reactor 4 where after contact with water acetylene and slaked lime are formed. Acetylene is fed through pipeline 15 to user and(or) to reactors 1 and 2. Ready slaked lime is fed to user. Gaseous products such as carbon dioxide from reactor 1 and carbon oxide from reactor 2 are fed to third reactor 3 where after contact with water carbonic acid is formed and fed to user as "dry ice" or in liquefied state.

EFFECT: possibility for producing wide assortment of commercial products in one waste-free cycle, elimination of environment contamination.

2 cl, 1 dwg

FIELD: inorganic compounds technologies.

SUBSTANCE: invention is directed to production of acetylene and lime through hydrolysis of calcium carbide. Hydrolysis solution is prepared from water/ethanol mixture containing at least 68 wt % ethanol. After hydrolysis, ethanol vapors are condensed to give anhydrous ethanol. Acetylene and lime are also obtained in anhydrous form.

EFFECT: enhanced process efficiency due to wastelessness of the process and possibility of using carbide dust and fines, improved safety of process, and improved quality of generated acetylene.

1 dwg, 2 ex

FIELD: production processes.

SUBSTANCE: there proposed is the method of device cleaning from deposits formed as a result of purified N-methylpyrrolidone regeneration by N-methylpyrrolidone distillation from material flow of contaminated N-methylpyrrolidone. Contaminated N-methylpyrrolidone is formed according to the method of extractive separation of acetylene from reaction mixture of partial hydrocarbon oxidation after distillation of gaseous acetylene. Note that hot water is supplied to the device and mixed.

EFFECT: proposed method permits to exclude manual operation with solid substances, but at the same time regenerating significant part of purified contaminated N-methylpyrrolidone.

9 cl, 1 dwg, 2 ex

Up!