CN101921163A - Method for removing carbon black and high polymer in preparation of acetylene by cracking natural gas with plasma - Google Patents
Method for removing carbon black and high polymer in preparation of acetylene by cracking natural gas with plasma Download PDFInfo
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- CN101921163A CN101921163A CN 201010250769 CN201010250769A CN101921163A CN 101921163 A CN101921163 A CN 101921163A CN 201010250769 CN201010250769 CN 201010250769 CN 201010250769 A CN201010250769 A CN 201010250769A CN 101921163 A CN101921163 A CN 101921163A
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Abstract
The invention discloses a method for removing carbon black and high polymer in the preparation of acetylene by cracking natural gas with plasma. The method comprises the following steps: 1) the cracked gas from a gas generating process enters a hot water washing tower from a bottom charge end, performs the spray washing of hot water with the temperature of 60-130 DEG C and the absorption of porous packing and is discharged from a discharge end on the top of the hot water washing tower; 2) the gas leaving the hot water washing tower enters a single-stage electrostatic precipitator to perform single-stage electrostatic precipitation treatment; and 3) the treated gas enters a cold water washing tower from a bottom charge end, performs the spray cooling of water with the temperature of 20-40 DEG C and enters a gas holder for the post-treatment. By using the method, the carbon black and high polymer in the raw acetylene feed gas can be removed more thoroughly, the technological requirement of the preparation of acetylene by cracking natural gas with plasma can be satisfied; and the loss of acetylene can be reduced and the packing can be reused.
Description
Technical field
The present invention relates to a kind of method that removes carbon black and superpolymer, specifically is a kind of method that removes carbon black and superpolymer in the preparation of acetylene by cracking natural gas with plasma.
Background technology
Acetylene is a kind of important source material of organic chemistry industry, also is the high performance fuel with special purpose.Along with the lasting rising of oil on the world market and petroleum product price, the acetylene that uses Sweet natural gas to produce will become the substitute of petroleum product on a large scale.
The production method of acetylene mainly contains carbide acetylene method, hydrocarbon cracking method, directly produces acetylene method etc. by coal.The facility investment of tradition calcium carbide route is big, and the serious problems of repeated contamination are arranged repeatedly, is replaced by Sweet natural gas system acetylene technology already in developed country.At present, Chang Yong Sweet natural gas system acetylene technology comprises gas by partial oxidation of natural method and plasma pyrolysis method.The gas by partial oxidation of natural method is owing to there is oxygen to participate in reaction, thereby must increase complicated antiknock device, and makes and separate and purification costs improves, the increase cost.It is simple that Sweet natural gas plasma body legal system acetylene has technology, and reacted gas is easily separated, the raw material availability height, and reduced investment, characteristics such as cost is low, and production safety is reliable, and is pollution-free all are better than other acetylene preparation method at aspects such as Technological Economies.
Because methane gas at high temperature reacts, the meeting by-product is a certain amount of by the carbon black pellet of methane dehydrogenation generation and the superpolymer that is polymerized by the ethene that produces in the reaction process, acetylene etc. in the production process of acetylene.The carbon black that produces in the production process of acetylene has characteristics such as dispersity is big, density is light, particle is little, wetting ability difference, the existing technology that removes carbon black and superpolymer mainly contains filtration method, normal temperature WATER-WASHING METHOD and multistage electric precipitation method, filtration method generally applies to small-scale device, and big to the reactant gases resistance, removal effect is poor; The normal temperature WATER-WASHING METHOD is because same removal effect difference of characteristics such as carbon black wetting ability difference and energy consumption are higher; Multistage electric precipitation method can be removed to 10mg/Nm with the carbon black in the reactant gases
3Below, but shortcoming such as there is the flow process complexity in it, and plant investment height and energy consumption are big.The carbon black that is produced in the preparation of acetylene by cracking natural gas with plasma process and the content of superpolymer are usually greater than 30g/Nm
3, far above other acetylene production process, if below the content that is removed to processing requirement that the existing technical process of employing can not be effective, economic with it.
Summary of the invention
The objective of the invention is to overcome and remove the deficiency that carbon black and superpolymer method do not reach cracking legal system acetylene processing requirement in the prior art, a kind of method that removes carbon black and superpolymer in the preparation of acetylene by cracking natural gas with plasma is provided.This method can remove carbon black and the superpolymer in the thick acetylene unstripped gas more completely, reduces the loss and the production cost of acetylene simultaneously.
For achieving the above object, the technical solution adopted for the present invention to solve the technical problems is:
A kind of method that removes carbon black and superpolymer in the preparation of acetylene by cracking natural gas with plasma may further comprise the steps:
A, enter the hot wash tower by the bottom feed end, after heat water-spraying's washing of 60 ℃～130 ℃ of temperature and protruded packing adsorb, discharge from hot wash top of tower discharge end from the splitting gas of gas making operation;
B, the gas that goes out the hot wash tower enter the single-stage electric precipitator to carry out the single-stage electric precipitation and handles;
C, the gas after the single-stage electric precipitation is handled enter the cold water washing tower by the bottom feed end, go into gas holder and carry out subsequent disposal through the water spray cooling of 20 ℃～40 ℃ of temperature is laggard.
As optimal way, spray washing is 60 ℃～120 ℃ with the temperature of hot water in described steps A.
As optimal way, described protruded packing is zeolite, porous alumina, porous silicon carbide or molecular sieve.
Further preferred, described molecular sieve is 4A molecular sieve or 5A molecular sieve.
What adopt when the present invention washs carbon black is hot wash, and this and conventional cold water washing have very big difference.Adopt hot water to carry out the principle that detergent has been used alternating temperature absorption, strengthened the avidity between superpolymer and carbon black pellet and the filler, more help the absorption of superpolymer and carbon black pellet at filling surface.The carbon black pellet that produces owing to cracking process is a vesicular structure, and big adsorptive power is arranged, and therefore is adsorbed with many gases in carbon black pellet, and is feasible littler than water with the carbon black density under the hot wash, on can bubbling through the water column.Use hot wash can make that the speed of carbon black come-up is faster, be more conducive to adopt the buoyance lift method to remove carbon black.Acetylene gas solubleness in the higher water of temperature is littler simultaneously, more helps improving the yield of acetylene.
Hot wash tower of the present invention adopts protruded packing to adsorb, the plain metal filler that adopts with respect to traditional technology has characteristics such as porous, specific surface area are big, can improve the contact area of washing composition and gas effectively, improve detersive efficiency, and little to air resistance; Simultaneously, the porous surface of filler can adsorb polymkeric substance and the part carbon black pellet in the thick acetylene gas, Purge gas.The filler material is high temperature resistant, and the hardness height uses this kind filler can effectively reduce the number of processes of filler, the extension fixture cycle of operation, filler after the absorption can be handled by the method for high temperature incineration, and filler is reusable, and superpolymer and the carbon black pellet that adsorbs transformed into CO
2Reach water and be discharged into out-of-bounds, avoided environmental pollution.
Beneficial effect of the present invention is: can remove carbon black and superpolymer in the thick acetylene unstripped gas more completely, satisfy the processing requirement of preparation of acetylene by cracking natural gas with plasma; Reduced the loss of acetylene simultaneously, filler is reusable.
Description of drawings
The present invention will illustrate by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is a process flow sheet of the present invention;
Fig. 2 is the process flow sheet of prior art.
Mark among the figure: 1 hot wash tower, 2 electric precipitator, 3 washing towers, 4 sooty water house stewards, 5 cold water washing towers.
Embodiment
Disclosed all features in this specification sheets, or the step in disclosed all methods or the process except mutually exclusive feature and/or step, all can make up by any way.
Embodiment 1: as shown in Figure 1, a kind of method that removes carbon black and superpolymer in the preparation of acetylene by cracking natural gas with plasma may further comprise the steps:
A, from splitting gas (the carbon black pellet content 30g/Nm of gas making operation
3) enter hot wash tower 1 bottom feed end, after heat water-spraying's washing and protruded packing absorption, enter electric precipitator 2 feed ends through pipeline from hot wash tower 1 top discharge end;
B, the gas of (electric precipitation voltage is 50kV) enters washing tower 3 bottom feed ends through pipeline after electric precipitator 2 is handled, and (temperature is 40 ℃, and pressure is 1mH through water coolant
2O) enter the feed end of gas holder after spray is cooled to about 40 ℃.
Spray washing is 80 ℃ with the temperature of hot water in the described steps A, and pressure is 1.4mH
2O.Described protruded packing is a zeolite.Its treatment effect sees Table 1.
Embodiment 2: as shown in Figure 1, a kind of method that removes carbon black and superpolymer in the preparation of acetylene by cracking natural gas with plasma may further comprise the steps:
A, from splitting gas (the carbon black pellet content 50g/Nm of gas making operation
3) enter hot wash tower 1 bottom feed end, after heat water-spraying's washing and protruded packing absorption, enter electric precipitator 2 feed ends through pipeline from hot wash tower 1 top discharge end;
B, the gas of (electric precipitation voltage is 60kV) enters washing tower 3 bottom feed ends through pipeline after electric precipitator 2 is handled, and (temperature is 30 ℃, and pressure is 1mH through water coolant
2O) enter the feed end of gas holder after spray is cooled to about 40 ℃.
Spray washing is 100 ℃ with the temperature of hot water in the described steps A, and pressure is 1.4mH
2O.Described protruded packing is 4A molecular sieve or 5A molecular sieve.The hot wash tower is two, when the superpolymer of a filling adsorption wherein and carbon black pellet reach a certain amount of after, then switch to another and carry out adsorption operations.Its treatment effect sees Table 1.
Embodiment 3: as shown in Figure 1, a kind of method that removes carbon black and superpolymer in the preparation of acetylene by cracking natural gas with plasma may further comprise the steps:
A, from splitting gas (the carbon black pellet content 30～50g/Nm of gas making operation
3) enter hot wash tower 1 bottom feed end, after heat water-spraying's washing and protruded packing absorption, enter electric precipitator 2 feed ends through pipeline from hot wash tower 1 top discharge end;
B, the gas after electric precipitator 2 is handled enter washing tower 3 bottom feed ends through pipeline, and (temperature is 25 ℃, and pressure is 1mH through water coolant
2O) enter the feed end of gas holder after spray is cooled to about 35 ℃.
Spray washing is 90 ℃ with the temperature of hot water in the described steps A.Described protruded packing is porous alumina or porous silicon carbide.The hot wash tower can be one or more.
Comparative example: as shown in Figure 2, a kind of method that removes carbon black and superpolymer in the preparation of acetylene by cracking natural gas with plasma may further comprise the steps:
A, from splitting gas (the carbon black pellet content 40g/Nm of gas making operation
3) enter cold water washing tower 5 bottom feed ends, (temperature is 30 ℃, and pressure is 1.4mH through 30 ℃ of cold water
2O) behind the spray washing, enter electric precipitator 2 feed ends through pipeline from cold water washing tower 5 top discharge ends;
B, being 50kV through electric precipitator 2(electric precipitation voltage) gas after handling enters the feed end of gas holder through pipeline.Its treatment effect sees Table 2.
Table 1 the present invention removes the treatment effect table of carbon black and superpolymer
| Process conditions | Embodiment 1 | |
| The filler type: | Zeolite | Porous alumina |
| Carbon black and superpolymer content (g/Nm in the unstripped gas 3） | 30 | 50 |
| (1) hot wash | ? | ? |
| Washing back carbon black and superpolymer content (g/Nm 3） | 2 | 5 |
| (2) single-stage electric precipitation | ? | ? |
| Remove back carbon black and superpolymer content (g/Nm 3） | 0.01 | 0.03 |
| (3) cold water spray | ? | ? |
| Temperature (℃) | 40 | 30 |
| Pressure (mH 2O） | 1 | 1 |
Table 2 comparative example removes the treatment effect table of carbon black and superpolymer
| Process conditions | Comparative example |
| The filler type: | The plain metal filler |
| Carbon black and superpolymer content (g/Nm in the unstripped gas 3） | 40 |
| (1) cold water washing | ? |
| Washing back carbon black and superpolymer content (g/Nm 3） | 15 |
| (2) electric precipitation | ? |
| Remove back carbon black and superpolymer content (g/Nm 3） | 0.13 |
By above-mentioned two forms as seen, the present invention can remove carbon black pellet content to 0.01-0.03g/Nm
3, be better than the data of comparative example, and satisfy the processing requirement of preparation of acetylene by cracking natural gas with plasma fully.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (4)
1. method that removes carbon black and superpolymer in the preparation of acetylene by cracking natural gas with plasma is characterized in that may further comprise the steps:
A, enter the hot wash tower by the bottom feed end, after heat water-spraying's washing of 60 ℃～130 ℃ of temperature and protruded packing adsorb, discharge from hot wash top of tower discharge end from the splitting gas of gas making operation;
B, the gas that goes out the hot wash tower enter the single-stage electric precipitator to carry out the single-stage electric precipitation and handles;
C, the gas after the single-stage electric precipitation is handled enter the cold water washing tower by the bottom feed end, go into gas holder and carry out subsequent disposal through the water spray cooling of 20 ℃～40 ℃ of temperature is laggard.
2. the method that removes carbon black and superpolymer in the preparation of acetylene by cracking natural gas with plasma as claimed in claim 1, it is characterized in that: spray washing is 60 ℃～120 ℃ with the temperature of hot water in the described steps A.
3. as claim 1 or the 3 described methods that remove carbon black and superpolymer in the preparation of acetylene by cracking natural gas with plasma, it is characterized in that: described protruded packing is zeolite, porous alumina, porous silicon carbide or molecular sieve.
4. the method that removes carbon black and superpolymer in the preparation of acetylene by cracking natural gas with plasma as claimed in claim 4, it is characterized in that: described molecular sieve is 4A molecular sieve or 5A molecular sieve.
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| CN201010250769A CN101921163B (en) | 2010-08-11 | 2010-08-11 | Method for removing carbon black and high polymer in preparation of acetylene by cracking natural gas with plasma |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109294284A (en) * | 2018-11-12 | 2019-02-01 | 西南化工研究设计院有限公司 | A kind of method that the charcoal processing of plasma pyrolysis high methane gas is black |
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| US3674890A (en) * | 1970-03-04 | 1972-07-04 | Marathon Oil Co | Quenching process for pyrolytically cracked hydrocarbons |
| CN1030613C (en) * | 1990-09-27 | 1996-01-03 | 齐鲁石油化工公司第二化肥厂 | Recovering technology and its installation of vaporated carbon black from heavy oil |
| CN101734995A (en) * | 2008-11-06 | 2010-06-16 | 新疆天业（集团）有限公司 | Device and method for producing acetylene by hydrogen direct current arc plasma cracking coal |
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2010
- 2010-08-11 CN CN201010250769A patent/CN101921163B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3674890A (en) * | 1970-03-04 | 1972-07-04 | Marathon Oil Co | Quenching process for pyrolytically cracked hydrocarbons |
| CN1030613C (en) * | 1990-09-27 | 1996-01-03 | 齐鲁石油化工公司第二化肥厂 | Recovering technology and its installation of vaporated carbon black from heavy oil |
| CN101734995A (en) * | 2008-11-06 | 2010-06-16 | 新疆天业（集团）有限公司 | Device and method for producing acetylene by hydrogen direct current arc plasma cracking coal |
Non-Patent Citations (1)
| Title |
|---|
| 《天然气化工(C1化学与化工) 》 2002 罗义文; 漆继红等 等离子体裂解天然气制乙炔的技术和经济分析 第39-40页 1-4 第27卷, 第3期 2 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109294284A (en) * | 2018-11-12 | 2019-02-01 | 西南化工研究设计院有限公司 | A kind of method that the charcoal processing of plasma pyrolysis high methane gas is black |
| CN109294284B (en) * | 2018-11-12 | 2020-05-15 | 西南化工研究设计院有限公司 | Method for preparing carbon black by cracking methane-rich gas with plasma |
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Address after: No. 5 high tech Zone Gaopeng road in Chengdu city of Sichuan Province in 610041 Patentee after: Southwest Chemical Research & Design Institute Co., Ltd. Address before: No. 5 high tech Zone Gaopeng road in Chengdu city of Sichuan Province in 610041 Patentee before: Xinan Chemical Research & Design Inst. |