Separating preparation method of acetylene by absorbing pyrolysis gas with ionic liquid

An ionic liquid and pyrolysis gas technology, applied in absorption purification/separation, bulk chemical production, organic chemistry, etc., can solve the problems of difficult long-term recycling, high requirements for pyrolysis gas composition, inactivation, etc., and achieve solvent consumption. The effect of less, low saturated vapor pressure and good thermal stability

Active Publication Date: 2014-06-04
XINJIANG YUEHETAI CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, coordination metals are easy to react with water, sulfide, etc. and become inactivated, and have high requirements on the composition of cracked gas, making it difficult to recycle for a long time

Method used

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  • Separating preparation method of acetylene by absorbing pyrolysis gas with ionic liquid
  • Separating preparation method of acetylene by absorbing pyrolysis gas with ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] like figure 1 Shown, the present invention adopts ionic liquid absorption to separate the method for preparing acetylene from cracking gas, comprising:

[0042] (1) The cracked gas that has been cooled and dehydrated passes through the heavy component absorption tower T01 from bottom to top, and is countercurrently contacted with the heavy component absorbent added at the top of the tower. All tar, benzene, naphthalene and other heavy components with a boiling point of 80 ℃ ~ 300 ℃ and some high alkynes are absorbed to prevent the heavy components from coking and affecting the operation of the compressor. The heavy component absorption liquid obtained from the bottom of the heavy component absorption tower T01 can be re-added from the top of the heavy component absorption tower T01 for recycling, and can be recovered by rectification after saturation; or, the heavy component absorption liquid can be desorbed by heating and air stripping under ambient pressure , separat...

Embodiment 2

[0049] The pyrolysis gas produced by plasma pyrolysis of coal is used after dedusting, and the composition contains 13% (molar concentration, the same below) C 2 h 2 , 0.2%CH 4 , 0.9%C 2 h 4 , 9.5%CO, 0.8%N 2 , 73%H 2 , 1.0% homoyne and other small amounts of components above C3, the cracking gas flow rate is 1500Nm 3 / h.

[0050] like figure 1 And Example 1, N-methylpyrrolidone is used as the absorbent for heavy component absorption, and it is countercurrently contacted and absorbed with the cracked gas at 35°C and 0.1 MPa. The remaining cracked gas is pressurized to 0.65 MPa through a compressor, and cooled to At 30°C, a mixed solution of 98% (volume percentage) [Bmim][OAc] (1-butyl-3-methylimidazole acetate) and 2% (volume percentage) N-methylpyrrolidone (NMP) is Absorbent, the absorption liquid is heated to 80°C through the reboiler E01, desorbs the light component under decompression to 0.25MPa, then heats up to 110°C through the reboiler E02, desorbs under the de...

Embodiment 3

[0052] Cracked gas produced by cracking natural gas with high-frequency plasma, the composition is 11% (molar concentration, the same below) C 2 h 2 , 5.2%CH 4 , 0.4%C 2 h 4 , 8.2%CO, 72%H 2 , 1.8% homoyne and a small amount of other components, cracking gas flow 2200Nm 3 / h.

[0053] like figure 1 As in Example 1, N-methylpyrrolidone was used as the absorbent for the absorption of heavy components, and it was contacted and absorbed with cracked gas countercurrently at 35° C. and 0.1 MPa. The remaining cracked gas is compressed to 1.0MPa, cooled to 20°C, and the absorbent is ionic liquid [Bmim][MeHPO 3 ] (1-butyl-3-methylimidazobutyl phosphate), no organic solvent is added, the absorption liquid is heated to 80°C through the reboiler E01, decompressed to 0.25MPa to desorb the light components, and then passed through the reboiler E01 to desorb the light components Boiler E02 is heated to 110°C, decompressed to 0.1MPa and desorbed to obtain the acetylene component. The ...

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Abstract

The invention discloses a separating preparation method of acetylene by absorbing pyrolysis gas with ionic liquid, which comprises the following steps of: absorbing heavy components in pyrolysis gas by heavy component absorbent, sequentially absorbing the pyrolysis gas under high pressure by taking the ionic liquid or the mixed solution consisting of the ionic liquid and organic solvent as absorbent and adopting an absorption-desorption method, and carrying out split reduction and warming desorption on the preheated absorption liquid, to desorb the light components, the acetylene and the high alkyne, so as to obtain the high-purity acetylene in a separation way. The method has the characteristics of being high in separation efficiency, less in solvent energy consumption, safe, environment-friendly, suitable for the industrial production, and the like.

Description

technical field [0001] The invention relates to the field of separation and purification of acetylene in chemical engineering technology, in particular to a method for separating and preparing acetylene from pyrolysis gas by using ionic liquid absorption. Background technique [0002] Acetylene is an important basic raw material for organic chemical industry. It can be used as a raw material to synthesize polymer materials such as polyvinyl chloride, and can also be used as a raw material to synthesize fine chemicals such as butanediol, acetic acid, and acrylonitrile. It can be called the "mother of organic synthesis". At the same time, acetylene is widely used in other fields such as metal cutting and welding. There are many methods for the production of acetylene, such as the traditional calcium carbide method, the partial oxidation of methane, and the emerging plasma cracking method. Among them, the plasma method uses an arc plasma generator to heat the working gas (hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/24C07C7/11
CPCY02P20/54
Inventor 任其龙邢华斌李如龙苏宝根杨启炜赵旭何潮洪陈新志吴忠标陈丰秋荣冈
Owner XINJIANG YUEHETAI CHEM TECH CO LTD
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