A purification system and method for producing acetylene from natural gas

A natural gas and acetylene technology, applied in the field of removing impurities in acetylene produced by natural gas, can solve the problems of difficult disposal of waste acid and large consumption of acid and alkali, achieve uniform and gentle absorption and regeneration conditions, reduce solvent loss, and equipment Effects with low material requirements

Active Publication Date: 2017-11-14
BEIJING HUAFU ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems in the prior art of using concentrated sulfuric acid to treat high-level unsaturated hydrocarbons in acetylene raw material gas, the consumption of acid and alkali is large, and the waste acid is difficult to handle. method for hydrocarbon impurities, and provide a purification system corresponding to the method

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  • A purification system and method for producing acetylene from natural gas

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Embodiment 1

[0051] This embodiment relates to a purification system for producing acetylene from natural gas, and its structural diagram is as follows figure 1 :

[0052] It includes an acetylene absorption tower 1, a flash tank 3, a hydrogenation reactor 5, and a carbonization tower 8 connected in succession with absorption liquid; the liquid outlet 11 on the hydrogenation reactor is connected to the liquid inlet of the acetylene absorption tower 12.

[0053] A regeneration tower 4 is arranged between the flash tank 3 and the hydrogenation reactor 5, and the gas outlet 9 on the regeneration tower 4 is connected to the gas inlet 10 of the acetylene absorption tower.

[0054] A liquid cooling device 13 is provided between the liquid outlet 11 of the hydrogenation reactor 5 and the liquid inlet 12 of the acetylene absorption tower.

[0055] A cooler 6 and a gas-liquid separator 7 connected in sequence are also provided between the hydrogenation reactor 5 and the carbonization tower 8 .

Embodiment 2

[0057] This embodiment relates to a method for purifying acetylene produced by natural gas cracking, comprising the steps of:

[0058] 1) The raw material gas obtained by partial oxidation of natural gas is passed into the acetylene absorption tower, partially absorbed by the absorption liquid, and the gas that cannot be absorbed is discharged out of the acetylene absorption tower; the space velocity of the raw material gas is 600Nm 3 / h, the pressure in the absorption tower is 0.45MPa, and the gas composition is to contain 7.8% (molar concentration, the same below) C 2 h 2 , 4.9%CH 4 , 0.2%C 2 h 4 , 25.7% CO, 0.9% N 2 , 55.9%H 2 , 3.3%CO 2 , 1.2% higher alkynes and other small amounts of C 6 + the above components. The absorption liquid is a mixed solvent of 1,3-diacetamide imidazole bis(trifluoromethanesulfonyl)imide salt ionic liquid and propylene carbonate, and its flow rate is 5m 3 / h, wherein the mass content of propylene carbonate is 50%, and the rest is 1,3-d...

Embodiment 3

[0065] This embodiment relates to a method for purifying acetylene produced by natural gas cracking, comprising the steps of:

[0066] 1) The raw material gas obtained by partial oxidation of natural gas is passed into the acetylene absorption tower, partially absorbed by the absorption liquid, and the gas that cannot be absorbed is discharged out of the acetylene absorption tower; the space velocity of the raw material gas is 600Nm 3 / h, the pressure in the absorption tower is 0.45MPa, and the gas composition is to contain 7.8% (molar concentration, the same below) C 2 h 2 , 4.9%CH 4 , 0.2%C 2 h 4 , 25.7% CO, 0.9% N 2 , 55.9%H 2 , 3.3%CO 2 , 1.2% higher alkynes and other small amounts of C 6 + the above components. The absorption liquid is a mixed solvent of 1,3-diacetamide imidazole bis(trifluoromethanesulfonyl)imide salt ionic liquid and propylene carbonate, wherein the mass content of propylene carbonate is 5%, and the rest is 1,3-di Acetamidoimidazole bis(triflu...

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Abstract

The invention relates to a purifying system and method for acetylene preparation from natural gas. The purifying method comprises the following steps: 1) introducing the product obtained by oxidative cracking of natural gas into an acetylene absorption tower, wherein the acetylene, carbon dioxide and other alkynes are absorbed by the absorption liquid, and the non-absorbed gases are discharged out of the acetylene absorption tower; 2) introducing the absorption liquid into a flash tank, wherein the acetylene is separated out through flashing to obtain a finished product of acetylene and the absorption liquid without acetylene; 3) introducing the absorption liquid without acetylene into a hydrogenation reactor for hydrogenation reaction to obtain a mixed gas of alkane gases and CO2; and 4) introducing the mixed gas into a carbonization tower, wherein ammonium bicarbonate is generated through CO2 reaction to realize separation of the alkane gases and CO2. According to the purifying system and technology provided by the invention, the solvent can be recycled, and high-purity acetylene product is obtained while impurities can recycled and turned into wealth, for example, other alkynes are hydrogenated and used as a cracking raw material, and CO2 reacts with strong ammonia water and is converted into ammonium bicarbonate.

Description

technical field [0001] The invention belongs to the field of chemical gas purification, in particular to a method for removing impurities in acetylene produced by utilizing natural gas. Background technique [0002] Acetylene is widely used in the synthesis of a series of organic products such as acetaldehyde, acetic acid, rubber, plastic, fiber, etc. The main raw materials for the production of acetylene are calcium carbide and natural gas. For a long time, the domestic production of acetylene has basically been using the calcium carbide method. However, with the intensification of the global warming effect and the deepening of the concept of cleaner production, it will become more and more difficult to produce acetylene by the calcium carbide method. The production of acetylene with natural gas as raw material accounts for 1 / 4 in foreign countries, 3 / 4 in the United States, and less than 5% in my country. With the continuous improvement of people's environmental awarenes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/00C07C7/11C07C7/167C07C11/24
CPCC07C7/005C07C7/11C07C7/167C07C11/24Y02P20/54
Inventor 史雪君吴道洪
Owner BEIJING HUAFU ENG
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