A purification system and method for producing acetylene from natural gas

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...

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