Acetylene tail gas recovery device for BDO production

Abstract

The invention discloses an acetylene tail gas recovery device for BDO production, and solves the problems of large methanol replacement amount and incapability of long-period stable operation in the existing BDO production technology. Acetylene tail gas from an ethynylation reaction system is washed by a washing tower, then enters a tail gas compressor, is pressurized, passes through a liquid removal system, enters an absorption tower after water and other small liquid drops are removed, tail gas subjected to low-temperature methanol absorption is fed into an acetylene torch, rich liquid enters a regeneration tower to be regenerated, and tower bottom regeneration liquid returns to the absorption tower to be recycled. Recycled acetylene is obtained from the tower top. The method is simple in process, convenient to operate, low in methanol replacement amount, good in device operation stability and high in competitiveness.

Description

technical field [0001] The invention relates to an acetylene recovery system, in particular to an acetylene tail gas recovery device for BDO production. Background technique [0002] 1,4 Butynediol is an important organic intermediate. In its preparation process, the most widely used in industry is the Reppe method, also known as the alkyne aldehyde method. The method uses bismuth-containing acetylene-copper complex as a catalyst, and the bismuth-containing acetylene-copper complex is adsorbed on the carrier, and acetylene reacts with formaldehyde aqueous solution to generate 1,4-butynediol and release heat. [0003] The acetylene reaction is a cyclic reaction. In order to improve the effect of the acetylene reaction, the acetylene must be vented to avoid the accumulation of inert gas. The acetylene tail gas is mainly composed of acetylene, nitrogen, carbon dioxide, methane, hydrogen and trace amounts of formaldehyde, methanol and propynyl alcohol. , water, catalyst powder ...

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Problems solved by technology

[0005] Patent CN208279528U discloses an integrated acetylene recycling device, including a first-stage condensation separator, a second-stage condensation separator, a fractional reflux rectification tower and an acetylene gas cabinet, and adopts a two-stage condensation separator and a fractional condensation reflux rectification tower Realize the separation and recovery of acetylene and solvent mixture gas, this process cannot effectively remove inert gas, and the purity of acetylene cannot be guaranteed

[0006] Patent CN206138959U discloses an acetylene tail gas recovery and concentration system, which mainly includes an absorption tower and a regeneration tower, and low-temperature methanol is used as an absorbent. In this process, the acetylene tail gas directly enters the absorption regeneration system, and formaldehyde, propynyl alcohol, water, catalyst powder, etc. Into the circulating methanol, the replacement amount of methanol is large, and the entry of water will have a certain impact on the long-term stable operation of the system

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