Pre-washing technology and device used for cryogenic separation of synthesis gas

Abstract

The invention discloses a pre-washing technology and device used for cryogenic separation of synthesis gas. The pre-washing technology includes the steps that after the synthesis gas is pre-cooled, pre-washing is conducted through a pre-washing agent to remove unsaturated hydrocarbon and macromolecule saturated hydrocarbon, and finally purified raw material synthesis gas is obtained; the purifiedraw material synthesis gas is subjected to follow-up synthesis gas cryogenic separation; the ice point of the pre-washing agent is lower than the operation temperature of the follow-up synthesis gas cryogenic separation technology. On the basis of current methane washing, carbon monoxide washing and partial condensation synthesis gas cryogenic separation technologies, the novel pre-washing technology used for synthesis gas cryogenic separation is adopted, and unsaturated hydrocarbon and macromolecule saturated hydrocarbon in the raw material synthesis gas are removed in advance to be preventedfrom entering the downstream and blocking downstream equipment or downstream pipelines. The on-line rate of a cold box for the cryogenic separation technology is increased, and meanwhile the safety of the cold box can be improved to solve the problem that the cold box is blocked under freezing.

Description

technical field [0001] The invention belongs to the technical fields of cryogenic separation, natural gas chemical industry, coal chemical industry, etc., and in particular relates to a pre-washing process and device for cryogenic separation of synthesis gas. Background technique [0002] At present, the partial condensation process, methane washing process and carbon monoxide washing process, which are widely used in the cryogenic separation of syngas, will face the freezing of unsaturated hydrocarbons or macromolecular hydrocarbons in the raw syngas in the cold box, which will affect the long-term safe operation of the cold box possibility. [0003] The usual purification treatment method for raw gas is the molecular sieve adsorber at the front of the cold box, which partially adsorbs unsaturated hydrocarbons or macromolecular hydrocarbons through molecular sieves, but the main purpose of the molecular sieve adsorber is to adsorb moisture and carbon dioxide in the synthesi...

AI Technical Summary

Problems solved by technology

[0014] However, when the upstream device cannot handle excess ethylene and other macromolecular hydrocarbons, the safe operation of the cold box faces a great challenge. If such components cannot be separated, then enter the low-temperature section of the heat exchanger or the washing tower and rectifying tower process When the cold box is blocked, it will affect the long-term stable and safe operation of the cold box

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