Cryogenic separation device with ethylene removal, dehydrogenation, demethanization and denitrification functions

Abstract

The invention discloses a cryogenic separation device with ethylene removal, dehydrogenation, demethanization and denitrification functions. The cryogenic separation device with the ethylene removal,dehydrogenation, demethanization and denitrification functions comprises a molecular sieve adsorption unit, a cryogenic separation device cold box unit and a CO circulating compressor unit, wherein the molecular sieve adsorption unit communicates with the cryogenic separation device cold box unit, and the cryogenic separation device cold box unit communicates with the CO circulating compressor unit; mixed gas is delivered into the molecular sieve adsorption unit to be purified, the purified gas enters the cryogenic separation device cold box unit to be separated, and the CO circulating compressor unit provides a pressure for the cryogenic separation device cold box unit. The cryogenic separation device has the ethylene removal function and can separate out obtained high-purity product gas,the purity can reach 90% or over, the content of H2 and the content of CH4 in the gas are smaller than 50 ppm, and the recovery rate is high; and the problem that ethylene and methane are likely to be frozen in the separation process can be solved; and energy consumption is low, the investment is small, and adjustment is easy.

Description

technical field [0001] The invention relates to a cryogenic separation device, more specifically, to a cryogenic separation device integrating the functions of deethylene, dehydrogenation, demethanization and denitrogenation, and belongs to the field of chemical industry. Background technique [0002] The production capacity and output of ethylene glycol are far from meeting the growing domestic market demand for polyester, and its self-sufficiency rate is less than 60%, mainly relying on imports. At present, the technology of producing ethylene glycol from syngas as raw material has made a major breakthrough, and has great economic advantages, and has been vigorously developed, which has greatly promoted the rapid growth of the demand for CO cryogenic separation devices. The raw materials for the production of ethylene glycol include coal gasification synthesis gas, natural gas conversion synthesis gas, coke oven gas conversion synthesis gas, calcium carbide furnace tail ga...

AI Technical Summary

Problems solved by technology

[0002] The production capacity and output of ethylene glycol are far from meeting the growing market demand for domestic polyester, and its self-sufficiency rate is less than 60%, mainly relying on imports

[0003] At present, the patents published by CO cryogenic separation methods include CO / H 2 The single-tower process of binary components, Chinese patent document CN200980113560.5) records the removal of hydrogen, but the maximum purity of CO reaches 98.5%, and the purity is relatively low, which cannot meet the requirements of high-purity CO product gas (≥99%) requirements, while for impurity N 2 、CH 4 The further purification and separation of CO, the Chinese patent CN201480063530.9 records the two-tower and three-tower process used, and the Chinese patent CN201611184618.3 records that the three-tower process is used to purify and separate CO in the nitrogen cycle refrigeration process, but there is no A cryogenic separation device has been developed for the treatment of olefins, H 2 , N 2 、CH 4 The mixed gas is separated to obtain high-purity CO

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