A system and method for producing hydrogen-rich gas and carbon monoxide from syngas

Abstract

The invention relates to a system and method for producing hydrogen-rich gas and carbon monoxide from synthesis gas. The system mainly includes a synthesis gas purification unit, a low-temperature liquefaction separation unit, and a CO product compressor. The low-temperature liquefaction separation unit includes a first plate Fin heat exchanger, second plate-fin heat exchanger, flash separator, high-pressure rectification tower, low-pressure rectification tower, the first evaporator is arranged at the bottom of the high-pressure rectification tower, and the low-pressure rectification The second evaporator is arranged at the bottom of the tower, and the first condenser is arranged at the top of the tower. The present invention has strong adaptability to the raw material gas, reduces the requirement for impurities in the synthesis gas, cancels the nitrogen compressor and expander, and has less equipment. The investment is small, the hydrogen recovery rate of the device is improved, and the processing load of the PSA or membrane separation system is reduced.

Description

technical field [0001] The invention relates to the field of gas low-temperature separation, in particular to a system and method for producing hydrogen-rich gas and carbon monoxide from synthesis gas. Background technique [0002] CO and H 2 It is an important synthetic raw material in the chemical process, and is widely used in the synthesis of a series of organic chemical products and intermediates, while CO and H 2 The preparation of coal, natural gas or oil is generally used as raw materials, and it is obtained through a certain method transformation. In the preparation process, the effective components CO and H are removed. 2 In addition, a certain amount of CH 4 , Ar and N 2 , CO 2 Such impurities exist in the form of mixtures, and chemical synthesis processes usually require high-purity CO, which requires a suitable method to separate and purify the mixture. [0003] CO and H 2 The separation methods mainly include pressure swing adsorption, membrane separatio...

AI Technical Summary

Problems solved by technology

[0004] The application number is 201310449360.5, the Chinese patent titled a device and method for cryogenically separating and purifying carbon monoxide and hydrogen, and the application number is 201420356780.9, and the title is a Chinese patent for a device for producing pure carbon monoxide and hydrogen-rich gas by cryogenic method, which has a relatively high methane content However, the Chinese patent with application number 201510014562.6 titled a method and device for producing hydrogen and high-purity carbon monoxide by separating syngas has made some improvements in purification and separation, but needs to increase the nitrogen cycle Compression and expansion machines, complex process, many machines, high energy consumption

Images