System and method of preparing hydrogen rich gas and carbon monoxide from synthesis gas

Abstract

The invention relates to a system and a method of preparing hydrogen rich gas and carbon monoxide from synthesis gas. The system mainly comprises a synthesis gas purifying unit, a low-temperature liquefying separation unit and a CO product compressor, wherein the low-temperature liquefying separation unit is composed of a first plate-fin heat exchanger, a second plate-fin heat exchanger, a flash separator, a high-pressure rectification tower and a low-pressure rectification tower; a first evaporator is arranged at the bottom of the high-pressure rectification tower; a second evaporator is arranged at the bottom of the low-pressure rectification tower; and a first condenser is arranged at the top part of the low-pressure rectification tower. The system and the method are strong in adaptability to raw gas, little in equipment and small in investment, lower the requirement for impurities of the synthesis gas, eliminate a nitrogen compressor and an expander, increase the hydrogen recovery rate of a device and reduce the processing load of PSA or a membrane separation system.

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 separation...

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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

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