Purification for separating feed gas in stabilized isotope 13C by low-temperature CO rectifying method

Abstract

Purification for separating charge gas of 13C stable isotope by CO low-temperature rectifying method is carried out by taking CO as charge gas, normal-temperature adsorbing, chemical purifying and low-temperature adsorbing. The content of O2 is <=0.01ppm, the content of H20 is <=0.01ppm and the content of CO2 is <=0.01ppm, they accord with technology requirement. It is simple and cheap, has advanced technology and high purifying efficiency and can be used to separate stable isotope 13C and 180 by CO low-temperature rectifying method.

Description

technical field

[0001] The invention relates to a chemical production process, in particular to a CO low-temperature rectification separation method 13 Purification process of raw material gas in C stable isotope. Background technique

[0002] CO cryogenic rectification method is the current method to produce stable isotope 13 The main method of C, the purity of CO feed gas is the key to CO cryogenic rectification. The cryogenic distillation process requires O in the CO feed gas 2 ≤0.1ppm, H 2 O≤0.1ppm, CO 2 ≤0.1ppm; while industrial CO feed gas, CO>90%, O 2 ≤5%, H 2 O≤3%, CO 2 ≤1%. Even electronic grade high-purity CO gas still contains H 2 O about 30ppm, CO 2 About 10ppm, O 2 About 50ppm, much higher than the process requirements. If the concentration of the above three components is too high, it is easy to crystallize in the rectification tower to block the pipeline, or even explode. Therefore, the deep purification technology of CO raw material gas determi...

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