Steel Tail Gas Purification-Converter Gas to CO

Separation of CO from converter gas is an international problem, which is mainly due to the converter gas also contains a large number of N2 and CO2. Because of the close boiling point of N2 and CO, the traditional cryogenic rectification process can not be used to separate CO from converter gas. The adsorption of CO and N2 is low, so the conventional pressure swing adsorption method can not be used for CO separation of converter gas.

Based on mature and leading PSA CO technology and the characteristics of converter gas, PIONEER has developed the process of the formation of a unique CO separation technology of converter gas, which can be applied to get over 99% purity of CO product in large capacity from converter gas economically. The enriched CO gas can be used for producing high value-added chemical products.

CO is a kind of important raw material with chemical synthesis. It can purify CO from the converter gas to over 99%, which is used for the production of ethylene glycol, acetic acid, dimethyl carbonate, polycarbonate, TDI, DMF and other chemical products, thus significantly enhancing the added value of the gas. To obtain CO by the use of converter gas has a large cost advantage. With the rapid development in the non-steel industry, it has attracted attention by many domestic and overseas famous iron and steel enterprises.

Economic Benefit Analysis
The remained converter gas can be used for electricity generation except for converter fuel gas use. However, because its calorific value is low, the value added for electricity generation is low, and at the same time the carbon emission is high. The purified CO for chemical synthesis not only can decrease the investment of that from fossil raw material, but also can increase the added value and decrease the carbon emission. It is friendly environmental.

Successful Case
This technology has been applied to Shandong Aside Technology Company, and the flow of the converter gas is 45000 Nm3/h for 18000 Nm3/h CO product, of which the purity is 98.5%. This application is for 200000 t/a methane acid and 50000 t/a oxalic acid. Compared with the converter gas for electricity generation use, 318 thousand tons carbon emission can be saved per year.