电石炉尾气净化分离用于合成乙二醇的新工艺  

Novel purification and separation process of calcium carbide furnace tail gas for synthesis of ethylene glycol

作　　者：肖二飞[1] 雷军[1] 刘应杰[1] 刘华伟[1] 钱胜涛[1] 吕明[1] 成春喜[1] 王先厚[1] 孔渝华[1] 

机构地区：[1]华烁科技股份有限公司,工业气体净化精制与利用湖北省重点实验室,湖北武汉430074

出　　处：《天然气化工—C1化学与化工》2016年第6期95-97,共3页Natural Gas Chemical Industry

摘　　要：电石炉尾气富含CO,其中φ（CO）约为65%~90%,φ（H2）约为8%~15%,此外还含有N2、CH4和微量的S、P、As、F、HCN、O2、Cl、不饱和烃等。提出了一种净化分离方法得到的CO和H2可用于草酸酯加氢路线合成乙二醇,电石炉尾气出气柜压缩后,预净化,然后经脱硫、磷、砷、氟、氯、HCN、羰基金属,脱氧深度净化脱除电石炉尾气中的H2S、COS、CS2、PH3、As H3、HF、HCN、HCl、羰基金属、O2,再将深度净化后的一部分电石炉尾气经变压吸附（CO-PSA）分离出高浓度的CO,脱氢,得到纯CO;另一部分电石炉尾气与CO-PSA解析气混合后在铁铬系高温变换催化剂和铜锌系低温变换催化剂的催化作用下,发生变换反应使变换后体系中φ（CO）〈0.3%,然后经PSA脱除CO2,PSA提纯H2,得到高纯H2。制取的纯CO和纯H2作为原料气用于生产乙二醇比煤为原料投资省,成本低。Calcium carbide furnace tail gas composition is complicated, containing CO of about 70%-90%, H2 of about 8%-15% by volume and many impurities, such as N2, CH4, S, P, As, F, HCN, O2, Cl and unsaturated hydrocarbons. A novel process for purification and separation of this tail gas to obtain the feedgases CO and H2 which could be used for synthesizing ethylene glycol by the oxalic ester hydrogenation route is proposed, which includes the follow steps： （1） pre-purifying the gas from the calcium carbide furnace tail gas holder after compression; （2） deeply removing the compounds of sulfur, phosphorus, arsenic, fluorine and chlorine, HCN, metal carbonyl compounds and O2; （3） one part of the gas from （2） goes to produce the high purity CO through pressure swing adsorption （CO-PSA） separation and then dehydrogenation; （4） the other part of the gas from （2） is mixed with the CO-PSA desorption gas to produce the high purity H2 through high temperature and low temperature two stage water-gas shift reactions to converse CO to below 0.3% by volume, then removing CO2 by PSA and purifying H2 by H2-PSA. Using thus produced high purity CO and H2 to produce ethylene glycol has lower investment and product cost than using the CO and H2 directly produced from coal.

关 键 词：电石炉尾气 净化分离 一氧化碳 氢气 乙二醇 

分 类 号：TQ028[化学工程] TQ161