HCN、COS和CS_2催化水解及其水解产物协同净化的研究进展

Research progress in catalytic hydrolysis of HCN,COS and CS_2 and synergetic purification of hydrolysates

氰化氢(HCN)、羰基硫(COS)、二硫化碳(CS_2)广泛共存于黄磷尾气、焦炉煤气、碳一化工等化工行业废气中,目前大多数研究局限于3种气体的单独脱除,3种气体同时脱除的研究鲜有报道,而3种气体的协同脱除势在必行。催化水解法能够将HCN转化成NH_3,COS和CS_2水解成H_2S。NH_3和H_2S可以分别被催化氧化为N2及S,S可以回收利用。一步法实现HCN、COS和CS_2的水解及水解产物NH_3和H_2S的催化氧化的催化剂开发是该技术的核心问题,本文针对近几年3种气体水解催化剂的相关研究成果进行了综述,包括负载型催化剂和非负载型催化剂,与此同时,针对水解产物NH_3和H_2S的催化氧化的协同净化技术进行了分析,旨在为后续3种气体同时催化水解及协同净化其水解产物催化剂的开发提供理论指导,为低温环境下协同催化水解HCN、COS和CS_2,并利用原料气中的氧一步法净化水解产物技术的未来发展及应用提供参考。

HCN（hydrogen cyanide）,COS（carbonyl sulfide）and CS2（carbon disulfide） are widely coexisted in the chemical industry tail gas,for example,yellow phosphorus tail gas,coke oven gas and C1 chemical industry.At present,there are many studies on the single removal of the three gases,and the research on the simultaneous removal of the three gases is rarely reported.So simultaneous removing of three gases is necessary.HCN can be converted into NH3,and COS/CS2 can be converted into H2S during the catalysis hydrolysis process.NH3 and H2S can be catalytic oxidized to N2 and S respectively,and S can be recycled.The development of catalysts for the simultaneous catalytic hydrolysis of HCN,COS and CS2 and oxidation of NH3 and H2S in one step is the key problem of this technology.In this paper,the related research achievements of catalysts for hydrolysis of three gas were reviewed both in supported catalyst and unsupported catalyst.Meanwhile,the synergetic purification technology of hydrolysates（NH3 and H2S）was analyzed.This paper provides a reference to the development and application of the way that catalytic hydrolysis of HCN/COS/CS2 and synergistic purification of hydrolyzate in one-step at low temperature.