NHD/MDEA/H2O复合脱硫液催化水解羰基硫

为解决传统湿法脱硫工艺中有机硫脱除效率低、副产物多等问题，依托配方型溶剂脱硫工艺，以聚乙二醇二甲醚（NHD）、N-甲基二乙醇胺（MDEA）和水为原料构建新型湿法催化水解羰基硫（COS）脱硫体系。优化复配溶剂组成比例，确立配方溶剂组成为25% MDEA/15% H₂O/60% NHD，考察了脱硫操作参数、反应温度、气体浓度、气体流量等因素对脱硫的影响，使用气相色谱和离子色谱分析探究脱硫过程及反应动力学。结果表明，在低温（298.15~343.15 K）、常压条件下对COS的脱除效率达80%以上；复配溶液将吸收后的COS催化水解为H₂S和CO₂，吸收过程符合准一级反应动力学。该脱硫液中有机溶剂含量占85%以上，可解决脱硫副产物产生多和碱耗大的问题，是一种新型有机介质脱硫工艺。

Catalytic hydrolysis of carbonyl sulfide with application of NHD/MDEA/H2O

To solve the problems of lower removal efficiency of organic sulfide and large amount of by-products in the traditional wet desulfurization process, a novel wet catalytic hydrolysis system of carbonyl sulfide was developed. The system was constructed with application of polyethylene glycol dimethyl ether (NHD), N-methyldiethanolamine (MDEA), and water as desulfurization agent with optimal compositions of 25% MDEA/15% H₂O/60% NHD. The effect of the desulfurization operation parameters, reaction temperature, gas concentration and gas flow rate on the desulfurization of COS was investigated. Furthermore the possible mechanism and kinetic of the desulfurization process were proposed and determined in reference of the results of GC and IC. The results show that the removal efficiency of COS is above 80% under low temperature (298.15—343.15 K) and normal pressure. The absorption process conforms to pseudo-first-order reaction kinetics. The organic solvent contents in the developed desulfurization system is more than 85%, which can effectively avoid the production of by-products and consumption of alkali in the desulfurization system, and is expected to be treated as an alternative for COS removal with high desulfurization efficiency.