SCUL系列溶剂对硫醇的溶解研究及抗发泡性能优化  

Dissolution of mercaptan in SCUL solvent and optimization of anti-foaming property

作　　者：刘伟[1] 沈俊[1] 罗仕忠[1] LIU Wei;SHEN Jun;LUO Shi-zhong(School of Chemical Engineering,Sichuan University,Chengdu 610065,Sichuan,China)

机构地区：[1]四川大学化学工程学院,四川成都610065

出　　处：《天然气化工—C1化学与化工》2021年第1期55-60,共6页Natural Gas Chemical Industry

摘　　要：对于中石化西北油田分公司二号联处理站产出的高含硫天然气,其中硫醇(RSH)含量很高,需研发出高效的吸收溶剂对其进行处理。通过分子理论和热力学理论研究分析,在N-甲基二乙醇胺(MDEA)水溶液基础上,以环丁砜(SUL)、聚乙二醇二甲醚(NHD)两种强极性非质子物理溶剂和微量杂环化合物为添加组分,设计出了SCUL系列溶剂;使用有机硫专用气相色谱对气相RSH含量进行了检测,探究了不同吸收温度、吸收压力、添加剂比例下SCUL溶剂对RSH的静态溶解效率,并对SCUL溶剂的抗发泡性能进行了实验测定与优化。结果表明:SCUL1、SCUL2对甲硫醇、乙硫醇的吸收效率均较高,然而由于两种添加剂极性不同,造成二者对RSH吸收效率的差异;在相同实验条件下,两种溶剂中甲硫醇的溶解度均大于乙硫醇,SCUL1溶剂对RSH的溶解度大于SCUL2溶剂,且随着添加剂用量的增加,RSH的溶解度增大。抗发泡性能优化实验发现:对于二号联实地净化,DF-4消泡剂可以作为比较优化、适宜的消泡添加剂组分。For the high sulfur natural gas from No.2 combined processing plant of Sinopec Northwest Oilfield Company,the content of mercaptans(RSH)is very high,so it is necessary to develop an efficient absorption solvent to treat it.Based on Nmethyldiethanolamine(MDEA)aqueous solution,SCUL series solvents were designed through molecular theory and thermodynamic theory analysis,with the strong polar aprotic physical solvents of sulfolane(SUL)and polyethylene glycol dimethyl ether(NHD)and trace heterocyclic compounds as additives.The RSH content in the gas phase was detected by a special gas chromatography for organic sulfur.The static dissolution efficiencies of SCUL solvents to RSH at different absorption temperatures,absorption pressures and additive ratios were studied,and the anti-foaming performances of SCUL solvents were experimentally measured and optimized.The results showed that the absorption efficiencies of SCUL1 and SCUL2 for both methyl mercaptan and ethyl mercaptan were high,while the difference of RSH absorption efficiency was due to the different polarity of the two additives.Under the same experimental conditions,the solubility of methyl mercaptan in the two solvents was higher than that of ethyl mercaptan,and the solubility of SCUL1 to RSH was higher than that of SCUL2.Moreover,the solubility of RSH increased with the increase of the additive dosage.The anti-foaming optimization experiments showed that DF-4 defoaming agent could be used as a relatively optimized and suitable defoaming additive component for the field purification of natural gas in the No.2 combined processing plant.

关 键 词：SCUL溶剂 硫醇 MDEA 吸收 消泡剂 

分 类 号：TE64[石油与天然气工程—油气加工工程] TQ028.25[化学工程]