降低MTBE产品硫含量的探讨

对国内炼油厂MTBE总硫含量偏高的原因进行了分析.指出液化石油气脱硫醇过程中产生的RSSR(二硫化物)液滴直径小、与碱液的密度差小,且碱液的黏度较高,这些因素使RSSR无法仅靠重力作用从碱液中脱除,在碱液循环过程中又被反抽提至液化石油气中,造成液化石油气总硫含量超标.另外,MTBE装置催化剂的磺酸基团脱落也会造成MTB...

Study on reducing sulfur in MTBE product

The causes of higher total sulfur in MTBE product in domestic refineries were analyzed.It was pointed out that,in LPG sweetening process,the liquid droplet diameter of generated RSSR（bisulfide） was small,the density difference between RSSR and alkaline was also small,and the viscosity of alkaline was high.All of these made it difficult for RSSR to be separated from alkaline merely by gravity.Meanwhile,RSSR was anti-extracted from alkaline to LPG,causing LPG total sulfur content exceeding standard specification.Moreover,the falling off of sulfonic acid radical in catalyst of MTBE unit also led to build-up of sulfur in MTBE product,but the increase would not generally exceed 10 μg/g.The installation of internals which could help bisulfide accumulation in bisulfide separation drum would intensify the separation of RSSR from alkaline.If stricter requirement for sulfur content of MTBE was a necessity,distillation approach could be applied to remove sulfides from MTBE.In China,research efforts are being made to remove RSSR from MTBE by absorption process,but it is in the preliminary stage.