第43卷第4期
油气处理与加工
石油与天然气化工
CHEMICAL ENGINEERING OF OIL & GAS
优化C4原料生产低硫MTBE 并回收二硫化物的方法探讨
刘成军孙惠山温世昌周璇（中国石油工程建设公司华东设计分公司）
345
摘要探讨了一种生产低硫MTBE产品并回收二硫化物的方法。根据C4馅分中各组分及硫杂质沸点的不同，将其送入1台C馅分分割塔中，塔顶分出的是作为MTBE装置原料的轻C 馅分；侧线抽出重C4馅分，主要含Cs、顺丁烯、乙硫醇、异丙硫醇等较重组分，抽出量占C馅分总量的8%～15%：在侧线抽出板的下层塔板上设二硫化物循环进料线，主要用于解决C4馅分中二硫化物含量小、塔底液位控制困难的问题；分割塔塔底出料为二硫化物，被送至经过特别设计的间歇操作二硫化物分馅塔，分离出二甲基二硫和二乙基二硫混合物，用作化工原料或产品。经处理后的轻C4馅分已不含C5及乙硫醇等重硫化合物,故可保证以其为原料生产的MTBE中总硫质量分数降至10m/k以下。该方法具有工艺简单、不需要外部吸附剂或吸收剂、无新增三废污染等优点，
关键词MTBE硫含量C4馏分二硫化物C，馏分分割塔二硫化物分馅塔
中图分类号：TE624.8+1文献标志码：BDOI：10.3969/j.issn.1007-3426.2014.04.001
Discussion of producing MTBE withlow sulfur content and
recoveringbisulfidesbyoptimizingC4feedstock LiuChengjun,SunHuishan，WenShichang，ZhouXuan
(CPECCEast-ChinaDesignBranch,Qingdao266071,Shandong,China)
Abstract : A method of producing MTBE product with low sulfur content and recovering bisul fides (RSSR) was discussed . Based on the boiling point differences of the components and sulfides in the mixed C4 fraction, mixed C fraction were sent to a fractionator to separate the light C fraction and heavy C+ fraction . The top products were routed to M TBE unit as light C+ fraction , while the heavy C+ fraction were drawn as side product , which mainly contained Cs , cis butylene ethanethiol, iso-propanethiol, etc. The heavy C4 fraction account for about 8% 15% of the total mixed C4 fraction ration . A RSSR recycling feedback line was set on just beneath the lowest side. draw tray of the fractionator mainly to solve the problem of bottom level control due to the small amount of RSSR. The bottom products (mainly RSSR) were sent to a RSSR fractionator, which was specially designed and operated batchwise . Dimethyl-bisulfides and diethyl-bisulfides were separated in the fractionator and used as chemical raw materials or chemical products . The trea. ted light C4 fraction contains no heavy sulfides such as Cs or ethanethiol, so that the total sulfur content of the M TBE produced by the treated light C+ fraction was decreased to below 1O mg/kg . The method has advantages of simple process , no need of outside adsorbents or absorbents , and no additional waste emissions.
Key words : MTBE, sulfur content , mixed C4 fraction, bisulfide, C4 fractionator, RSSR frac. tionator
作者简介：刘成军（1967一），男，山东沂南人，教授级高级工程师，1989年毕业于成都科技大学化学工程专业，一直从事石油与天然气化工专业设计工作，已发表论文40篇。地址：（266071)山东省青岛市华严路2号工艺室。电话：0532-80950783。 E-mail liuchengjur@ cnpocei .cn