DME洁净燃料技术的研究开发(英文)

二甲醚（ＤＭＥ）由于具有高的十六烷值,在燃烧过程中可降低氮氧化物等有害气体的排放,实现无烟燃烧,可作柴油发动机的洁净替代燃料,被认为是"二十一世纪的洁净燃料"。此外,ＤＭＥ液化气的物性与液化石油气相似,燃烧性能优于液化石油气（ＬＰＧ）,可作优良的民用洁净燃料。九十年代初,中国科学院山西煤炭化学研究所在国内首先提出以ＤＭＥ替代ＬＰＧ作洁净民用燃料。他们在实验室研究开发了氧化铝和分子筛两种类型的甲醇脱水制二甲醚催化剂,考察了工艺条件对反应的影响;确定了产品的分离、精制过程;对催化剂制备放大后进行了寿命试验并在１升催化剂的模试装置上进行了验证;提出了适合中、小规模生产的甲醇催化脱水制ＤＭＥ液化气工艺流程并进行了５００ｔ／ａ甲醇脱水制ＤＭＥ液化气的工业试验,甲醇单程转化率为～７８％,ＤＭＥ收率为～９８％：对所生产的ＤＭＥ液化气进行燃烧试验、环境卫生及卫生防疫检测,结果符合国内有关标准。

RESEARCH AND DEVELOPMENT OF DIMETHYL ETHER AS CLEAN FUEL

Dimethyl ether (DME) is an alternative domestic and diesel fuel. Its new application as a clean domestic fuel was firstly proposed by Institute of Coal Chemistry.A process to produce DME by methanol dehydration was developed. The research and development of two types of catalysts for methanol dehydration and the life time test of the catalysts were carried out. The effects of temperature, liquid hourly space Velocity(LHSV) and Water content in methanol on methanol conversion were also investigated. Scale- up of catalysts was performed in a reactor packed with 1 L of catalyst. A commercial plant of 500 t/a of DME was set up.