合成气制备工艺和二甲醚合成工艺的集成

在固定床反应器中，用3种典型的天然气造气工艺制备的合成气制备二甲醚，考察了温度、压力、空速等反应条件对催化剂性能的影响．实验结果表明，由于合成气一步法合成二甲醚是一个体积减小的反应，随着压力的增加，CO转化率增加；随着空速的增加，CO转化率降低；随着温度的升高，CO转化率先增加，达到一定值后，逐渐开始下降．分别用丹麦Topscpe甲醇合成催化剂和国产甲醇合成催化剂制备了DME合成催化剂，对其性能进行比较发现，前者具有较好的低温催化性能．用CH4-Air-H2O-CO2转化工艺制备的合成气，即含氮合成气合成二甲醚在适当增加压力的条件下，可取得较高的CO单程转化率和二甲醚回收率，且天然气的消耗量较少．

An Integrated Process of Syngas Production and Dimethyl Ether Synthesis

DME synthesis from the synthesis gases produced by three typical syngas production processes respectively was carried out in a fix-bed reactor.The influences of temperature,pressure and space velocity on the catalyst activity were investigated.The results showed that conversion of CO increases with increasing of the pressure and decreases with increasing of the space velocity; conversion of CO increases firstly with the temperature increasing,reaching the maximum,and then decreases with the temperature further increasing.The results also demonstrated that T-J catalyst shows better activity at low temperature than G-J catalyst. Also,it was found that the DME synthesis from the syngas derives from CH_4-Air-H_2O-CO_2 process,i.e. syngas containing N_2,can achieve high CO single pass conversion and DME yield with low consumption of nature gas under a suitable high pressure.