摘要:
Disclosed is a method for the production of synthetic fuels, wherein, in a first step, a gas mixture consisting of methanol and/or dimethyl ether and/or another oxygenate and water vapor is reacted at temperatures of 300-600° C. in order to form olefins with, preferably, 268 carbon atoms. In a second step, the olefin mixture thus obtained is oligomerized at an elevated pressure to form higher olefins with predominantly more than 5, preferably 10-20 carbon atoms. According to said method, a) the production of olefins in the first step is carried out in the presence of a gas flow which essentially consists of saturated hydrocarbons which are separated from the product flow of the second step and returned to the first step, and (b) the production of olefins is carried out in the second step in the presence of a flow of water vapor which is separated from the product flow of the first step and returned to the first step.
摘要:
In a method for the production of propylene, a charge stream containing C4 to C6 olefins is evaporated, superheated, mixed with hot water vapor, the olefins vapor mixture converted on a zeolite catalyst, the reaction mixture formed thereby cooled, and then partially condensed. In order to increase the yield of propylene, the gaseous phase containing ethylene, propylene, C4 to C8 olefins, and additional hydrocarbons that is accumulated during the partial condensation is compressed, the gaseous and liquid phase containing propylene, ethylene, and other light hydrocarbons that exit from the compression step is separated into a gaseous phase containing propylene, ethylene, and other light hydrocarbons and a liquid phase containing C4+ olefins, and the liquid phase is separated into a fraction containing C4 to C6 olefins and a fraction containing C7+ olefins.
摘要翻译:在制备丙烯的方法中,将含有C 4 -C 6烯烃的电荷流蒸发,过热,与热水蒸气混合,将烯烃蒸气混合物转化为 沸石催化剂,由此形成的反应混合物冷却,然后部分冷凝。 为了提高丙烯的产率,含有乙烯,丙烯,C 4 -C 8烯烃的气相和在部分冷凝期间积聚的其它烃被压缩 含有丙烯,乙烯和从压缩步骤出来的其它轻烃的气相和液相被分离成含有丙烯,乙烯和其它轻质烃的气相和含有C 4 +烯烃,并将液相分离成含有C 4 O 6至C 6 O 6烯烃的馏分和含有C 7+烯烃的级分。
摘要:
In producing C2-C4 olefins, in particular propylene, from an educt mixture containing steam and oxygenates, such as methanol and/or dimethyl ether, the educt mixture is reacted in a reactor on a catalyst to a reaction mixture comprising low-molecular olefins and gasoline hydrocarbons, which in a first separating device is separated into a mixture rich in C5− olefins, a mixture rich in C5+ gasoline hydrocarbons, and an aqueous phase. To increase the yield of propylene the mixture rich in C5+ gasoline hydrocarbons is supplied to a second separating device, in which the aromatics contained in the mixture are separated. The residual stream largely free from aromatics is at least partly recirculated to the reactor.
摘要:
The granular, form-selective zeolite catalyst used as bed in a process of producing lower olefins from a feed mixture of higher olefins must be decoked from time to time. This is effected such that the reactor is rinsed with a nitrogen stream heated to 460 to 500° C. for expelling the hydrocarbons, the reactor is then cooled with a nitrogen stream heated to 420 to