“Shell Middle Distillate Synthesis process”如何翻 ...？ 21# olivetree 根据您提供的截图，我知道了您说的 a值 是 链增长的概率 。 壳牌公司不会追求过高的a值 ，因为过高了会增加 hydrocracking（ 加氢裂解 ） 的成本 。 根据 壳牌自己的说法，他们的目的并非是碳原子量越长越好， 是为了 a very high overall yield of product in the desired range （就是希望中间馏分的含量最高） ： 原文如下： shell middle distillate synthesis: the process, the plant, the products i peter j. a. tijm shell international gas ltd. shell centre, downstream building london ** 7na. u.k. 节选： the next step of the process, the hydrocarbon synthesis, is, in fact, a modernized version of the classical fischer-tropsch (ft) process, with the emphasis on high yields of useful products. the fischer-tropsch process developed by shell for smds favors the production of long chain waxy molecules which, as such, are unsuitable for transportation fuels. the hydrocarbon synthesis step is therefore followed by a combined hydro-isomerization and hydrocracking step to produce the desired, lighter products. by opting for the production of waxy molecules in the fischer-tropsch step, the amount of unwanted smaller hydrocarbons or gaseous products. produced as by-products, is substantially reduced. this means that the process, contrary to the old 1930s fisher-tropsch technology, can be fuel balanced and does not make "gas" out of gas. combined with the high selectivity towards middle distillates in the hydrocracking step this leads to a very high overall yield of product in the desired range. 原文的大意是：我公司采用的是新型的费托合成工艺，不同于1930年的那个工艺，新型的工艺气烃类很少（not make "gas" out of gas），得到的液体多（ can be fuel balanced ）。 hps步骤的主要产物是重质蜡。但是 long chain waxy molecules 重质蜡不能作为运输燃料，所以需要再次 hydrocracking。这样 hps和 hydrocracking 结合，得到一个高含量的“中间馏分”产品（ a very high overall yield of product in the desired range）。 查看更多
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