“Shell Middle Distillate Synthesis process”如何翻 ...？ 本帖最后由 olivetree 于 2009-8-3 21:54 编辑 俺灰常灰常抱歉仍占用这里的版面继续讨论 it looks likely that it would be better to separate the c20 fractions from the overall ft synthesis products prior to the 3rd stage. otherwise they will be further cracked into even smaller components(such as gas). however, the highly linear ft products are not the ideal components for kerosene/diesel and shall be branched. shell would rather go for high yield of wax(i.e. high alpha value) instead of middle fractions in the 2nd stage and hydro-isomeriaze/hydrocrack( in the presence of the catalyst of combined functions) the wax into desirable kerosene/diesel fractions in the 3rd stage. therefore, it could be possible to direct overall liquid ft synthesis products into the 3rd stage without any additional distillation with the consideration of the following aspects: 1. 20 fractions are of limited amount in the ft synthesis products; 2. in the 3rd stage, 20 fractions can be either isomerized into desirable fractions or further cracked into even smaller components. very likely shell makes the former prevail, otherwise the smds could ‘make gas from gas’ in the 3rd stage. just my 2 cents. 查看更多
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