| 摘要 |
<p>An integrated process for producing distillate fuel from syngas is disclosed. Syngas is reacted under Fischer-Tropsch conditions to form a product stream which includes a naptha fraction, a distillate fuel fraction and a fraction that includes mostly wax and heavy products. The wax fraction is subjected to the Paragon process, and the light olefins generated in this process are oligomerized to form additional iso-olefins, which are optionally reduced to form isoparaffins. Naptha and distillate fuels can be isolated from the oligomerization step, and wax and heavy fractions from the oligomerization step are optionally recycled to extinction. Preferably, at least a portion of the syngas used in the Fischer-Tropsch chemistry is derived from natural gas. The C3+ products from the natural gas and the Fischer-Tropsch step are optionally subjected to molecular redistribution to produce additional ethane and a C5+ fraction or dehydrogenated to form an additional feedstock for the oligomerization step. The distillate fuels formed in this process have relatively high octane and/or cetane values and also have low levels of sulfur and nitrogen impurities. The process is advantageous with respect to other processes because it requires significantly less hydrogen, and can be operated at considerably lower temperatures and pressures.</p> |
