| 摘要 |
<p>The specification describes a method for producing gasoline blendstock. A naphtha (3) is produced by contacting synthesis gas (1) with a catalyst (2) comprising cobalt supported on a ZSM-5 type zeolite at a temperature in the range from 220 °C to 280 °C. The naphtha is fractionated (4) to remove butane (5) and hydrocarbons boiling in excess of 174 °C (6). Normal paraffins contained in the fractionated naphtha (7) are isomerised (8) to produce a gasolene blendstock. An isomerisation process disclosed comprises separating the normal paraffins from the iso-paraffins (12) contained in the fractionated naphtha by selectively absorbing the normal paraffins on a zeolite molecular sieve (11), desorbing the normal paraffins with hydrogen (13) and passing the so formed stream of hydrogen and normal paraffins (14) over an acidic, metal-loaded molecular sieve (15).</p> |
