| 摘要 |
In a continuous process for upgrading lower olefin feedstock to higher hydrocarbons including the steps of combining olefinic feedstock with a pressurized liquid diluent stream comprising C5+ olefins, contacting the diluted feedstock with a shape selective medium pore acid zeolite catalyst under reaction conditions at elevated temperature in a pressurized reactor zone to convert olefins and recover reactor effluent at reaction conditions; an improvement has been found which comprises: heating and separating reactor effluent in a primary phase separation zone to vaporize light and middle distillate hydrocarbon components into a first vapor phase stream and recover a heavy liquid stream from the primary separation zone, said heavy liquid stream containing at least 50% of those C20+ hydrocarbons recovered in the reactor effluent; condensing a portion of the first vapor phase stream by cooling and recovering the dominant portion of a liquid olefinic recycle stream for combining with the feedstock, said recycle stream comprising a major portion of C6 to C18 hydrocarbons recovered in the reactor effluent; and further fractionating the heavy liquid stream from the primary separation zone to obtain a major lubricant product stream consisting essentially of substantially linear C20+ aliphatic hydrocarbons.
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