CLOUD POINT IMPROVEMENT FOR PARTIAL CONVERSION HYDROCRACKING UNITS

摘要

Methods and apparatus for improving the cold flow properties of diesel are described. The methods include hydrocracking a hydrocarbon feed to provide a reactor effluent comprising a product mixture comprising diesel, kerosene, and naphtha, and unconverted feed. The reactor effluent is separated in an enhanced hot separator into an overhead vapor stream comprising the product mixture and a liquid bottoms stream comprising the unconverted feed. The overhead vapor stream is contacted with a dewaxing catalyst in a finishing reaction zone to convert a portion of n-paraffins in the product mixture to iso-paraffins. The effluent from the finishing reaction zone is separated in a high pressure separator into an overhead stream comprising gases and a liquid stream comprising the product mixture. The liquid stream from the high pressure separator is separated into at least a diesel stream in a fractionation zone.

主权项

1. A method of improving the cold flow properties of diesel comprising:
hydrocracking a hydrocarbon feed in a hydrocracking zone in the presence of a hydrocracking catalyst under hydrocracking conditions to provide a reactor effluent comprising a product mixture comprising diesel, kerosene, and naphtha, and unconverted feed; separating the reactor effluent in an enhanced hot separator into an overhead vapor stream comprising the product mixture and a liquid bottoms stream comprising the unconverted feed, the enhanced hot separator including a bed of packing; contacting the overhead vapor stream from the enhanced hot separator with a dewaxing catalyst in a finishing reaction zone to convert a portion of n-paraffins in the product mixture to iso-paraffins; separating an effluent from the finishing reaction zone in a high pressure separator into an overhead stream comprising gases and a liquid stream comprising the product mixture; and separating the liquid stream from the high pressure separator into at least a diesel stream in a fractionation zone.