发明名称 |
Lubricating oil dewaxing with membrane separation of cold solvent |
摘要 |
A process for solvent dewaxing petroleum feedstock to separate crystallized wax from lubricant oil by filtration of a wax/oil/solvent mixture. The feedstock is sequentially cooled and mixed with cold polar solvent to form a wax crystal phase and oil-solvent phase, and-the oil-solvent filtrate stream is contacted with solvent permeable selective membrane at low temperature to recover an internal circulating permeate solvent stream and an oil-rich retentate stream containing dewaxed oil product and residual solvent. Improved operation is achieved by splitting the internal circulating solvent stream into a multiple cold solvent recycle streams and injecting a plurality of the cold solvent recycle streams into the waxy petroleum feedstock during sequential cooling and mixing. By initially injecting a cold recycle solvent stream in to the waxy petroleum feedstock at a small temperature differential near the wax crystallization temperature, shock cooling and excess small wax crystal formation is avoided.
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申请公布号 |
US5494566(A) |
申请公布日期 |
1996.02.27 |
申请号 |
US19940249610 |
申请日期 |
1994.05.26 |
申请人 |
MOBIL OIL CORPORATION |
发明人 |
GOULD, RONALD M.;NITSCH, ALBERT R. |
分类号 |
C10G73/06;C10G73/12;C10G73/22;C10G73/32;C10G73/34;(IPC1-7):C10G73/06 |
主分类号 |
C10G73/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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