1
James R Sweet, Tan Jen Chen, Charles P Darnell: Membrane process for increasing conversion of catalytic cracking or thermal cracking units (LAW011). Exxon Research & Engineering Company, Joseph J Allocca, James H Takemoto, June 3, 1997: US05635055 (44 worldwide citation)

The yield and quality of products secured from cracking units is increased by the process of subjecting the product stream secured from such cracking unit to a selective aromatics removal process and recycling the recovered aromatics lean (saturates rich) stream to the cracking unit whereby such sat ...


2
Tan Jen Chen, James R Sweet: Integrated solvent extraction/membrane extraction with retentate recycle for improved raffinate yield. Exxon Research and Engineering Company, Joseph J Allocca, June 9, 1992: US05120900 (27 worldwide citation)

Raffinate yield from solvent extraction is improved when the extract phase recovered from the solvent extraction process is subjected to a membrane separation step wherein a saturates/1-ring aromatics rich retentate is produced and a 2+ ring aromatics rich permeate are produced and the saturates/1-r ...


3
James R Sweet: Membrane assisted settling process. Exxon Research and Engineering Company, Joseph J Allocca, December 18, 1990: US04978454 (18 worldwide citation)

A method for separating mixtures into a first fraction and a second fraction employing a combination of settling, ultrafiltration and permeate/retentate recycle to the settling zone is disclosed. A multi component feed stream is fed to a settling zone wherein it is permitted to separate into two maj ...


4
Tan Jen Chen, James R Sweet: Selective multi-ring aromatics extraction using a porous, non-selective partition membrane barrier. Exxon Research & Engineering Company, Joseph J Allocca, September 3, 1991: US05045206 (15 worldwide citation)

Multi-ring aromatic hydrocarbons and/or toxins are selectively solvent extracted from hydocarbon feed streams by the process comprising contacting the aromatics and/or toxins containing hydrocarbon stream with one side of a porous, non-selective partition barrier membrane while simultaneously contac ...


5
Tan Jen Chen, James R Sweet: Iso/normal paraffin separation by membrane extraction. Exxon Research & Engineering Company, Joseph J Allocca, April 21, 1992: US05107059 (14 worldwide citation)

Non-normal, branched paraffins (isoparaffins) are separated from hydrocarbon feeds comprising mixtures of isoparaffins and normal paraffins by the procedure involving the steps of contacting the hydrocarbon feed with one face of a non-selective, microporous partition barrier membrane while simultane ...


6
Tan Jen Chen, James R Sweet: Selective separation of naphthenes from paraffins by membrane extraction. Exxon Research and Engineering Company, Joseph J Allocca, April 21, 1992: US05107056 (13 worldwide citation)

Naphthenic hydrocarbons are separated from aliphatic rich hydrocarbon feeds comprising mixtures of naphthenes with paraffinic hydrocarbons by a membrane extraction process whereby the hydrocarbon feed is contacted with one face of a porous, non-selective partition barrier membrane while simultaneous ...


7
James R Sweet: Pressure induced surfactant recovery during ultrafiltration of water-oil emulsions. Exxon Research and Engineering Company, Joseph J Allocca, January 9, 1990: US04892660 (13 worldwide citation)

Surfactants present in water/oil/surfactant emulsions can be selectively separated from the emulsions by practicing an ultrafiltration process under specific conditions of pressure and ultrafiltration membrane pore size. It has been discovered that increasing the applied pressure results in an incre ...


8
Tan Jen Chen, James R Sweet: Olefin/paraffin separation via membrane extraction. Exxon Research and Engineering Company, Joseph J Allocca, April 21, 1992: US05107058 (10 worldwide citation)

Olefins are selectively separated from hydrocarbon feeds containing mixtures of olefins and paraffins by contacting said hydrocarbon feed mixture with one side of a micro-porous, non-selective partition barrier membrane while simultaneously passing, preferably in countercurrent flow, along the oppos ...


9
Tan Jen Chen, James R Sweet: Intergrated membrane pre-extraction/solvent extraction of distillates. Exxon and Research and Engineering Company, Joseph J Allocca, March 10, 1992: US05095170 (3 worldwide citation)

The yield, raffinate product quality, and throughput of the selective solvent extraction of hydrocarbon feeds is improved by subjecting the hydrocarbon feeds from which aromatic hydrocarbons are to be selectively solvent extracted to a membrane separation process which selectively permeates aromatic ...


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