Joseph L Feimer, Tan Jen Chen, Dean L Smith Jr, Donald T Bray, Deborah de la Cruz: Spiral wound element for separation. Exxon Research & Engineering Co, Joseph J Allocca, January 4, 1994: US05275726 (103 worldwide citation)

An improved spiral wound element for separations is disclosed wherein the improvement comprises using as the feed/retentate space one or more layers of a material having an open cross-sectional area in the range 30 to 70% and as the permeate spacer material at least three layers of material two of w ...

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 ...

Guang Cao, Luc R M Martens, Jeffrey L White, Tan Jen Chen, Matu J Shah: Zeolite catalyst activity enhancement by aluminum phosphate and phosphorus. Exxon Chemical Patents, James A Zboray, June 27, 2000: US06080303 (43 worldwide citation)

The present invention provides a process for improving the catalytic activity of small and medium pore acidic zeolite catalyst which comprises the steps of treating a zeolite with a phosphorus compound to form a phosphorus treated zeolite and combining the phosphorus treated zeolite with AlPO.sub.4. ...

Roby Bearden Jr, Tan Jen Chen, William N Olmstead: Integrated coking-gasification process with mitigation of bogging and slagging. Exxon Research & Engineering Company, Henry E Naylor, March 10, 1992: US05094737 (43 worldwide citation)

A fluid coking-gasification process for converting heavy hydrocarbonaceous chargestocks to lower boiling products in which calcium silicate is used to mitigate bogging, slagging, or both. The calcium silicate can be added directly to the heavy hydrocarbonaceous chargestock to mitigate both bogging a ...

Gary David Mohr, Tan Jen Chen, Kenneth Ray Clem, Mechilium Johannes Geradus Janssen, Phillip Andrew Ruziska, Johannes Petrus Verduijn, Jannetje Maatje van den Berge: Hydrocarbon conversion process using a zeolite bound zeolite catalyst. Exxon Chemical Patents, Edward F Sherer, November 30, 1999: US05993642 (41 worldwide citation)

There is provided a process for converting hydrocarbons which utilizes a zeolite bound zeolite catalyst that has enhanced performance when utilized in hydrocarbon conversion processes, e.g., catalytic cracking, alkylation, disproportionation of toluene, isomerization, and transalkylation reactions. ...

Tan Jen Chen, Luc Roger Marc Martens: Sequential catalytic and thermal cracking for enhanced ethylene yield. Exxon Chemical Patents, March 7, 2000: US06033555 (30 worldwide citation)

The invention provides a process for improving the conversion of a hydrocarbon feedstock to light olefins comprising the steps of first contacting the hydrocarbon feedstock with a light olefin producing cracking catalyst and subsequently thermally cracking the unseparated stream to produce additiona ...

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 ...

Javier Agundez Rodriguez, Joaquin Perez Pariente, Antonio Chica Lara, Avelino Corma Canos, Tan Jen Chen, Philip A Ruziska, Brian Erik Henry, Gordon F Stuntz, Stephen M Davis: Catalytic silicoaluminophosphates having an AEL structure, and their use in catalytic craking. ExxonMobil Chemical Patents, October 23, 2001: US06306790 (26 worldwide citation)

Disclosed are silicoaluminophosphates (SAPOs) having unique silicon distributions, a method for their preparation and their use as catalysts for the catalytic cracking of hydrocarbon feedstocks. More particularly, the new SAPOs have a high silica: alumina ratio, and are prepared from microemulsions ...

James Sweet Sweet, Tan Jen Chen, Charles P Darnell: Membrane process for enhanced distillate or hydrotreated distillate aromatics reduction. Exxon Research and Engineering Company, Joseph J Allocca, James H Takemoto, July 1, 1997: US05643442 (23 worldwide citation)

Distillate or hydrotreated distillate effluent is separated into an aromatics rich permeate and an aromatics lean retentate by use of a permselective membrane with the aromatic rich permeate being sent to a hydrotreater, thereby increasing the quantity of reduced aromatics content product.

Tan Jen Chen, Philip A Ruziska, Gordon F Stuntz, Paul K Ladwig: Multiple feed process for the production of propylene. ExxonMobil Chemical Patents, C L Bell, January 15, 2002: US06339181 (21 worldwide citation)

This invention relates to a process to produce propylene from a hydrocarbon feed stream, preferably a naphtha feed stream, comprising C5 and C6 components wherein a light portion having a boiling point range of 120° C. or less is introduced into a reactor separately from the other components of the ...