NAI YUEN CHEN
Engineering in Titusville, NJ

4749467, Jun 7, 1988

May 22, 1987

7/054115

Nai Y. Chen - Titusville NJ
Bruce P. Pelrine - Lawrenceville NJ

Mobil Oil Corporation - New York NY

L10G 6510

208 59

An improved method which provides for an extended cycle length in catalytic lube dewaxing of residual lube oil feedstocks and easier catalyst regeneration. The method may incorporate catalytically dewaxing a feedstock in a fixed bed reactor with or without product recycle, or a series of reactors with interreactor separation of vapors from liquids. Improved performance is achieved by operating the reactor at a temperature between about 490. degree. and about 620. degree. F. , employing a high activity crystalline zeolite catalyst having an alpha value between about 50 and about 900 based on the zeolite and a space velocity sufficiently low to produce a dewaxed effluent of desired pour point and to maintain an average catalyst aging rate of less than about 2. degree. F. per day. This relatively low temperature operation allows catalyst performance to be restored by simple hydrogen reactivation.

4814543, Mar 21, 1989

Dec 28, 1987

7/138749

Nai Y. Chen - Titusville NJ
William E. Garwood - Haddonfield NJ
Sharon B. McCullen - Newtown PA

Mobil Oil Corporation - New York NY

C07C 513

585739

The present invention includes a process and catalyst composition for paraffinic isomerization of a hydrocarbon feedstock which has a paraffin content having no more than 20 carbon atoms per molecule. The feedstock is contacted with a crystalline aluminosilicate zeolite catalyst having pore openings defined by: (1) a ratio of sorption of n-hexane to o-xylene, on a volume percent basis, of greater than about 3, which sorption is determined at a P/P. sub. o of 0. 1 and at a temperature of 50. degree. C. for n-hexane and 80. degree. C. for o-xylene and (2) by the ability of selectively cracking 3-methylpentane (3MP) in preference to the doubly branched 2,3-dimethylbutane (DMB) at 1000. degree. F. and 1 atmosphere pressure from a 1/1/1 weight ratio mixture of n-hexane/3-methyl-pentane/2,3-dimethylbutane, with the ratio of rate constants k. sub. 3MP/ k. sub. DMB determined at a temperature of 1000. degree. F.

4443325, Apr 17, 1984

Dec 23, 1982

6/452482

Nai Y. Chen - Titusville NJ
Lillian A. Rankel - Princeton NJ

Mobil Oil Corporation - New York NY

C10B 5510, C10G 6518

208 55

A combined process for treating heavy hydrocarbon feedstocks, such as resids that minimizes coke production and maximizes naphtha production, comprising the steps of thermally treating the feedstocks, in the absence of an added catalyst and either with or without hydrogen and steam, at a temperature of at least about 750. degree. F. (399. degree. C. ) and under a pressure greater than about 400 psig to create significant chemical transformations without causing phase separation and consequent formation of sludge or a coke deposit; topping the thermally treated product to produce a distillate fraction and a bottoms fraction; coking the bottom fraction to produce gas, liquid products, and coke; and finally catalytically cracking the combined distillate fraction and liquid products to recover gas, gasoline, and light distillate products.

4668377, May 26, 1987

Oct 21, 1985

6/789608

Nai Y. Chen - Titusville NJ
Bruce P. Pelrine - Lawrenceville NJ

Mobil Oil Corporation - New York NY

C10G 1105, C10G 4716

208111

A process for dewaxing lube basestocks over low acidity dewaxing catalysts can be undertaken at steady state temperature. In a preferred embodiment, the feedstock is subjected to catalytic dewaxing with concommident removal of gaseous product. When high boiling feed with end points above 1000. degree. F. , such as heavy neutrals and bright stocks, and waxy feeds containing more than 20 wt % wax are subject of the process, it is preferred to use continuously stirred tank reactors.

4808296, Feb 28, 1989

Feb 24, 1987

7/018112

Nai Y. Chen - Titusville NJ
Dennis E. Walsh - Richboro PA

Mobil Oil Corporation - New York NY

C10G 4720, C10G 4554

208111

The present invention is a catalyst composition and method for dewaxing a wax-containing hydrocarbon feedstock which includes a zeolite characterized by a silica-to-alumina ratio from about 12 to about 200, a Constraint Index of from about 1 to about 12, and an alpha value of not more than about 50, in combination with a Group VIII metal hydrogenation-dehydrogenation component.

4933283, Jun 12, 1990

Nov 12, 1987

7/120681

Nai Y. Chen - Titusville NJ
Leonard R. Koenig - Trenton NJ

Mobil Oil Corporation - New York NY

C12P 500, C12P 708, C12P 710, C07C 100

435166

Cellulosic materials are converted to hydrocarbons by hydrolyzing cellulosic materials to produce a mixture of fermentable sugars and unfermentable furfural, fermenting the mixture to obtain a fermented mixture containing fermented product and unfermented furfural and contacting the fermented mixture with a highly siliceous crystalline zeolite catalyst under conditions of temperature and pressure to convert the fermented mixture to a hydrocarbon-containing product. Preferably, an oxygenated organic compound such as methanol, ethanol or dimethylether is mixed with the fermented mixture prior to contact with the catalyst.

4877581, Oct 31, 1989

Sep 1, 1988

7/239257

Nai Y. Chen - Titusville NJ
Dennis E. Walsh - Richboro PA

Mobil Oil Corporation - New York NY

C07C 513

585751

A paraffin conversion process for hydroisomerizing a nitrogen and wax-containing hydrocarbon feedstock comprising contacting the feedstock with a catalyst including a ZSM-11 zeolite characterized by an alpha value from about 10 to 50, in combination with a Group VIII metal hydrogenation-dehydrogenation component of platinum or palladium at a temperature of about 400. degree. F. to about 850. degree. F. and at a pressure of from about 200 to about 2000 psig.

4259174, Mar 31, 1981

Mar 19, 1979

6/021735

Nai Y. Chen - Titusville NJ
William E. Garwood - Haddonfield NJ

Mobil Oil Corporation - Fairfax VA

C10G 104, C10G 1105, C10G 2100, C10G 4716

208111

Hydrocarbon oils, especially waxy distillate lubricating oil stocks suitable for the preparation, by conventional unit processes, of high V. I. , low pour point lubricating oils, are advantageously catalytically dewaxed with synthetic offretite catalyst preferably associated with a hydrogenation metal such as platinum or palladium.

4983274, Jan 8, 1991

Oct 6, 1988

7/254069

Nai Y. Chen - Titusville NJ
Thomas F. Degnan - Yardley PA
Paul B. Weisz - Yardley PA

Mobil Oil Corp. - Fairfax VA

C10G 1100

208111

The catalytic properties of a metal-containing shape selective crystalline silicate zeolite are significantly improved by converting said metal to an intermetallic compound. Thus, for example, zeolite beta containing the intermetallic component platinum zeolite demonstrates improved catalytic properties for dewaxing a hydrocarbon feedstock compared to zeolite beta containing platinum metal alone.

4100218, Jul 11, 1978

May 31, 1977

5/801713

Nai Yuen Chen - Titusville NJ
Werner O. Haag - Lawrenceville NJ

Mobil Oil Corporation - New York NY

C07C 1502, C07C 1104, C10G 3702

260673

Ethane is converted to LPG and gasoline and/or aromatics concentrate in a combination process which comprises directly passing olefin effluent from the thermal cracking of ethane over a special crystalline aluminosilicate zeolite of the ZSM-5 type and recovering aromatics and C. sub. 3 + hydrocarbons. For best yields, the thermal cracking step is conducted under more severe conditions than are used when ethylene production is optimized. The second, olefin conversion step is carried out at either the same pressure as the cracking step or higher. The process is of particular interest where low cost ethane is available.