Exxonmobil Chemical Patents Inc.

Exxonmobil Research and Engineering Company

Pramod Jayant Nandapurkar

Norman Yang

Craig Janzen Emett

Anatoly Ilich Kramer

Jian Yang

Mark Paul Hagemeister

Patrick C Chen

Jennifer L Rapp

Phil Surana

Mark H Li

Najeeb M Kuzhiyil

Brian H Wahn

Margaret M Wu

Bruce Alan Harrington

Phillip Thomas Matsunaga

Chon-Yie Lin

Kevin Bruce Stavens

Charles James Ruff

Wenning W Han

Shakeel H Tirmizi

Babak LotfizadehDehkordi

Maria Caridad Brillantes Goze

Maria C B Goze

Babak Lotfizadehdehkordi

Shakeel Tirmizi

In at least one embodiment, a process to produce a poly alpha-olefin (PAO) includes introducing a first alpha-olefin to a first catalyst system comprising activator and a metallocene compound into a continuous stirred tank reactor or a continuous tubular reactor under first reactor conditions to form a first reactor effluent. The first alpha-olefin is introduced to the reactor at a flow rate of about 100 g/hr or more. The first reactor effluent includes at least 60 wt % of PAO dimer and 40 wt % or less of higher oligomers, where the higher oligomers are oligomers that have a degree of polymerization of 3 or more. The process includes introducing the first reactor effluent and a second alpha-olefin to a second catalyst composition including an acid catalyst in a second reactor to form a second reactor effluent comprising PAO trimer.

Processes to produce poly alpha-olefin trimer and apparatus therefor

Disclosed is a lubricant base stock blend comprising a PAO base stock and an alkylated aromatics (AA) base stock, wherein at least the longer portion of the pendant groups attached to the carbon backbones of the PAO molecules have comparable length to at least the longer portion of the side chain groups attached to the aromatic ring structure of the AA molecules. The comparable lengths of at least the longer portion of the pendant groups and the side chain groups lead to enhanced improvement in oxidation stability of the blend.

Lubricant base stock blends

The invention is directed to a process for the preparation of lubricant base stocks by contacting alphaolefin feedstocks with single-site metallocene catalysts and recycling unconverted monomers, characterized by a purge step in the recycle.

Utilization of linear alpha olefins in the production of metallocene catalyzed poly-alpha olefins

Poly alpha olefins (PAOs) are characterized by very low viscosity and excellent Noack volatility. A preferred process for synthesizing said PAOs involves first oligomerizing low molecular weight linear alpha olefins in the presence of a single site catalyst at high temperatures without adding hydrogen and then subsequently oligomerizing at least a portion of the product from the first step in the presence of an oligomerization catalyst.

Poly alpha olefin compositions

The invention relates to a method of making a PAO characterized by a low viscosity, low Noack volatility, and excellent cold temperature properties, using a promoter system comprising an alcohol and an ester. The products comprise trimers obtained by fractionating a hydrogenated bottoms product from an oligomerization process using said promoter system.

Method of making low viscosity PAO

The invention relates to a method of making a PAO from mixtures comprising 1-decene and 1-dodecene, characterized by a low viscosity and excellent cold temperature properties, using a promoter system comprising an alcohol. In embodiments, the product has properties similar to those obtainable using a feed of solely 1-decene.

Low viscosity polyalphapolefin based on 1-decene and 1-dodecene

This invention relates to the use of 1-decene/1-dodecene olefin mixture to produce high viscosity polyalphaolefins (PAOs) having a viscosity of from about 40 cSt to about 100 cSt at 100&#xb0; C. (ASTM D-445) and a number average molecular weight of between about 1200 to about 4000, particularly useful as lubricant base stocks.

High viscosity PAOs based on 1-decene/1-dodecene

This invention relates to the use of olefin mixtures containing 1-hexene/1-decene/1-dodecene and, additionally, 1-octene or 1-decene to produce high viscosity polyalphaolefins (PAOs) having a viscosity of from about 40 cSt to about 100 cSt at 100&#xb0; C. (ASTM D-445) and a number average molecular weight of between about 1200 to about 4000, particularly useful as lubricant base stocks.

High viscosity polyalphaolefins based on 1-hexene, 1-dodecene and 1-tetradecene

Disclosed herein is a method of making a PAO using tetradecene and particularly mixtures comprising 1-hexene, 1-decene, 1-dodecene, and 1-tetradecene, characterized by a low viscosity and excellent cold temperature properties, using a promoter system comprising an alcohol and an ester. In embodiments, the product has properties similar to those obtainable using a feed of solely 1-decene.

Low viscosity PAO based on 1-tetradecene

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Plainsboro, NJ, United States of America

Pramod Jayant Nandapurkar