Shell Oil Comapny

Basell Polyolefine Gmbh

Basell Technology Company B.v.

Andrew David Horton

Peter A Schut

Jan F Van Baar

Klaas Lambertus Von Hebel

Tiziano Dall'Occo

Gerard M M Van Kessel

Bart Johan Ruisch

Johan Stapersma

Maurizio Stefano Galimberti

Arie Van Zon

Timothy Michael Nisbet

Peter Anton August Klusener

Aart Bartus Van Oort

Eric Kragtwijk

Jan De With

Henderikus Hyacinthus Deuling

Minne Boelens

Anthonius Johannes Maria Breed

Max Van De Pas

Henri H Deuling

Eric J M De Boer

The invention relates to a process for the liquid phase oxidation of ethylbenzene into ethylbenzene hydroperoxide, wherein the ethylbenzene hydroperoxide concentration is kept below 20 wt. % on the basis of the total weight of the reaction mixture, and wherein styrene and/or a styrene derivative is fed to the ethylbenzene. The concentration of said styrene and/or a styrene derivative may be from 0.01 to 5.0 wt. %.

Process for the liquid phase oxidation of ethylbenzene into ethylbenzene hydroperoxide

A process for preparing styrene by contacting a gaseous feed which contains 1-phenylethanol and at least 0.1% wt of phenol and/or ethylphenol with a heterogeneous dehydration catalyst in the presence of at least 0.40% wt of benzylalcohol and at a molar ratio of benzylalcohol to total amount of phenol and ethylphenol of at least 0.8.

Process for preparing styrene

A process for polymerizing ethylene comprising contacting under polymerization condition ethylene and optionally one or more olefins with a catalyst system obtainable by contacting: a bis amido compound of formula (I) wherein Y is Si, Ge and Sn; X is hydrogen, halogen or an hydrocarbon radical; R, R, R, R, Rand R, are hydrocarbon radical; Q is a neutral Lewis base; and m is 0&#x2013;2; one or more boron activating cocatalysts and one or more aluminum alkyls or alumoxanes.

Process for the preparation of ethylene polymers

A catalyst system for the polymerization of olefins comprising the product obtained by contacting:

Catalyst system and process for the polymerization of olefins

A process for preparing propylene polymer comprising contacting, under polymerization conditions, propylene and optionally ethylene, with a catalyst system comprising a bridged metallocene and a suitable activating cocatalyst, said process being characteized by reducing the concentration of hydrogen formed during the polymerization reaction.

Propylene polymers and process for the preparation thereof

Catalysts for the polymerization of olefins are disclosed, which comprise the product obtained by contacting: (A) a bridged and/or substituted cyclopentadienyl compound of titanium, zirconium or hafnium; (B) an organometallic aluminium compound of the formula: Al(CH &mdash;CR R &mdash;CR R R ) R H wherein R is a C -C alkyl, alkenyl, or arylalkyl group; R is hydrogen or a C -C alkyl, alkenyl, or arylalkyl group; R and R are C -C alkyl, alkenyl, aryl, arylalkyl or alkylaryl groups; R is hydrogen or a C -C alkyl, alkenyl, aryl, arylalkyl or alkylaryl group; R is a C -C alkyl, alkenyl, or arylalkyl group, a carbon atom in the compound of formula (II) being optionally replaced by a Si or Ge atom; w is 1-3, z is 0 or 1, q&equals;3&minus;w&minus;z, and (C) water; the molar ratio (B)/(C) being comprised between 1:1 and 100:1. These catalysts show an improved activity with respect to known catalysts, wherein different aluminium compounds are used.

Catalysts and processes for the polymerization of olefins

Catalysts for the polymerization of olefins are disclosed, comprising the product obtainable by contacting: (A) a bridged and/or substituted cyclopentadienyl compound of Ti, Zr or Hf; (B) one or more organometallic aluminium compounds of formula (II): AlR H wherein the substituents R , same or different from each other, are linear or branched, saturated or unsaturated C -C alkyl or alkylaryl radicals, optionally containing Si or Ge atoms, wherein at least one of the substituents R is different from a straight alkyl group; z is 0 or 1; and (C) water, the molar ratio between the organometallic aluminium compound and water being comprised between 1:1 and 100:1; said catalyst being obtainable by a process comprising the following steps: (i) contacting component (A) with part of component (B) in the absence of component (C); (ii) contacting part of component (B) with component (C) in the absence of component (A) and successively (iii) contacting the products obtained in steps (i) and (ii).

Catalysts for the polymerization of olefins and process for the preparation thereof

It is disclosed a new catalyst system for the polymerization of olefins comprising the product obtainable by contacting the following components: (A) one or more compounds of a late transition metal belonging to Group 8-11 of the Periodic Table; and (B) the reaction product of water with one or more organometallic aluminum compounds of formula (IV): Al(CH &mdash;CR R R ) R H , wherein R is a C -C alkyl, C -C cycloalkyl or C -C alkylaryl radical; R is different from a straight alkyl and is a C -C alkyl, C -C cycloalkyl, C -C aryl, C -C alkylaryl or C -C arylalkyl radical; or R and R form together a C -C ring; R is hydrogen or a C -C alkyl, C -C aryl, C -C alkylaryl or arylalkyl radical; R is a C -C alkyl, C -C cycloalkyl, C -C aryl, C -C alkylaryl or C -C arylalkyl radical; x is 1-3; z is 0-1; and y is 3&minus;x&minus;z; the molar ratio between said organometallic aluminum compound and water being comprised between 0.5:1 and 100:1.

Catalyst system for olefin polymerization

Catalyst system for &agr;-olefin oligomerization

A catalyst composition comprising a bis-amide compound represented by the formula ##STR1## wherein M is zirconium, hafnium or titanium; each N is a three coordinate nitrogen atom; each e is Si, Ge or Sn; each Z is, independently, a hydride or R; each R is, independently, a hydrocarbyl one or more carbon atoms of which may be substituted by an element selected from Si, O, P, N and S; L is a neutral Lewis base and m is a number from 0 to 2; or a dimer thereof and a second component. Preferably the second component is a compound which is capable of providing a bulky and labile anion �A!.sup.-, which anion is substantially non-coordinating under the reaction conditions and contains at least one boron atom. Also provided is a process for oligomerizing or co-oligomerizing alpha olefins in the presence of this catalyst composition.

Growing community of inventors

Amsterdam, Netherlands

Andrew David Horton