King Abdulaziz City for Science and Technology

International Business Machines Corporation

Oxford University Innovation Limited

Hamid A Almegren

James L Hedrick

Phillip Joe Brock

Daniel Joseph Coady

Fares D Alsewailem

Kazuki Fukushima

Julia Elizabeth Rice

Hans Werner Horn

Tiancun Xiao

Peter P Edwards

Sami Al-Dress

Saud A Aldrees

Abdullah Al-Ghamdi

Mohammad C Al-Kinany

Eyad Al-Ghilan

Abdullah M Alabdulrahman

The invention provides a modified zeolite, a method of preparing the modified zeolite and a method of one cycle alkylating benzene in presence of one of an unmodified and modified zeolite catalyst. The modified zeolite catalyst includes zeolite with ratio of silica to alumina ranging between 5% to 95% of silica and 95% to 5% alumina, kaolinite and a binder, wherein the zeolite is modified with one or more metal oxides of Lanthanide-series of the Periodic Table. The method of alkylating benzene is one cycle process in presence of a catalyst that includes charging benzene and ethylene gas feedstock to an alkylation zone. Heated benzene and the ethylene gas feedstock are contacted in a fixed bed reactor in the alkylation zone. The catalyst for alkylating benzene is added in a catalyst zone of the fixed bed reactor.

Method of preparing a modified zeolite catalyst and preparing ethylbenzene using one cycle process

A method comprises forming a reaction mixture comprising a terephthalate polyester, a glycol comprising 2 to 5 carbons, and an amidine organocatalyst; and heating the reaction mixture at a temperature of about 120&#xb0; C. or more to depolymerize the terephthalate polyester, thereby forming a terephthalate reaction product comprising a monomeric dihydroxy terephthalate diester; wherein the terephthalate reaction product contains terephthalate oligomers in an amount less than the amount of terephthalate oligomers that would result from i) substituting the amidine organocatalyst with an equimolar amount of a guanidine catalyst and ii) depolymerizing the terephthalate polyester under otherwise identical reaction conditions.

Methods of depolymerizing terephthalate polyesters

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Riyadh, Saudi Arabia

Hamid A Almegren