Badger Licensing LLC

Stone & Webster, Inc.

Deltech Corporation

Exxonmobil Chemical Patents Inc.

Raytheon Engineers & Constructors, Inc.

Joseph C Peters

Shyh-Yuan Henry Hwang

Shiou-Shan Chen

Chung-Ming Chi

Ronald Birkhoff

Richard F Guarino

J Erik Moy

Michael C Clark

Maruti Bhandarkar

Vijay Nanda

Brian Maerz

Slawomir A Oleksy

Dana E Johnson

Sanjeev Ram

Shyh-Yuan Hwang

Kevin J Fallon

Francis A Demers

Maruti Bhandakar

Lionel C Allmand

Shyh-Yuan H Hwang

A process is disclosed for alkylating benzene contained in a benzene-containing refinery gasoline stream also comprising at least 0.1 wt % of at least one C6 to C8 olefin. In the process, the refinery gasoline stream is contacted under alkylation conditions with an alkylating agent selected from one or more C2 to C5 olefins in at least a first alkylation reaction zone and a second alkylation reaction zone connected in series to produce an alkylated effluent, which has reduced benzene content as compared with said refinery gasoline stream. All of the refinery gasoline stream is introduced into the first alkylation reaction stage, whereas an aliquot of the alkylated effluent is recycled and introduced to the second, but not the first, alkylation reaction zone.

Process for reducing the benzene content of gasoline

In a process for alkylating benzene contained in a benzene-containing refinery gasoline stream, the benzene-containing refinery gasoline stream is contacted with an alkylating agent selected from one or more C2 to C5 olefins in at least one alkylation reaction zone under alkylation conditions to produce an alkylated effluent which has reduced benzene content as compared with said refinery gasoline stream and is essentially free of said alkylating agent. An aliquot of the alkylated effluent is then recycled to the one at least one alkylation reaction zone such that the molar ratio of alkylatable aromatic compounds to said alkylating agent in the combined refinery gasoline and recycle streams introduced into the at least one alkylation reaction zone is at least 1.0:1.

A process is described for producing cumene comprising contacting a feed stream comprising benzene and a further feed stream comprising isopropanol or a mixture of isopropanol and propylene in the presence of an alkylation catalyst comprising at least a molecular sieve of the MCM-22, family in an alkylation zone under alkylation conditions of at least partial liquid phase and with a water concentration in the liquid phase of at least 50 ppm to react at least part of said isopropanol and benzene to produce an effluent stream containing cumene.

Process for producing cumene

A method of measuring the level of an impurity in a gas comprises providing a gas detection tube having a internal volume containing a reagent which can react with said impurity to produce a compound capable of producing a color change in said tube such that the extent of the color change is proportional to the concentration of the impurity in said gas. A volume of the gas at least 1&#xd7;10times the test volume of the gas detection tube is passed through the tube and the extent of the color change of the detector element is measured.

Detection of impurities in gas streams

A process is described for producing an alkylaromatic compound, in which a first feed comprising an alkylatable aromatic compound and a second feed comprising an alkene are introduced into a first alkylation reaction zone comprising a first alkylation catalyst. The first alkylation reaction zone is operated under conditions effective to cause alkylation of the alkylatable aromatic compound by the alkene to produce said alkylaromatic compound, the conditions being such that the alkylatable aromatic compound is at least predominantly in the vapor phase. A first effluent comprising the alkylaromatic compound and unreacted alkylatable aromatic compound is withdrawn from the first alkylation reaction zone and at least part of the unreacted alkylatable aromatic compound is treated to remove catalyst poisons therefrom and produce a treated unreacted alkylatable aromatic stream. At least part of the unreacted alkylatable aromatic compound and a third feed comprising said alkene is introduced into a second alkylation reaction zone comprising a second alkylation catalyst. The second alkylation reaction zone is operated under conditions effective to cause alkylation of the unreacted alkylatable aromatic compound by the alkene to produce said alkylaromatic compound, the conditions being such that the alkylatable aromatic compound is at least predominantly in the liquid phase. A second effluent comprising said alkylaromatic compound is withdrawn from the second alkylation reaction zone.

Alkylaromatics production

A method and apparatus are disclosed for regenerating and/or stabilizing the activity of a dehydrogenation catalyst used in dehydrogenating an alkylaromatic hydrocarbon to obtain an alkenylaromatic hydrocarbon, the method comprising the steps of continuously or intermittently adding to a reactant stream an effective amount of an alkali metal or alkali metal compound without interrupting the dehydrogenation reaction.

Method and apparatus for regeneratinig and stabilizing dehydrogenation

This invention relates to a vapor phase process for the production of an alkyl styrene by the catalytic dehydrogenation of tertiary butylethylbenzene in the presence of catalysts containing iron oxides under conditions which minimize the undesirable thermal degradation of the raw material and the product while maintaining good yield and selectivity with low production of by-products. Specifically, it has been discovered that these desired results may be obtained by conducting the subject reaction at relatively low temperatures of between about 1000.degree. F. and about 1100.degree. F. and by maintaining a low partial pressure (i.e., not greater than about 0.5 psi) of the alkyl ethylbenzene in the reaction mixture. The desired partial pressure of the alkyl ethylbenzene is obtained by carrying out the catalytic reaction at a pressure of between about 1 psia and about 30 psia with steam as a diluent, the weight ratio of steam to alkyl ethylbenzene being between about 3 and about 30.

Process for dehydrogenation of alkyl aromatic compounds

The present invention provides an alkylation process which is highly selective towards the production of para-tertiarybutylethylbenzene in high yield and in high para isomer content, while minimizing the development of unwanted by-products and impurities during the alkylation reaction. In accordance with the process, a feed stream mixture comprising the olefin alkylating agent and a molar excess of an aromatic hydrocarbon substrate is introduced into the inlet of a reactor zone and through a bed of active zeolite alkylation catalyst under alkylation conditions such that substantially all of the olefin reacts with the aromatic substrate to produce a mixture comprising the alkylated product and unreacted aromatic compound. This mixture is continuously withdrawn from the reactor zone as reactor effluent, after which the effluent is split into a product stream and recycle stream. The recycle stream is continuously recirculated back into the inlet of said reactor zone, preferably after being first combined with fresh feed stream mixture, in an amount such that the quantity of said aromatic compound and said olefin present in said reaction zone prior to contact with said catalyst is maintained at a preferred mole ratio greater than 10 to 1.

Process for the production of tertiary butylethylbenzene

Growing community of inventors

Quincy, MA, United States of America

Joseph C Peters