Edward A Burt

US Patent:

55697461, Oct 29, 1996

Filed:

Jan 23, 1995

Appl. No.:

8/376973

Inventors:

John Y. Lee - Baton Rouge LA
Edward A. Burt - Baton Rouge LA

Assignee:

Albemarle Corporation - Richmond VA

International Classification:

C07F 500
C07F 1700
C07F 700

US Classification:

534 11

Abstract:

A process for making a metallocene, said process comprising the steps of (a) reacting an alkylsubstituted cyclopentadiene ligand, which contains a mixture of endo- and exo-isomers, with up to about a 10% excess over a stoichiometric amount of a deprotonation agent based on the amount of endo-isomers, so as to form a salt of said endo-isomers, (b) reacting the endo-isomer salt with a transition or actinide metal compound so as to form said metallocene and (c) optionally separating said exo-isomers and trace amounts of unreacted endo-isomers from said metallocene by distillation.

US Patent:

56060874, Feb 25, 1997

Filed:

Apr 19, 1996

Appl. No.:

8/635358

Inventors:

John K. Roberg - Baton Rouge LA
Robert E. Farritor - Baton Rouge LA
Edward A. Burt - Baton Rouge LA

Assignee:

Albemarle Corporation - Richmond VA

International Classification:

C07F 506

US Classification:

556179

Abstract:

An improved process for making aluminoxanes by the addition of water to a solvent solution of a hydrocarbylaluminum compound and/or an aluminoxane feeds the water through an orifice which is surrounded by a flow of solvent which carries the water into the solvent solution of hydrocarbylaluminum compound and/or aluminoxane.

US Patent:

57393680, Apr 14, 1998

Filed:

May 10, 1996

Appl. No.:

8/644764

Inventors:

Niomi L. Krzystowczyk - Baton Rouge LA
Steven P. Diefenbach - Baton Rouge LA
Edward A. Burt - Baton Rouge LA

Assignee:

Albemarle Corporation - Richmond VA

International Classification:

C07F 506
C07F 1700

US Classification:

556187

Abstract:

Alumoxane, and especially methylalumoxane, which provide supported metallocene and/or transition metal catalyst compositions having increased activity are prepared by heating the alumoxane prior to placing it on the support.

US Patent:

55999646, Feb 4, 1997

Filed:

Apr 19, 1996

Appl. No.:

8/635310

Inventors:

John K. Roberg - Baton Rouge LA
Robert E. Farritor - Baton Rouge LA
Edward A. Burt - Baton Rouge LA

Assignee:

Albemarle Corporation - Richmond VA

International Classification:

C07F 506

US Classification:

556179

Abstract:

Aluminoxane is made by feeding water, hydrocarbylaluminum and organic solvent to a loop recycle reactor under conditions so as to react the water and hydrocarbylaluminum to form a hydrocarbylaluminoxane, removing a portion of the solvent and hydrocarbylaluminoxane from said reactor and recirculating the remaining portion of the reactor contents through a reaction zone where the water initially contacts the hydrocarbylaluminum. The feed rates of water, hydrocarbylaluminum and solvent to the reactor and the withdrawal rate of solvent and hydrocarbylaluminoxane from the reactor can be adjusted to produce a substantially steady state reaction.

US Patent:

53290542, Jul 12, 1994

Filed:

Jul 19, 1993

Appl. No.:

8/093166

Inventors:

Kevin J. Theriot - Baton Rouge LA
Niomi L. Krzystowczyk - Baton Rouge LA
Edward A. Burt - Baton Rouge LA
Lawrence H. Shepherd - Baton Rouge LA

Assignee:

Albemarle Corporation - Richmond VA

International Classification:

C07C 1724
C07C 1733
C07C 2513
C07C 2502

US Classification:

570142

Abstract:

Activated carboxylic acids and esters such as pentafluorobenzoic acid are rapidly decarboxylated in high yields by reacting the acid or ester with an alkanolamine reagent which catalyzes the reaction.

US Patent:

6034024, Mar 7, 2000

Filed:

Apr 29, 1998

Appl. No.:

9/069462

Inventors:

Niomi L. Krzystowczyk - Orangeburg SC
Steven P. Diefenbach - Baton Rouge LA
Edward A. Burt - Lexington SC

Assignee:

Albemarle Corporation - Richmond VA

International Classification:

B01J 3100
B01J 3700
B01J 3739
C08F 402
C08F 460

US Classification:

502107

Abstract:

A process is described which comprises heating a methylalumoxane solution in an aromatic hydrocarbon solvent at a temperature of at least 35. degree. C. for at least 0. 5 hour in an inert, dry atmosphere such that the resulting heat-treated composition provides, in a supported metallocene catalyst produced using the heat-treated composition, increased activity as compared to the same supported metallocene catalyst produced in the same way except for using a portion of the methylalumoxane solution that has not been heat-treated. Before the heating the methylalumoxane of the solution contains from about 5 to about 35 mole percent unreacted trimethylaluminum, and was formed by partial hydrolysis of trimethylaluminum with free water in an organic solvent.

US Patent:

56938381, Dec 2, 1997

Filed:

Nov 13, 1995

Appl. No.:

8/556479

Inventors:

Samuel A. Sangokoya - Baton Rouge LA
Lawrence H. Shepherd - Baton Rouge LA
Edward A. Burt - Baton Rouge LA

Assignee:

Albemarle Corporation - Richmond VA

International Classification:

C07F 506

US Classification:

556179

Abstract:

A aluminoxane product is prepared by reacting water which contains a stabilizing agent, such as a lithium halide, with a hydrocarbyl aluminum compound, such as trimethylaluminum, in an organic solvent.

US Patent:

56633947, Sep 2, 1997

Filed:

Jul 15, 1996

Appl. No.:

8/680087

Inventors:

John K. Roberg - Baton Rouge LA
Edward A. Burt - Baton Rouge LA

Assignee:

Albemarle Corporation - Richmond VA

International Classification:

C07F 506

US Classification:

556179

Abstract:

Water, hydrocarbylaluminum such as trimethylaluminum, and organic solvent such as toluene are fed to a reactor in controlled proportions and under temperature control to form a dilute reaction product mixture of specified composition and concentration. This solution is then processed so as to form at least two product mixtures, one of which is essentially aluminoxane-free hydrocarbylaluminum dissolved in organic solvent, and another of which is a concentrated solution of organoaluminum compounds composed in essence of hydrocarbylaluminum (e. g. trimethylaluminum) and hydrocarbylaluminoxane (e. g. , methylaluminoxane) in organic solvent in which the amount aluminoxane far exceeds the amount of hydrocarbylaluminum. The process fulfills the need for practical, commercially-feasible process technology capable of producing concentrated aluminoxane solutions with no significant yield losses, and by process technology that can be applied both to batch and to continuous modes of operation.