Thomas R Nicholas

US Patent:

6399685, Jun 4, 2002

Filed:

Dec 11, 2000

Appl. No.:

09/734053

Inventors:

W. Dirk Klobucar - Baton Rouge LA
William B. Harrod - Minden LA
Billie B. Dadgar - Magnolia AR
Joseph D. McLean - Emerson AR
Gary D. Heidebrecht - Orangeburg SC
Hao V. Phan - Columbia SC
Thomas R. Nicholas - Orangeburg SC
Jeffrey L. Broeker - Orangeburg SC

Assignee:

Albemarle Corporation - Richmond VA

International Classification:

C08K 552

US Classification:

524145, 524127, 558162, 558 92

Abstract:

Emulsion formation is minimized or prevented and hydrolytic product degradation is suppressed during purification of impure bisphenol-A bis(diphenylphosphate). This is accomplished by forming a hydrocarbon solution of bisphenol-A bis(diphenylphosphate) plus impurities in a solvent comprising at least one aromatic hydrocarbon and at least one paraffinic hydrocarbon. Optionally, but preferably, this solution is washed with water or an aqueous buffer solution. Next, the hydrocarbon solution is washed one or more times with an aqueous alkaline washing solution that has a specific gravity that differs from the specific gravity of the hydrocarbon solution by at least about 0. 05 gram per cubic centimeter. After each washing the mixture settles into a purified organic phase and a separate aqueous phase, and these phases are separated from each other. After completing the one or more alkaline washings and separations, the resultant purified organic phase is washed one or more times with water to remove alkaline components from the hydrocarbon solution, and after each such washing the washed mixture is settled into a less alkaline purified organic phase and a separate aqueous phase.

US Patent:

20120108854, May 3, 2012

Filed:

Jul 6, 2010

Appl. No.:

13/382683

Inventors:

Mahmood Sabahi - Baton Rouge LA, US
Thomas Robert Nicholas - Orangeburg SC, US

Assignee:

Albemarle Corporation - Baton Rouge LA

International Classification:

C07C 39/12

US Classification:

568720, 568727

Abstract:

Processes for producing 1,3,5-trimethyl-2,4,6-tris(3,5-dialkyl-4-hydroxybenzyl)benzene are provided, in particular such processes that utilize 2,6-di-tert-butylphenol, paraformaldehyde, a secondary amine, mesitylene, and acetic acid.