Dustin S Thomas, Age 43Lafayette, LA

6508954, Jan 21, 2003

Jan 18, 2000

09/484687

Hassan Y. Elnagar - Baton Rouge LA
Jonathan N. Howarth - Baton Rouge LA
Bruce C. Peters - Baton Rouge LA
Dustin H. Thomas - Baton Rouge LA

Albemarle Corporation - Richmond VA

C02F 512

252180, 2521872, 26421111, 510191, 514389, 514398, 514951, 5483171

Among the enhanced properties of the 1,3-dibromo-5,5-dimethylhydantoins described are their larger average particle sizes, their compactibility even though devoid of a binder, their excellent free-flowing and low-dust properties, and their more appealing aesthetic qualities, as compared to previously known 1,3-dibromo-5,5-dimethylhydantoins. These novel 1,3-dibromo-5,5-dimethylhydantoins can be produced, for example, by concurrently feeding (i) an aqueous solution or slurry formed from an inorganic base and 5,5-dimethylhydantoin, and (ii) a brominating agent, in proportions such that each nitrogen atom is substituted by a bromine atom, thereby forming product which precipitates in an aqueous reaction mixture. The pH of the reaction mixture is maintained in the range of about 5. 5 to about 8. 5.

6809205, Oct 26, 2004

Jan 18, 2000

09/484844

Hassan Y. Elnagar - Baton Rouge LA
Bruce C. Peters - Baton Rouge LA
Dustin H. Thomas - Baton Rouge LA

Albemarle Corporation - Richmond VA

C07D23374

5483205

The process enables highly effective N-halogenation of a compound having one or more halogenatable amido or imido functional groups in the molecule. The process involves, for example, concurrently feeding into a reactor (i) water, inorganic base, and the compound to be N-halogenated, e. g. , a hydantoin, and a feed of (ii) a brominating agent and/or a chlorinating agent. The proportions of these feeds are such that the pH is kept within the range of ca. 5. 5-8. 5 (preferably 6. 5-8. 5, and most preferably 6. 8-7. 2) and one or more of the amido or imido nitrogen atoms is substituted by a bromine or chlorine atom. A feature of the process is that it can be conducted at elevated temperatures as high as about 90Â C. without appreciable thermal decomposition of reactants or product. The resultant product continuously precipitates in high yield and purity.

7999118, Aug 16, 2011

Oct 17, 2005

11/251640

Hassan Y. Elnagar - Baton Rouge LA, US
Bruce C. Peters - Baton Rouge LA, US
Dustin H. Thomas - Baton Rouge LA, US

Albemarle Corporation - Richmond VA

C07D 233/74
C07D 233/82

5483205

This invention provides a process for the N-halogenation of at least one 5-hydrocarbyl hydantoin and/or at least one 5,5-dihydrocarbyl hydantoin. The process comprises concurrently feeding into a reaction zone (i) water, inorganic base, and 5,5-dimethylhydantoin, these being fed separately and/or in any combination(s), (ii) a separate feed of a brominating agent, and (iii) a separate feed of a chlorinating agent, in proportions such that during all or substantially all of the time the concurrent feeding is occurring halogenation of the 5-hydrocarbyl hydantoin and/or 5,5-dihydrocarbyl hydantoin occurs and resultant halogenated product precipitates in the liquid phase of an aqueous reaction mixture, and in which the pH of the liquid phase is continuously or substantially continuously maintained in the range of about 2. 0 to about 8. 0 during all or substantially all of the time the concurrent feeding is occurring.

2005004, Mar 3, 2005

Aug 16, 2004

10/919097

Hassan Elnagar - Baton Rouge LA, US
Bruce Peters - Baton Rouge LA, US
Edgar Spielman - Baton Rouge LA, US
Dustin Thomas - Baton Rouge LA, US

C07D209/48
C07D207/40
C07C291/00

548474000, 564114000, 548545000

The process enables highly effective N-halogenation of a compound having one or more halogenatable amido or imido functional groups in the molecule. The process involves, for example, concurrently feeding into a reactor (i) water, inorganic base, and the compound to be N-halogenated, e.g., a hydantoin, and a feed of (ii) a brominating agent and/or a chlorinating agent. The proportions of these feeds are such that the pH is kept at 5 or below or within a specified range e.g., 5.5-8.5 and one or more of the amido or imido nitrogen atoms is substituted by a bromine or chlorine atom. A feature of the process is that it can be conducted at elevated temperatures as high as about 90 C. without appreciable thermal decomposition of reactants or product. The resultant product continuously precipitates in high yield and purity. Moreover, products can be produced that are very pale yellow to almost pure white in appearance. Further, the process has been found capable of producing 1,3-dibromo-5,5-dimethylhydantoin with far larger particle sizes than previously produced on a commercial basis.

6166255, Dec 26, 2000

Sep 11, 1998

9/150820

Rebecca S. Cochran - Baton Rouge LA
Andrea P. Wight - Baton Rouge LA
Douglas H. Krzystowczyk - Orangeburg SC
Dustin H. Thomas - Baton Rouge LA

Albemarle Corporation - Richmond VA

C07C29104
C07C20968

564297

Exothermic oxidation of tertiary amine with aqueous hydrogen peroxide in an aqueous reaction medium formed or being formed from tertiary amine, aqueous hydrogen peroxide, carbon dioxide, and optionally chelating agent and/or additional water, is initiated at about 15 to about 25. degree. C. , and while agitating the reaction mixture, the temperature is allowed to rise adiabatically to a temperature in the range of about 50 to about 100. degree. C. In this way, it is possible to produce tertiary amine oxides with very low levels, if any, of nitrosamine impurity, without addition of metal and/or phosphorus-containing components recommended in the prior art. Even though a substantial portion of the reaction is performed at temperatures in the range of about 50-100. degree. C. , nitrosamine content, if any, in the resultant tertiary amine oxide product can be well below 30 ppb, and the free amine content, if any, can be well below 0. 3 wt %. Use of such relatively exothermically achieved high temperatures in turn results in faster reaction rates and enables use of shorter reaction periods.

6281176, Aug 28, 2001

Dec 3, 1999

9/454983

Rebecca S. Cochran - Baton Rouge LA
Patrick C. Hu - Baton Rouge LA
Michael S. McCaig - Baton Rouge LA
Edmund F. Perkins - Baton Rouge LA
Joe D. Sauer - Baton Rouge LA
Dustin H. Thomas - Baton Rouge LA

Albemarle Corporation - Richmond VA

A61K 7075
C07C22910

510123

This invention provides a process for producing a betaine/amine oxide mixture. This process comprises reacting, in a liquid medium, an alkali metal. omega. -halocarboxylate with a first tertiary amine of the formula R. sup. a. sub. 2 R. sup. b N, wherein each R. sup. a group is a hydrocarbyl group which independently has from 1 to about 4 carbon atoms, and wherein the R. sup. b group is a hydrocarbyl group which has from about 8 to about 24 carbon atoms, to produce a betaine product solution. To the betaine product solution is added a second tertiary amine of the formula R. sup. a. sub. 2 R. sup. b N, wherein each R. sup. a group is a hydrocarbyl group which independently has from 1 to about 4 carbon atoms, and wherein the R. sup. b group is a hydrocarbyl group which has from about 8 to about 24 carbon atoms, to produce an amine/betaine mixture. The first and second tertiary amines can be separate portions of the same amine.

4593129, Jun 3, 1986

Apr 18, 1984

6/601505

R. Woodrow Wilson - Baton Rouge LA
Dustin H. Thomas - Baton Rouge LA

Ethyl Corporation - Richmond VA

C07C 256

568716

A process for making an alkali metal alkoxide (e. g. sodium alkoxide) of a halogen-substituted alcohol (e. g. fluorine-substituted alcohols) by dispersing an alkali metal (e. g. sodium) in a cycloalkane (e. g. cyclohexane) containing a phenol (e. g. o-allylphenol) and adding the resultant dispersion to an ether (e. g. THF) solution of a halogen-substituted alcohol. The resultant alkali metal haloalkoxide solution contains phenoxides and can be reacted with a phosphonitrilic chloride polymer to introduce haloalkoxide and phenoxide substituents.

5593619, Jan 14, 1997

Mar 16, 1995

8/406225

Scott A. Bottelberghe - Waldo AR
Dustin H. Thomas - Baton Rouge LA
Terry M. Shurtleff - Emerson AR
Roland G. Poertner - Magnolia AR

Albemarle Corporation - Richmond VA

C09K 2108
C09K 2114

252609

This invention relates to compositions containing improved granulated hexabromocyclododecane flame retardant products, flame retardant formulations containing products, and to a process for forming the improved granulated flame retardant products, wherein the granulated product is characterized as having a friability loss of less than about 8 percent.