Charles H Winslow

US Patent:

52830462, Feb 1, 1994

Filed:

Nov 14, 1990

Appl. No.:

7/613935

Inventors:

Charles E. Winslow - Norfolk VA
Joseph L. Bush - Chesapeake VA
Leonard C. Ellis - Suffolk VA

Assignee:

Hoechst Celanese Corporation - Somerville NJ

International Classification:

C01B 1766

US Classification:

423515

Abstract:

Aqueous co-product, produced by distillation of reaction filtrate from a batch reaction for manufacturing sodium dithionite by reacting sodium formate, sodium hydroxide, and sulfur dioxide in aqueous methanol solution, is rapidly evaporated to remove about 80% of its water content, so that only the determined quantity of water remains with its determined contents of alkali metal compounds, and is utilized as an admixed component of a succeeding batch.

US Patent:

39610349, Jun 1, 1976

Filed:

Sep 25, 1974

Appl. No.:

5/509160

Inventors:

Logan C. Bostian - Virginia Beach VA
Charles E. Winslow - Norfolk VA

Assignee:

Virginia Chemicals Inc. - Portsmouth VA

International Classification:

C01B 1764

US Classification:

423181

Abstract:

Filtrate from a formate-sodium hydrosulfite preparation contains valuable amounts of sodium formate and sodium bisulfite, which are raw materials for the synthesis of sodium hydrosulfite. The filtrate also contains sodium thiosulfate which is a known catalyst for the decomposition of sodium hydrosulfite and, therefore, must not be introduced in with the raw materials. Accordingly the method concerns removing the sodium thiosulfate by means of ion exchange with a resin and directing the valuable sodium bisulfite and sodium formate effluent including methanol and water to a distillation column.

US Patent:

46222162, Nov 11, 1986

Filed:

Aug 6, 1985

Appl. No.:

6/762839

Inventors:

Charles E. Winslow - Norfolk VA
Joseph L. Bush - Chesapeake VA
Daniel D. Dickens - Chesapeake VA

Assignee:

Virginia Chemicals, Inc. - Portsmouth VA

International Classification:

C01B 1766

US Classification:

423515

Abstract:

A method is taught for increasing the yield of anhydrous sodium dithionite by adding an organic compound that is thiosulfate reactive to a batch reactor containing a puddle solution of methanol and fed with formic acid or an alkali formate as a first feed, an aqueous alkali compound as a second feed, an aqueous alkali formate solution as a third feed, and a methanolic SO. sub. 2 solution as a fourth feed. This organic compound may be added prior to, combined with, or concurrently with one of the four feeds to the reactor. Preferably, it is added concurrently with the third feed and throughout the entire course of the reaction, ending with the beginning of the cooling period. A suitable addition rate is 0. 4-0. 6 wt. %/minute, preferably 0. 5 wt. %/minute. All of the organic compound is consumed, and at least a portion of the thiosulfate ion is destroyed.

US Patent:

43283667, May 4, 1982

Filed:

Feb 25, 1980

Appl. No.:

6/124650

Inventors:

Charles E. Winslow - Norfolk VA
Leonard C. Ellis - Chesapeake VA

Assignee:

Virginia Chemicals Inc. - Portsmouth VA

International Classification:

C07C 5148
C07C 5306
C07C 2986
C07C 3124

US Classification:

562513

Abstract:

This invention provides a process for recovery of sodium formate from an aqueous waste stream which is a byproduct mother liquor derived from a reaction system in which pentaerythritol is produced by the reaction of formaldehyde with acetaldehyde in the presence of sodium hydroxide catalyst. As one of its important features, the invention process involves contacting the mother liquor with a monoalkylamine solvent which is highly selective for extraction of organic materials to the exclusion of sodium formate.

US Patent:

49734717, Nov 27, 1990

Filed:

Jun 29, 1989

Appl. No.:

7/373163

Inventors:

Joseph L. Bush - Chesapeake VA
Charles E. Winslow - Norfolk VA

Assignee:

Hoechst Celanese Corporation - Somerville NJ

International Classification:

C01B 1766
B01D 1900
C09K 300

US Classification:

423515

Abstract:

There is disclosed a method for the production of dust-free sodium dithionite from the reaction of a alkaline formate sulfur dioxide and an alkaline metal agent in the presence of a thiosulfate reactive compound by introducing a water-soluble polymer having a molecular weight less than 60,000 and delaying the start of the alkaline metal agent until the sodium formate and the sulfur dioxide have begun to be introduced into the reactor.

US Patent:

42184290, Aug 19, 1980

Filed:

May 16, 1978

Appl. No.:

5/906583

Inventors:

Logan C. Bostian - Virginia Beach VA
Charles E. Winslow - Norfolk VA

Assignee:

Virginia Chemicals Inc. - Portsmouth VA

International Classification:

C01B 1766

US Classification:

423515

Abstract:

A batch process, in which a sodium bisulfite compound is the alkaline agent, is described for producing anhydrous sodium dithionite at high productivity by reduction of sulfur dioxide with the formate radical in concentrated aqueous methanolic solution. Minimum amounts of water, in which sodium formate is dissolved, and of methanol, in which sulfur dioxide is dissolved, are used. The process provides the optimum productivity of U. S. Pat. No. 3,887,695 while obviating the hazards and freeze-up difficulties that are inherent in forming and transferring a sodium hydroxide solution at 160. degree. C. and also minimizes the amount of methyl formate formed at equilibrium after a large number of methanol recyclings.

US Patent:

50342100, Jul 23, 1991

Filed:

May 18, 1990

Appl. No.:

7/525397

Inventors:

Charles E. Winslow - Norfolk VA
Joseph L. Bush - Chesapeake VA

Assignee:

Hoechst Celanese Corporation - Somerville NJ

International Classification:

C01B 1766
B01D 5334

US Classification:

423515

Abstract:

Vent gas from the condenser-scrubber system of a reactor, in which dithionites are made by reacting a formate, sulfur dioxide, and an alkali in aqueous methanol, is reduced in its ethylene oxide content to less than 10 ppm maintaining the ratio of sulfur dioxide to ethylene oxide entering the scrubber to greater than 1. 0, preferably greater than 2. 5, and most preferably greater than 3. 0 and at a temperature of -20. degree. C. to 0. degree. C.