# US 4,393,203 A · Process of preparing alkylpolysaccharides

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,393,203 A
- Document ID: US4393203A
- Status: Granted
- Kind: A
- Application number: 06/371,693
- Filed: 1982-04-26
- Granted: 1983-07-12
- Earliest claimed: 1982-04-26
- Assignees: The Procter & Gamble Company
- Inventors: Mark H. K. Mao; Larry E. Miller; John M. Weeman
- Web page: https://patentgrep.com/patent/US4393203A

## CPC

- C07H 15/04: attached to an oxygen atom of the saccharide radical
- C08B 37/00: Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof (cellulose D21; {microbiological processes C12P})
- C11D 1/662: {Carbohydrates or derivatives}
- Y10S 159/10: Organic
- C07H: SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS (derivatives of aldonic or saccharic acids C07C, C07D; aldonic acids, saccharic acids C07C59/105, C07C59/285; cyanohydrins C07C255/16; glycals C07D; compounds of unknown constitution C07G; polysaccharides, derivatives thereof C08B; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification C12N15/00; sugar industry C13)
- C08B: POLYSACCHARIDES; DERIVATIVES THEREOF (polysaccharides containing less than six saccharide radicals attached to each other by glycosidic linkages C07H; fermentation or enzyme-using processes C12P19/00; sugar industry C13; production of cellulose D21)
- C11D: DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

Long chain fatty alcohols can be removed from alkylpolysaccharide products in thin film evaporators to achieve fatty alcohol levels of less than about 2% without excessive discoloration of the alkylpolysaccharide.

## Claims

### Claim 1

In the process of removing fatty alcohol containing from about 12 to about 18 carbon atoms from a mixture of said alcohol with an alkyl polysaccharide wherein saccharide chain length is greater than one on the average and less than about 20 the improvement of heating the mixture under vacuum in a thin film evaporator wherein the thin film evaporator provides, in operation, a Reynolds number of at least about 20,000 and a film thickness of less than about 10 mm and the temperature is from about 120.degree. C. to about 200.degree. C. and the vacuum is from about 0.1 to about 20 mm of mercury so that no more than about 2% of said fatty alcohol remains.

### Claim 2 (depends on 1)

The process of claim 1 wherein the alkyl polysaccharide comprises an alkyl group of from about 12 to about 18 carbon atoms; the polysaccharide chain is derived from a reducing saccharide containing five or six carbon atoms and there are from about 11/2 to about 4 saccharide moieties on the average.

### Claim 3 (depends on 2)

The process of claim 2 wherein the reducing saccharide is glucose.

### Claim 4 (depends on 1)

The process of claim 1 wherein the Reynolds number is at least about 50,000, the temperature is from about 140.degree. C. to about 180.degree. C., and the vacuum is from about 0.1 to about 5 mm of mercury.

### Claim 5 (depends on 2, 3, 4)

The process of claim 2, 3, 4, or 1 wherein the fatty alcohol is removed to a level of less than about 1/2%.