# US 5,346,645 A · Desiccant composition and a method of desiccating articles

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- Number: US 5,346,645 A
- Document ID: US5346645A
- Status: Granted
- Kind: A
- Application number: 07/889,364
- Filed: 1992-05-28
- Granted: 1994-09-13
- Earliest claimed: 1991-05-28
- Assignees: Daikin Industries, Ltd.
- Inventors: Yukio Omure; Satoshi Ide; Takahiro Matsuda; Hirokaza Aoyama; Eiji Seki
- Web page: https://patentgrep.com/patent/US5346645A

## CPC

- C11D 7/261: {Alcohols; Phenols}
- B01D 12/00: Displacing liquid, e.g. from wet solids or from dispersions of liquids or from solids in liquids, by means of another liquid
- C11D 7/5018: {Halogenated solvents}
- C11D 7/28: containing halogen
- C11D: DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)

## Abstract

The invention provides a desiccant composition comprising an alcohol and a fluorinated aliphatic hydrocarbon compound of the general formula C.sub.n F.sub.m H.sub.2n+2-m wherein m and n each is a positive integer satisfying the relations: 4.ltoreq.n.ltoreq.6 and 2n-2.ltoreq.m<2n+2, and a method of desiccating an article with said desiccant composition.

## Claims

### Claim 1

A desiccating method for removing surface water from an article which comprises contacting the article with a desiccant composition comprising at least one fluorinated aliphatic 1,1,2,3,4,4-hexafluorobutane, 2-methyl-1,1,1,3,3,3-hexafluoropropane, 1,2,2,3,3,4-hexafluorobutane, 1,1,1,2,3,3,4-heptafluorobutane, 1,1,2,2,3,4,4-heptafluorobutane, 1,1,1,2,3,4,4-heptafluorobutane, 1,1,2,2,3,3,4-heptafluorobutane, 1,1,1,2,3,3,4,4-octafluorobutane, 1,1,1,2,2,3,3,4-octafluorobutane, 1,1,2,2,3,3,4,4-octafluorobutane, 1,1,1,2,2,3,3,4,4-nonafluororbutane, 1,1,1,2,2,3,4,4,4-nonafluorobutane, 1,1,2,3,3,4,5,5-octafluoropentane, 1,1,1,2,2,5,5,5-octafluoropentane, 1,1,1,2,2,3,3,4,4,5,5-undecafluoropentane, 1,1,1,2,2,3,3,4,5,5,5-undecafluoropentane, 1,1,2,2,3,3,4,4,5,5,6,6-dodecafluorohexane, 1,1,1,2,2,5,5,6,6,6-decafluorohexane, 2-trifluoromethyl-1,1,1,2,4,4-hexafluorobutane, 2-trifluoromethyl-1,1,1,2,3,3,4,4-octafluorobutane, 2-trifluoromethyl-1,1,1,3,4,5,5-heptafluoropentane, 2-trifluoromethyl-1,1,1,2,3,4,5-heptafluoropentane, 2-trifluoromethyl-1,1,1,3,4,5,5,5-octafluoropentane, 2-trifluoromethyl-1,1,1,2,3,4,5,5-octafluoropentane, 2-trifluoromethyl-1,1,1,2,3,5,5,5-octafluoropentane, 2-trifluoromethyl-1,1,1,2,3,4,5,5,5-nonafluoropentane, 1,1,1,2,2,3,3,4,4,5,5,6,6-tridecafluorohexane and 1,1,1,2,2,3,3,4,4,5,6,6,6-tridecaflurorohexane, and 3 to 25% by weight, based on the weight of the composition, of at least one alcohol selected from the group consisting of methanol, ethanol, i-propanol, n-propanol, i-butanon, sec-butanol, tert-butanol, 2,2,2-trifluoroethanol, 2,2,3,3-tetrafluoropropanol, and 2,2,3,3,3,-pentafluoropropanol.

### Claim 2 (depends on 1)

The desiccating method of claim 1 which comprises dipping said article in said desiccant

### Claim 3 (depends on 1)

The desiccating method of claim 1 which comprises spraying said article with said desiccant composition at a temperature of about 40.degree. C. to the boiling temperature of the composition.

### Claim 4 (depends on 1)

The desiccating method of claim 1 which comprises contacting said article with the vapor of said desiccant composition.

### Claim 5 (depends on 1)

The desiccating method of claim 1 which comprises dipping said article in said desiccant composition maintained at a temperature between 40.degree. C. and the boiling temperature of the composition and, then, contacting the same article with the vapor of said desiccant composition.

### Claim 6 (depends on 1)

The desiccating method of claim 1 which comprises spraying said article with said desiccant composition at a temperature of about 40.degree. C. to the boiling temperature of the composition and, then, contacting the same article with the vapor of said desiccant composition.

### Claim 7 (depends on 1)

The desiccating method of claim 1 wherein said alcohol is present in an amount of from 3 to 15% by weight of the composition.