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US7404911: Heat-transfer media having improved thermal stability and based on higher polyglycols

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Filing Information

Inventor(s) Markus Hafner · Achim Stankowiak · Johann Schuster · Stefan Mauerberger ·
Assignee(s) Clariant International Ltd. ·
Attorney/Agent(s) Richard P. Silverman ·
Primary Examiner Anthony J. Green ·
Application Number US11701773
Filing date 02/02/2007
Issue date 07/29/2008
Prior Publication Data
Predicted expiration date 02/02/2027
U.S. Classifications 252/73  · 252/71  · 622/351  · 126/910  · 165/104.19  · 165/104.28  · 165/104.31  · 252/70  · 621/18  · 252/74  · 252/75  · 252/76  · 252/77  · 252/781  · 252/79  · 106/13  ·
International Classifications C09K318  · C09K500  · C09K508  · C09K510  ·
Kind CodeB2
Foreign Priority DE102006004895 - 02/03/2006 ·
8 Claims, No Drawings


Abstract

The present invention relates to heat-transfer concentrates for solar installations, containing a) from 92 to 99% by weight of at least one polyglycol of the formula R—O—(CH2—CH2—O)n—H, in which n is an integer of from 3 to 500 and R is H, a C1- to C4-alkyl group or an aromatic radical having 6 to 12 carbon atoms, b) from 1 to 8% by weight of at least one corrosion inhibitor, with the proviso that its content of ethylene glycol and 1,2-propylene glycol is less than 0.2% by weight.

Independent Claims | See all claims (8)

  1. 1. A heat-transfer concentrate containing a) from 92 to 99% by weight of a mixture of triethylene glycol and tetraethylene glycol in a mixing ratio of from 3:1 to 1:3, b) from 1 to 8% by weight of at least one corrosion inhibitor, with the proviso that said concentrate has less than 0.2% by weight of ethylene glycol and 1,2-propolene glycol.
  2. 8. A method for transporting heat or cold in a thermal solar installation, said method comprising circulating a heat-transfer medium in said thermal solar installation, wherein the heat-transfer medium contains a heat-transfer concentrate and water, said heat-transfer medium consisting of a) from 45 to 55% by weight of a mixture of triethylene glycol and tetraethylene glycol in a mixing ratio of from 3:1 to 1:3, b) from 1 to 4% by weight of at least one corrosion inhibitor and c) from 45 to 55% by weight of water, wherein said heat-transfer concentrate has less than 0.2% by weight of ethylene glycol and 1,2-propylene glycol.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US4210549* BASF Wyandotte Corporation Hirozawa et al. Jul 1980
US4455248* Shell Oil Company Wood Jun 1984
US4758367* Union Carbide Corporation George Jul 1988
US5595678 CPI Engineering Services, Inc. Short Jan 1997
US5741436* Prestone Products Corp. Gershun et al. Apr 1998
US6093341 Clariant GmbH Minks Jul 2000
US20060033076* Clariant GmbH Hafner et al. Feb 2006

Foreign Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
AT206414ONIONS JOHN HENRYNov 1959
DE219033Feb 1985
DE19525090BASF AGJan 1997
EP0025011Scheller AGMar 1981
JP4279690*Oct 1990
RU2125074*OBSHCHESTVO S OGRANICHENNOJ OTJan 1999
* cited by examiner

Other Publications

English Language Abstract of DE 195 25 090, Jan. 16, 1997.
Korrosionsuntersuchungen in Waermetraegern fuer Solaranlagen, Arbeitsgemeinschaft Korrosion E.V., (1988) p. 297-304, vol. 39, Germany.
Hillerns, F., et al., Korrosionsschutz und Thermische Belastbarkeit, Solarwaerme, (May 1999) pp. 25-27, Germany.
German Patent Office Action for corresponding Application DE102006004895.4, issued Dec. 22, 2006.
English Language Abstract for DD 219033 A3, Feb. 20, 1985.
English Language Abstract for AT 206414 B, Nov. 25, 1959.
EP Office Action for corres. Application No. EP 07001110.1, Mar. 19, 2007.
English Language Machine Translation of EP 0025011, published on Mar. 11, 1981 (Abstract, Description and Claims).
English Language Machine Translation of DE 19525090, published Jan. 16, 1997 (Decsription and Claims).

Referenced By

The current document is not referenced by other documents.