WO1998059013A1 - Composition non corrosive de liquide de refroidissement - Google Patents

Composition non corrosive de liquide de refroidissement Download PDF

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Publication number
WO1998059013A1
WO1998059013A1 PCT/EP1998/002800 EP9802800W WO9859013A1 WO 1998059013 A1 WO1998059013 A1 WO 1998059013A1 EP 9802800 W EP9802800 W EP 9802800W WO 9859013 A1 WO9859013 A1 WO 9859013A1
Authority
WO
WIPO (PCT)
Prior art keywords
weight
composition
alkali metal
water
amount
Prior art date
Application number
PCT/EP1998/002800
Other languages
English (en)
Inventor
Vijay Mukund Naik
Vijay Ramakrishnan
Original Assignee
Unilever N.V.
Unilever Plc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GBGB9712972.0A external-priority patent/GB9712972D0/en
Priority claimed from GBGB9803429.1A external-priority patent/GB9803429D0/en
Application filed by Unilever N.V., Unilever Plc filed Critical Unilever N.V.
Priority to AU77648/98A priority Critical patent/AU7764898A/en
Priority to BR9810190-0A priority patent/BR9810190A/pt
Publication of WO1998059013A1 publication Critical patent/WO1998059013A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/08—Materials not undergoing a change of physical state when used
    • C09K5/10—Liquid materials

Definitions

  • the invention relates to non-toxic, non-corrosive, coolant compositions which can for example be used in the storage of frozen materials.
  • the invention more particularly refers to an aqueous solution of a mixture of inorganic and organic anions along with alkali metal cations for use in coolant "batteries" for example to maintain a storage temperature of -18°C and below for the storage of materials like perishable foods, frozen desserts and ice-creams.
  • the coolant solution in the jacket may be frozen to required temperatures by operating a small refrigeration unit permanently attached to the containers/cabinets/packaging boxes as and when required.
  • the movable containers/boxes etc. can be taken periodically to a service station for freezing the coolant solution in the jacket by coupling them temporarily to a central chilling/refrigeration unit.
  • frozen desserts In the particular case of frozen desserts, ice-creams etc., it is desirable that these items are stored and distributed at relatively low temperatures e.g. below -10°C or more referred at a temperature below -18°C before they are sold to the end consumer.
  • relatively low temperatures e.g. below -10°C or more referred at a temperature below -18°C before they are sold to the end consumer.
  • coolant systems which freeze below -18°C are used by manufacturers and distributors of frozen dessert/ice-cream, for this purpose.
  • aqueous coolant systems Some of the commonly known ingredients in aqueous coolant systems are sodium chloride, ammonium chloride etc. (which are corrosive) and sodium nitrate, sodium nitrite, ammonium nitrate, ammonium nitrite etc. (which are toxic) . Even some of the corrosion inhibiting agents employed along with these coolant systems (e.g., alkali metal chromates/dichromates) pose a possible health risk if foods contaminated with the accidentally leaked coolants are consumed by human beings. In view of the above problems it is a common practice to employ aqueous solutions of only foods-compatible ingredients (such as propylene glycol (PG) ) as coolants.
  • PG propylene glycol
  • JP 07026252 discloses addition of inorganic salts such as nitrates, sulphates, carbonates, acetates, hydroxides and halides as freezing point depressants to a mixture of propylene glycol and water.
  • the freezing temperature range is below -18°C.
  • GB 2187471 discloses a cooling system comprising of calcium or potassium hydrogen carbonate along with polyhydric alcohol such as propylene glycol or glycerol, a saccharide and a corrosion inhibiting agent such as alkali metal salts of silicic acid. This mixture is corrosion resistant only against aluminum and aluminum alloys. The effective temperature range is only -8.5 to -10.0°C.
  • the present invention is an improvement in that it provides novel synergistic coolant composition which are foods compatible, non-corrosive, and with a high heat absorption capacity in the desired temperature range of -27°C to -18°C.
  • the present invention provides a coolant composition which is foods compatible, with very low corrosivity towards commonly employed low cost materials used in the construction of storage cabinets and with a heat absorption capacity in the temperature range of -27°C to -18°C which is higher than 60 J/g.
  • an aqueous coolant composition comprising i) an alkali metal acetate salt being present in an amount that will provide from 5.4 to 31% by weight acetate by weight of water in the composition; and ii) one or more salts of an alkali metal in which the anionic moiety is selected from carbonate or bicarbonate and phosphate or mixtures thereof, said alkali metal present in an amount that will provide 0.07 to 9.5% by weight anionic moiety by weight of water in the composition, the composition having a pH of between 9 to 12.5.
  • an aqueous coolant composition comprising i) an alkali metal acetate salt being present in an amount that will provide from 5.4 to 31%, by weight acetate by weight of water in the composition; and ii) a carbonate or bicarbonate salt of an alkali metal, said alkali metal present in an amount that will provide 0.3 to 9.5%, by weight carbonate or bicarbonate by weight of water in the composition, the composition having a pH of between 9 to 12.5.
  • an aqueous coolant composition comprising i) an alkali metal acetate salt being present in an amount that will provide from 5.4 to 31%, by weight acetate by weight of water in the composition; and ii) a phosphate salt of an alkali metal, said alkali metal present in an amount that will provide 0.07 to 4% by weight phosphate by weight of water in the composition, the composition having a pH of between 9 to 12.5.
  • the amount of alkali metal acetate will provide 14 to 25% by weight acetate by weight of water in the composition.
  • the carbonate or bicarbonate salt of alkali metal is present in an amount that will provide 1.5 to 3.5% by weight carbonate or bicarbonate by weight of water in the composition.
  • the composition comprises one or more of sulphate and silicate compounds as additives.
  • the level of sulphate compound when present is between 0.3 to 10% by weight of water in the composition and the silicate compound at a level of between 0.1 to 0.3% by weight of water in the composition.
  • the preferred alkali metal cation is sodium.
  • the composition comprises one or more of benzoate or propionate compounds as additives.
  • the level of benzoate or propionate compound when present is between 2 to 20% by weight of water in the composition.
  • the most preferred additive is sodium benzoate.
  • the preferred alkali metal cation is sodium.
  • the process for preparing the aqueous coolant composition according to the invention comprises mixing the various ingredients in any sequence.
  • the mixing is preferably effected under stirring to ensure a homogeneous solution.
  • the coolant composition may be used in pushcarts, vans, cabinets wherein the coolant is provided around the product storage area in a manner such that the same acts either as a heat barrier between the storage area and the external insulation/the atmosphere outside or acts as a heat sink. It can also be packaged in detachable/removable units of varying form, shape, size and capacity and constructed of suitable polymeric or other materials such as high, medium, or low density polyethylene, linear low density polyethylene, polyvinyl chloride, poly carbonate, polyester, metallic foil etc. The size, shape and form of the unit may be chosen to suit specific applications. A plurality of such units can be used as 'coolant batteries' in the storage area along with the product.
  • the different coolant compositions were prepared by dissolving the ingredients in lOOOg deionised water and the levels are indicated in table 1.
  • the coolant compositions as per the invention were compared to 35% propylene glycol (Control) which is currently used commercially as a coolant system.
  • the tests were conducted to determine the corrosivity, heat absorption capacity between -27°C to -18°C and pH of these coolant compositions.
  • the solutions were taken in 100 ml beakers and plates of plain carbon steel (CS) having dimensions of 2 cm x 6 cm x 2 mm were placed in these beakers.
  • CS plain carbon steel
  • the corrosive tendencies of the solutions were monitored in terms of iron solubilised in the solution (as analysed using an Inductively Coupled Plasma Emission Spectroscope ICPES: Perkin Elmer, Plasma 400) as well as visual appearance of the plates and the solutions.
  • the amount of heat to be provided to the material for raising its temperature from -27°C to -18°C is defined as its heat absorption capacity.
  • Samples of solution were weighed in hermetically sealed pans of a Differential scanning calorimeter (DSC) , Perkin Elmer Model No. DSC7, frozen to a temperature of -39°C and then heated at l°C/min to record heat absorbed between - 27°C and -18°C, as well as the temperature of initiation of melting.
  • DSC Differential scanning calorimeter
  • Determination of pH The pH of the freshly prepared solutions were measured using a pH meter.
  • Table 1 show that it was possible to develop a foods-compatible as well as corrosion resistant aqueous coolant composition with a high enough heat absorption capacity for use in a coolant battery to preserve frozen desserts/ice-creams at relatively low temperatures e.g. below -18°C, during storage and transportation.
  • the data also shows that the combination of various anions as per the invention is superior to any one of them individually with respect to corrosion resistance or heat absorption capacity.
  • the composition as per the invention is also superior to 35% propylene glycol (control) which is presently the commercially used coolant system.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Abstract

Cette composition aqueuse de liquide de refroidissement comprend: i) un acétate de métal alcalin présent en quantité suffisante pour obtenir 5,4 à 31 % en poids d'acétate par poids d'eau dans la composition, et ii) un ou plusieurs sels d'un métal alcalin dans lequel la fraction anionique est choisie dans le groupe constitué par carbonate ou bicarbonate et phosphate, ou par des mélanges de ceux-ci, le métal alcalin étant présent en quantité suffisante pour obtenir 0,07 à 9,5 % en poids de fraction anionique par poids d'eau, dans la composition, laquelle possède un pH compris entre 9 et 12,5.
PCT/EP1998/002800 1997-06-19 1998-05-06 Composition non corrosive de liquide de refroidissement WO1998059013A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU77648/98A AU7764898A (en) 1997-06-19 1998-05-06 Non-corrosive coolant composition
BR9810190-0A BR9810190A (pt) 1997-06-19 1998-05-06 Composição aquosa refrigerante

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9712972.0 1997-06-19
GBGB9712972.0A GB9712972D0 (en) 1997-06-19 1997-06-19 Non-corrosive coolant composition
GBGB9803429.1A GB9803429D0 (en) 1998-02-18 1998-02-18 Coolant composition
GB9803429.1 1998-02-18

Publications (1)

Publication Number Publication Date
WO1998059013A1 true WO1998059013A1 (fr) 1998-12-30

Family

ID=26311763

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1998/002800 WO1998059013A1 (fr) 1997-06-19 1998-05-06 Composition non corrosive de liquide de refroidissement

Country Status (4)

Country Link
AU (1) AU7764898A (fr)
BR (1) BR9810190A (fr)
ID (1) ID24232A (fr)
WO (1) WO1998059013A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6689289B1 (en) * 1999-07-16 2004-02-10 Texaco Inc. Synergistic combinations of carboxylates for use as freezing point depressants and corrosion inhibitors in heat transfer fluids
US7638069B2 (en) 2005-12-29 2009-12-29 Texaco Inc. Potassium propionates for use as freezing point depressants and corrosion protection in heat transfer fluids

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57151674A (en) * 1981-03-17 1982-09-18 Matsushita Electric Ind Co Ltd Heat-accumulating material
JPS6092383A (ja) * 1983-10-26 1985-05-23 Matsushita Electric Ind Co Ltd 蓄熱材
GB2187471A (en) * 1986-03-06 1987-09-09 Nippon Light Metal Co Coolant
US5065598A (en) * 1989-09-05 1991-11-19 Mitsubishi Denki Kabushiki Kaisha Ice thermal storage apparatus
EP0494506A1 (fr) * 1991-01-05 1992-07-15 BP Chemicals Limited Compositions de déglaçage
JPH0726252A (ja) * 1993-07-12 1995-01-27 Mitsubishi Heavy Ind Ltd 蓄冷材

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57151674A (en) * 1981-03-17 1982-09-18 Matsushita Electric Ind Co Ltd Heat-accumulating material
JPS6092383A (ja) * 1983-10-26 1985-05-23 Matsushita Electric Ind Co Ltd 蓄熱材
GB2187471A (en) * 1986-03-06 1987-09-09 Nippon Light Metal Co Coolant
US5065598A (en) * 1989-09-05 1991-11-19 Mitsubishi Denki Kabushiki Kaisha Ice thermal storage apparatus
EP0494506A1 (fr) * 1991-01-05 1992-07-15 BP Chemicals Limited Compositions de déglaçage
JPH0726252A (ja) * 1993-07-12 1995-01-27 Mitsubishi Heavy Ind Ltd 蓄冷材

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 8243, Derwent World Patents Index; Class G04, AN 82-91553E, XP002075920 *
DATABASE WPI Section Ch Week 8527, Derwent World Patents Index; Class E12, AN 85-162232, XP002075919 *
DATABASE WPI Section Ch Week 9514, Derwent World Patents Index; Class E17, AN 95-102159, XP002075921 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6689289B1 (en) * 1999-07-16 2004-02-10 Texaco Inc. Synergistic combinations of carboxylates for use as freezing point depressants and corrosion inhibitors in heat transfer fluids
CZ298867B6 (cs) * 1999-07-16 2008-02-27 Texaco Development Corporation Použití prostredku obsahujícího smes karboxylátu jako chladicího prostredku u automobilových motoru
US7638069B2 (en) 2005-12-29 2009-12-29 Texaco Inc. Potassium propionates for use as freezing point depressants and corrosion protection in heat transfer fluids

Also Published As

Publication number Publication date
AU7764898A (en) 1999-01-04
ID24232A (id) 2000-07-13
BR9810190A (pt) 2000-08-08

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