New Cooling Mixtures Containing Sodium Acetate Trihydrate

New Cooling Mixtures Containing Sodium Acetate Trihydrate Russian Journal of Applied Chemistry, Vol. 77, No. 3, 2004, p. 507. Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 3, 2004, p. 513. Original Russian Text Copyright 2004 by Osadchenko, Tomilov. BRIEF COMMUNICATIONS I. M. Osadchenko and A. P. Tomilov State Research Institute of Organic Chemistry and Technology, Moscow, Russia Received December 30, 2003 Abstract Binary cooling mixtures consisting of CH COONa 3H O and NH NO , Al(NO ) 9H O, or 3 2 4 3 3 3 2 Ni(NO ) 6H O were developed. They allow the initial temperature to be decreased by 18 19 C. Application 3 2 2 of the mixtures does not require additional consumption of water. Recently there has been an interest in problems of and 3.0 C after stirring for 4.0 5.0 min. The tempera- small-scale power engineering for the purpose of ture difference was 19.5 C. The mixture after stirring power saving. One of the routes to power saving is becomes a suspension. The results of similar tests the development of materials and devices based on the with mixtures of other compositions are presented in use of physicochemical properties of substances, e.g., the table. The table shows that, at the component of cooling mixtures. Cooling mixtures as autonomous weight ratios from 1 : 0.5 to 1 : 2.9, the temperature sources of cold are used in laboratory and everyday decrease is from 17.5 to 29.5 C, i.e., the mixtures practice and for cooling and transportation of biologi- show considerably higher performance than Shal’tis. cal materials (e.g., vaccines, blood, etc.) [1 3]. Moreover, the mixture proposed is simpler in use. Numerous compositions of cooling mixtures con- Performance of binary cooling mixtures taining solid salts and water (ice) have been described. A temperature decrease on mixing them is due to Second CH COONa, M(NO ) , CH COONa : T, 3 3 n 3 the absorption of heat upon salt dissolution [1]. component g g M(NO ) C 3 n For example, a ternary mixture containing (wt %) NH NO 40.62, Na CO 40.62, and CuSO 0.76 is 4 3 2 3 4 NH NO 6 6 1: 1 20.5 4 3 produced for everyday use under the Shal’tis brand 7 4 1 : 0.6 20.0 name [2]. The temperature decrease on dissolving this 8 4 1 : 0.5 17.5 mixture in water is 10 C (difference in the tempera- Ni(NO ) 7 7 1: 1 25.5 tures before and after mixing). The drawback of this 3 2 6H O 7 14 1: 2 26.5 mixture is relatively low performance. A search for new mixtures is an urgent problem. Al(NO ) 7 20 1 : 2.9 22.5 3 3 9H O 7 7 1: 1 29.0 Mixtures containing CH COONH 3H O were 2 3 4 2 7 14 1: 2 29.5 tested previously. The test procedure is described in [4]. The tests performed showed that mixtures contain- REFERENCES ing CH COONa 3H O and NH NO , Al(NO ) 3 2 4 3 3 3 9H O, or Ni(NO ) 6H O are the most effective. It is 1. Kratkii slovar’ khimika (Concise Chemist’s Dictionary), 2 3 2 2 important that the binary mixtures found are applied Perel’man, V.I., Compiler, Moscow: Khimiya, 1964. without using free water. Evidently, the process 2. Goryainova, T.S., Isaev, P.V., Manakova, G.V., et al., occurs with participation of water of crystallization. Tovary bytovoi khimii (Goods of Household Chemis- We found no data on such mixtures in the literature. try), Moscow: Ekonomika, 1975. Let us give a typical example of application of 3. Spravochnik po veterinarno-zootekhnicheskomu i the cooling mixture. A 100-ml beaker was charged laboratornomu oborudovaniyu (Reference Book on with 5.0 g of CH COONa 3H O and then 7.0 g of Veterinary-Zootechnic and Laboratory Equipment), 3 2 Makeev, A.S., Ed., Moscow: Kolos, 1966. NH NO (as powders), and the temperature was re- 4 3 corded with a thermometer placed inside the beaker. 4. Semishin, V.I., Praktikum po obshchei khimii (Practical The initial temperature was 21.5 C. The minimal Course of General Chemistry), Moscow: Khimya, temperature was 2.0 C after stirring for 2.0 2.5 min 1967. 1070-4272/04/7703-0507 2004 MAIK Nauka/Interperiodica Russian Journal of Applied Chemistry Springer Journals

New Cooling Mixtures Containing Sodium Acetate Trihydrate

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Kluwer Academic Publishers-Plenum Publishers
Copyright © 2004 by MAIK “Nauka/Interperiodica”
Chemistry; Chemistry/Food Science, general
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