Phase Relations and Decomposition for Systems of Diethylamine Hydrochloride-Adipic Acid and Diethylamine Hydrochloride-Sebacic Acid

Abstract

Abstract: Phase diagrams and decomposition for systems of (C₂H₅)₂NH·HCl C₆H₁₀ O₄ (adipic acid) and (C₂H₅)₂NH·HCl-C₁₀ H₁₈ O₄ (sebacic acid) have been investigated by DTA, DSCand visual polythermal methods. Both two systems are of the simple eutectic type. Eutectics are located in 50% of C₆H₁₀ O₄ at 94 ℃ and 55% of C₁₀ H₁₈ O₄ at 106 ℃ respectively. (C₂H₅)₂NH·HCl melts at 217 ℃ and decomposes as soon as it just melted. Apolymorphic reaction of (C₂H₅)₂NH·HCl occurs at 98 ℃, the transition heat is 29.7 J/g. Experiments also revealed that adipic acid melts at 152.8—155.7 ℃ with melting heat 199.1 J/g, decomposes at 250.8—263.0 ℃ with decomposition heat 174.2 J/g; sebacic acid melts at 133.1—135.9 ℃ with melting heat 199.8 J/g and decomposes at 233.2—269.2 ℃, but no exact value of decomposition heat has been determined.

Key words: Soldering, Diethylamine hydrochloride, Adipic acid, Sebacic acid, DTA, Phase diagram

CLC Number:

O612.3

TrendMD:

LIAO Fu-Hui, GAO Su, ZHANG Qi-Yun  . Phase Relations and Decomposition for Systems of Diethylamine Hydrochloride-Adipic Acid and Diethylamine Hydrochloride-Sebacic Acid[J]. Chem. J. Chinese Universities, 2000, 21(4): 626.

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Phase Relations and Decomposition for Systems of Diethylamine Hydrochloride-Adipic Acid and Diethylamine Hydrochloride-Sebacic Acid

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