Patent
Production of aminoethanesulfonic acid
TLDR
In this paper, the objective compound is separated from the reaction liquid of chloroethylamine hydrochloride with sodium sulfite, by cooling the produced reaction liquid at a specific temperature, thereby crystallizing the objective compounds.Abstract:
PURPOSE:To separate the objective compound effectively from the reaction liquid of chloroethylamine hydrochloride with sodium sulfite, by cooling the produced reaction liquid at a specific temperature, thereby crystallizing the objective compound CONSTITUTION:Aminoethanesulfonic acid useful as a raw material of pharmaceuticals or dyes is produced by the reaction of chloroethylamine hydrochloride with sodium sulfite In the above process, the produced reaction liquid containing the objective compound and by-produced sodium chloride and sodium sulfate produced by the oxidation of said compound or existing in the sodium sulfite used as a raw material, is cooled at 13-35 degC, preferably 15-20 degC to effect the selective crystallization of the objective compound The objective compound having high purity can be produced economically on an industrial scale, effectively suppressing the contamination with said inorganic saltsread more
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High-tensile steel wire excellent in ductility
TL;DR: In this article, the authors proposed to manufacture high-tensile steel wire excellent in ductility by providing a specific composition and strength, providing, as well, the surface of a steel wire after wire drawing with residual compressive stress positively and by regulating the residual compressed stress to a specific range according to the strength of the steel wire.