Patent
Sodium chloride having novel crystal form and aqueous solution containing it
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TLDR
In this paper, a flat tetrahedron-shaped crystal form was obtained by treating cristobalite with hydrochloric acid with sugar and furthermore with an aq. soln. with a specified catalyst.Abstract:
PURPOSE:To obtain sodium chloride having flat tetrahedron-shaped crystal form by treating an aq. soln. of sodium chloride with a specified catalyst. CONSTITUTION:An aq. soln. obtd. by treating cristobalite with hydrochloric acid is added with sugar and furthermore with an aq. soln. of sodium dichromate added with a small amt. of iron chloride to obtain the catalyst for giving the flat tetrahedron-shaped crystal form. A concd. sodium chloride aq. soln. is added with 0.01-1wt.% the catalyst and evaporated to dry. The obtd. solid is added with distilled water to dissolve and again evaporated to dry. The dissolution- evaporation to dry operation is carried out several times, thereafter the catalyst is filtered off from the soln. and the filtrate is evaporated to dry. Thereby, a mixture of sodium chloride having the flat tetrahedron-shaped crystal form and sodium chloride convertible into the flat tetrahedron-shaped crystal form, is obtd. The former sodium chloride having the new crystal form improves the stability of a medicine for external skin application and the latter convertible sodium chloride accelerates activation as an aq. soln. together with iron chloride in the same way as the former.read more
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References
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Improvements in the Manufacture of Detachable Electrolytic Iron Deposits.
TL;DR: In this article, large thin iron plates are deposited at a temperature between 75-85˚ C and at high current-densities, and the cathodes may be coated with arsenic or antimony before use.
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Production of salt of 'tremie', so-called inverted pyramidal type crystal salt obtained by removing bottom from regular tetrahedron
Sumita Tetsuo,Shimomura Tomio +1 more
TL;DR: In this article, the authors proposed a method to efficiently produce salt of 'TREMIE' and to make quality of product uniform, by heating saturated brackish water having a solution composition comprising calcium chloride and magnesium chloride of specific conditions, having a specific amount of SO4 ion and evaporating it while making it flow in a specific temperature range.