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US 4,083,942 AGranted
Process for producing metal bromides
AssigneeGreat Lakes Chemical Corporation
InventorDavid C. Sanders
Life of this patent
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Abstract
Alkali and alkaline earth metal bromides may be prepared by reacting a basic compound of an alkali or alkaline earth metal with a reducing agent in the presence of water and thereafter adding thereto stepwise alternate incremental portions of bromine and the basic compound while maintaining the pH less than about 7.0.
Claims14
A stable process for preparing metal bromides without excessive foaming comprising the steps of:
- reacting a less than equivalent amount of a basic compound of a metal selected from the group consisting of alkali and alkaline earth metals with formic acid in the presence of water to form a reaction mixture at a pH of less than 7.0 and in which the hydroxyl sites of the compound have been converted to formates;
- thereafter adding stepwise alternate incremental portions of bromine and the basic compound while maintaining the pH less than 7.0 until the reaction is complete in order to control evolution of carbon dioxide.
A stable process for preparing aqueous calcium bromide without excessive foaming comprising the steps of:
- reacting a less than equivalent amount of a basic compound selected from the group consisting of calcium hydroxide, calcium oxide and calcium carbonate with formic acid in the presence of water to form a reaction mixture at a pH less than 7.0 and in which hydroxyl sites of the compound have been converted to formate;
- thereafter adding stepwise, alternate incremental portions of bromine and the basic compound while maintaining the pH less than 7.0 until the reaction is complete in order to control evolution of carbon dioxide.
A stable process for preparing calcium bromide without excessive foaming comprising the steps of:
- reacting about one-half equivalent of lime with a slight excess of formic acid in the presence of water to form a reaction mixture at a pH of less than 7.0 thereafter adding to the reaction mixture stepwise alternate incremental portions of bromine and lime in accordance with the sequence:
- about 0.35 equivalent bromine
- about 0.19 equivalent lime
- about 0.35 equivalent bromine
- about 0.16 equivalent lime
- about 0.20 equivalent bromine
- about 0.15 equivalent lime
- about 0.10 equivalent bromine;
- in order to control evolution of carbon dioxide;
- and
- adjusting the pH of the final reaction mixture to a level of at least 7.0 in order to neutralize the reaction mixture.
8 more elements
Dependencies are inferred from the claim text.