Great Lakes Chemical Corporation

John E Hill

Nicolai A Favstritsky

Rastko I Mamuzic

Bhabatosh Bhattacharya

James T Ayres

Preston E Spires

John L Burba, Iii

A method of preparing tetrabromobenzoate compounds from tetrabromophthalic anhydride by reacting tetrabromophthalic anhydride with alcohol in the presence of a decarboxylation catalyst. The reaction may be carried out in an excess of alcohol, or with a near stoichiometric amount of alcohol by performing the reaction in an inert solvent.

One-pot synthesis of ring-brominated benzoate compounds

A process to manufacture high purity thionyl chloride and phosphorus oxychloride utilizing a fluctuating flow of sulfur dioxide. Chlorine, sulfur dioxide, and phosphorus trichloride are reacted in a process that limits the amount of sulfuryl chloride and/or phosphorus trichloride remaining in the product stream. Cl.sub.2 and SO.sub.2 are first reacted to form SO.sub.2 Cl.sub.2, which, in turn, is reacted with excess PCl.sub.1 to form the products, POCl.sub.3 and SOCl.sub.2. Any excess PCl.sub.3 is then reacted with additional Cl.sub.2 and SO.sub.2 to form additional product. Alternatively, Cl.sub.2, SO.sub.2, and PCl.sub.13 are reacted directly to form POCl.sub.3 and SOCl.sub.2 without the formation of any SO.sub.2 Cl.sub.2 intermediate by utilizing a continuous stirred loop reactor.

Preparation of thionyl chloride and phosphorus oxyhloride from sulfur

Described are preferred processes which produce methyl mercaptan from methyl bromide and aqueous mediums of metal hydrosulfide. The processes can be used to simultaneously consume methyl bromide byproduct and aqueous NaSH byproduct while producing methyl mercaptan.

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West Lafayette, IN, United States of America

John E Hill