Halogen recovery in a wet process for halogenating unsaturated isoolefin copolymer
AssigneeArlanxeo Singapore Pte. Ltd.
InventorAdrian H. Murray
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Abstract
A process for producing a halogenated isoolefin copolymer involves contacting an unsaturated isoolefin copolymer cement, the cement containing an unsaturated isoolefin copolymer dissolved in an organic solvent, under halogenation conditions with a halogenating agent and an aqueous solution of an organic peracid oxidant to form a two-phase reaction medium having an organic phase and an aqueous phase, the organic peracid oxidant capable of converting hydrogen halide to free halogen. The process leads to higher halogen utilization even when the cement contains significant amounts of water and without the use of an emulsifier.
Claims23
A process for producing a halogenated isoolefin copolymer, the process comprising contacting an unsaturated isoolefin copolymer cement, the cement comprising an unsaturated isoolefin copolymer dissolved in an organic solvent and having a water content of 1 wt % or greater based on total weight of the cement, under halogenation conditions with a halogenating agent and an aqueous solution of a C1-20 organic peracid oxidant to form a two-phase reaction medium comprising an organic phase and an aqueous phase, the organic peracid oxidant capable of converting hydrogen halide to free halogen.
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Dependencies are inferred from the claim text.