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AssigneeCosden Technology, Inc.
InventorsJames M. Watson, William J. I. Bracke
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A method for inhibiting the formation of undesired polymer accumulations during distillative purification of vinylaromatic monomers such as styrene, alpha-alkylstyrene, vinyltoluene, divinylbenzene or the like comprising distilling the vinylaromatic monomer in the presence of a cupreous material such as metallic copper or a copper alloy, and apparatus for carrying out the method in which at least a portion of the interior of a distillation column used to purify vinylaromatic monomer, particularly in areas where there is little vapor movement, is provided with a surface layer or coating of cupreous material.
A method for inhibiting the formation of polymerized vinylaromatic compounds during distillative purification of vinylaromatic monomer from a crude feed comprising vinylaromatic monomer admixed with lower and higher boiling materials, said method comprising distilling said vinylaromatic monomer from said crude feed in the presence of a cupreous metallic surface on the interior of a distillation column used to effect said distillation.
Dependencies are inferred from the claim text.