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US 2003/0155227 A1Published application
Nitrosophenols and C-nitrosoanilines as polymerization inhibitors
AssigneeCrompton Corporation
InventorBrigitte Benage
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Abstract
Inhibitor blends comprising nitrosophenols and nitrosoanilines, optionally in combination with air or oxygen, reduce the premature polymerization of ethylenically unsaturated monomers.
Claims30
A process for inhibiting the premature polymerization of an ethylenically unsaturated monomer during production, distillation, purification or storage of the monomer, which comprises:
- incorporating in the monomer, in an effective inhibiting amount sufficient to prevent premature polymerization during production, distillation, purification or storage of said monomer, a blend comprising at least one nitrosophenol compound and at least one nitrosoaniline compound.
A composition which comprises:
- (a) an ethylenically unsaturated monomer, and
- (b) an effective inhibiting amount, sufficient to prevent premature polymerization of said ethylenically unsaturated monomer, of a blend comprising at least one nitrosophenol compound and at least one nitrosoaniline compound.
A method for distilling a feed comprising at least one polymerizable ethylenically unsaturated monomer, said method comprising the steps of:
- introducing a feed comprising at least one polymerizable ethylenically unsaturated monomer into a distillation apparatus;
- introducing an effective inhibiting amount, sufficient to prevent premature polymerization of said ethylenically unsaturated monomer, of a blend comprising at least one nitrosophenol compound and at least one nitrosoaniline compound into said distillation apparatus;
- and
- distilling said feed under distillation conditions in the presence of said inhibitor blend to recover from said distillation apparatus an overhead product of high purity ethylenically unsaturated monomer and a residual bottoms fraction having a reduced content of polymeric material.
1 more element
Dependencies are inferred from the claim text.