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US 6,673,879 B2Granted
Use of diamines and alkanolamines to inhibit unsaturated monomer polymerization
AssigneeBaker Hughes Incorporated
InventorMuslim D. Shahid
Life of this patent
Estimating the term…
Abstract
It has been discovered that the polymerization of unsaturated compounds, such as butadiene, may be inhibited by the addition of a diene and/or alkanolamine inhibitor. The inhibitor is believed to catalytically destroy peroxides present, such as hydrogen peroxide, which may be present in trace amounts. Particularly useful inhibitors include, but are not limited to, ethylenediamine (EDA) and monoethanolamine (MEA).
Claims12
A composition inhibited against monomer polymerization comprising:
- at least one peroxide;
- at least one unsaturated monomer that can be polymerized by free radicals generated by the at least one peroxide;
- and
- a polymerization-inhibiting amount of an inhibitor selected from the group consisting of diamines, alkanolamines, and mixtures thereof, where the diamines have the structure:
- X1X2NCH2CH2NY1Y2
- where X1, X2, Y1 and Y2 are independently selected from the group consisting of hydrogen, straight or branched alkyl groups of 1 to 20 carbon atoms and alkylaryl group of 1 to 20 carbon atoms.
3 more elements
A composition inhibited against monomer polymerization comprising:
- at least one peroxide;
- at least one unsaturated monomer that can be polymerized by free radicals generated by the at least one peroxide, where the unsaturated monomer is selected from the group consisting of styrene, α-methyl styrene, acrylic acid and esters thereof, vinyl acetate, acrylonitrile, acrylamide, methacrylamide, 1,3-butadiene, isoprene, chloroprene and mixtures thereof;
- and
- a polymerization-inhibiting amount of an inhibitor selected from the group consisting of diamines, alkanolamines, and mixtures thereof
- where the diamines have the structure:
- X1X2NCH2CH2NY1Y2
- where X1, X2, Y1, and Y2 are independently selected from the group consisting of hydrogen, straight or branched alkyl groups of 1 to 20 carbon atoms and alkylaryl groups of 1 to 20 carbon atoms, and
- where the alkanolamines have the structure:
- X1X2NCH2CH2NOH
- where X1 and X2 are as defined above.
7 more elements
Dependencies are inferred from the claim text.