A process for inhibiting unwanted free-radical polymerization of acrylic acid present in a liquid phase P whose acrylic acid content is at least 10% by weight and which, based on the weight of the acrylic acid present therein, additionally comprises at least 100 ppm by weight of propionic acid and at least 100 ppm by weight of glyoxal, in which at least one chemical compound of the element copper is added to the liquid phase P, and the resulting liquid phases P to which a chemical compound of the element copper has been added.

Claims

36 · 2 independent · depth 3

36 granted claims

›1.independentA process, comprising:nadding at least one chemical compound that comprises copper to a liquid phase P, said liquid phase P comprises acrylic acid, pr…+16

›2.↳ 1The process according to claim 1, wherein the at least one chemical compound is present in said liquid phase P in an amount, based on the molar amount…d2

›3.↳ 1The process according to claim 1, wherein the at least one chemical compound is present in said liquid phase P in dispersed form, in dissolved form, o…d2

›4.↳ 1The process according to claim 1, wherein the liquid phase P further comprises at least 1% by weight of water.d2

›5.↳ 1The process according to claim 1, wherein the liquid phase P, based on the weight of the acrylic acid present therein, further comprises â‰§100 ppm by…d2

›6.↳ 1The process according to claim 1, wherein the acrylic acid present in the liquid phase P is the product of a heterogeneously catalyzed partial oxidati…d2+1

›8.↳ 1The process according to claim 1, wherein the acrylic acid present in the liquid phase P is the product of a heterogeneously catalyzed partial oxidati…d2

›9.↳ 1The process according to claim 1, wherein the acrylic acid present in the liquid phase P is the product of a heterogeneously catalyzed partial oxidati…d2

›10.↳ 1The process according to claim 1, wherein the at least one chemical compound is in the form of a salt.d2

›11.↳ 1The process according to claim 1, wherein the at least one chemical compound is present in said liquid phase P in an amount, based on the molar amount…d2

›12.↳ 1The process according to claim 1, wherein said acrylic acid is present in said liquid phase P in an amount of at least 90% by weight of said liquid ph…d2

›13.↳ 1The process according to claim 1, wherein said acrylic acid is present in said liquid phase P in an amount of at least 98% by weight of said liquid ph…d2

›14.↳ 1The process according to claim 1, wherein said glyoxal is present in said liquid phase P in an amount of from 100 to 2,500 ppm by weight.d2

›15.↳ 1The process according to claim 1, wherein the liquid phase P further comprises from 1% to 5% by weight of water.d2

›16.↳ 1The process according to claim 1, wherein said propionic acid is present in said liquid phase P in an amount of from 150 to 2500 ppm.d2

›17.↳ 1The process according to claim 1, wherein the at least one chemical compound is present in said liquid phase P in an amount, based on the molar amount…d2

›18.independentA liquid phase P whose acrylic acid content is at least 10% by weight and which, based on the weight of the acrylic acid present therein, additionally…+18

›19.↳ 18The liquid phase P according to claim 18, which additionally comprises at least one inhibitor selected from the group consisting of a nitroxyl radical…d2

›20.↳ 18The liquid phase P according to claim 18, which comprises, based on the weight of the acrylic acid present therein, additionally 50 to 1000 ppm by wei…d2

›21.↳ 18The liquid phase P according to claim 18, wherein the at least one chemical compound of the element copper is present in said liquid phase P in an amo…d2

›22.↳ 18The liquid phase P according to claim 18, wherein the at least one chemical compound of the element copper is present in said liquid phase P in disper…d2

›23.↳ 18The liquid phase P according to claim 18, which further comprises at least 1% by weight of water.d2

›24.↳ 18The liquid phase P according to claim 18, which further comprises, based on the weight of the acrylic acid present therein, â‰§100 ppm by weight of di…d2

›25.↳ 18The liquid phase P according to claim 18, wherein the acrylic acid present in the liquid phase P is the product of a heterogeneously catalyzed partial…d2+1

›27.↳ 18The liquid phase P according to claim 18, wherein the acrylic acid present in the liquid phase P is the product of a heterogeneously catalyzed partial…d2

›28.↳ 18The liquid phase P according to claim 18, wherein the acrylic acid present in the liquid phase P is the product of a heterogeneously catalyzed partial…d2

›29.↳ 18The liquid phase P according to claim 18, wherein the at least one chemical compound is in the form of a salt.d2

›30.↳ 18The liquid phase P according to claim 18, wherein the at least one chemical compound is present in said liquid phase P in an amount, based on the mola…d2

›31.↳ 18The liquid phase P according to claim 18, wherein said acrylic acid is present in said liquid phase P in an amount of at least 90% by weight of said l…d2

›32.↳ 18The liquid phase P according to claim 18, wherein said acrylic acid is present in said liquid phase P in an amount of at least 98% by weight of said l…d2

›33.↳ 18The liquid phase P according to claim 18, wherein said glyoxal is present in said liquid phase P in an amount of from 100 to 2,500 ppm by weight.d2

›34.↳ 18The liquid phase P according to claim 18, wherein the liquid phase P further comprises from 1% to 5% by weight of water.d2

›35.↳ 18The liquid phase P according to claim 18, wherein said propionic acid is present in said liquid phase P in an amount of from 150 to 2500 ppm.d2

›36.↳ 18The liquid phase P according to claim 18, wherein the at least one chemical compound is present in said liquid phase P in an amount, based on the mola…d2

Classifications

1 codes

IPC · International Patent Classification

Section C — Chemistry; metallurgy

C07C51/50

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3.8 y

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Peter F Godenschwager

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2 priority documents

Priority

8 Oct 2010

earliest claimed

›Priority documents — 2

Type	Document	Date
provisional	US 61391102	8 Oct 2010
related publication	US 20120085969 A1	12 Apr 2012

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