Method for inhibiting polymerization of a vinyl compound
AssigneeNippon Shokubai Co., Ltd.
InventorsKazuhiko Sakamoto, Kazuo Ohkouchi, Masahiro Uemura, Sei Nakahara, Masatoshi Ueoka
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Abstract
A method for inhibiting polymerization during transportation, storage and/or production of (meth)acrylic acid or an ester thereof includes adding an N-oxyl compound and water to a vinyl compound; or dissolving an N-oxyl compound in water and adding the solution to a vinyl compound in a process of recovering, purifying, and/or synthesizing of the vinyl compound. The method can effectively inhibit polymerization of the vinyl compound.
Claims10
A method for inhibiting polymerization of a vinyl compound selected from the group consisting of (meth)acrylic acid and esters of (meth)acrylic acid, during its storage and/or its transportation comprising permitting a water soluble N-oxyl compound and 0.01-2 parts by weight of water to coexist in 100 parts by weight of the vinyl compound, wherein the N-oxyl compound is at least one selected from the group consisting of N-oxyl compounds represented by the following general formula:
- wherein R1 represents CHOH, CHCH2OH, CHCH2CH2OH, CHCOOH or C═O, R2 represents H or CH2OH.
A method for inhibiting polymerization of a vinyl compound selected from the group consisting of (meth)acrylic acid and esters of (meth)acrylic acid, comprising the steps of:
- (i) dissolving an N-oxyl compound in water, the amount of water being 1 to 1000 times by weight that of the N-oxyl compound;
- the amount of water being 0.0005 to 10 parts by weight per 100 parts by weight of the vinyl compound;
- and the amount of the N-oxyl compound being 0.0005 to 0.1 parts by weight per 100 parts by weight of the vinyl compound;
- and
- (ii) adding the solution to the vinyl compound in a process of recovering, purifying, and/or synthesizing of the vinyl compound.
Dependencies are inferred from the claim text.