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US 5,183,539 AGranted
Method of purifying crude glycidyl (meth)acrylate
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsAkihiro Honma, Masahiro Kurokawa
Life of this patent
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Abstract
A method of purifying a crude glycidyl (meth)acrylate, by (1) subjecting a crude glycidyl (meth)acrylate containing epichlorohydrin and other chlorine compounds as impurities to a stripping treatment with a mixed gas containing oxygen gas in the presence of a quaternary ammonium salt, and then (2) distilling the treated product to obtain a purified glycidyl (meth)acrylate.
Claims5
A method of purifying a crude glycidyl acrylate or a crude glycidyl methacrylate, which comprises:
- (1) subjecting a crude glycidyl acrylate or a crude glycidyl methacrylate containing, as impurities, epichlorohydrin and other chlorine compounds selected from the group consisting of 1,3-dichloro-2-propanol, 2,3-dichloro-1-propanol, glycerin monochlorohydrin, 2-hydroxy-3-chloropropyl acrylate, 2-hydroxy-3-chloropropyl methacrylate, 3-hydroxy-2-chloropropyl acrylate and 3-hydroxy-2-chloropropyl methacrylate to a stripping treatment with a mixed gas containing oxygen gas in the presence of a quaternary ammonium salt, and then
- (2) distilling the treated product to obtain a purified glycidyl acrylate or a purified glycidyl methacrylate,
- wherein the mixed gas is used at a flow rate of 0.1 to 500 ml/minute, as a flow rate at 20.degree. C. under atmospheric pressure, per kilogram of the crude glycidyl acrylate or methacrylate.
Dependencies are inferred from the claim text.