Production method for carbonate compound and methacrylate or ester thereof

摘要

The present invention relates to a method for producing a carbonate compound and methacrylic acid or an ester thereof, containing a step (a1) of obtaining hexachloroacetone and hydrogen chloride from acetone and chlorine molecule, a step (a2) of obtaining a dialkyl carbonate and chloroform from hexachloroacetone and an alkyl alcohol, a step (b1) of obtaining 1,1,1-trichloro-2-methyl-2-propanol from chloroform and acetone, a step (b2+b3 or b4) of obtaining methacrylic acid or an ester thereof and hydrogen chloride from 1,1,1-trichloro-2-methyl-2-propanol and water or an alcohol, and a step (c1 or c2) of obtaining chlorine molecule by reacting hydrogen chloride with oxygen molecule.

主权项

1. A method for producing a carbonate compound and methacrylic acid or an ester thereof, comprising:
(a1) a step of reacting acetone with chlorine molecule to obtain hexachloroacetone and hydrogen chloride, (a2) a step of reacting the hexachloroacetone obtained in the step (a1) with an alkyl alcohol having a carbon number of from 1 to 10 to obtain a dialkyl carbonate and chloroform, (b1) a step of reacting chloroform with acetone to obtain 1,1,1-trichloro-2-methyl-2-propanol, (b2) a step of reacting the 1,1,1-trichloro-2-methyl-2-propanol obtained in the step (b1) with water or an alcohol that has a carbon number of from 1 to 10 in which a part or all of hydrogen atoms bonded to carbon atoms may be replaced by halogen atom(s) and/or deuterium atom(s), to obtain 2-chloro-2-methylpropanoic acid or an ester thereof and hydrogen chloride, (b3) a step of obtaining methacrylic acid or an ester thereof and hydrogen chloride from the 2-chloro-2-methylpropanoic acid or the ester thereof obtained in the step (b2), and (c1) a step of reacting the hydrogen chloride obtained in the step (a1), the step (b2), and the step (b3) with oxygen molecule to obtain chlorine molecule, wherein the step (b2) contains reacting the 1,1,1-trichloro-2-methyl-2-propanol obtained in the step (b1) in the presence of a Lewis acid catalyst at a temperature lower than the boiling point of the 1,1,1-trichloro-2-methyl-2-propanol, after the chloroform is obtained in the step (a2), the chloroform obtained in the step (a2) is used as at least a part of the chloroform in the step (b1), and after the chlorine molecule is obtained in the step (c1), the chlorine molecule obtained in the step (c1) is used as at least a part of the chlorine molecule in the step (a1).