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US 5,856,513 AGranted
Process for the preparation of N-alkyl-N'-methylimidazolinium salt of organic acid
AssigneeMitsubishi Chemical Corporation
InventorsMakoto Ue, Masayuki Takeda, Takako Takahashi, Masahiro Takehara
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Abstract
An N-alkyl-N'-methylimidazolinium salt of an organic acid is prepared in high purity and in high yield by (a) preparing an N-alkyl-N'-methylimidazolinium methyl carbonate in a quaternization reaction by methylating an N-alkylimidazoline with dimethyl carbonate and (b) reacting the resulting N-alkyl-N'-methylimidazolinium methyl carbonate with an organic acid, in an anion exchange reaction, wherein the reaction of each step is conducted in methanol solvent.
Claims15
A process for the preparation of an N-alkyl-N'-methylimidazolinium salt of an organic acid, which comprises:
- a) preparing a quaternization product of an N-alkyl-N'-methylimidazolinium methyl carbonate by methylating a N-alkylimidazoline with dimethyl carbonate, and then
- b) reacting a resulting N-alkyl-N'-methylimidazolinium methyl carbonate, in an anion exchange reaction, with an organic acid,
- wherein each of steps a) and b) is conducted in methanol as a solvent, and
- wherein the amount of dimethyl carbonate per mol of N-alkylimidazoline ranges from about 1 to 5 mols, the amount of methanol solvent ranges from 1 to 20 mols per mol of N-alkylimidazoline, and
- wherein said step a) of said process is effected at a temperature in the range of about 110.degree. to 170.degree. Cm and under a pressure of from about 5 to 20 atmospheres.
2 more elements
Dependencies are inferred from the claim text.