Method for separating and purifying 2-chloro-3-trifluoromethylpyridine
AssigneeIshihara Sangyo Kaisha, Ltd.
InventorTakayoshi ANDO
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Abstract
A method for separating and purifying 2-chloro-3-trifluoromethylpyridine useful as an intermediate for medicines, agrochemicals, and the like is provided. The method includes: 1) in the process of producing chloro β-trifluoromethylpyridine compounds by allowing a β-methylpyridine compound to react with chlorine and hydrogen fluoride in a reaction apparatus, allowing a β-trifluoromethylpyridine compound to react with chlorine in a reaction apparatus, or allowing a chloro β-trichloromethylpyridine compound to react with hydrogen fluoride in a reaction apparatus, 2) fractionating a liquid mixture containing chloro β-trifluoromethylpyridine compounds from the reaction apparatus, and 3) separating and purifying 2-chloro-3-trifluoromethylpyridine from the liquid mixture.
Claims8
A method comprising:
- 1) in the process of producing chloro β-trifluoromethylpyridine compounds by allowing a β-methylpyridine compound to react with chlorine and hydrogen fluoride in a reaction apparatus, allowing a β-trifluoromethylpyridine compound to react with chlorine in a reaction apparatus, or allowing a chloro β-trichloromethylpyridine compound to react with hydrogen fluoride in a reaction apparatus,
- 2) fractionating a liquid mixture containing chloro β-trifluoromethylpyridine compounds from the reaction apparatus, and
- 3) separating and purifying 2-chloro-3-trifluoromethylpyridine from the liquid mixture.
Dependencies are inferred from the claim text.