Preparation method of methyl heptenone

A technology of methyl heptenone and acetone, which is applied in the field of preparation of methyl heptenone, can solve the problem that the catalyst cannot be recycled, achieve high yield, simplify the process, and reduce the effect of process steps

Inactive Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The technical problem to be solved is to solve the problem that the catalyst cannot be recovered in the prior art

Method used

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  • Preparation method of methyl heptenone
  • Preparation method of methyl heptenone
  • Preparation method of methyl heptenone

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Embodiment 1～10

[0020] Add benzyltriethylammonium chloride catalyst, chlorinated isopentene and acetone in the tank reactor, under alkaline conditions, chlorinated isopentene and acetone undergo condensation reaction, after the reaction is completed, the lye is evaporated and concentrated apply. The hydrogenation reaction conditions of each embodiment are shown in Table 1. The content of methyl heptenone in the condensation reaction liquid was determined by gas chromatography, and the conversion rate and selectivity of chloroisoamylene and the yield of methyl heptenone were calculated. The results are shown in Table 2.

[0021] Table 1.

[0022]

[0023]

[0024] Table 2.

[0025]

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Abstract

The invention discloses a preparation method of methyl heptenone. Under an alkaline condition, benzyl quaternary ammonium salt is used as a catalyst, prenyl chloride and acetone are synthetized into methyl heptenone through condensation reaction, salts in the reaction liquid are removed by filtering, by liquid separation, methyl heptenone in oil phase is obtained from upper liquid, and alkaline liquor in which the catalyst is dissolved is obtained from lower liquid. The preparation method has obvious positive effects, the benzyl triethyl ammonium chloride catalyst has relatively high selectivity to condensation reaction of prenyl chloride and acetone, and yield of methyl heptenone is more than 80%. The problem of failure in recycle of a catalyst in the prior art is solved radically. Since the benzyl quaternary ammonium salt has good dissolvability in the alkaline liquor, the catalyst is dissolved in the alkaline liquor after reaction, and in the alkaline liquor recycle process, the catalyst is recycled with the alkaline liquor so as to be reused.

Description

technical field [0001] The invention relates to a method for preparing methyl heptenone, in particular to a method for condensing chlorinated isopentene and acetone into methyl heptenone in the presence of an alkali condensing agent and a specific phase transfer catalyst. Background technique [0002] Methylheptenone, chemical name 6-methyl-5-hepten-2-one, molecular formula C 8 h 14 O, is a colorless or pale yellow liquid with a lemongrass and isobutyl acetate-like aroma. Methyl heptenone has a strong chemical reaction ability and can be derived into many kinds of chemical products. It is an important intermediate in the synthesis of medicines, flavors and fragrances. Methyl heptenone is also used to prepare linalool, citral and pseudoionone The main raw material, which can further prepare vitamin A, vitamin E, vitamin K1 and various spices and flavors. [0003] The synthesis process methods of methylheptenone in the prior art mainly include acetylene-acetone method, isob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/203C07C45/68
CPCY02P20/584C07C45/68
Inventor 黄勇王世明陈洪军祁正娟张正华薛正秀
Owner CHINA PETROLEUM & CHEM CORP
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