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Method of 4-hydroxy-3-hexanone catalytic dehydration

A technology for catalytic dehydration and hexanone, applied in chemical instruments and methods, molecular sieve catalysts, carbon-based compound preparation, etc., can solve the problems of high reaction temperature, low space velocity, and poor catalyst activity.

Inactive Publication Date: 2013-04-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is the problem of high reaction temperature, low space velocity and poor catalyst activity in the prior art, and a new method for catalytic dehydration of 4-hydroxy-3-hexanone is provided

Method used

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  • Method of 4-hydroxy-3-hexanone catalytic dehydration
  • Method of 4-hydroxy-3-hexanone catalytic dehydration

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The performance evaluation of the catalyst was carried out on a fixed-bed reaction device at normal pressure. A stainless steel reactor with an inner diameter of 10 mm was used. The loading amount of the catalyst was 10 ml, the reaction temperature was 350 °C, and the liquid space velocity was 1 hour. -1 , reacted under normal pressure. Reaction product analysis adopts HP 6890 gas chromatography, hydrogen flame detector, HP-6 capillary column (60m * 0.25mm * 0.25μm), catalyst is Al-MCM-41, its SiO 2 / Al 2 o 3 The molar ratio was 50. The reaction results are shown in Table 1.

Embodiment 2～12

[0016] According to each step of [embodiment 1], just catalyzer adopts different catalyzer, and concrete test condition and reaction result are shown in Table 1.

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Abstract

The present invention relates to a method of 4-hydroxy-3-hexanone catalytic dehydration, and mainly solves the problem of low catalyst activity, high reaction temperature and low space velocity in the prior art. According to the invention, 4-hydroxy-3-hexanone is used as a raw material, and the reaction raw material is in contact with a catalyst to produce 4-hexen-3-one at the conditions of a reaction temperature of 200-400 DEG C and the space velocity of 0.5-15 hr-1 with respect to the mass of 4-hydroxy-3-hexanone liquid, wherein the catalyst is at least one selected from the group consisting of Al-MCM-41, Al-MCM-48, Al-SBA-15, Al-HMS, Al-MSU-1 or Al-MSU-2. The technical solution solves the problem preferably. The method can be used in the industrial production of 4-hexen-3-one from 4-hydroxy-3-hexanone.

Description

technical field [0001] The invention relates to a method for catalytic dehydration of 4-hydroxyl-3-hexanone. Background technique [0002] 4-Hexen-3-one (CAS: 2497-21-4) is a unique spice (China GB 2760-2007), which is mainly used to prepare food flavors such as Laomu, butter, and horseradish, and has a wide range of uses. [0003] The dehydration reaction of hydroxyl compounds is a reaction in which the hydroxyl and hydrogen atoms on two adjacent atoms in the reactant molecule are removed in the form of water in the presence of a catalyst. Since the oxygen atom of the hydroxyl group contains a lone pair of electrons, it can combine with a proton (H+) to form an oxonium ion. Since the oxygen atom is positively charged, it becomes a strong electron-withdrawing group, which makes the C-O bond easy to dissociate. The whole dehydration reaction includes: generating protonated oxonium salt (R-OH 2 + ), the oxonium salt slowly dissociates into a carbanion, and a hydrogen ion is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/203C07C45/66B01J29/70B01J29/03
Inventor 李亚男金照生徐菁
Owner CHINA PETROLEUM & CHEM CORP
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