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Process for preparing pinacolone and compound catalyst

A composite, catalyst technology, applied in the condensation preparation of carbonyl compounds, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of increasing the production cost of pinacolone, reducing the economic benefits of enterprises, Long reaction time and other problems, to achieve the effect of reducing production costs, considerable economic benefits, and short reaction time

Inactive Publication Date: 2013-08-14
ZHANGJIAGANG CITY ZHENFANG CHEM
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Problems solved by technology

[0003] However, the existing technology for the preparation of 5-methyl-6,6-dimethyl-1,3-dioxocyclohexane mainly has the problems of low conversion rate and long reaction time, which indirectly causes frequent Which ketone production costs increase, thereby reducing the economic benefits of the enterprise

Method used

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  • Process for preparing pinacolone and compound catalyst

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Experimental program
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Effect test

Embodiment

[0015] 1. Preparation of pinacolone: ​​Condensation reaction of pentachloride and formaldehyde under acidic conditions, catalyzed by Zn / Co / Sb composite catalyst, the reaction temperature is 60-95°C, and the reaction time is 4-5h.

[0016] 2. The condensation product pinacolone is assayed using a gas chromatograph with a hydrogen flame, and the parameters set are:

[0017] Chromatographic column: 30m×0.3mm, film thickness 0.45μm, 0V-01 capillary column, sensitivity (yang)=1, split ratio 1:100, carrier gas is nitrogen, detection chamber temperature 180°C, vaporization chamber temperature 180°C, column The initial temperature was 50°C, kept for 2 minutes, and then raised to 100°C at a rate of 10°C / min.

[0018] The effects of Zn / Co / Sb composite catalyst, reaction temperature and reaction time on the content and yield of pinacolone are studied respectively below.

[0019] 1. Effect of Zn / Co / Sb composite catalyst on pinacolone content and yield

[0020] Restricted condition: the ...

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Abstract

The invention discloses a process for preparing pinacolone. The process is characterized by comprising the following steps of: performing condensation reaction of chloro tertpentane and formaldehyde under an acidic condition, and catalyzing by a Zn / Co / Sb compound catalyst, wherein the reaction temperature is 60-95 DEG C and the reaction time is 4-5 hours; the molar ratio of the components in the Zn / Co / Sb compound catalyst is 1:1:1. The process disclosed by the invention has the beneficial effects that the Zn / Co / Sb compound catalyst catalyzes condensation reaction of chloro tertpentane and formaldehyde, so that not only is the process step concise and the process is easy to operate and realize, but also the conversion ratio is high and the reaction time is short. The yield can be improved by 8-15%, and the condensation time can be shortened by over 1 / 3, so that the production cost is effectively lowered, and the economic benefit is considerable.

Description

technical field [0001] The invention relates to a process for preparing pinacolone and a composite catalyst used in the process, belonging to the technical field of chemical industry. Background technique [0002] Pinacolone, mainly used in the production of triazole pesticides, is also used in the production of herbicides and pharmaceutical products, and is one of the important chemical raw materials. In the preparation process of pinacolone, the intermediate chloropentane is usually placed under acidic conditions, and formaldehyde is added and reacted at 90-95°C for 2 hours to generate 5-methyl-6,6-di Methyl-1,3-dioxocyclohexane is decomposed and rearranged into pinacolone, so 5-methyl-6,6-dimethyl-1,3-dioxocyclohexane is prepared Pinacolone is a very important intermediate, and its content and production cost are directly related to the quality, yield and production cost of pinacolone. [0003] However, the existing technology for the preparation of 5-methyl-6,6-dimethy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/843C07C49/04C07C45/45
Inventor 曹爱春葛鹏圣郁培华钱志强
Owner ZHANGJIAGANG CITY ZHENFANG CHEM
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