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Method for preparing high yield pinacolone, and pesticide bactericide

A pinaconone, high-yield technology, applied in the chemical industry, can solve the problems of increased production cost of pinaconone, low conversion rate, long reaction time, etc., and achieves the effects of low equipment requirements, low cost and simple process

Inactive Publication Date: 2015-10-07
ZHANGJIAGANG CITY ZHENFANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Cool the 30% hydrochloric acid solution to 0°C, then add isopentene to the hydrochloric acid solution, raise the temperature to 30°C, the heating time is 6 hours, and then continue to heat up to 70°C in the shrinkage tank, the heating time is 6 hours , to obtain isopentyl chloride.

[0014] During the heating process, formaldehyde is added dropwise to chloroisopentane for condensation reaction. The molar ratio of chloroisopentane to formaldehyde is 1:1.2. The final temperature of the heating is 90°C, and the heating time is 6 hours. The heating is completed. Then keep warm for 2 hours.

[0015] The layers were separated, and the upper oil phase was de-rectified to obtain pinatone with a yield of 87.2%.

Embodiment 2

[0017] Cool the 30% hydrochloric acid solution to 0°C, then add isopentene to the hydrochloric acid solution, raise the temperature to 30°C, the heating time is 6 hours, and then continue to heat up to 70°C in the shrinkage tank, the heating time is 6 hours , to obtain isopentyl chloride.

[0018] During the heating process, formaldehyde is added dropwise to chloroisopentane for condensation reaction. The molar ratio of chloroisopentane to formaldehyde is 1:1.5. The final temperature of heating is 90°C, and the heating time is 6 hours. The heating is completed. Then keep warm for 2 hours.

[0019] The layers were separated, and the upper oil phase was de-rectified to obtain pinatone with a yield of 84.5%.

Embodiment 3

[0021] Cool the 30% hydrochloric acid solution to 0°C, then add isopentene to the hydrochloric acid solution, raise the temperature to 30°C, the heating time is 6 hours, and then continue to heat up to 70°C in the shrinkage tank, the heating time is 6 hours , to obtain isopentyl chloride.

[0022] During the heating process, formaldehyde is added dropwise to chloroisopentane for condensation reaction. The molar ratio of chloroisopentane to formaldehyde is 1:1.4. The final temperature of the heating is 90°C, and the heating time is 6 hours. The heating is completed. Then keep warm for 2 hours.

[0023] The layers were separated, and the upper oil phase was de-rectified to obtain pinatone with a yield of 85.4%.

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PUM

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Abstract

The invention discloses a method for preparing high yield pinacolone, and a pesticide bactericide. The pinacolone preparation method is characterized in that pinacolone is synthesized through adopting an isoamyl alcohol technology, hydrochloric acid is adopted as a catalyst, JB is adopted as a polymerization inhibitor, a molar ratio of isoamyl chloride to formaldehyde is 1:1.2-1:1.5, and a condensation reaction is carried out at 60-90DEG C for 6-10h. The method has the advantages of simple process, low requirements on a device, and low cost, and the yield of pinacolone obtained through the method is greater than 85%.

Description

technical field [0001] The application belongs to the field of chemical technology, and in particular relates to a method for preparing high-yield pinacolone and a pesticide fungicide. 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-dimeth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/45C07C49/04A01N35/02A01P3/00A01P1/00
CPCC07C45/45A01N35/02C07C17/08
Inventor 曹爱春赵松雪郁培华
Owner ZHANGJIAGANG CITY ZHENFANG CHEM
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