A kind of preparation technology of fungicide tebuconazole with pentanone

A preparation process, the technology of tebuconazole, is applied in the field of preparation of pentanone for fungicide tebuconazole, which can solve the problems of low transparency, low content, low yield, etc., so as to increase the service life, solve large side reactions, reduce dangerous effect

Active Publication Date: 2016-05-25
YANCHENEG HUIHUANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Occurred at present is a kind of novel bactericide tebuconazole, and its bactericidal effect is good, and pollution is little, and the harm to environment is also little, is a kind of comparatively ideal bactericide, but, the main material pentaconazole of existing tebuconazole The preparation process of ketone is relatively backward. Most of them are condensed with p-chlorobenzaldehyde and pinacolone, and then hydrogenated to make products. There are disadvantages such as low content, low yield, and low transparency, which seriously restrict the development of tebuconazole

Method used

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Embodiment

[0017] A preparation process of pentanone for a new type of fungicide tebuconazole: Put enone into methanol, use a beater for high-speed beating, then add a catalyst, hydrogenate to prepare pentanone, and use hydrochloric acid neutralization and water washing technology and high-speed separation technology Washing to prepare pentanone for new fungicide tebuconazole.

[0018] In this embodiment, the working temperature in the beater is room temperature. The air pressure when adding the catalyst is 25-30Mpa. The temperature when the catalyst is introduced is 25-30°C.

[0019] In addition, this embodiment also provides a hydrochloric acid neutralization and water washing technology, which is to add a small amount of hydrochloric acid to the methanol solvent agent, add a certain amount of sodium chloride aqueous solution after distilling the methanol to prepare a washing solution, and wash the pentanone. In order to ensure the process effect, a small amount of hydrochloric acid ...

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Abstract

The invention discloses a preparation process for ketene used for a novel bactericide--tebuconazole. The preparation process is characterized by comprising the following steps: adding ketene into methanol, carrying out high speed beating with a beater, then adding a catalyst, carrying out hydrogenation to prepare pentanone and carrying out washing by using hydrochloric acid neutralization washing technology and high speed separation technology so as to prepare ketene used for the novel bactericide--tebuconazole. The preparation process provided by the invention overcomes the problems of a high hydrogenation temperature, hydrogenation safety and a great side reaction in the prior art, prolongs the service life of reaction equipment, reduces reaction danger and allows dechlorinated pentanone produced in a side reaction to decrease from original 0.25% to less than 0.1%, p-chlorobenzyl alcohol to decrease from original 0.4% to 0.2% and the main content of pentanone to increase to more than 99% from original 98%.

Description

technical field [0001] The invention relates to a preparation process of pentanone for fungicide tebuconazole. Background technique [0002] Fungicides are a class of pesticides used to prevent and control plant diseases caused by various pathogenic microorganisms, generally referring to fungicides. However, internationally, it is usually used as a general term for agents to prevent and control various pathogenic microorganisms. With the development of fungicides, subclasses such as bactericides, virucides, and algicides are distinguished. According to the survey, there are more than 80,000 kinds of pathogenic microorganisms (fungi, strong bacteria, rickettsia, mycoplasma, viruses, algae, etc.) harmful to plants in the world. The use of fungicides is a cost-effective method of controlling plant diseases. [0003] Early fungicides were all inorganic compounds, among which sulfur powder and copper preparations (such as Bordeaux mixture) are still used today. In the 1940s a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C49/04C07C45/62
CPCC07C45/62C07C49/04
Inventor 曹爱春葛鹏圣郁培华钱志强
Owner YANCHENEG HUIHUANG CHEM
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