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Production method and device of 3-(ethylthio)butyraldehyde

A technology of ethylthiobutyraldehyde and a production method, which is applied in the methods of chemically changing substances by atmospheric pressure, chemical instruments and methods, preparation of sulfides, etc., can solve the problems of large space occupation, low production efficiency, poor sealing, etc. The problem is to prevent the concentrated heat release of the reaction, stabilize the output, and reduce the difficulty.

Pending Publication Date: 2017-08-11
WEIFANG CYNDA CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The whole set of equipment takes up a lot of space, poor sealing, and low production efficiency

Method used

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  • Production method and device of 3-(ethylthio)butyraldehyde
  • Production method and device of 3-(ethylthio)butyraldehyde
  • Production method and device of 3-(ethylthio)butyraldehyde

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Embodiment 1

[0039] Embodiment one Production equipment involved in the production of the present invention

[0040] Such as figure 1 and figure 2 Shown, the production equipment of 3-ethylthiobutyraldehyde comprises ethanethiol storage tank 1, crotonaldehyde storage tank 2 and catalyst storage tank 3; The catalyst metering pump 6 transports the material to the coil reactor 7 for reaction; the heat transfer oil is used for heating during the reaction, and the heat transfer oil enters through the heat transfer oil inlet 8 at the bottom of the coil reactor 7; The heat-conducting oil outlet 9 leads out; the heat-conducting oil is used to heat the material in the coil 10, and the material enters from the material inlet 11 at the bottom of the coil reactor 7, and passes through the material outlet 12 located at the upper part of the coil reactor 7 after reaction Output; after being condensed by the condenser 13, it can be transported to the finished product storage tank 14 for storage; in ...

Embodiment 2

[0042]Crotonaldehyde is passed through crotonaldehyde metering pump 5 with the flow of 87.5 kilograms per hour, and triethylamine is passed through catalyst metering pump 6 with the flow of 2.5 kilograms per hour, and ethanethiol is passed through ethanethiol metering pump 4 with the flow of 77.7 kilograms per hour, Enter the coil reactor 7 and mix evenly, keep the reaction temperature at 30°C, and the residence time in the coil reactor 7 is 25 minutes. The material passes through the back pressure valve 15 on the material outlet 12 to control the reaction pressure of 20 kg. After the reaction, the material passes through The pipeline enters the product storage tank 14 . The content of the finished product reaches 94%, which is directly used for the next reaction. Because the reaction temperature is controlled at 30° C., the reaction speed is slowed down at a lower temperature, the reaction is incomplete, and condensation through the condenser 13 is not required.

Embodiment 3

[0044] Crotonaldehyde is passed through crotonaldehyde metering pump 5 with the flow of 87.5 kilograms per hour, and triethylamine is passed through catalyst metering pump 6 with the flow of 2.5 kilograms per hour, and ethanethiol is passed through ethanethiol metering pump 4 with the flow of 77.7 kilograms per hour, Enter the coil reactor 7 and mix evenly, keep the reaction temperature at 50°C, and stay in the coil reactor 7 for 20 minutes. The material passes through the back pressure valve 15 on the material outlet 12 to control the reaction pressure of 20 kg. After the reaction, the material passes through After the condenser 13 condenses to 30°C, it enters the finished product storage tank 14 . The content of the finished product reaches 95.4%, which is directly used for the next reaction.

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Abstract

The invention discloses a production method and device of 3-(ethylthio)butyraldehyde. Crotonaldehyde, ethanethiol and a catalyst are pumped into a coil tube reactor according to the mole ratio of (0.9-1.1) to 1 to (0.01-0.03), the temperature is kept to 20-200 DEG C, the pressure is kept to 5-50 kg / m<2>, the time is 5-25 minutes, then the mixture is delivered to a finished product storage tank after cooling, and a finished product is obtained. The raw materials are introduced into the airtight tube reaction, the ethanethiol small volatilization is decreased through pressurized reaction, and the aftertreatment difficult is reduced. The production method and device has the advantages of being simple in reaction process, short in reaction time, good in impermeability, better in safety, high in product content and stable in yield.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a production method and device for 3-ethylthiobutyraldehyde. Background technique [0002] 3-Ethylthiobutyraldehyde is an essential intermediate of cyclohexenone herbicides clethodim and ethoxydim. Cyclohexenone herbicides are highly selective and can control a variety of grass weeds, including annual grass weeds and perennial grass weeds, and are safe for dicotyledonous crops. residual herbicides. [0003] At present, the synthetic main technique of this 3-ethylthiobutyraldehyde is: [0004] [0005] U.S. Patent US4440566 and the Chinese document "Research Progress on the Synthesis of Herbicide Clethodim" introduced that crotonaldehyde and ethanethiol were used as raw materials to synthesize 3-ethylthiobutyraldehyde, and ethanethiol and crotonaldehyde were in the tank reactor. , by stirring, under the action of a catalyst, the 3-ethylthiobutyraldehyde is reacte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J3/04C07C319/18C07C323/22
CPCB01J3/042C07C319/18C07C323/22
Inventor 武宝良杨齐伟王继旋郭天鹅李刚任八玉张瑞杨国坤
Owner WEIFANG CYNDA CHEM
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