Method for preparing pesticide by taking isocyanate as intermediate

A technology of isocyanate and isocyanate solution, which is applied in the preparation of isocyanate derivatives, chemical instruments and methods, and the preparation of organic compounds, etc. It can solve the problem that phosgene cannot be completely absorbed, the concentration of isocyanate is unstable, and the stability of product quality is affected. problems, to achieve the effect of low cost, solvent saving, and less by-products

Active Publication Date: 2015-03-11
QINGDAO UNIV OF SCI & TECH +1
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Problems solved by technology

In this process, the amount of phosgene entering the phosgene absorption tower is unstable, resulting in an unstable amount of solvent used to absorb phosgene. If the amount of solvent is too low, phosgene cannot be completely absorbed; if the amount of solvent is too high, it

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  • Method for preparing pesticide by taking isocyanate as intermediate
  • Method for preparing pesticide by taking isocyanate as intermediate

Examples

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Embodiment 1

[0027] In this example, to prepare a pesticide product using 3,5-dichlorophenylisocyanate as an intermediate, 500kg of 3,5-dichloroaniline and 2000kg of chlorobenzene were mixed to form an amine solution with a mass concentration of 20%; Put the amine solution with a flow rate of 625kg / h and the phosgene with a flow rate of 300kg / h into the cold reaction kettle for cold photochemical reaction. The reaction temperature is 5°C, the pressure is normal pressure, and the reaction time is 4h; The thermal photochemical reaction is carried out in the photochemical kettle, the reaction temperature is 120°C, the pressure is normal pressure, the reaction time is 5h until the solution is transparent; the HCL gas and unreacted phosgene generated by the reaction enter the phosgene absorption tower, and then the temperature is - Chlorobenzene at 15°C with a flow rate of 1000kg / h absorbs phosgene, and the absorption liquid is returned to the cold reaction kettle, and the mass content of phosge...

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Abstract

The invention belongs to the technical field of pesticide preparation, and relates to a method for preparing a pesticide by taking isocyanate as an intermediate, based on a current pesticide preparation apparatus, a solvent remove apparatus composed of a solvent removing tower, a condenser and a reboiler is additionally installed between the phosgene removal and pesticide production processes, the phosgene-removing discharging liquid is introduced in the solvent removing tower for rectification and separating, the solvent used for absorbing phosgene and separated from the top of the solvent removing tower is returned to the absorbing tower for phosgene absorption, an isocyanate solution separated from the column bottom of the solvent removing tower can satisfy concentration requirement for pesticide production, product stability can be realized, preparation technology is simple, raw material is easily available, cost is low, by-product is less, concentration of the prepared pesticide product is stable, and the pesticide is environment friendly product.

Description

Technical field: [0001] The invention belongs to the technical field of pesticide preparation, and relates to a method for preparing pesticides using isocyanate as an intermediate. Background technique: [0002] Pesticide products prepared with isocyanates as intermediates have remarkable effects in insecticide and weed control, such as diuron, isoproturon and chlorotoluron; in traditional techniques, amine solutions undergo phosgenation to generate isocyanate solutions, The tail gas containing phosgene and HCL produced in the photochemical process goes to the phosgene absorption tower to absorb phosgene, and returns to the reactor, and the isocyanate solution is further reacted to form the final pesticide product. After the product is separated, the solvent is distilled out to absorb phosgene and prepare the amine solution. In this process, the amount of phosgene entering the phosgene absorption tower is unstable, resulting in an unstable amount of solvent used to absorb p...

Claims

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Application Information

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IPC IPC(8): C07C265/12C07C263/10
Inventor 毕荣山谭心舜郑世清曾民成葛纪军韩传贵张波
Owner QINGDAO UNIV OF SCI & TECH
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