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Method for producing pmida

A technology of bisglyphosate and iminodiacetonitrile, which is applied in the chemical industry and can solve problems such as long process flow, high production cost, and large environmental pollution

Inactive Publication Date: 2015-04-29
赵明贵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the preparation of high-purity iminodiacetic acid solid needs to acidify the intermediate iminodiacetic acid disodium salt with sulfuric acid, convert it into iminodiacetic acid, and then prepare it through the processes of concentration, crystallization, separation and drying. There is a process flow Long, low product yield, high production cost, large environmental pollution and other shortcomings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1, a method for producing diglyphosate, the method comprises the following steps: mixing iminodiacetonitrile, acidic catalyst and water, stirring and heating, the temperature is controlled at 50°C, adding phosphorous acid, chlorinated A mixture of ammonium, hydrochloric acid, and iminodiacetic acid hydrochloride, then add paraformaldehyde at a temperature of 110°C, and keep warm for 5 hours to obtain a suspension of diglyphosate, which is cooled, filtered, and washed and drying to obtain bisglyphosate. Described iminodiacetonitrile accounts for 36% of raw material gross weight.

Embodiment 2

[0009] Embodiment 2, a method for producing diglyphosate, the method comprises the following steps: mixing iminodiacetonitrile, acidic catalyst and water, stirring and heating, the temperature is controlled at 60°C, adding phosphorous acid, chlorinated A mixture of ammonium, hydrochloric acid, and iminodiacetic acid hydrochloride, then add paraformaldehyde at a temperature of 120°C, and keep warm for 3 hours to obtain a suspension of diglyphosate, which is cooled, filtered, and washed and drying to obtain bisglyphosate. The iminodiacetonitrile accounts for 38% of the total weight of raw materials.

Embodiment 3

[0010] Embodiment 3, a method for producing diglyphosate, the method comprises the following steps: mixing iminodiacetonitrile, acidic catalyst and water, stirring and heating, the temperature is controlled at 40°C, adding phosphorous acid, chlorinated A mixture of ammonium, hydrochloric acid, and iminodiacetic acid hydrochloride, then add paraformaldehyde at a temperature of 100°C, and keep warm for 8 hours to obtain a suspension of diglyphosate, which is cooled, filtered, and washed and drying to obtain bisglyphosate. The iminodiacetonitrile accounts for 35% of the total weight of raw materials.

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PUM

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Abstract

The invention relates to the technical field of chemical industry and particularly relates to a method for producing pmida. The method comprises the following steps: mixing iminodiacetonitrile and an acid catalyst with water, stirring, heating, controlling the temperature within 40-60 DEG C, adding the mixed liquor of phosphorous acid, ammonium chloride, hydrochloric acid and iminodiacetic acid hydrochloride within 30-60 minutes, adding paraformaldehyde at a temperature not lower than 100 DEG C, reacting for 3-8 hours in a heat preservation manner to obtain pmida suspension, and cooling, filtering, washing and drying the suspension to prepare the pmida. The purpose of the invention is to provide a method for producing pmida, which is simple to operate, high in product yield and small in pollution.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for producing diglyphosate. Background technique [0002] Diglyphosate (PMIDA) is the main chemical intermediate for the production of the broad-spectrum herbicide glyphosate, and has a broad market prospect. The traditional preparation method of diglyphosate is the iminodiacetic acid (IDA) method developed by U.S. Monsanto Company, that is, with hydrocyanic acid or diethanolamine as starting raw material, first prepare high-purity iminodiacetic acid solid, and then combine with phosphorous acid Or phosphorus trichloride, formaldehyde carry out condensation reaction to prepare bisglyphosate. Among them, the preparation of high-purity iminodiacetic acid solid needs to acidify the intermediate iminodiacetic acid disodium salt with sulfuric acid, convert it into iminodiacetic acid, and then prepare it through the processes of concentration, crystallization, separ...

Claims

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Application Information

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IPC IPC(8): C07F9/38
Inventor 赵明贵
Owner 赵明贵