Catalyst for synthesizing glyphosate and method for synthesizing glyphosate by using same

A catalyst and glyphosate technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic chemistry, etc., can solve problems such as low product yield, heavy pollution, and inability to meet the requirements of large-scale production, and achieve high glyphosate Effect of phosphine yield and low impurity content

Active Publication Date: 2013-01-02
JIANGSU YOUTH CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strong oxidant oxidation method has low product yield and high pollution, which cannot meet the requirements of large-scale production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: the preparation I of catalyst

[0038] Get 500g activated carbon (by the weight ratio of peat:wood=7:3, mixed firing, specific surface area 600m 2 / g), put into a 5L three-necked flask, add 4L of 10% dilute nitric acid, heat and stir at 20°C for 10 hours, filter, wash with deionized water three times, and then dry at 40°C to obtain activated carbon catalyst I with a specific surface area of ​​750m 2 / g, the methylene blue adsorption value was 166 mg·g, the iodine adsorption value was 770 mg·g, and the phenol adsorption value was 191 mg·g.

Embodiment 2

[0039] Embodiment 2: the preparation II of catalyst

[0040] Take 500g of activated carbon (same as in Example 1), put it into a 5L three-necked flask, add 4L of 20% dilute nitric acid, heat and stir at 25°C for 14 hours, filter, wash with deionized water for 3 times, and dry at 40°C to obtain an active carbon catalyst Ⅱ, the specific surface area is 810m 2 / g, the methylene blue adsorption value was 180 mg·g, the iodine adsorption value was 790 mg·g, and the phenol adsorption value was 202 mg·g.

Embodiment 3

[0041] Embodiment 3: Preparation I of glyphosate

[0042] With 98% diglyphosate former powder as raw material, activated carbon catalyst I prepared in Example 1 as catalyzer, and oxygen-enriched gas with an oxygen content of 80% (volume ratio) as oxidant; the synthesis method is as follows:

[0043] 1) Put 231.6g of bisglyphosate, 16g of catalyst, and 410g of pure water into a stainless steel high-pressure reactor, stir evenly and heat up to 60~65°C, uniformly feed an oxidant, and control the reaction pressure in the kettle to 0.25~0.35MPa for oxidation. The oxidation process is controlled and analyzed until the conversion rate of the reactant diglyphosate reaches 99.6%, and the reaction is stopped;

[0044] 2) Cool and filter the reacted feed liquid and wash the filter cake with 100g of pure water to obtain 225g of filter cake and 525g of filtrate A;

[0045] 3) Add 200g of pure water to the filter cake, stir evenly, add dropwise 58g of isopropylamine to dissolve glyphosate,...

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Abstract

The invention provides a catalyst for synthesizing glyphosate. The catalyst is an active carbon catalyst, wherein the specific surface area is 700 to 900 m<2> / g, the methylene blue adsorption value is more than 158mg.g, the iodine adsorption value is more than 749mg.g, the phenol adsorption value is more than 179.5mg.g. The invention also provides a method for synthesizing the glyphosate by usingthe catalyst. The catalyst can reduce the generation of formic acid in the glyphosate synthesis process so as to reduce the generation of glyphosate impurities and improve the synthesis yield of the glyphosate, and the synthesis process of the glyphosate has the advantages of energy consumption reduction, environmental friendliness, production cost reduction and the like.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst for synthesizing glyphosate and a method for synthesizing glyphosate using the catalyst. Background technique [0002] Glyphosate is a systemic herbicide that is highly destructive to the underground tissues of perennial weeds, but it loses its activity when it enters the soil. It has no adverse effects on crop growth when it is planted on the same day after the application. Therefore, it is widely used in tea gardens, mulberry gardens, orchards, fallow fields, wheat, rapeseed and other no-tillage fields for weeding before sowing, and for directional spraying between rows in corn and cotton fields to control almost all annual or perennial weeds. [0003] At present, there are many techniques for preparing glyphosate, mainly glycine method and IDA method. At present, the IDA method has gradually become the trend of future development. [0004] The main steps of synthesizing glyphosate by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/18C07F9/38
Inventor 戚明珠王东朝孔勇王宝林杨凡张敏汪国庆
Owner JIANGSU YOUTH CHEM
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