Regeneration method of activated carbon catalyst used for preparing glyphosate

A technology of activated carbon and catalyst, which is applied in the field of regeneration of activated carbon catalyst for glyphosate preparation, can solve problems such as poor effect, achieve low regeneration cost, reduce production cost, and solve the effect of recycling

Active Publication Date: 2015-05-06
中国中化股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is used for the regeneration of the deactivated activated carbon catalyst for the catalytic oxidation of diglyphosate, and the effect is not good. At present, the research on the regeneration of the deactivated activated carbon catalyst for the catalytic oxidation of diglyphosate to glyphosate is still blank at home and abroad.

Method used

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  • Regeneration method of activated carbon catalyst used for preparing glyphosate
  • Regeneration method of activated carbon catalyst used for preparing glyphosate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 Alkaline or reducing organic solvent regeneration method

[0033] Take 4 parts of deactivated activated carbon catalyst with 100g each in 4 autoclaves, and wash with 200g each of pyridine, hydrazine hydrate, N,N-dimethylformamide, and ethylenediamine. Treatment conditions: sealed in an autoclave, heated to 170°C, stirred at 500rpm for 4h, cooled to room temperature, filtered, washed with water to neutral, dried at 110°C to constant weight, and regenerated activated carbon catalyst was obtained, which was recorded as "Re-1-" 1. Re-1-2, Re-1-3, Re-1-4". The aforementioned method was used to evaluate the regeneration effects of the four regenerated catalysts, and the results are shown in Table 1.

[0034] Table 1 The regeneration effect of organic solvents on deactivated catalyst

[0035] Sample serial number

Embodiment 2

[0036] Example 2 Alkaline or reducing inorganic aqueous solution regeneration method

[0037] Take 5 parts of deactivated activated carbon catalyst with 100 g each in 5 autoclaves, and wash with 200 g each of aqueous solutions of potassium hydroxide, sodium carbonate, ammonium bicarbonate, ammonia, and ammonium sulfide (the mass fraction of each aqueous solution is 5%). The treatment conditions were the same as those in Example 1, to obtain a regenerated activated carbon catalyst, which was successively written as "Re-2-1, Re-2-2, Re-2-3, Re-2-4, Re-2-5". The aforementioned method was used to evaluate the regeneration effect of five regenerated catalysts, and the results are shown in Table 2.

[0038] Table 2 The regeneration effect of inorganic aqueous solution on deactivated catalyst

[0039] Sample serial number

Embodiment 3

[0040] Example 3 Inorganic-organic mixed solution regeneration method

[0041] Put 100g of deactivated activated carbon catalyst into the autoclave, add 100g of 5% by mass ammonium sulfide aqueous solution, and then add 100g of hydrazine hydrate; another 100g of deactivated activated carbon catalyst into the autoclave, add 100g of 5% by mass potassium hydroxide aqueous solution, Then add 100 g of N,N-dimethylformamide. The treatment conditions were the same as in Example 1, and the regenerated activated carbon catalyst was obtained, which was recorded as "Re-3-1" and "Re-3-2" in turn. The aforementioned method was used to evaluate the regeneration effects of the two regenerated catalysts, and the results are shown in Table 3.

[0042] Table 3 Regeneration effect of inorganic-organic mixed solution regeneration method

[0043]

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Abstract

The invention discloses a regeneration method of an activated carbon catalyst used for preparing glyphosate. The regeneration method comprises a solvent elution step and / or a heat treatment step, wherein the solvent elution step refers to treating inactivated activated carbon catalyst for 4-24 hours in a refluxing condition by using a water solution with alkaline or reducing inorganic substance or an organic solvent with alkalinity or reducibility; and the heat treatment step refers to high-temperature roasting to-be-treated catalyst for 0.5-24 hours in a reducing gas to obtain regenerated catalyst with activity fully recovered. An object of reuse of waste activated carbon generated in a production process of the glyphosate can be achieved by the method provided by the invention, thereby greatly reducing generation of solid waste in the production process of the glyphosate and simultaneously reducing production cost.

Description

Technical field [0001] The invention belongs to the technical field of catalysts, and relates to a regeneration method of a deactivated activated carbon catalyst, in particular to a regeneration method of an activated carbon catalyst for preparing glyphosate. Background technique [0002] Glyphosate (chemical name: N-(phosphonomethyl)glycine, English name: glyphosate) is a high-efficiency, broad-spectrum herbicide for systemic non-selective post-emergence. With the successful development and large-scale planting of glyphosate genetically modified crops, and the promotion of biofuel crops caused by the energy crisis, glyphosate has become the world's largest herbicide with the largest sales volume and the fastest growth rate. [0003] There are many synthetic routes for glyphosate, and the international mainstream route is the iminodiacetic acid method (ie IDA method), the key step of which is the catalytic oxidation of glyphosate to synthesize glyphosate. Hershman disclosed in US3...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/18B01J21/20B01J38/64B01J38/66B01J38/02C07F9/38
CPCY02P20/584
Inventor 闫海生任树杰尹荃黄瑞高双飞王军生孙鸿曼赵瑞强喻滔
Owner 中国中化股份有限公司
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