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Method for recycling glyphosine from mother solution for preparing glyphosine

A technology of bisglyphosate mother and bisglyphosate, which is applied in the field of recycling bisglyphosate, can solve the problems of wasting useful resources and increasing the difficulty of wastewater treatment, and achieve the effect of reducing resource waste, reducing difficulty and cost, and achieving economic benefits

Inactive Publication Date: 2008-12-03
NANJING UNIV
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AI Technical Summary

Problems solved by technology

Diglyphosate is not recycled, which wastes useful resources and increases the difficulty of wastewater treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Get the mother liquor 500ml of producing diglyphosate, its concentration of diglyphosate is 1.45%, through precision filtration, and adjust pH=1.5, obtain the clarification mother liquor of diglyphosate; The 335-type weakly basic anion exchange resin produced by the company is an example. The 335-type resin is an epoxy-based skeleton) 10ml is packed into a column, and after being treated with dilute sulfuric acid and dilute sodium hydroxide solution to form an OH type, the above-mentioned bisglyphosate is clarified. The mother liquor is put on the column for adsorption, the adsorption temperature is 5°C, the flow rate is 2BV / h, the concentration of diglyphosate in the adsorbed water is 638mg / L, and the recovery rate is 95.6%. After the adsorption is saturated, 8% sodium hydroxide solution is used for desorption at a temperature of 50° C. and a flow rate of 1 BV / h to obtain a sodium salt solution of diglyphosate. The concentration of diglyphosate is 23.0%, and the desorpt...

Embodiment 2

[0014] Get the mother liquor 200ml of producing diglyphosate, the concentration of its diglyphosate is 1.45%, through precision filtration, and regulate pH=1.5, obtain the clarification mother liquor of diglyphosate; The produced 717 type anion exchange resin is an example) 10ml packing column, after being processed into OH form with dilute sulfuric acid, dilute sodium hydroxide solution successively, above-mentioned bisglyphosate clarification mother liquor is upper column adsorption, and adsorption temperature is 30 ℃, and flow velocity is 12BV / h, the concentration of bisglyphosate in the adsorbed water is 1682mg / L, and the recovery rate is 88.4%. After saturated adsorption, use 3% sodium hydroxide solution to desorb at a temperature of 25° C. and a flow rate of 4 BV / h to obtain a bis-glyphosate sodium salt solution. The concentration of bis-glyphosate is 8.4%, and the desorption rate is 98.1%. Diglyphosate sodium salt solution was added with hydrochloric acid to adjust the ...

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Abstract

A method for recovering N-(Phosphonomethyl) iminodiacetic acid from the mother liquid thereof comprises the steps as follows: fine-filtering the mother liquid to obtain a clear mother liquid; adsorbing at a flow rate of 2-12BV / h in an anion exchange resin adsorption column at 5-30 DEG C and subjecting the discharge water to the waste water treatment; desorbing with 3-8% sodium hydroxide solution as the desorption solution at a flow rate of 1-4BV / h at 25-50 DEG C to obtain a sodium salt solution of N-(Phosphonomethyl) iminodiacetic acid; and subjecting to acidization to obtain N-(Phosphonomethyl) iminodiacetic acid. The method carries out the recovery of N-(Phosphonomethyl) iminodiacetic acid from the mother liquid thereof before the waste water treatment, thereby reducing the resource consumption and improving the economic benefit on one hand, and reducing the difficulty and the cost of the waste water treatment on the other hand.

Description

technical field [0001] The invention relates to a production method of diglyphosate, in particular to a method for recovering diglyphosate from a mother liquor for producing diglyphosate. Background technique [0002] Diglyphosate (N-(phosphonic acid methyl) iminodiacetic acid) production mother liquor, in addition to containing about 1.5% of diglyphosate, also contains relatively high concentrations of hydrochloric acid, iminodiacetic acid, etc., currently produced Diglyphosate mother liquor is directly treated as waste water. Diglyphosate has not been recycled, which wastes useful resources and increases the difficulty of wastewater treatment. Contents of the invention [0003] The present invention adopts the method that resin reclaims diglyphosate, specifically refers to a kind of adopting anion exchange resin to absorb diglyphosate under the condition of PH1-5, 5-40 DEG C, flow velocity 2-12BV / h, then use dilute lye (with Sodium hydroxide solution is representative)...

Claims

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Application Information

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IPC IPC(8): C07F9/38
Inventor 赵玉明朱立
Owner NANJING UNIV
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