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Method for processing PMIDA synthesis mother liquor

A technology for synthesizing mother liquor and treatment methods, applied in chemical instruments and methods, neutralized water/sewage treatment, multi-stage water/sewage treatment, etc. The effect of simple process and cost reduction

Active Publication Date: 2012-03-21
ANHUI COSTAR BIOCHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above two patents use relatively advanced membrane technology, the two-step membrane technology needs to treat a large amount of wastewater, and the total amount of wastewater disposal is very large, which puts forward very high requirements on the wastewater load of the membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1t of diglyphosate mother liquor (containing 0.7% formaldehyde, 1.0% bisglyphosate, 1.2% formic acid) produced by the IDA route as a raw material is added with alkali (the addition of NaOH solution with a mass percentage concentration of 0.1mol / l ) to adjust the pH to 6 and then enter the reverse osmosis membrane device (the reverse osmosis membrane is a polyamide composite membrane, and the manufacturer is the HPA-FR-4040 series membrane element of Hyde Energy Company), at an operating pressure of 6.0MPa and a temperature of 20°C Reverse osmosis treatment under conditions to obtain 0.7t of fresh water and 0.3t of concentrated solution, the concentrated solution enters the pervaporation membrane device (pervaporation membrane is a high-silica ZSM-5 zeolite filled silicone rubber membrane), at a temperature of 70 ° C, the permeation side Pressure is 8×10 3 Under the condition of Pa, the formaldehyde concentrated solution with a mass percent concentration of 36.7% and the...

Embodiment 2

[0019] 1 t of diglyphosate mother liquor (containing 0.7% formaldehyde, 1.0% bisglyphosate, 1.2% formic acid) produced by the IDA route as a raw material enters the reverse osmosis membrane device ( The reverse osmosis membrane is a polyamide composite membrane, which is the HPA-FR-4040 series membrane element of Haideneng Company), and is processed under the conditions of operating pressure of 7.0MP and temperature of 30°C to obtain 0.72t of fresh water and 0.28t of concentrated liquid. The concentrated liquid enters the pervaporation membrane device (the pervaporation membrane is a high-silica ZSM-5 zeolite filled silicone rubber membrane), at a temperature of 80 °C, the permeate side pressure is 7×10 3 Under the condition of Pa, the formaldehyde concentrated solution with a mass percent concentration of 37.8% and the diglyphosate concentrated solution with a mass percent concentration of 9.2% are obtained through recovery by pervaporation.

[0020] The present invention ado...

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PUM

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Abstract

The invention discloses a method for processing PMIDA synthesis mother liquor by adopting a combination membrane technique. The method aims at acidic mother liquor generated in the technique for preparing PMIDA by taking iminodiacetonitrile as the raw material and adopting IDA route, alkali is used for adjusting the pH value of the mother liquor to be 6-11, a reverse osmosis membrane is used for concentrating to obtain a concentrated liquor, and the concentrated liquor is subject to pervaporation and recovery to obtain formaldehyde. Concentrated liquor of PMIDA with mass percentage concentration being over 9% can be obtained by adopting the inventive method, the concentrated liquor of PMIDA can be directly prepared into aqueous solution agent to be sold or taken as raw material for producing pesticide glyphosate, and at the same time, the invention has lower energy consumption and no pollution to the environment in the operation process.

Description

technical field [0001] The present invention relates to the separation process of membrane combination, in particular to a treatment method of diglyphosate synthesis mother liquor, that is, after using iminodiacetonitrile to produce diglyphosate, diglyphosate and formaldehyde in the diglyphosate mother liquor are separated according to their properties and The invention relates to separation and recovery, and belongs to the technical field of liquid-liquid separation. Background technique [0002] Glyphosate is a systemic conduction type broad-spectrum herbicide, which mainly inhibits enolpyruvyl shikimelin phosphate synthase in the body, thereby inhibiting the conversion of shikime to phenylalanine, tyrosine and tryptophan. The transformation of the protein will interfere with the synthesis of the protein and cause the death of the plant, and will have no adverse effects on the seeds and soil microorganisms hidden in the soil. Diglyphosate is an important intermediate in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F9/38C07C47/058C07C45/78C02F9/04C02F1/44C02F1/66
Inventor 薛谊吕爽李健葛九敢孔国平
Owner ANHUI COSTAR BIOCHEM CO LTD
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