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Wastewater treatment technique for PMIDA preparation process

A wastewater treatment and preparation process technology, applied in the direction of neutralization water/sewage treatment, adsorption water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problem that diglyphosate has not been recycled, and achieve the effect of value improvement

Active Publication Date: 2007-09-26
HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention patent with application number 01807900.8 and publication number CN1422275A mentions a method for recovering sodium chloride in the wastewater, but the high-value diglyphosate has not been recycled

Method used

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  • Wastewater treatment technique for PMIDA preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 10,000kg of mother liquor produced during the preparation of diglyphosate into the reactor, adjust the pH to 2.0 with sodium hydroxide, and filter the adjusted pH of the mother liquor of bisglyphosate through a filter press, bag filter or precision filter Pump into the raw material liquid tank, the bisglyphosate mother liquid in the raw material liquid tank uses a pump with a lift of 20m to pump the raw material liquid into a multimedia filter containing activated carbon to remove the viscous liquid in the mother liquid, and then passes through a microporous filter membrane with a pore size of 50 μm The micron particles in the mother liquor are directly removed, and then divided into two streams after being separated by an ultrafiltration membrane. The concentrated side liquid returns to the raw material liquid tank, and the light side liquid enters the secondary membrane system after being pressurized by a high-pressure pump. Diglyphosate mother liquor solution ente...

Embodiment 2

[0025] The liquid 1000kg in No. 1 liquid storage tank among the embodiment 1 is joined in the autoclave, start stirring, then add 1500kg deionized water, 300kg mass fraction successively and be 90% bisglyphosate, 10kg gac catalyst, be warming up to 60 ℃, feed oxygen, control reaction temperature 62±2℃, reaction pressure 0.6Mpa, react for 2 hours, remove catalyst by filtration, cool and crystallize filtrate, obtain 190kg of glyphosate with a mass fraction of 96% after drying crystals obtained by filtration, filtrate 2600kg is concentrated to make 200kg of 10% glyphosate aqueous solution. The yield of glyphosate is 99.75% based on the solid input of diglyphosate.

Embodiment 3

[0027] Add 10,000kg of mother liquor produced during the preparation of bisglyphosate into the reaction kettle, adjust the pH to 7.0 with sodium hydroxide, pump it into the raw material liquid tank after pressure filtration, and pump the raw material liquid into the multi The medium filter is filtered by a microporous membrane with a pore size of 20 μm and then enters the ultrafiltration. The concentrated side liquid returns to the raw material liquid tank, and the light side liquid enters the secondary membrane system after being pressurized by a high-pressure pump. Diglyphosate mother liquor solution entering the secondary membrane system is divided into two strands after membrane separation, and the solution rich in diglyphosate on the thick side is returned to the front-end inlet. When the concentration of diglyphosate in the solution reaches 20%, the concentrate Into the No. 1 liquid storage tank, a total of 1000kg, the light side solution is pressurized by a high-pressure...

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Abstract

The invention discloses a waste water disposing craft of double gly phosphine preparing course, which comprises the following steps: removing double gly phosphine crystal through filtering; leading filter liquor into preconditioning system; reaching feed water demand of super-filtering device; choosing probable hyperfiltration membrane, sodium filter membrane and reverse osmosis membrane based on molecular structure, molecular mass, size of particle and charge nature of double gly phosphine needed separation and extract dense from big to small; proceeding step-by-step segregation till extracting dense active ingredient double gly phosphine; separating to common salt solution through film disposal without other foreign matter; using alkali-chloride industry as saline water or getting common salt solid through concentrated dehydration water.

Description

technical field [0001] The invention relates to a waste water treatment process, mainly a waste water treatment process in the preparation process of diglyphosate. Background technique [0002] N-phosphonomethyl diacetic acid (abbreviated as bisglyphosate) is an intermediate for the preparation of glyphosate by the IDA method, and its formula is: [0003] [0004] The existing technology of preparing glyphosate intermediate diglyphosate mainly contains two: one is the diethanolamine method, prepares iminodiacetic acid disodium salt by diethanolamine, catalyst catalytic dehydrogenation in sodium hydroxide solution, and then After adding hydrochloric acid to return to acid, react with phosphorous acid and formaldehyde under acidic conditions to produce diglyphosate, then neutralize with sodium hydroxide to PH=0.5-1.5 to precipitate diglyphosate, separate the mother liquor to obtain solid diglyphosate, and use the mother liquor as waste water deal with. The second is to pr...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F1/44C02F1/74C02F1/66C02F1/28
Inventor 丁国良赵经纬刘和德陈健夏金维
Owner HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH
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