Process for separation and purification of glyphosate from glyphosate solution by membrane technology

A technology of glyphosate mother liquor and medium glyphosate, which is applied in the field of separation and concentration of glyphosate mother liquor, can solve the problems of low recovery rate of glyphosate, easy decomposition of glyphosate, and reduction of effective content, and achieve reduction Energy consumption, low operating cost, and the effect of improving product quality and yield

Inactive Publication Date: 2006-09-06
捷马化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Glyphosate mother liquor needs to continue to be concentrated and utilized. The general method is to use steam heating to evaporate and concentrate. The disadvantage is that glyphosate is easy t

Method used

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  • Process for separation and purification of glyphosate from glyphosate solution by membrane technology
  • Process for separation and purification of glyphosate from glyphosate solution by membrane technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The mother liquor containing 3.8% glyphosate acid enters the filter press to separate the solid glyphosate raw powder, the mother liquor enters the multimedia filter containing active carbon to remove the viscous liquid in the mother liquor, and then uses a micro filter with a pore size of 1-10 μm The pore filter membrane directly removes submicron, micron particles and flocculent precipitates in the mother liquor, and the ultrafiltration membrane removes soluble macromolecular impurities.

[0018] The mother liquor after the above treatment is pumped into the primary nanofiltration membrane for separation. After the concentrated solution reaches the standard (glyphosate acid mass fraction ≥ 10%), it is collected in the storage tank. If the concentrated solution does not reach the standard, continue to circulate until it reaches the standard. The permeate enters the second-stage nanofiltration membrane for separation, and the second-stage nanofiltration concentrate retur...

Embodiment 2

[0021] The mother liquor containing 3.6% ammonium glyphosate enters the filter press for pressure filtration, then enters the multimedia filter containing activated carbon to remove the viscous liquid in the solution, and then directly removes the viscous liquid in the solution with a microporous filter membrane with a pore size of 1-10 μm. The submicron, micron particles and flocculent precipitates are removed by ultrafiltration membranes to remove soluble macromolecular impurities.

[0022] The mother liquor after the above treatment is pumped into the primary nanofiltration membrane for separation. After the concentrated solution reaches the standard (ammonium glyphosate mass fraction ≥ 10%), it is collected in the storage tank. If the concentrated solution does not reach the standard, continue to circulate until it reaches the standard. The filtrate permeate enters the second-stage nanofiltration membrane for separation, and the second-stage nanofiltration concentrate retur...

Embodiment 3

[0025] The mother liquor containing 1.8% sodium glyphosate enters the filter press for pressure filtration, and then enters the multi-media filter containing activated carbon to remove the viscous liquid in the mother liquor, and then directly removes the viscous liquid in the mother liquor with a microporous filter membrane with a pore size of 1-10 μm. The submicron, micron particles and flocculent precipitates are removed by ultrafiltration membranes to remove soluble macromolecular impurities.

[0026] The mother liquor after the above treatment is pumped into the primary nanofiltration membrane for separation. After the concentrated solution reaches the standard (sodium glyphosate mass fraction ≥ 10%), it is collected in the storage tank. If the concentrated solution does not reach the standard, continue to circulate until it reaches the standard; The filtrate enters the secondary nanofiltration membrane for separation, the secondary nanofiltration concentrate returns to th...

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PUM

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Abstract

The invention discloses a method for extracting glyphosate from heavy glyphosate stock solution by membrane separation technique. It consists of filtering the mother liquid, removing the solid component of the system, then according to the molecular structure, molecular mass, particle size and electric charge, from the big one to the small one, separating step by step by selecting appropriate hyperfiltration membrane, nanofiltration membrane and reverse osmosis membrane to obtain the effective composition of glyphosate. The invention unitizes the separation, concentration and the purification, and is performed at normal temperature. The barrier separation process is excellent in that it is of no change of phase, avoids the decomposition of glyphosate caused by high enrichment and concentration, effectively improves the product quality and yield rate, greatly reduces the energy consumption, is of consecutive operation, low operation cost, and it is energy-saving, highly effective, environment-friendly, furthermore, it can be operated by combining with routine thickening operating unit or be operated individually and is suitable for industrial continuous production.

Description

technical field [0001] The invention relates to the separation and concentration of glyphosate mother liquor, in particular to a membrane technology separation and concentration method for glyphosate and water. Background technique [0002] Glyphosate is a broad-spectrum and efficient herbicide, and there are two mainstream synthetic methods: (1) The method for synthesizing glyphosate by IDA method is: diglyphosate is oxidized into glyphosate solution in the aqueous phase, After crystallization and solid-liquid separation, solid glyphosate is obtained, and the mother liquor still contains 1-4% dissolved glyphosate, as well as trace amounts of glyphosate, formaldehyde, formic acid and unreacted diglyphosate, etc. The chemical reaction equation is as follows: [0003] <chemistry num="001"> <chem file="200610050243_cml001.xml" / > < / chemistry> [0004] (2) The method for synthesizing glyphosate by glycine method is to take glycine, dialkyl phosphite, paraf...

Claims

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Application Information

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IPC IPC(8): C07F9/38B01D61/02B01D61/14B01D61/38B01D69/00A01N57/20
CPCY02P20/10
Inventor 周良王文徐国明郑端镛邱晖刘小华王中石吴冬莲徐瑶
Owner 捷马化工股份有限公司
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