Method for preparing disodium hydrogen phosphate from glyphosate mother liquor by using ECO technology

A glyphosate mother liquor, disodium hydrogen phosphate technology, applied in chemical instruments and methods, phosphorus compounds, water treatment parameter control and other directions, can solve problems such as difficulty in recycling phosphorus and salt resources

Inactive Publication Date: 2018-04-13
ANHUI DONGZHI GUANGXIN AGROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the above-mentioned technical problems, and provides a method for preparing disodium hydrogen phosphate from glyphosate m

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The invention provides a kind of method utilizing ECO method to prepare disodium hydrogen phosphate from glyphosate mother liquor, comprises the following steps:

[0020] (1) After the pH of the glyphosate mother liquor is adjusted, it enters the MVR evaporator, the temperature is controlled at 90°C in the early stage, the temperature in the final stage is controlled at 85°C, and the vacuum degree is controlled at -0.08MPa;

[0021] (2) When the volume of the glyphosate mother liquor is concentrated to 30% of the original volume, all the materials are transferred to a crystallization kettle for normal pressure crystallization, and the crystallization temperature is controlled to be 0° C. for 1 h;

[0022] (3) Carry out solid-liquid separation after material crystallization, isolate crude sodium chloride, use as industrial salt after being purified by salt washing equipment;

[0023] (4) After mixing the liquid material in step 3 and the evaporated raffinate in step 1, t...

Embodiment 2

[0027] The invention provides a kind of method utilizing ECO method to prepare disodium hydrogen phosphate from glyphosate mother liquor, comprises the following steps:

[0028] (1) After the pH of the glyphosate mother liquor is adjusted, it enters the MVR evaporator, the temperature is controlled at 95°C in the early stage, the temperature in the final stage is controlled at 90°C, and the vacuum degree is controlled at -0.08MPa;

[0029] (2) When the volume of the glyphosate mother liquor is concentrated to 35% of the original volume, all the materials are transferred to a crystallization kettle for normal pressure crystallization, and the crystallization temperature is controlled to be 5° C. for 2 hours;

[0030] (3) Carry out solid-liquid separation after material crystallization, isolate crude sodium chloride, use as industrial salt after being purified by salt washing equipment;

[0031] (4) After mixing the liquid material in step 3 and the evaporated raffinate in step ...

Embodiment 3

[0035] The invention provides a kind of method utilizing ECO method to prepare disodium hydrogen phosphate from glyphosate mother liquor, comprises the following steps:

[0036] (1) After the pH of the glyphosate mother liquor is adjusted, it enters the MVR evaporator, the temperature is controlled at 100°C in the early stage, the temperature in the final stage is controlled at 95°C, and the vacuum degree is controlled at -0.08MPa;

[0037] (2) When the volume of the glyphosate mother liquor is concentrated to 40% of the original volume, all the materials are transferred to the crystallization kettle for normal pressure crystallization, and the crystallization temperature is controlled to be 10° C. for 3 hours;

[0038] (3) Carry out solid-liquid separation after material crystallization, isolate crude sodium chloride, use as industrial salt after being purified by salt washing equipment;

[0039] (4) After mixing the liquid material in step 3 and the evaporated raffinate in s...

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Abstract

The invention discloses a method for preparing disodium hydrogen phosphate from a glyphosate mother liquor by using an ECO technology, and belongs to the field of chemical engineering production. Themethod comprises the following steps: (1) adjusting the pH value of the glyphosate mother liquor, and adding the adjusted mother liquor into an MVR evaporator; (2) completely transferring the obtainedmaterial into a crystallization kettle, and carrying out normal pressure crystallization; (3) carrying out solid-liquid separation after the material is crystallized; (4) carrying out normal pressuredegradation in a catalytic degradation tower; (5) carrying out heat exchange on the degraded wastewater to cool the wastewater to room temperature, transferring the cooled wastewater into an extraction tank, carrying out cooling and crystallization, pumping the obtained crystallized extract into a two-in-one filter press, and filtering the crystallized extract; and (6) washing the filtered solidwith water two times, discharging the washed solid, and packaging the solid for sale. The MVR evaporator is used to carry out concentration, so the purity of the product is ensured; and the electrocatalytic oxidation technology is used to catalytically degrade the glyphosate wastewater, so the disodium hydrogen phosphate can be obtained, the phosphorus resource and the salt resource can be recovered, and the cost is saved.

Description

technical field [0001] The invention belongs to the field of chemical production, in particular to a method for preparing disodium hydrogen phosphate from glyphosate mother liquor by using an ECO method. Background technique [0002] Glyphosate is a high-efficiency, low-toxicity, low-residue, and broad-spectrum herbicide for post-emergent herbicides. It has good systemic and conductive properties. It is one of the herbicide varieties with the largest consumption, the fastest growth momentum and the most market competitiveness in the world today. But at the same time, the production of glyphosate is also accompanied by the production of a large amount of wastewater. The pollution problem of glyphosate production is mainly manifested as wastewater, which has large discharge, high pollutant concentration, high toxicity, high salt content, and refractory compounds. High content, difficult management and other characteristics. At present, the application of pollutant treatment ...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01B25/30C01D3/04C02F103/36C02F101/30
CPCC01B25/30C01D3/04C02F1/001C02F1/041C02F1/26C02F1/44C02F1/46109C02F1/46114C02F1/4672C02F1/66C02F1/725C02F9/00C02F2101/306C02F2103/36C02F2209/02C02F2301/063
Inventor 黄中桂蔡小林付承祥袁晓林付志平史正光朱凯明金斐吕礼轮刘云飞王彪
Owner ANHUI DONGZHI GUANGXIN AGROCHEMICAL CO LTD
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