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Method for recovering useful constituents in mixed waste solvent during glufosinate ammonium production process

A production process, glufosinate-ammonium technology, applied in chemical instruments and methods, organic chemistry, distillation purification/separation, etc., can solve the problems affecting the cost of glufosinate-ammonium, high energy consumption, high equipment cost and operating cost, and achieve savings Rectification column, the effect of reducing evaporation process, equipment cost and energy consumption

Inactive Publication Date: 2014-06-25
江苏威格瑞斯化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The disadvantages of three-tower series atmospheric distillation mainly lie in two aspects: one is that the three-column process is adopted, and the equipment cost and operating cost are relatively high; the other is that the separation process undergoes three evaporations, and the energy consumption is too large
This also directly affects the cost of glufosinate-ammonium production

Method used

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  • Method for recovering useful constituents in mixed waste solvent during glufosinate ammonium production process

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Experimental program
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Effect test

Embodiment 1

[0021] A method for integrated rectification recovery of tetrahydrofuran, diethyl methyl phosphite, triethyl phosphite, trimethylbenzene and other useful components in the mixed waste solvent produced in the production process of glufosinate-ammonium. The process flow is as follows figure 1 Shown, with reference to the process parameter shown in Table 1, the steps are as follows:

[0022] (1) Use the mixed waste solvent from glufosinate-ammonium production after preliminary treatment in the factory as the raw material, and pump it into the side rectification tower;

[0023] (2) Cut the distillate at 65~66°C from the top of the sideline rectification tower, control the reflux ratio, and take out the product as tetrahydrofuran from the top of the tower and enter the tetrahydrofuran storage tank;

[0024] (3) The middle side line of the side line rectification tower cuts the distillate at 120~158°C, after heat exchange by the heat exchanger, the reflux ratio is controlled, and th...

Embodiment 2

[0034] It is basically the same as in Example 1, but the overhead reflux ratio of side rectification column T-1 is controlled to be 3:1, and the overhead reflux ratio of rectification column T-2 is controlled to be 2:1.

Embodiment 3

[0036] It is basically the same as in Example 1, but the overhead reflux ratio of side rectification column T-1 is controlled to be 5:1, and the overhead reflux ratio of rectification column T-2 is controlled to be 4:1.

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Abstract

The invention discloses a method for recovering useful constituents such as tetrahydrofuran, methyl diethyl phosphate, triethyl phosphate and trimethylbenzene in a mixed waste solvent during a process of producing glufosinate ammonium by an integrated rectification process. The method comprises the following steps: using an integrated rectification process of discharging and rectifying in a single-tower side line and then connecting a single tower to rectify, directly extracting tetrahydrofuran from the top of the rectification tower in the side line and obtaining trimethylbenzene from the bottom of the tower; extracting the mixed solution of methyl diethyl phosphate and triethyl phosphate from the side line simultaneously, conveying the mixed solution to the rectification tower and carrying out single-tower separation, thereby obtaining methyl diethyl phosphate from the top of the tower and obtaining triethyl phosphate from the bottom of the tower. According to the method disclosed by the invention, the useful constituents in the mixed waste solvent during the glufosinate ammonium production process are recovered by the integrated rectification process, the total recovery rate of the mixed solvent exceeds 98%, and the quality achieves reuse standards. Compared with the conventional three-tower rectification method, the equipment cost and energy consumption of the method disclosed by the invention are obviously lowered.

Description

technical field [0001] The invention relates to a chemical separation method, in particular to a method for recovering tetrahydrofuran, diethyl methyl phosphite, triethyl phosphite, and trimethylbenzene in mixed waste solvents produced in the production process of glufosinate-ammonium by adopting an integrated rectification process. and other useful components. Background technique [0002] Glufosinate-ammonium is a new type of herbicide developed in the 1980s by Hearst Corporation (currently a subsidiary of Bayer Corporation). In addition to its herbicidal activity, it also has insecticidal and fungicidal activity and can be mixed with insecticides. , to achieve the effect of simultaneous prevention and control. The herbicide has the characteristics of high efficiency, low toxicity, environmental friendliness and easy degradation. [0003] The current common process flow for producing glufosinate-ammonium is as follows: using tetrahydrofuran as a solvent, first prepare di...

Claims

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Application Information

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IPC IPC(8): C07D307/08C07F9/142C07F9/48C07C15/02C07C7/04
CPCC07C7/04C07D307/08C07F9/142C07F9/48C07C15/02
Inventor 林军崔庆帅沈燕波李星杨广玉
Owner 江苏威格瑞斯化工有限公司
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