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A method for recovering useful components in mixed waste solvents in the production process of glufosinate-ammonium

A production process, glufosinate-ammonium technology, applied in chemical instruments and methods, organic chemistry, distillation purification/separation, etc., can solve the problems of high energy consumption, impact on glufosinate-ammonium cost, high equipment cost and operating cost, and achieve reduction Evaporation process, saving of rectification tower, effect of equipment cost and energy consumption reduction

Inactive Publication Date: 2015-11-18
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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  • A method for recovering useful components in mixed waste solvents in the production process of glufosinate-ammonium
  • A method for recovering useful components in mixed waste solvents in the production process of glufosinate-ammonium
  • A method for recovering useful components in mixed waste solvents in the production process of glufosinate-ammonium

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Experimental program
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Effect test

Embodiment 1

[0021] An integrated distillation method for recovering useful components such as 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 As shown, referring to the process parameters shown in Table 1, the steps are as follows:

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

[0023] (2) Cut the 65~66℃ fraction from the top of the sideline rectification tower, control the reflux ratio, and take the product from the top of the tower as tetrahydrofuran into the tetrahydrofuran storage tank;

[0024] (3) Cut the 120~158℃ distillate from the side line of the side line rectification tower. After the heat exchange by the heat exchanger, the reflux ratio is controlled, and the mi...

Embodiment 2

[0034] It is basically the same as embodiment 1, but the reflux ratio at the top of the sideline rectification tower T-1 is controlled to 3:1, and the reflux ratio at the top of the rectification tower T-2 is controlled to 2:1.

Embodiment 3

[0036] It is basically the same as Example 1, but the reflux ratio at the top of the sideline rectification tower T-1 is controlled at 5:1, and the reflux ratio at the top of the rectification tower T-2 is controlled at 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 a mixed waste solvent produced during the production process of glufosinate ammonium by adopting an integrated distillation process And other useful components. Background technique [0002] Glufosinate-ammonium is a new herbicide developed by Hearst Company (currently a subsidiary of Bayer) in the 1980s. In addition to its herbicidal activity, it also has insecticidal and bactericidal 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 for the production of glufosinate-ammonium is: using tetrahydrofuran as a solvent, firstly using cheap and easily available phosphor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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