Method for utilizing thermal energy during continuous synthesis of glyphosate

A glyphosate and thermal energy technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of hydroxyl compounds, etc., can solve the problems of low level of energy utilization, few researches on rational utilization of unstorable energy, etc., and reduce social energy. Shortage problem, saving effect of solvent recovery and consumption of steam

Active Publication Date: 2008-07-23
ZHEJIANG XINAN CHEM INDAL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In short, in the current production of glyphosate, the recycling of by-products has been paid more and more attention by manufacturers, and a relatively co

Method used

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  • Method for utilizing thermal energy during continuous synthesis of glyphosate
  • Method for utilizing thermal energy during continuous synthesis of glyphosate
  • Method for utilizing thermal energy during continuous synthesis of glyphosate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]The mixed steam produced in the hydrolysis process is preheated to 103°C and then pressurized to 0.025MPa by the air compressor, and enters the tower from the middle and lower part of the tower. Sodium hydroxide methanol solution is fed from the top of the tower as the reflux liquid, the reflux ratio is controlled at 1:3, countercurrent contact, neutralization, the pH of the overhead distillate is adjusted at 6.5 to 7.0, and the pH of the tower still water is at 9 to 10. The overhead distillate is preheated and sent to the lower rectification tower to separate methylal and methanol, and the obtained methanol product content: ≥99%; methylal product content: ≥85%.

Embodiment 2

[0042] The mixed steam generated in the hydrolysis process is washed by the thermal insulation spray alkali washing tower, the gas from the top of the washing tower is preheated and pressurized by the air compressor into the dehydration tower, and the washing liquid enters the dehydration tower kettle, and the reflux ratio is controlled at 1:4 , The gas containing methylal and methanol is distilled from the top of the tower, and after preheating, it is sent to the lower rectification tower to separate methylal and methanol. The obtained methanol product content: ≥99%; the methylal product content: ≥85%.

Embodiment 3

[0044] The mixed steam produced in the hydrolysis process is preheated to 103°C and then pressurized to 0.025MPa by the air compressor, and enters the tower from the middle and lower part of the tower, and the methanol solution of sodium hydroxide is fed from the top of the tower, and the reflux ratio is controlled to 1 : 3, countercurrent contact, neutralization, adjust the pH of the overhead distillate at 6.5 to 7.0, the pH of the tower still water at 9 to 10, and the tower overhead is sent to the lower rectifying tower through preheating to separate formaldehyde Aldehyde and methanol, the obtained methanol product content: ≥99%; methylal product content: ≥85%.

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Abstract

The invention provides a reasonable utilization method for heat energy in the synthesis of glyphosate. The process is as follows: adding the steady saturated steam into the tower after preheating for the neutralization inside the tower or gas phase neutralization outside the tower. After the dehydration, the top of the tower steams out the vapor to overheating state after re-preheating, then sent into the second rectifying tower for separation, gaining qualified methylal and methyl alcohol products.

Description

technical field [0001] The invention relates to the research field of rational utilization of heat energy in glyphosate continuous synthesis. Background technique [0002] Glyphosate is a low-toxicity, high-efficiency, broad-spectrum herbicide. It was first successfully developed by Monsanto Company of the United States in 1974 and has applied for patent protection in many countries around the world. In the mid-to-late 1990s, with the successive expiration of its patent protection in various countries in the world and the widespread planting of glyphosate-resistant transgenic crops, the application of glyphosate has developed rapidly, becoming the largest and fastest-growing pesticide variety. [0003] There are many synthetic methods of glyphosate, but currently only two industrialized process routes are used, namely the IDA process and the alkyl ester process. The alkyl ester process is the process route adopted by most of the production enterprises in our country. Alkyl...

Claims

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Application Information

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IPC IPC(8): C07C47/198C07C41/58C07C29/80C07C31/04C07F9/38
Inventor 王伟陈晓祥周曙光任不凡詹波黄婕吴涛王林辉金浩李丽娟佘慧玲汤军伟余友成黄建军邵振威
Owner ZHEJIANG XINAN CHEM INDAL GROUP
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