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Recovery method and device for glyphosate raw material methanol

A recovery device and glyphosate technology, applied in chemical instruments and methods, preparation of organic compounds, separation/purification of hydroxyl compounds, etc., can solve problems such as low methanol content, high pressure, and impact on methanol content, and achieve improved content and increase the condensation area, the effect of a simple method

Active Publication Date: 2015-03-25
HUBEI TAISHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vent pipe of the whole system is condensed through a 0°C brine condenser, and the condensate flows into the methanol storage tank, so that the condensed methylal will penetrate into the methanol, and the gaseous methylal can also volatilize into the finished product Methanol storage tank (the boiling point of methylal is much lower than that of methanol), which seriously affects the content of methanol; at the same time, as the outside temperature gets hotter, the condensation effect of the condenser is not good, and the pressure of the whole system will increase. The larger the size, the more the material will be ejected through the vent pipe of the condenser, and the safety and environmental protection accidents will increase.
Methanol content is low or unqualified, seriously affecting the yield of glyphosate

Method used

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  • Recovery method and device for glyphosate raw material methanol
  • Recovery method and device for glyphosate raw material methanol

Examples

Experimental program
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Effect test

Embodiment 1

[0013] The mixed gas of methanol and methylal evaporated in the dealcoholization process of the glyphosate dealcoholization kettle undergoes three-stage condensation, and after the methanol and methylal are liquefied, they are collected into the dilute methanol storage tank and recovered in the methanol rectification post. The dilute methanol storage tank and the vent pipe of the reflux methylal are combined and passed into the -10°C refrigerated brine condenser, and the condensate flows into the methylal return tank; the finished methanol storage tank and the vent pipe of the methanol return tank are combined and then passed through into the 2°C brine condenser, and the condensate flows into the methanol return tank, which increases the heat transfer area and condensation effect of the condenser. Using this technology, the methanol content increases by 0.4%, the recovery rate of methylal increases by 12kg / t, and glyphosate The yield increased by 0.43%.

Embodiment 2

[0015] The mixed gas of methanol and methylal evaporated in the dealcoholization process of the glyphosate dealcoholization kettle undergoes three-stage condensation, and after the methanol and methylal are liquefied, they are collected into the dilute methanol storage tank and recovered in the methanol rectification post. The dilute methanol storage tank and the vent pipe of returning methylal are combined and then passed into the -15°C frozen brine condenser, and the condensate flows into the methylal return tank; the finished methanol storage tank and the vent pipe of the methanol return tank are combined and then passed through into the 0°C brine condenser, the condensate flows into the methanol reflux tank, which increases the heat transfer area and condensation effect of the condenser. Using this technology, the methanol content increases by 0.52%, the recovery rate of methylal increases by 15kg / t, and glyphosate The yield increased by 0.77%.

Embodiment 3

[0017] The mixed gas of methanol and methylal evaporated in the dealcoholization process of the glyphosate dealcoholization kettle undergoes three-stage condensation, and after the methanol and methylal are liquefied, they are collected into the dilute methanol storage tank and recovered in the methanol rectification post. The dilute methanol storage tank and the vent pipe of returning methylal are combined and passed into the -18°C frozen brine condenser, and the condensate flows into the methylal return tank; the finished methanol storage tank and the vent pipe of the methanol return tank are combined and then passed through into the 3°C brine condenser, and the condensate flows into the methanol reflux tank, which increases the heat transfer area and condensation effect of the condenser. Using this technology, the methanol content increases by 0.34%, and the recovery rate of methylal increases by 11.7kg / t. The phosphine yield increased by 0.61%.

[0018] Glyphosate raw mate...

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Abstract

The invention relates to a recovery method and a device for glyphosate raw material methanol, and in particular relates to a recovery method of dividing and condensing diluted methanol, formaldehyde and product formaldehyde. The method comprises the following steps: introducing a diluted methanol storage tank and an emptying tube for refluxing dimethoxymethane combined to a condenser containing frozen saline at -10--18 DEG C, wherein condensate flows into a dimethoxymethane reflux tank; combining the product methanol storage tank and the emptying tube of the methanol refluxing tank and flowing through a condenser containing saline at 3--3 DEG C, wherein condensate flows into the methanol refluxing tank. According to the invention, the yield of glyphosate raw material is improved over 0.3%, the recovery rate of dimethoxymethane is improved by over 10kg / t, and the content of methanol is improved by 0.3-0.8%. The invention realizes energy conversation and consumption reduction as well as clean production.

Description

technical field [0001] The invention relates to a method and device for recovering glyphosate raw materials, in particular to a method for recovering dilute methanol, formal, and finished methanol through diversion and condensation. Background technique [0002] With the news that Monsanto Company of the United States announced that the shutdown device will resume production and add new devices, domestic small companies are busy selling at low prices, and their prices have also fallen all the way. After the impact and reshuffle of the industry's capacity release in the short term, the industry's development and profitability have returned to rationality. Therefore, only by improving product yield, independent innovation, reducing costs, and narrowing the gap in production technology with foreign companies can companies be extremely competitive at any time. At present, the recovery of dilute methanol in the glyphosate industry mainly uses tray distillation, and the distillat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/04C07C29/74C07C43/303C07C41/58
Inventor 王瑞宝
Owner HUBEI TAISHENG CHEM
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