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A kind of production process and production device of dimethyl phosphite

A technology for the production process of dimethyl phosphite, which is applied in the field of production process and production equipment of dimethyl phosphite, can solve the problems of long reaction route, low yield, many side reactions, etc., so as to improve product purity and increase Product yield, the effect of reducing side reactions

Active Publication Date: 2022-04-22
SHANDONG WEIFANG RAINBOW CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this scheme realizes continuous production, the reaction route is long, and rectification and purification are required after high-temperature deacidification, with many side reactions and low yield

Method used

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  • A kind of production process and production device of dimethyl phosphite
  • A kind of production process and production device of dimethyl phosphite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0111]S1. Add methanol to the bottom of the reaction tower. The amount added is 1 / 2 of the volume of the tower kettle. The refrigerant in the condensation device at the top of the tower is cold brine at -15°C. Turn on the refrigerant circulation system, connect the condensation device to the vacuum system, and turn on the vacuum pump. Make the absolute pressure in the reaction tower be 15KPa, heat the reactor of the reaction tower, and make the inside of the reaction tower reach a state of total reflux.

[0112] S2, phosphorus trichloride and methanol are simultaneously and continuously pumped into the reaction tower with a molar ratio of 3: 1, and the flow regulator on the phosphorus trichloride feed line and the flow regulator on the methanol feed line ensure that the two raw materials are The above molar ratio enters the reaction tower accurately and stably. Wherein, the total number of trays in the reaction tower is 25, the phosphorus trichloride feed port is set at the 12...

Embodiment 2

[0118] S1. Add methanol to the bottom of the reaction tower. The amount added is 1 / 2 of the volume of the tower kettle. The refrigerant in the condensation device at the top of the tower is cold brine at -15°C. Turn on the refrigerant circulation system, connect the condensation device to the vacuum system, and turn on the vacuum pump. The absolute pressure in the reaction tower is 5KPa, and the reactor of the reaction tower is heated to make the inside of the reaction tower reach a state of total reflux.

[0119] S2, phosphorus trichloride and methanol are simultaneously and continuously pumped into the reaction tower with a molar ratio of 3: 1, and the flow regulator on the phosphorus trichloride feed line and the flow regulator on the methanol feed line ensure that the two raw materials are The above molar ratio enters the reaction tower accurately and stably. Wherein, the total number of trays in the reaction tower is 30, the phosphorus trichloride feed port is set at the ...

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Abstract

The invention provides a production device and a production process of dimethyl phosphite. In the production device or production process provided by the present invention, a condensing device is installed at the top of the reaction tower, and the condensing device is connected with the hydrogen chloride absorption system, and the esterification product is deacidified and separated while the reaction tower is carrying out the esterification reaction, realizing the The coupling of chemical reaction and product deacidification separation is completed at the same time, avoiding the high-temperature deacidification procedure of the existing process, not only shortening the process flow, but also reducing side reactions, improving yield and product purity, and reducing costs. Further, through setting the positions of the feed ports of the two raw materials in the reaction tower, it is beneficial to ensure the maximum reaction of phosphorus trichloride and improve the product yield. In addition, by separating pure dimethyl phosphite through a two-stage rectification (methanol rectification and dimethyl phosphite rectification) tower, the product purity can be improved.

Description

technical field [0001] The invention relates to the technical field of organic raw materials, in particular to a production process and a production device of dimethyl phosphite. Background technique [0002] Dimethyl phosphite, as one of the important chemical raw materials of organophosphorous products, is widely used in pesticides, textiles, rubber, food industries, etc., for example, for the synthesis of organophosphorus insecticides, herbicides and other phosphorus-containing intermediates. Among them, The glyphosate herbicide synthesized by the glycine method is prepared by the reaction of dimethyl phosphite. [0003] At present, glyphosate, as an environment-friendly broad-spectrum herbicide, has attracted more and more attention because of its high efficiency, low toxicity, broad-spectrum and no residue. Especially in recent years, with the promulgation of national environmental protection policies, the requirements for the production of fine chemicals are getting h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F9/142
CPCC07F9/142
Inventor 袁良国侯永生王亮孙国杰单志松迟志龙
Owner SHANDONG WEIFANG RAINBOW CHEM
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