Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of triethyl phosphite

A technology of triethyl phosphite and triethylamine, which is applied in chemical instruments and methods, compounds of Group 5/15 elements of the periodic table, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problem of high cost. , unfavorable environmental protection and other problems, to achieve the effect of complete reaction, reducing waste water treatment costs, and reducing the content of inorganic salts

Pending Publication Date: 2020-12-04
太仓康源化建医药有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the wastewater generated after the preparation usually contains a large amount of inorganic salts, which is costly to treat and is not conducive to environmental protection.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of triethyl phosphite
  • Preparation method of triethyl phosphite
  • Preparation method of triethyl phosphite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A preparation method of triethyl phosphite, comprising the following steps:

[0044] S1: Accurately weigh 1 mol of phosphorus trichloride, 4 mol of ethanol, 3 mol of triethylamine, 2 mol of trioctylamine, 2 mol of n-hexane and 1 mol of sodium carbonate;

[0045] S2: Add absolute ethanol, n-hexane, triethylamine and trioctylamine into the reaction kettle, start stirring, and obtain a mixed solution after the solution is evenly mixed;

[0046] S3: Use an ice machine to cool down the mixed solution to keep the temperature of the system at 5°C. After cooling down, add phosphorus trichloride dropwise to the reaction solution. The dropwise addition is completed in 1.3 hours, and the temperature is kept for 2 hours to make the reaction solution completely react;

[0047] S4: The temperature of the reaction solution obtained in step S3 was raised to 26° C., and purified water was added to mix evenly, and the mixture was allowed to stand to separate into layers, and the oil phas...

Embodiment 2-6

[0049] Examples 2-6 relate to a preparation method of triethyl phosphite, based on Example 1, the only difference is that the selected molar amounts of raw materials and process parameters are different, see Table 2 for details.

[0050] Table 2 Example 2-6

[0051]

Embodiment 7

[0053] Example 7 relates to a preparation method of triethyl phosphite. Taking Example 4 as an example, only the temperature of the reaction system in step 2 is changed to 0° C., and the holding time is 1 hour.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the field of production of organic chemical intermediates, and particularly discloses a preparation method of triethyl phosphite. The preparation method comprises the steps ofuniformly mixing absolute ethyl alcohol, an organic solvent, a catalyst trioctylamine and an acid-binding agent to obtain a mixed solution; cooling the mixed solution, keeping the temperature of thesystem at 0-10 DEG C, dropwise adding a phosphorus trichloride solution into the mixed solution with the molar ratio of phosphorus trichloride to absolute ethyl alcohol being 1:(3-6), continuously conducting heat preservation for 1-4h after adding is completed, and obtaining a reaction solution; and separating and purifying to obtain triethyl phosphite, wherein the molar ratio of trioctylamine tothe acid-binding agent is 2:(3-5). The preparation method has the advantages that under the condition that the product yield is not lower than 90% and the purity is not lower than 95%, the content ofammonium chloride in the reaction waste liquid is reduced, and the waste liquid treatment cost is reduced.

Description

technical field [0001] This application relates to the field of organic chemical intermediate production, more specifically, it relates to a kind of preparation method of triethyl phosphite. Background technique [0002] Triethyl phosphite is an important organic chemical intermediate. It is used in the production of organophosphorus pesticides such as fencarb in pesticides; it is used in the production of fluorescent whitening agents in dyes; it is used in the production of analgesics and anti-infection in medicine It is used in the plastics industry to prepare plasticizers and stabilizers; it can also be used in dyes and gasoline additives, so it is a fine organic chemical with a wide range of uses. At present, the annual domestic demand for triethyl phosphite is about 8,000-10,000 tons. With the expansion of its application range, the market demand will continue to grow. [0003] The current production method of triethyl phosphite in the related art mainly adopts phospho...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/142B01J31/02
CPCB01J31/0237C07F9/142
Inventor 马明华马兴元王屹皓王霖龙
Owner 太仓康源化建医药有限公司