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

Preparation method for 2,6-dimethyl pyridine

A technology of lutidine and xylene, applied in the field of chemistry, can solve the problems of low reaction yield and low initial temperature, and achieve the effects of improving yield and optimizing reaction conditions

Active Publication Date: 2014-09-24
上海鼎素精细化工有限公司
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is that the initial reaction temperature in the prior art scheme is too low, which cannot make urea and 2,6-lutidine react well, and because it is a two-phase reaction, the yield of the reaction is not high ,And other issues

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The present invention is a method for preparing 2,6-lutidine applied in the field of chemistry, which is a major improvement made on the basis of the shortcomings of existing methods for preparing 2,6-lutidine, and has very important Practical significance.

[0027] 1. Selection of raw materials

[0028] The raw material of 2,6-lutidine is preferably 2,6-lutidine that has been simply distilled, and the fraction of the crude pyridine raw material at 140-145 degrees Celsius can be used as the reaction raw material, and the concentration of the raw material is about 30.

[0029] 2. Selection of reaction conditions

[0030] In the original method, the initial temperature is too low, and the urea and raw materials cannot be well mixed. Therefore, before adding urea, the temperature of the raw material in the reactor is raised to 85 degrees centigrade and water of 5% to 10% of the raw material mass is added to the raw material, and then urea is added thereto. The substance...

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 discloses a preparation method for 2,6-dimethyl pyridine. The method comprises the following steps of: adding raw materials of 2,6-dimethyl pyridine and water into a reactor in sequence, heating, adding urea, and forming a melting state for undergoing a reaction; finishing the reaction, cooling the materials in the reactor to the normal temperature, pouring the materials out, and filtering a complex compound out; and washing the complex compound with toluene or dimethylbenzene, washing, and decomposing the complex compound. The method has the advantages: the complex reaction temperature is corrected, and the reaction is performed more completely by adding a small amount of water; and through two-phase azeotropic decomposition, the aim of recycling the reacted urea is fulfilled, and the production of a large amount of waste water is reduced.

Description

technical field [0001] The invention relates to a method for preparing chemical products in the field of chemistry, in particular to a method for preparing 2,6-lutidine refined by recrystallization. Background technique [0002] As we all know, the key problem of refining 2,6-lutidine by urea complexation is to strengthen the complexation effect of urea and 2,6-lutidine, while the existing technical preparation method is to add urea to 2,6-lutidine In lutidine, the amount added is about 1.5 times the number of moles of 2,6-lutidine, reacted at 75 degrees Celsius for 4 to 5 hours, filtered, put the complex in toluene and heated to autoboiling decomposition , Take the toluene solution and distill off the toluene to obtain 2,6-lutidine. [0003] However, in the above-mentioned prior art scheme, the reaction initial temperature is too low to make urea and 2,6-lutidine react well, and because it is a two-phase reaction, the yield of the reaction is not high. [0004] Therefore,...

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 Patents(China)
IPC IPC(8): C07D213/16
Inventor 谢解锋杨泽静周磊磊孙迦宾
Owner 上海鼎素精细化工有限公司