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

Method for preparing urotropin by ammoxidation of methanol in presence of vanadium compound catalyst

A technology of urotropine and vanadium compounds, which is applied in the field of ammonia oxidation of methanol to prepare urotropine, can solve the problems of long storage time, high cost, unstable formaldehyde, etc., shorten the synthesis steps, improve production efficiency, improve The effect on total yield

Inactive Publication Date: 2010-06-16
ZHEJIANG NORMAL UNIVERSITY
View PDF1 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that it can only be synthesized with high-quality formaldehyde as a raw material, and the cost is relatively high.
Moreover, formaldehyde is unstable, and the storage time is too long and easy to deteriorate. After the concentration is reduced, it cannot be used as a raw material for synthesizing urotropine, and it pollutes the environment.

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 1

[0022] Add 70% methanol solution, 25% ammonia solution, and 20% hydrogen peroxide solution into the reaction kettle at a ratio of 2:1:4, add a vanadium compound catalyst, and control the pH value of the reaction solution between 4 and 4.5. Keep the temperature between 50°C and 55°C and stir for 180 minutes.

[0023] After the reaction is completed, the reaction solution is taken out, and alkali is added to adjust the pH value between 8 and 10, the catalyst is allowed to settle, separated by filtration and recovered for reuse.

[0024] The filtrate is post-treated, unreacted methanol is recovered for the second ammoxidation reaction, and the final product urotropine is obtained through steps such as evaporation, concentration, recrystallization, and dehydration.

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 a method for preparing urotropin, in particular to a method for one-step synthesizing urotropin by the ammoxidation of methanol in the presence of a vanadium compound catalyst, wherein the elements contained in the catalyst and a ratio of the elements are as shown in a component formula: VDmOx. The method has the advantages of simple reaction step, rapid production speed, low cost, less energy consumption, contribution to environmental protection and the like.

Description

technical field [0001] The invention relates to a method for preparing urotropine by ammoxidizing methanol. Background technique [0002] The scientific name of urotropine is hexamethylenetetramine, and its molecular formula is (CH 2 ) 6 N 4 , Molecular weight M=140.19, white crystalline powder, widely used in pharmaceuticals, pesticide raw materials, high-energy fuels, ester-formaldehyde resin curing agents, urea-formaldehyde resin catalysts, rubber accelerators, etc. [0003] The production process of urotropine commonly used at present is that formaldehyde and ammonia water are heated, evaporated, condensed and crystallized. Its disadvantage is that it can only be synthesized with high-quality formaldehyde as a raw material, and the cost is relatively high. Moreover, formaldehyde is unstable, and the storage time is too long and easy to deteriorate. After the concentration is reduced, it cannot be used as a raw material for synthesizing urotropine, and it pollutes the...

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
IPC IPC(8): C07D487/18B01J23/22
Inventor 吕耀康苏虹冯云龙
Owner ZHEJIANG NORMAL UNIVERSITY