Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Process for synthesizing methyl mercapto benizmidazole by using TDI byproducts

A technology of methylmercaptobenzimidazole and by-products is applied in the field of chemistry to achieve the effects of good product quality, promotion of comprehensive development and utilization, and easy operation and control

Active Publication Date: 2008-07-09
沧州大化集团有限责任公司
View PDF2 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies in the prior art and effectively solve the problem of the development and utilization of the by-product hydrogenated organic residues of the TDI production unit, the present invention provides a method for synthesizing methylmercaptobenzene using methyl-o-phenylenediamine in the hydrogenated organic residues of the TDI by-products. The method of imidazole makes it have the advantages of simple and convenient process, easy operation and control, low equipment investment, low production cost, good product quality, and is also conducive to environmental protection, utilization of resources, and can be used in industrialized production

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
  • Process for synthesizing methyl mercapto benizmidazole by using TDI byproducts
  • Process for synthesizing methyl mercapto benizmidazole by using TDI byproducts
  • Process for synthesizing methyl mercapto benizmidazole by using TDI byproducts

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0012] Example 1: 1000L reactor with a condenser, add 350L water in the reactor, and heat it into hot water at 70°C, hydrogenate 65 kg of TDI by-product with a content of 83.6% of methyl-o-phenylenediamine Add the organic residue into the hot water in the reaction kettle. After it is completely dissolved, slowly add 40L of carbon disulfide contained in the metering tank into the kettle according to the molar ratio of methyl o-phenylenediamine and carbon disulfide as 1:1.5, and control the condenser Reflux can be seen in the middle, after the addition of carbon disulfide, the temperature is raised to 100°C, and the reaction is completed at a constant temperature for 2 hours. The crude product of methylmercaptobenzimidazole is dissolved in sodium hydroxide solution, decolorized by activated carbon, precipitated by sulfuric acid, washed, filtered, and dried Dried and pulverized, 71.28 kilograms (97.68 percent of recovery) of product methylmercaptobenzimidazole of the present inven...

example 2

[0013] Example 2: In the 1000L reactor of the condenser, add 400L of water, heat to 75°C, add 80 kilograms of methyl o-phenylenediamine weighed to the hydrogenated organic residue of 96.8% TDI by-product hydrogenation in the hot water of the reactor, After completely dissolving, according to the molar ratio of methyl o-phenylenediamine and carbon disulfide as 1:1.4, slowly add 54L of carbon disulfide contained in the metering tank into the kettle, and control the visible reflux in the condenser. After adding carbon disulfide, raise the temperature To 90 ° C, constant temperature reaction for 3 hours to complete the reaction, the crude product of methylmercaptobenzimidazole produced by the reaction is dissolved in sodium hydroxide solution, activated carbon is decolorized, hydrochloric acid is precipitated, washed, pressure filtered, dried, and pulverized to obtain the present invention 101.02 kg of product methylmercaptobenzimidazole (97% recovery rate).

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 present invention is process of synthesizing methyl mercapto benzimidazole with TDI by product, belongs to the field of chemical technology, and aims at utilizing the hydrogenated organic slime from TDI production. The synthesis process with the TDI by product as material includes dissolving methyl o-phenylenediamine in water solution at certain temperature, adding carbon bisulfide in the molar ratio to methyl o-phenylenediamine of 0.8-2.0 to 1, heating to certain temperature for reaction for certain period, alkali dissolving, decolorizing with active carbon, acid separating, press filtering, washing and stoving to obtain methyl mercapto benzimidazole. The process is simple, feasible and easy in control and may be used in industrial production, and the methyl mercapto benzimidazole product may be used widely in rubber industry.

Description

technical field [0001] The invention relates to a process method for producing chemical products by using chemical industry by-products in the field of chemical technology, in particular to a method for synthesizing methylmercaptobenzimidazole by using TDI to hydrogenate organic residue by-products. Background technique [0002] With the rapid development of the chemical industry, it is becoming more and more important to develop and utilize chemical industry residues to reduce pollution and make full use of resources. In the prior art, in the industrialized production of TDI (toluene diisocyanate), the toluene diamine TDA obtained after toluene is nitrated and hydrogenated, and the m-toluene diamine MTD in the toluene diamine TDA are removed by the de-adjacent tower Purified and used as raw materials for TDI production, the remaining main components of methyl-o-phenylenediamine are TDI hydrogenated organic residues. Most of the existing TDI production enterprises send TDI ...

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): C07D235/28
Inventor 蔡文生车宏斌王冠顺
Owner 沧州大化集团有限责任公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com