Kinetics of water-isocyanate reaction in <i>N,N</i>-dimethylformamide

Zhirong Chen; Weitao Yang; Hong Yin; Shenfeng Yuan

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Kinetics of water-isocyanate reaction in N,N-dimethylformamide

Catalysis, Kinetics and Reaction Engineering | Updated：2026-01-06

- Kinetics of water-isocyanate reaction in N,N-dimethylformamide
- Kinetics of water-isocyanate reaction in N,N-dimethylformamide
- 中国化学工程学报（英文版） 2017年25卷第10期页码：1435-1441
- Affiliations：
  
  College of Chemical and Biological Engineering, Zhejiang University,Hangzhou,China,310027
- Author bio：
- Funds：
- DOI：
  中图分类号：
- 纸质出版：2017
- Accepted：
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Zhirong Chen, Weitao Yang, Hong Yin, 等. Kinetics of water-isocyanate reaction in N,N-dimethylformamide[J]. 中国化学工程学报（英文版）, 2017,25(10):1435-1441.

-dimethylformamide[J]. , 2017, 25(10): 1435-1441.
Zhirong Chen, Weitao Yang, Hong Yin, 等. Kinetics of water-isocyanate reaction in N,N-dimethylformamide[J]. 中国化学工程学报（英文版）, 2017,25(10):1435-1441. DOI：

-dimethylformamide[J]. , 2017, 25(10): 1435-1441. DOI：

摘要

Abstract

The uncatalyzed reaction of

-tolyl isocyanate (

-TI) with water in

-dimethylformamide (DMF) was investigated by high performance liquid chromatography (HPLC). The reactions were carried out at different temperatures from 293 K to 323 K

using various molar ratios of water to

-TI. DMF

as a special amide

was proved to be an efficient catalyst for water-isocyanate reaction. Under the reaction conditions in this study

substituted urea was the only final product observed. An appreciable amount of intermediate

-toluidine was detected. Concentrations of the isocyanate group as well as the amine and urea were determined as a function of time. New kinetic equations were deduced for each of the substance on the basis of a multistep mechanism

instead of a simple second order reaction as usual. Kinetic constants were calculated using the software MATLAB. Furthermore

the effects of temperature and concentrations of reactants on the reaction rate and amine content were discussed. The activation energy of each step was also determined.

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Kinetics of water-isocyanate reaction in N,N-dimethylformamide

Kinetics of water-isocyanate reaction in N,N-dimethylformamide

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摘要

Abstract

关键词

Keywords

references