On-Line NMR Spectroscopic Reaction Kinetic Study of Urea鈥揊ormaldehyde Resin Synthesis

详细信息    查看全文

• 作者：脡l茅onore J. Kibrik ; Oliver Steinhof ; G眉nter Scherr ; Werner R. Thiel ; Hans Hasse
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：August 13, 2014
• 年：2014
• 卷：53
• 期：32
• 页码：12602-12613
• 全文大小：511K
• ISSN：1520-5045

文摘

Quantitative on-line NMR spectroscopy is used to study the kinetics of the reaction of aqueous formaldehyde and urea. The investigation focuses on the formation of low molecular mass compounds during the methylolation step. The experiments were carried out at overall formaldehyde to urea molar ratios between 1:1 and 4:1, pH values between 6 and 8, and temperatures between 313 and 353 K. The experimental data were used to develop a kinetic model based on the true species concentrations. The model describes the experimental data well and can be used to predict the composition of the reacting mixture of aqueous formaldehyde and urea during the methylolation step as a function of time.