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ZnO catalyzed alcoholysis of urea manufacturing process and kinetics of methyl carbamate

Author: JiaHaiFeng
Tutor: WangYaMing
School: Kunming University of Science and Technology
Course: Chemical Engineering
Keywords: Zinc oxide Methanol Urea Carbamate Reaction kinetics
CLC: TQ225.241
Type: Master's thesis
Year: 2009
Downloads: 54
Quote: 0
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Abstract


Carbamates with rich functional groups , is an important intermediate for organic synthesis , is being more widely appreciated . For this reason, many people have developed a method of preparing carbamate compounds , in which the Asian Arts urea alcoholysis process is more excellent synthesis method is promising . In this paper the reaction of urea and methanol in the volume of the medium 1OL reactor temperature and pressure carbamate prepared in (MC) were studied to optimize its process parameters and establishment of relevant dynamic model . The following conclusions : 1 ) zinc oxide as a catalyst , ' The effects of reaction temperature, reaction time , amount of catalyst and other process parameters on the yield of MC . Get optimum reaction conditions: Temperature : 145 ℃; reaction time : 2.5h; catalyst amount : 0.5% ( relative to the total reactants ) ; speed: 200 r / min . MC highest concentration of up to 14.19% . 2 ) the use of pressure - vacuum distillation method purification carbamate , Qi's tube method using purified MC measured melting point of the sample at about 5 ℃ melting range , indicating that the initial processing of MC purity is not high . 3 ) to establish a urea synthesis solution carbamate alcohol at a temperature and pressure of the kinetic model to arrive without use of a catalyst and the use of zinc oxide as catalyst, the reaction stages are 3, but its dynamic model there are differences . Without catalyst kinetic model : r = - (?) = 3.0596 × 1010e-10326.70/tCA3 zinc oxide as a catalyst kinetic model : r = - (?) = 1.3982 × 108e-8798.42/TCA3 and draw catalyst dosage and reaction rate constant relationship : K = 0.437 0.24251Ccat ( correlation coefficient R = 0.98593) for the above conclusions alcoholysis of urea synthesis of methyl carbamate industrial tests provide basic data and theoretical guidance.

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aliphatic compounds ( acyclic compounds) > Aliphatic carboxylic acid and its derivatives > Carboxylic acid derivatives of the function > Ester > Yuan ester
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