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The Studies on Technology of MC and DMC Synthesized by Urea Alcoholysis
Author: HuangLiangJie
Tutor: XueWeiZuo
School: East China University of Science and Technology
Course: Chemical processes
Keywords: Carbamate Dimethyl carbonate Urea alcoholysis Henry constant
CLC: TQ225.24
Type: Master's thesis
Year: 2011
Downloads: 147
Quote: 0
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Abstract
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Based on methanol, urea as raw material, under pressurized conditions the alcoholysis reaction of the preparation of methyl carbamate (MC) and through the orthogonal experiment the process conditions of the reaction was studied, and determine its influencing factors in the order: mole ratio of methanol/urea gt; Reaction temperature gt; Gt exhaust emission rate; Reaction time, and suitable process conditions were obtained, the yield of MC could reach 84.67%. With methanol and urea as raw material, dibutyl tin oxide as catalyst under step diol dimethyl carbonate (DMC) was synthesized and the reaction process and mechanism are studied. Through orthogonal experiment to determine the main factors influencing the reaction yield in the order: reaction temperature gt; Gt; reaction time Mole ratio of methanol/urea gt; Of catalyst, suitable process conditions were obtained, the yield of DMC could reach 23.13%. The constant volume in K (277.35 328.15), respectively, under the condition of the highest pressure 0.72 MPa, the determination of the ammonia solubility in the ethanol and isopropyl alcohol, using the second virial coefficients to estimate the temperature of the Henry constant, and won the ammonia - Henry constant of ethanol system and the relation between the temperature.
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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
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