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Study on Flashing Evaporation Separation Process of Isopropenyl Acetate in the Production of Acetylacetone

Author: ZhangZuo
Tutor: ZhuJiaWen；ZengYiHong
School: East China University of Science and Technology
Course: Chemical Engineering
Keywords: Isopropenyl acetate Flash Vaporization rate
CLC: TQ224
Type: Master's thesis
Year: 2012
Downloads: 12
Quote: 0
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Abstract


Acetylacetone as an important organic chemical intermediates , industrial production and use of ketene . Vinyl ketone, in the strongly acidic catalyst under the action of the method is a method of acetone absorption obtained by reacting isopropenyl acetate (IPA) the absorbing liquid , after separation and purification , isopropenyl acetate through high temperature thermal isomerization into acetylacetone . Separation of isopropenyl acetate directly affect the acetylacetone yield and purity . The separation of the absorbing liquid in the existing production process using a simple distillation kettle separated absorbing liquid , the material stays in the kettle long time , continuous heat deterioration of the heat-sensitive material , so the distillation post - kettle liquid enriched a lot of acetic anhydride , ketene polymer and acetyl sulfonyl acetic acid catalyst and high viscosity substances , resulting in the bottom of the kettle easily coke cause the raffinate discharge difficult . Thus the separation process should be rapid, in order to avoid absorbing liquid was distilled at a high temperature for a long time . This work is mainly to solve the problem : to isopropenyl acetate separation efficiency guarantee not occur coke . Based on the analysis on the basis of the presence of existing absorbing liquid separation coking problems , investigated the thermal stability of the IPA , and the thermal decomposition kinetics analysis . The experimental results show that , IPA decomposed in acidic under high temperature conditions , the experimental results provide some guidance for subsequent flash separation conditions . This paper the design and processing of a specialized set of flash laboratory equipment , flash technology and equipment research . Effects of the flash evaporator nozzle , feed flow rate , feed temperature and of flash pressure on flash vaporization rate . The results show that the diameter circular nozzles for absorbing liquid materials used , etc. , used for this experiment once flashed into a discharge temperature of 150 ° C , flash tank vacuum degree of 0.085MPa can reach the best separation effect . By material balance to determine the condition the flash vaporization rate of 90% , which IPA vaporization rate of 95 % , and the entire separation process does not occur coke jam . Separation of propylene carbonate Titanium provides a new method to achieve continuous process in the set of processes of industrial production will be acetylacetone .

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aliphatic compounds ( acyclic compounds) > Aliphatic aldehydes and ketones ( carbonyl compounds ) and its derivatives
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