Kinetics and process optimization of synthesis of methyl ester sulfonate in T-type microreactor
The internal temperature distributes unevenly for the synthesis of methyl ester sulfonate in falling film reactor,leading to the decrease in productivity.Considering the efficient reaction characteristics of microreactor,the present paper attempted to synthesize methyl ester sulfonate in a T-type microreactor.The effects of temperature,molar ratio,aging time,aging temperature and other factors on the content of active substances of the product(the mass fraction of the active content of the product)in the sulfonation reaction process were investigated.The response surface method was used to explore the influence degree and interaction of the above influencing factors on the content of active substances,and the process conditions were optimized on this basis.According to the analysis,the influence order of above factors on the content of active substances was:molar ratio of sulfur trioxide to methyl stearate>aging temperature>sulfonation temperature>aging time.The optimization results showed that when the sulfonation temperature was 86.4℃,the molar ratio of SO3 to methyl stearate was 1.4,the aging time was 47min and the aging temperature was 90℃,the active content of the product was 88.1%,which was about 5%higher than that of industrial synthesis.The kinetic equation of SO3 sulfonation reaction of methyl ester in microreactor system was established and the kinetic parameters were fitted,which provided the basis for the process control,product prediction and reactor structure optimization.The NSGA2 algorithm was used to proceed double-target optimization for the reaction process,and combing the TOPSIS method,the best process conditions were selected from the Pareto solution set.
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