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Abstract

This study addresses the mathematical modelling and optimisation of a reactor for the esterification of safflower oil with n-butyl alcohol. To improve process controllability and reduce the need for numerous pilot-scale trials, an ideal-mixing continuous stirred-tank reactor (CSTR) model was adopted. Incorporating reaction kinetics, the effect of contact time on the relative viscosity of the product mixture was analysed. The modelling results indicate that achieving an acceptable degree of feedstock conversion is difficult when a single ideal-mixing reactor is used. Therefore, a CSTR cascade was proposed, and the configuration with N = 2 reactors was selected as the most appropriate solution in terms of metal consumption and economic efficiency. For a total contact time of 2 hours, the optimal residence-time distribution was determined: 1.1 hours in the first reactor and 0.9 hours in the second reactor. Experimental data obtained on a pilot unit were processed using the design of experiments (DoE) approach, resulting in regression equations describing the outlet product temperature and the recirculation fraction. The findings can be applied to the design of processes for producing additive (prisedka) formulations based on safflower oil, selection of reactor volume and operating conditions, and implementation of resource-efficient process control.

First Page

37

Last Page

41

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