Investigation on Thermodynamics in Separation for Ethylene Glycol + Neopentyl Glycol System by Azeotropic Distillation

Abstract

The isobaric vapor−liquid equilibrium (VLE) data for two binary systems of ethylene glycol (EG) + neopentyl glycol (NPG) and NPG + para-xylene (PX) have been measured under pressure of 101.3 kPa, respectively. The thermodynamic consistency of the experimental isobaric VLE data was tested by means of Herington area test. Meanwhile, the experimental isobaric VLE data have been satisfactorily correlated with Wilson, NRTL, and UNIQUAC models. A conventional azeotropic distillation process has been designed to achieve high-purity products based on preceding results. The product purities of EG and NPG can both achieved at 99.9 mol % with minimal total annual cost (TAC) through sequential iterative optimization procedure.

Geometric effect promoted hydrotalcites catalysts towards aldol condensation reaction

“…Serving as a critical aspect of synthetic chemistry applied in numerous industrial processes, base-catalyzed aldol condensation reactions have caused considerable attention so as to produce various value-added chemicals with all kinds of industrial applications [14]. Among these condensation processes, the reaction of isobutyraldehyde (IBD) with formaldehyde (FA) serves as a crucial process to produce hydroxypivalaldehyde (HPA), which is an important intermediate for production of neopentyl glycol (NPG) widely used in the manufacturing of polyesters, lubricants, plasticizers, and synthetic resin coatings [5,6]. Generally, homogeneous catalysts such as triethylamine, NaOH and KOH have been widely used in this reaction due to cost effectiveness and high activity; whereas, they show disadvantages in separation and recovery, and are unable to meet the increasingly stringent requirements for environmental benignity and sustainability [79].…”

Optimization of the composition of mixed entrainer for economic extractive distillation process in view of the separation of tetrahydrofuran/ethanol/water ternary azeotrope

“…Special distillation processes such as azeotropic distillation, pressure‐swing distillation, and extractive distillation are widely used for separating azeotropes. Extractive distillation (ED) can change the relative volatility between the light and heavy components by adding a third component called entrainer and has been widely and deeply studied for separating binary azeotropic mixtures.…”

Mechanism Analysis, Economic Optimization, and Environmental Assessment of Hybrid Extractive Distillation–Pervaporation Processes for Dehydration of n-Propanol

“…Several special distillation methods, such as azeotropic distillation, − pressure-swing distillation, , and extractive distillation (ED), − have been widely used in the separation of azeotropes. ED is one of the common separation methods in the chemical process with the help of entrainers. , The boiling point of entrainers is much higher than that of the components of the azeotrope.…”