Complex oxide catalysts of acrylic acid obtaining by aldol condensation method

Roman Nebesnyi

doi:10.15587/1729-4061.2015.37405

Abstract

The present work is dedicated to solving the problem of diversification of the raw materials base for acrylate monomers obtaining, first of all acrylic acid. Acrylic acid and its derivatives are bulk products of organic synthesis with a wide range of applications. The main industrial method of acrylic acid production is propylene oxidation. But this method has instable economic indicators as propylene is petroleum origin raw material. It is possible to expand the resource base of acrylic acid production, in particular, by creating a technology of its production by aldol condensation of acetic acid and formaldehyde. The key step of this technology creation is improvement of the process catalysts efficiency. For this aim, new composite oxide catalysts B 2 O 3 -P 2 O 5 -WO 3 -V 2 O 5 /SiO 2 , allowing to obtain acrylic acid with 57.4% yield and formation selectivity 93.7%, have been developed and explored. In this paper the effect of the catalyst components content on the initial reactants conversion and acrylic acid formation selectivity has been researched; the optimal catalyst composition and optimal conditions for the aldol condensation of acetic acid with formaldehyde to acrylic acid have been determined. The high performance of the developed catalyst confirms prospects of using the method of acrylic acid obtaining by aldol condensation as an alternative.

Highlights

Acrylic acid (АA) is a valuable chemical industry product, with the world capacity over 4.5 million ton per year
Among the drawbacks of AA obtaining by the oxidation method, there is formation of great number of by-products, including the products of destructive oxidation (СО and СО2) [1]. Another feature of AA obtaining by the propylene oxidation is a direct dependence of economic efficiency of the method on world price of the corresponding raw material, which varies within wide limits and in the long run tends to increase
A problem of diversification of raw materials base of AA production appears, which causes the high relevance of the development of new methods of its production

Summary

Introduction

Acrylic acid (АA) is a valuable chemical industry product, with the world capacity over 4.5 million ton per year. The most common method of AA production is the twostep propylene oxidation via intermediate stage of acrolein formation.This method has worked well in terms of economic efficiency and in terms of a simple hardware design. Among the drawbacks of AA obtaining by the oxidation method, there is formation of great number of by-products, including the products of destructive oxidation (СО and СО2) [1]. Another feature of AA obtaining by the propylene oxidation is a direct dependence of economic efficiency of the method on world price of the corresponding raw material (oil), which varies within wide limits and in the long run tends to increase. A problem of diversification of raw materials base of AA production appears, which causes the high relevance of the development of new methods of its production

State of the art and problem statement

The purpose and objectives of the study

Catalysts preparation and characterization

Findings

Conclusions