Factors Influencing the Formation of Salicylic Acid by Bipolar Membranes Electrodialysis.

Juan Taumaturgo Medina-Collana,Jorge Alberto Montaño-Pisfil,Jimmy Aurelio Rosales-Huamani,Elmar Javier Franco-Gonzales

doi:10.3390/membranes12020149

Juan Taumaturgo Medina-Collana, Jorge Alberto Montaño-Pisfil + Show 2 more

Open Access

https://doi.org/10.3390/membranes12020149

Copy DOI

Abstract

Salicylic acid is an intermediate product in the synthesis of dyes, medications and aspirin. An electrodialysis module has been constructed with commercial cationic, anionic and bipolar membranes for the conversion of sodium salicylate into salicylic acid. The effect of operating conditions such as applied electric potential, salt concentration, initial acid concentration and volumetric flow on bipolar membrane electrodialysis (BMED) yields were investigated using Taguchi analysis. The results obtained in 210 min of work show an average concentration of salicylic acid of 0.0185 M, an average electric current efficiency of 85.3%, and a specific energy consumption of 2.24 kWh/kg of salicylic acid. It was concluded that the proposed bipolar membrane electrodialysis process is an efficient alternative to produce salicylic acid (SAH) from sodium salicylate (SANa) in an environmentally friendly manner. Furthermore, the production of sodium hydroxide was obtained as a by-product of the process carried out.

Highlights

Salicylic acid or 2-hydroxybenzoic acid is widely distributed in the plant kingdom [1], and is most used for its analgesic, antipyretic and anti-inflammatory properties [2]
The experiment involved the use of three types of membranes, cation exchange (CEM), anion exchange (AEM), and bipolar membrane (FBM) were supplied by the company (Fumatech Bwt GmbH, Bietigheim Bissingen, Germany) for the study
The Taguchi method produces the mean of means results, as indicated in Figures 6–8, respectively

Summary

Introduction

Salicylic acid or 2-hydroxybenzoic acid is widely distributed in the plant kingdom [1], and is most used for its analgesic, antipyretic and anti-inflammatory properties [2]. Salicylic acid (SAH) is an important raw material that has been used as an intermediate to synthesize drugs (such as aspirin) and cosmetics (used for the treatment of seborrheic dermatitis) [3]. The intermediate is transformed into sodium salicylate (SANa) by a carboxylation reaction under conditions of high pressure, high temperature and CO2 atmosphere. Salicylic acid is obtained by acidification using a huge amount of H2SO4. This process will consume a considerable amount of H2SO4, but will generate numerous Na2SO4 waste solutions with a concentration greater than 0.1% w/w [5].

Methods

Results

Conclusion