Issue 75, 2016

Sustainable process for the preparation of potassium sulfate by electrodialysis and its concentration and purification by a nanofiltration process

Abstract

A sustainable approach for the production of high purity potassium fertilizer (K2SO4) is highly needed to cope with the food crisis. High value K2SO4 produced by the conventional process as well as by metathesis electrodialysis (mED) contains precursor salts as impurities. With the increase of produced K2SO4 concentration, the amount of impurity in the product also increases. Hence, a suitable strategy is required for the rapid and effective production of high concentration and relatively pure K2SO4. Herein, we report a combination of electrodialysis and nanofiltration (NF) processes for the scalable production, purification and concentration of K2SO4. Several parameters such as applied voltage, ratio of the reactants (Na2SO4 and KCl) and their concentrations were optimized to obtain K2SO4 with relatively high concentration along with good purity via the mED process. The K2SO4 obtained by mED was further subjected to NF using a poly(piperazineamide) thin film composite NF membrane to concentrate and to eliminate the chloride (Cl) and associated monovalent cations from the product stream. The NF parameters such as feed pH and applied pressure were adjusted to obtain a high concentration of aqueous K2SO4 with purity as high as ca. 99%. This process thus provides a suitable way for the production and recovery of solid K2SO4.

Graphical abstract: Sustainable process for the preparation of potassium sulfate by electrodialysis and its concentration and purification by a nanofiltration process

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
02 Jun 2016
Accepted
13 Jul 2016
First published
19 Jul 2016

RSC Adv., 2016,6, 71807-71817

Sustainable process for the preparation of potassium sulfate by electrodialysis and its concentration and purification by a nanofiltration process

J. S. Trivedi, V. Bhadja, B. S. Makwana, S. K. Jewrajka and U. Chatterjee, RSC Adv., 2016, 6, 71807 DOI: 10.1039/C6RA14303B

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements