Clean ion-exchange technologies. I. Synthesis of chlorine-free potassium fertilizers by an ion-exchange isothermal supersaturation technique

Dmitri Muraviev, Ruslan Kh Khamizov, Nikolai A. Tikhonov, Anna N. Krachak, Tatyana I. Zhiguleva, Olga V. Fokina

Research output: Contribution to journalArticleResearchpeer-review

14 Citations (Scopus)

Abstract

This paper reports the results of studying ion-exchange synthesis of chlorine-free potassium sulfate from KCl and Na2SO4 on strong acid cation-exchange and strong base anion-exchange resins using an ion-exchange isothermal supersaturation (IXISS) effect. This effect is observed for a number of ion-exchange systems, where the ion-exchange process is accompanied by the formation of a stable supersaturated solution of slightly or sparingly soluble substances in the interstitial space of ion-exchange columns. The formation of stable K2SO4 solutions in the columns has been observed by the displacement of either K+ or SO42- ions from a cation or anion exchanger with concentrated Na2SO4 or KCl solutions, respectively. After leaving the column, a supersaturated solution crystallizes spontaneously, which allows for the design of a practically ideal ion-exchange process where a crystalline chlorine-free potassium sulfate is obtained right after the ion-exchange conversion cycle. The process is practically wasteless and ecologically clean; hence, it can be considered as a competitive alternative to existing K2SO4 production technologies based on, e.g., the Mannheim process. The flow sheet of a proposed process is presented and discussed.
Original languageEnglish
Pages (from-to)1950-1955
JournalIndustrial and Engineering Chemistry Research
Volume37
Issue number5
DOIs
Publication statusPublished - 1 Jan 1998

Fingerprint Dive into the research topics of 'Clean ion-exchange technologies. I. Synthesis of chlorine-free potassium fertilizers by an ion-exchange isothermal supersaturation technique'. Together they form a unique fingerprint.

Cite this