ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Losses of an iron complex and ethylenediaminetetraacetic acid during gas desulfurization

Petr Buryan

, Institute of Chemical Technology Prague, Prague 6, Czech Republic

E-mail: buryanp@vscht.cz

Abstract: All the studies that have been published on the reduction of chelating-agent efficiency in the process of hydrogen-sulfide removal from various industrial and natural gases have focused on the relation between efficiency drop and the oxidative degradation of chelates. This study reveals that a significant loss of the chelating agent during gas desulfurization is caused not only by the oxidative degradation of chelates but also by its losses through sorption on solid sulfur. Recent findings allow to substantially reduce significant loss of chelate by adjusting the pH of the wash solution separated sulfur to <1.5 and to increase sulfur recovery application in many technological processes, wherein the content of undesirable iron was still a significant limiting factor.

Keywords: Gas desulfurization; Ferric chelate; EDTA

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-016-0075-6

Chemical Papers 71 (3) 673–677 (2017)