Evaluation of calcium chloride for synergistic demulsification of super heavy oil wastewater

Kun Tong; Yihe Zhang; Paul K. Chu

doi:10.1016/j.colsurfa.2012.11.047

Author(s)

Kun Tong
Yihe Zhang
Paul K. Chu

Detail(s)

Original language	English
Pages (from-to)	46-52
Journal / Publication	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	419
Publication status	Published - Feb 2013

Link(s)

DOI	DOI https://doi.org/10.1016/j.colsurfa.2012.11.047 Final Published version
	Check@CityULib
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-84871562612&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(d9836d94-3fda-4e25-8486-c7d8951906a6).html

Abstract

Calcium chloride (CaCl₂) is used together with cationic poly (dimethylamine-co-epichlorohydrin) (P-DcE) and cationic polyacrylamine (CPAM) to demulsify super heavy oil wastewater. A new reverse emulsion breaker (REB) with the optimal ratio of P-DcE to CaCl₂ to CPAM of 20:600:1.2 (m/m) can remove 98.04% mineral oil and 94.48% COD. Compared to P-DcE used alone and P-DcE supplemented with concentrated sulfuric acid to enhance demulsification, the advantages of the REB are high removal rates for mineral oil and COD, low cost, and environmental friendliness. GC-MS indicates that the REB can remove more organic compounds such as mineral oils than other agents and most of the residues are oilfield chemicals such as corrosion inhibitors, scale inhibitors, biocides, and demulsifiers. The REB, which exhibits good efficiency in anaerobic digestion and synergistic demulsification of SHOW arising from CaCl₂, is efficient, safe, and economical. © 2012 Elsevier B.V.