Technology - CASOX
April 9, 2003

Introduction

The CASOX Process is a SOx removal process using catalytic SOx-Oxidation using a newly developed high performance de-sulphurizing catalyst.  The CASOX Process leads to significant reductions in construction and operating costs, compared with conventional flue gas de-sulphurization processes such as lime scrubbing. Concentrated sulphuric acid, gypsum and ammonium sulphate can be produced as by-products of this process.

The process is easy to operate and maintain since the gas to be treated is simply passed though the catalyst bed.  The use of a monolith catalyst (i.e. honeycomb) enables the process to handle gases containing dust.

The CASOX Process adsorbs sulphur dioxide gas and oxidizes it with oxygen to form sulphur trioxide.  The presence of water vapour results in the formation of sulphuric acid which is removed and recovered.   The concentration of sulphuric acid is approximately 60%.  Since the acid formed is continuously removed, there is no requirement to regenerate the catalyst.