The Collaborative International Dictionary of English v.0.48:
Desulphurize \De*sul"phur*ize\, v. t. To desulphurate; to deprive of sulphur. -- De*sul`phur*i*za"tion, n. [1913 Webster]WordNet (r) 3.0 (2006):
desulphurize v 1: remove sulfur from [syn: desulfurize, desulphurize]