Process for preparing sulphonated dispersants

Details Process for preparing sulphonated dispersants Process for preparing sulphonated dispersants

C - Chemistry, Metallurgy

08

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6/158, 134/55, 2

C08L 95/00 (2006.01) C07G 99/00 (2009.01) B01F 17/00 (2006.01) C04B 24/20 (2006.01) C07C 303/06 (2006.01) C07C 309/28 (2006.01) C10L 1/32 (2006.01)

Patent

CA 2005278

CASE 2971 PROCESS FOR PREPARING SULPHONATED DISPERSANTS ABSTACT Sulphonated dispersants are prepared by a process comprising: - bringing liquid or gaseous sulphur trioxide into contact under sulphonation conditions with a solution of a tar in liquid sulphur dioxide, - removing the sulphur dioxide from the reaction mixture by vaporization and recovering the sulphonated tar, and - salifying the sulphonated tar with an aqueous solution of an alkaline metal hydroxide or ammonium hydroxide. The sulphonated dispersants prepared in this manner are completely water soluble and are particularly useful as fluidifying and stabilizing agents in aqueous dispersions of solids such as coal and cement.

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