Process for preparing a sulfonated dispersant from petroleum asphalt fractions
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United States of America Patent
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Jun 21, 1994
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N/A
app pub date -
Mar 8, 1993
filing date -
Dec 21, 1989
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Abstract
A process for preparing a sulfonated dispersant from a petroleum asphalt fraction, comprising: establishing contact between the asphalt fraction dissolved in an inert solvent and liquid or gaseous sulfur trioxide at a temperature equal to or less than 60.degree. C., to obtain a sulfonated asphalt fraction; salifying the sulfonated asphalt fraction thus obtained by contact with an aqueous solution of a hydroxide of an alkaline metal, alkaline earth metal or ammonium and recovering the sulfonated salt from the reaction mixture. This process provides water-soluble sulfonated salts of petroleum asphalt fractions, which can be used as fluidifying and stabilizing agents for aqueous dispersions of solids, such as aqueous dispersions of coal or cement.
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