A process for producing sodium asphalt sulfonate with gaseous sulfur trioxide has been developed with a systematic study of the main parameters which have influence on the performance of the products. After a description of a spectrophotometric method. The content of asphalt sulfonate in aqueous solutions and the adsorption of those products on British evaluation clay have been determined. The measurements of electric conductivity and surface tension for aqueous emulsions of the asphalt sulfonate have also been conducted. It is concluded that the adsorption on clays as well as the emulsification in aqueous solution are the two essential factors for asphalt sulfonate to reduce fluid loss.

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