Process for the preparation of secondary alkyl sulfate-containing surfactant compositions
AssigneeShell Oil Company
InventorsEugene F. Lutz, David K. Schisla, Robert S. Tomaskovic, Timothy D. Hoewing
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Abstract
This invention relates to solid secondary alkyl sulfate-containing surface active compositions which are formed by crystallization and which contain at least about 80 percent by weight of secondary alkyl sulfate. These compositions are substantially free of unreacted organic matter and water. The invention further relates to a process for preparing these solid secondary alkyl sulfate-containing compositions.
Claims32
A process for preparing a solid secondary alkyl sulfate-containing surface active composition which comprises:
- a) preparing a detergent range alkyl sulfuric acid-containing solution,
- b) contacting said detergent range alkyl sulfuric acid-containing solution with a base in aqueous solution,
- c) heating the product of step b) to saponify dialkyl sulfate and to remove substantially all of the water from the mixture,
- d) cooling the product of step c) in the presence of a nonionic organic liquid diluent to crystallize a solid secondary alkyl sulfate-containing surface active composition from the mixture, and
- e) recovering and drying the crystallized solid secondary alkyl sulfate-containing surface active composition.
A process for preparing secondary alkyl sulfate-containing surface active compositions substantially free of unreacted organic matter and water, which process comprises:
- a) sulfating a reactant selected from the group consisting of detergent range olefins, detergent range alcohols and mixtures thereof,
- b) neutralizing the sulfation product of step a) with a base in aqueous solution,
- c) saponifying the product of step b),
- d) crystallizing the product of step c), and
- e) recovering and drying the secondary alkyl sulfate-containing product from the product of step d), wherein a nonionic organic liquid diluent is added prior to step d).
Dependencies are inferred from the claim text.