Process for production of essentially chloride-free calcium sulfonate
AssigneeShell Oil Company
InventorsAbraham Robert De Kraker, Steven Allen Holmes, Krishna Rangraj Kaushik
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Abstract
The invention relates to a process for the preparation of a low-base number calcium sulfonate that is essentially chloride free. The process involves preparing a sulfonic acid solution by adding a solvent to a sulfonic acid, optionally removing dissolved or entrained SO2 or SO3, mixing the solution with a specific amount of water and calcium hydroxide, heating the mixture, separating out excess calcium hydroxide from the mixture, removing the solvent and recovering the calcium sulfonate product in oil.
Claims27
A process for the production of low base number calcium sulfonates comprising:
- a. preparing a sulfonic acid-oil solution by adding about 1 to about 20 volumes of a miscible solvent to a sulfonic acid-oil feedstock, centrifuging said solution and removing dissolved or entrained SO2 or SO3 via stripping if present;
- b. mixing the sulfonic acid-oil solution with about 1 to about 5 moles of water per mol of sulfonic acid and about 1 to about 10 moles of calcium hydroxide per mole of sulfonic acid to provide a reaction mixture;
- c. heating the reaction mixture to a temperature in the range of about 40° C. to about 200° C.;
- d. separating excess calcium hydroxide from the heated-reaction mixture to produce a reaction product comprising solvent, oil, and calcium sulfonate;
- e. removing the solvent from the reaction product to produce an intermediate product comprising oil and calcium sulfonate;
- f. optionally concentrating the intermediate product by removing at least a portion of the oil to produce a concentrated product;
- and
- g. recovering the intermediate product and/or concentrated product, wherein the product is essentially chloride free calcium sulfonate in oil.
A process for the production of low base number calcium sulfonate comprising:
- a. preparing a sulfonic acid solution in oil by adding about 1 to about 20 volumes of a miscible solvent to sulfonic acid and removing dissolved or entrained SO2 or SO3 if present;
- b. mixing the sulfonic acid solution in oil with about 1 to about 5 moles of water per mol of sulfonic acid and about 1 to about 10 moles of calcium hydroxide per mole of sulfonic acid to produce a reaction mixture;
- c. heating the reaction mixture with stirring to a temperature between about 40° C. and about 200° C.;
- d. separating excess calcium hydroxide from the heated-reaction mixture;
- and
- e. recovering the essentially chloride free calcium sulfonate product from the separated-reaction mixture by removing the solvent,
- wherein the product after solvent removal is further concentrated by removing at least a portion of the oil.
Dependencies are inferred from the claim text.