The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 22, 2006
Filed:
Apr. 15, 2004
Abraham Robert DE Kraker, Sugar Land, TX (US);
Steven Allen Holmes, Houston, TX (US);
Krishna Rangraj Kaushik, Houston, TX (US);
Abraham Robert De Kraker, Sugar Land, TX (US);
Steven Allen Holmes, Houston, TX (US);
Krishna Rangraj Kaushik, Houston, TX (US);
Shell Oil Company, Houston, TX (US);
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 SOor SO, 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.