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Class Information
Number: 562/96
Name: Organic compounds -- part of the class 532-570 series > Organic compounds (class 532, subclass 1) > Sulfonic acids or salts thereof (i.e., compounds containing the sulfonate group, -s(=o)(=o)-o- wherein the single bonded oxygen is bonded directly to hydrogen, or to a group ia or iia light metal or to substituted or unsubstituted ammonium) > Benzene ring bonded directly to the sulfonate sulfur (e.g., purification and neutralization of benzene sulfonic acids, etc.) > Sulfonate group and alkyl group of at least four carbons bonded directly to the same benzene ring > Purification or recovery
Description: Processes wherein the sulfonic acid, or salt thereof, is separated from impurities or from the reaction mixture.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6087529 |
Process for the stabilization of alkylbenzenesulphonates |
Jul. 11, 2000 |
| 5434301 |
Methods for recovery of acids |
Jul. 18, 1995 |
| 4910334 |
Recovery of overbased alkaline earth metal additives from centrifugates |
Mar. 20, 1990 |
| 4910335 |
Decolorization of alkanesulfonic and arenesulfonic acids |
Mar. 20, 1990 |
| 4747972 |
Sulfonic acid compositions having reduced sulfur-containing contaminants |
May. 31, 1988 |
| 4677074 |
Process for reducing sulfur-containing contaminants in sulfonated hydrocarbons |
Jun. 30, 1987 |
| 4618458 |
Sulphonic acids and sulphonates |
Oct. 21, 1986 |
| 4614597 |
Recovery of oil and sulfonate from filter cake |
Sep. 30, 1986 |
| 4321214 |
Extreme purification of sulfonic-type acids for processing to highly overbased metal sulfonates |
Mar. 23, 1982 |
| 4302403 |
Process for reacting sulfuric acid and an aromatic hydrocarbon to purify a disulfonic acid product of an aromatic hydrocarbon |
Nov. 24, 1981 |
| 4277351 |
Method for improving sulfonate surfactants used in enhanced recovery processing in subterranean oil-bearing formations |
Jul. 7, 1981 |
| 3997575 |
Bleaching method for sulfonic acid |
Dec. 14, 1976 |
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