Back to results
US 8,084,661 B2Granted
Extraction of ASO from spent sulfuric acid using liquid SO2
AssigneeCatalytic Distillation Technologies
InventorWilliam M. Cross, Jr.
Life of this patent
Estimating the term…
Abstract
A process for the regeneration of spent sulfuric acid including contacting spent sulfuric acid containing acid soluble oils (ASO) with sulfur dioxide to extract at least a portion of the ASO from the spent sulfuric acid into the sulfur dioxide. The sulfuric acid phase having a reduced ASO content and a sulfur dioxide phase containing at least a portion of the ASO may be recovered. The resulting sulfuric acid and sulfur dioxide phases may be further separated to recover ASO, sulfur dioxide, and sulfuric acid.
Claims19
A process for regeneration of sulfuric acid, comprising:
- contacting a spent sulfuric acid comprising sulfuric acid and acid soluble oils with sulfur dioxide, wherein at least a portion of the acid soluble oils partitions into the sulfur dioxide;
- recovering an extract fraction comprising the sulfur dioxide and at least a portion of the acid soluble oils;
- recovering a raffinate fraction comprising the spent sulfuric acid, having a reduced content of the acid soluble oils.
An alkylation process, comprising:
- contacting olefins and paraffins with sulfuric acid in an alkylation reaction zone;
- recovering an alkylate product from the alkylation reaction zone;
- recovering a spent sulfuric acid comprising sulfuric acid and acid soluble oils from the alkylation reaction zone;
- contacting at least a portion of the spent sulfuric acid with sulfur dioxide in an extraction zone, wherein at least a portion of the acid soluble oils partitions into the sulfur dioxide;
- recovering an extract fraction comprising the sulfur dioxide and at least a portion of the acid soluble oils from the extraction zone;
- recovering a raffinate fraction comprising the spent sulfuric acid, having a reduced content of acid soluble oils, from the extraction zone;
- separating the extract fraction in a first separation zone to recover a first sulfur dioxide fraction and an acid soluble oils fraction;
- and
- separating the raffinate fraction in a second separation zone to recover a second sulfur dioxide fraction and a sulfuric acid fraction.
6 more elements
Dependencies are inferred from the claim text.