Process for removing organic impurities from sulfuric acid with liquid or supercritical carbon dioxide
OwnerAndrew Sanderson, Sharon Dresseninventors
Life of this patent
Estimating the term…
Abstract
A process for the removal of organic impurities from sulfuric acid utilizing either liquid or super critical carbon dioxide is provided. The process comprises providing a solution of sulfuric acid contaminated with at least one organic compound and subjecting the solution to countercurrent extraction with one of supercritical carbon dioxide and liquid carbon dioxide. Processes for removing organic contaminants from a waste stream generated in the manufacture of trinitrotoluene are also provided.
Claims18
A process for removing organic impurities from sulfuric acid, comprising:
- providing a solution of sulfuric acid contaminated with at least one organic compound;
- and
- subjecting the solution to a countercurrent extraction with supercritical carbon dioxide.
A process for removing organic impurities from sulfuric acid, comprising:
- providing a solution of sulfuric acid contaminated with at least one organic compound;
- and
- subjecting the solution to a countercurrent extraction with liquid carbon dioxide.
A process for purifying contaminated sulfuric acid, comprising:
- providing a solution of sulfuric acid contaminated with at least one organic compound;
- and
- removing the at least one organic compound from the solution by subjecting the solution to a countercurrent extraction with one of supercritical carbon dioxide and liquid carbon dioxide.
A process for removing organic contaminants from a waste stream generated in the manufacture of trinitrotoluene, comprising:
- mixing at least one of toluene and orthonitrotoluene with mixed acids to generate a product stream and a waste stream, wherein the waste stream comprises nitric acid, sulfuric acid and at least one organic contaminant;
- boiling the waste stream to remove the nitric acid therefrom producing a residual stream comprised of sulfuric acid and the at least one organic contaminant;
- and
- subjecting the residual stream to countercurrent extraction with at least one of supercritical carbon dioxide and liquid carbon dioxide to remove the at least one organic contaminant therefrom.
A process for removing organic contaminants from a waste stream generated in the manufacture of trinitrotoluene, comprising:
- mixing at least one of toluene and orthonitrotoluene with mixed acids to generate a product stream and a waste stream, wherein the waste stream comprises nitric acid, sulfuric acid and at least one organic contaminant;
- subjecting the waste stream to countercurrent extraction with at least one of supercritical carbon dioxide and liquid carbon dioxide to remove the at least one organic contaminant therefrom and create a residual acid stream;
- and
- boiling the residual acid stream to remove the nitric acid therefrom.
Dependencies are inferred from the claim text.