Recovery and separation of chemicals produced during kraft pulping operations
Abstract
Abstract (A) TREATING THE VOLATILE CHEMICAL FRACTION WITH A HOT CAUSTIC SOLUTION TO REMOVE A SULFUR-CONTAINING-CHEMICALS FRACTION FROM SAID VOLATILE CHEMICAL FRACTION, (B) TREATING THE VOLATILE CHEMICAL FRACTION WITH STEAM IN A SECOND FRACTIONATING COLUMN TO GET A MIXTURE OF CHEMICALS, (C) REFLUXING THE MOVE VOLATILE CHEMICALS PRESENT IN SAID MIXTURE TO SEPARATE A SECOND VOLATILE CHEMICAL FRACTION AND A SECOND CRUDE TURPENTINE FRACTION COMPRISING PRIMARILY A-PINENE, AND (D) SEPARATING THE CHEMICALS IN SAID SECOND VOLATILE CHEMICAL FRACTION BY DISTILLATION. CHEMICALS, SUCH AS METHANOL, ETHANOL, ACETONE, DIMETHYL, DISULFIDE, DIMETHYL SULFIDE, METHYL MERCAPTAN, CRUDE TURPENTINE AND HYDROGEN SULFIDE WHICH ARE PRODUCED DURING KRAFT PULPING OPERATIONS ARE RECOVERED BY TREATING LIQUORS CONTAINING SAID CHEMICALS WITH STEAM IN A FRACTIONATING COLUMN. THE CHEMICALS ARE FURTHER SEPARATED BY REFLUXING THE MORE VOLATILE CHEMICALS IN SAID FRACTIONATING COLUMN TO ISOLATE A VOLATILE CHEMICAL FRACTION AND A CRUDE TURPENTINE FRACTION COMPRISING PRIMARILY A-TERPINEOL. THE CHEMICAL PRESENT IN THE VOLATILE CHEMICAL FRACTION CAN THEN BE SEPARATED BY A FOUR-STEP PROCESS WHICH COMPRISES: D R A W I N G
Inventors
- 👤 K Baierl
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |