Claims
- 1. A method for preparing a tar-depleted smoke colored and smoke flavored tubular casing which comprises (1) thermally decomposing wood in a oxygen-controlled atmosphere to generate smoke-vapors, (2) selectively solvent extracting the tars from the generated smoke vapors with a water immiscible organic solvent, (3) absorbing the tar-extracted smoke vapors into an aqueous medium to provide a tar-depleted liquid smoke solution, and (4) contacting a tubular casing wall with the tar-depleted liquid smoke solution.
- 2. The method of claim 1 wherein the tar-depleted liquid smoke solution is neutralized to a pH greater than about 3.
- 3. The method of claim 1 wherein the tar-depleted liquid smoke solution is neutralized to a pH of between about 3 and about 3.5.
- 4. The method of claim 1 wherein the tar-depleted liquid smoke solution is neutralized to a pH of between about 3 and about 5.
- 5. The method of claim 1 wherein the tar-depleted liquid smoke solution has a light transmittance greater than about 50 percent.
- 6. The method of claim 1 wherein the tar-depleted liquid smoke solution has a light transmittance greater than about 80%.
- 7. The method of claim 1 wherein the tar-depleted liquid smoke solution has a light transmittance greater than about 90%.
- 8. The method of claim 1 wherein the tar-depleted liquid smoke solution has a light transmittance of about 96%.
- 9. The method of claim 1 wherein the tar-depleted liquid smoke solution has a phenol content less than about 10 percent of the carbonyl content.
- 10. The method of claim 1 wherein the tar-depleted liquid smoke solution has a phenol content of less than 2 percent of the carbonyl content.
- 11. The method of claim 1 wherein the tar-depleted liquid smoke solution has a phenol content of about 1.5 percent of the carbonyl content.
- 12. The method of claim 1 wherein the tar-depleted liquid smoke solution is further concentrated.
- 13. The method of claim 12 wherein the tar-depleted liquid smoke is neutralized to a pH greater than about 3.
- 14. A method for preparing a tar-depleted smoke colored and smoke flavored tubular casing which comprises (1) thermally decomposing wood in an oxygen-controlled atmosphere to generate smoke-vapors, (2) contacting the smoke vapors, water, and an organic solvent immiscible in water and having a solubility parameter greater than about 2.7, to form a tar-containing liquid solvent phase and an aqueous liquid smoke phase, (3) separating the liquid smoke phase from the liquid solvent phase to provide a tar-depleted liquid smoke solution, and (4) contacting a tubular casing wall with the tar-depleted liquid smoke solution.
- 15. The method of claim 14 wherein the smoke vapors are contacted with water and a solvent in a single contacting zone.
- 16. The method of claim 14 wherein the smoke vapors are contacted with a solvent in a first contacting zone and thereafter contacted with water in a second contacting zone.
- 17. The method of claim 14 wherein the temperature of the organic solvent phase in step (2) is about 40.degree. C.
- 18. The method of claim 14 wherein the tar-depleted liquid smoke solution is further concentrated.
- 19. The method of claim 14 wherein the tar-depleted liquid smoke is neutralized to a pH greater than about 3.
Parent Case Info
This application is a continuation-in-part of application Ser. No. 483,295, filed Apr. 8, 1983, now abandoned.
US Referenced Citations (8)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
483295 |
Apr 1983 |
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