Claims
- 1. A method for improving the separation of water in a tall oil preparation process, the method comprising the steps of:
- neutralizing with carbon dioxide a mixture of tall oil soap and water;
- adjusting the pH of the neutralized mixture by adding to the neutralized mixture an acidically reacting substance, provided that the acidically reacting substance is not sulfuric acid alone; and
- separating the aqueous phase containing bicarbonate from the tall oil soap after the pH adjusting step.
- 2. A method according to claim 1, wherein the acidically reacting substance is bisulfite, sulfur dioxide, hydrochloric acid, nitric acid, or a carboxylic acid.
- 3. A method according to claim 1, wherein the acidically reacting substance is formic acid.
- 4. A method according to claim 1 or 2, wherein the acidically reacting substance is a solution comprising sulfite and bisulfite.
- 5. A method according to claim 1 or 2, wherein the step of adjusting the pH results in the neutralized mixture having a pH of from 7.0 to 8.0.
- 6. A method according to claim 1 or 2, Wherein the step of adjusting the pH results in a lowering of the pH of the neutralized mixture by from 0.2 to 1 pH unit.
- 7. A method for preparing tall oil, comprising the steps of:
- neutralizing with carbon dioxide a mixture of tall oil soap and water;
- adjusting the pH of the neutralized mixture by adding to the neutralized mixture an acidically reacting substance, provided that the acidically reacting substance is not sulfuric acid alone;
- separating the aqueous phase containing bicarbonate from the tall oil soap after the pH adjusting step; and
- cooking the separated tall oil soap with sulfuric acid to form tall oil.
- 8. A method according to claim 7, wherein the acidically reacting substance is bisulfite, sulfur dioxide, hydrochloric acid, nitric acid, or a carboxylic acid.
- 9. A method according to claim 7, wherein the acidically reacting substance is formic acid.
- 10. A method according to claim 7 or 8, wherein the acidically reacting substance is a solution comprising sulfite and bisulfite.
- 11. A method according to claim 7 or 8, wherein the step of adjusting the pH results in the neutralized mixture having a pH of from 7.0 to 8.0.
- 12. A method according to claim 7 or 8, Wherein the step of adjusting the pH results in a lowering of the pH of the neutralized mixture by from 0.2 to 1 pH unit.
Priority Claims (1)
Number |
Date |
Country |
Kind |
952176 |
May 1995 |
FIX |
|
Parent Case Info
This application is a continuation filed under 35 USC 371 of PCT/FI 96/00243 filed May 3,1996
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/FI96/00243 |
5/3/1996 |
|
|
1/26/1998 |
1/26/1998 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO96/34932 |
11/7/1996 |
|
|
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
3901869 |
Bills |
Aug 1975 |
|
5283319 |
Huibers et al. |
Feb 1994 |
|
5286845 |
Huibers et al. |
Feb 1994 |
|
5455328 |
Vuorikari et al. |
Oct 1995 |
|
Foreign Referenced Citations (5)
Number |
Date |
Country |
93868 |
Jun 1992 |
FIX |
98166 |
Feb 1940 |
SEX |
WO9323132 |
Nov 1993 |
WOX |
WO9411571 |
May 1994 |
WOX |
WO9523837 |
Sep 1995 |
WOX |
Non-Patent Literature Citations (2)
Entry |
TkT Raimo Alen, "Sulfaattikeitossa sivutuotteina syntyvien alifaattisten karboksyylihappojen hyodyntaminen", Kemia-Kemi, vol. 15 (1988) 6, pp. 565-569. |
V.C. Uloth et al, "Crude Spent Sulphite Liquor as Soap Acidulation Additives to Improve Efficiency of Tall Oil Production," Pulp & Paper Canada, 85:5 (1984), pp. 69-71. |