Process for improving the separation of oil/water mixtures
Disclosed is a process for the reduction of the electrical conductivity of a product mixture containing the oil and water phases resulting from the conversion of biomass to liquid products, including the at least partial breaking of any oil/water emulsion, which aids in the separation of the oil and water phases.
1. A method comprising:
a) providing a first mixture in the form of a first emulsion of biomass derived carbon containing compounds and water;
b) adding a quantity of a conductivity modifier to said first mixture thereby forming a second mixture in the form of a second emulsion of said biomass derived carbon containing compounds and said water and said conductivity modifier, and wherein said quantity of said conductivity modifier is sufficient such that the electrical conductivity of said second mixture is lower than the electrical conductivity of said first mixture; and
c) subjecting said second mixture to electrostatic dehydration, resulting in at least a partial breaking of said second emulsion, and freeing and separating from said second emulsion at least 75% of said biomass derived carbon containing compounds contained in said second emulsion.
2. The method of claim 1 wherein said first mixture is produced from the catalytic conversion of biomass at elevated temperatures.
3. The method of claim 1 wherein said first mixture has a Total Acid Number greater than 0, and wherein said conductivity modifier has a Total Acid Number less than the Total Acid Number of said first mixture.
4. The method of claim 1 wherein said first mixture has a Total Acid Number of at least about 2.
5. The method of claim 1 wherein said first mixture has a Total Acid Number of at least about 3.
6. The method of claim 1 wherein said first mixture has a Total Acid Number of at least about 10.
7. The method of claim 1 wherein the Total Acid Number of said conductivity modifier is at least about 2 units lower than the Total Acid Number of said first mixture.
8. The method of claim 1 wherein the electrical conductivity of said second mixture is less than about 75% of the electrical conductivity of said first mixture.
9. The method of claim 1 wherein the electrical conductivity of said second mixture is less than about 50% of the electrical conductivity of said first mixture.
10. The method of claim 1 wherein the electrical conductivity of said second mixture is less than about 25% of the electrical conductivity of said first mixture.
11. The method of claim 1 wherein said conductivity modifier is selected from the group consisting of an aqueous solution, a fraction separated from said biomass derived carbon containing compounds, a fraction separated from said biomass derived carbon containing compounds following hydrotreatment of said biomass derived carbon containing compounds, and combinations thereof.
12. The method of claim 11 wherein said conductivity modifier comprises an aqueous solution having a pH greater than 7.
13. The method of claim 12 wherein said aqueous solution comprises a base selected from the group consisting of NaOH, KOH, NH 4 OH, alkyl amines, pyridines, quinolines, ammonia, ammonium compounds including: nitrates, sulfides, carbonates, hydroxides, acetates, chlorides, bromides, iodides, and sulfates, and combinations thereof.
14. The method of claim 13 wherein said base is selected from the group consisting of ammonium bicarbonate, ammonium hydroxide or combinations thereof.
15. The method of claim 11 wherein said conductivity modifier comprises an aqueous solution having a pH greater than about 9.
16. The method of claim 1 wherein at least 90% of said biomass derived carbon containing compounds contained in said second emulsion are freed and separated from said second emulsion in step c).
17. The method of claim 1 wherein at least 95% of said biomass derived carbon containing compounds contained in said second emulsion are freed and separated from said second emulsion in step c).
18. The method of claim 1 wherein at least 50% of said water contained in said second emulsion is freed from said second emulsion in step c).
19. The method of claim 1 wherein at least 70% of said water contained in said second emulsion is freed from said second emulsion in step c).
20. The method of claim 1 wherein at least 95% of said water contained in said second emulsion is freed from said second emulsion in step c).
21. The method of claim 1 wherein said electrostatic dehydration is performed in a desalter vessel.
22. The method of claim 1 wherein a demulsifier compound is added to said first mixture, along with said conductivity modifier, thereby forming said second mixture which is then subjected to said electrostatic dehydration.
23. The method of claim 22 wherein said demulsifier is an alkoxylate derived from a poly amine.