Methods and systems for solvent purification
View Patent ↗A method including: (a) contacting lime with an extract including an S 1 solvent carrying a contaminant load to form a lime treated extract; and (b) reducing the contaminant load by removing solids.
1. A solvent extract composition comprising (on a weight basis):
(a) two hundred parts S 1 solvent carry a contaminant load; and
(b) at least one part lime solids.
2. The composition of claim 1 , wherein the lime solids are present as an aqueous slurry.
3. The composition of claim 1 , wherein the contaminant load comprises at least 0.2% by weight of furfurals relative to the solvent.
4. The composition of claim 1 , wherein the contaminant load comprises at least 0.2% by weight of phenolic compound relative to the solvent.
5. The composition of claim 1 , wherein the contaminant load comprises a formate ester of the solvent.
6. The composition of claim 5 , wherein the contaminant load comprises less than 0.01% by weight of the formate ester of the solvent.
7. The composition of claim 1 , wherein the contaminant load comprises an acetate ester of the solvent.
8. The composition of claim 1 , wherein the contaminant load comprises calcium acetate and calcium formate.
9. The composition of claim 1 , wherein the contaminant load comprises one or more impurities selected from the group consisting of a mineral acid, an organic acid, an alkyl chloride, an alkyl acetate, a phenol, an aldehyde, furfural, hydroxymethyl furfural and a tall oil.
10. The composition of claim 9 , wherein the contaminant load comprises a mineral acid, an alkyl acetate, a phenol and furfural.
11. The composition of claim 1 , wherein the S 1 solvent comprises an alcohol.
12. The composition of claim 11 , wherein the composition comprises one or more of an acetate ester and a formate ester of the solvent.
13. The composition of claim 11 , wherein the S 1 solvent is hexanol or 2-ethyl-1-hexanol.
14. The composition of claim 13 , wherein the composition comprises one or more of an acetate ester and a formate ester of the solvent.
15. The composition of claim 1 , wherein the S 1 solvent is selected from the group consisting of an alcohol, a ketone, and an aldehyde having at least 5 carbon atoms, or a combination thereof.
16. The composition of claim 1 , wherein the S 1 solvent is an organic solvent having an aqueous solubility of less than 15% by weight.
17. The composition of claim 1 , wherein the lime solids comprise at least 35% by weight recycled lime.
18. The composition of claim 2 , wherein the aqueous slurry comprises greater than 2% lime by weight.