IP Library › Granted Patent US 7,550,065
Granted Patent B2
US 7,550,065 · App. 11/111,572 · Granted Jun 23, 2009

Method for recovering solvents

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Quick Facts
Patent No.
US 7,550,065
App. No.
11/111,572
Granted
Jun 23, 2009
Kind
B2
Abstract

A method for recovering a solvent from its mixture containing oligomers extracted from grafted polyolefins is disclosed. The method includes distilling the solvent from the mixture in the presence of a naphthalene compound. The method of the invention significantly increases the solvent recovering yield without causing the vessel fouling.

Claims (15)

1. A method for recovering a solvent, said method comprising distilling the solvent, in the presence of a naphthalene compound in an amount from about 5 wt % to about 50 wt % of the solvent, from a mixture comprising the solvent and oligomers extracted from a grafted polyolefin.

2. The method of claim 1 wherein the naphthalene compound is an alkylnaphthalene.

3. The method of claim 2 wherein the alkylnaphthalene is selected from the group consisting of 1-methylnaphthalene, 2-methylnaphthalene, 1-ethylnaphthalene, 2-ethylnaphthalene, and mixtures thereof.

4. The method of claim 1 wherein the naphthalene compound is a mixture of naphthalene and methylnaphthalenes.

5. The method of claim 1 wherein the grafted polyolefin is a maleic anhydride-grafted polyolefin.

6. The method of claim 1 wherein the grafted polyolefin is a maleic anhydride-grafted propylene homopolymer.

7. The method of claim 1 wherein the grafted polyolefin is a maleic anhydride-grafted impact polypropylene.

8. The method of claim 1 wherein the solvent is selected from the group consisting of C 5 -C 8 hydrocarbons, C 1 -C 10 oxygen-containing compounds, and mixtures thereof.

9. The method of claim 8 wherein the C 1 -C 10 oxygen-containing compound is selected from the group consisting of alcohols, aliphatic ketones, aliphatic esters, and mixtures thereof.

10. The method of claim 8 wherein the C 5 -C 8 hydrocarbon is selected from the group consisting of hexane, cyclohexane, octane, toluene, xylenes, and mixtures thereof.

11. The method of claim 8 wherein the solvent is an azeotropic mixture of a C 5 -C 8 hydrocarbon and a C 1 -C 10 oxygen-containing compound.

12. The method of claim 11 wherein the solvent is an azeotropic mixture of hexane and ethyl acetate.

13. The method of claim 1 wherein the naphthalene compound is present in an amount from about 5 wt % to about 20 wt % of the solvent.

14. The method of claim 1 which recovers at least 80% of the solvent without causing vessel fouling.

15. The method of claim 1 which recovers at least 90% of the solvent without causing vessel fouling.