Method for purifying dioctyl phthalate

Patent metadata

Field	Value
Publication number	US-9718758-B2
Application number	US-201414892728-A
Country	US
Kind code	B2
Filing date	Jun 4, 2014
Priority date	Jun 7, 2013
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

Disclosed is a method of reducing the ultraviolet-light absorbing properties of a composition comprising dioctyl phthalate, the method comprising (a) obtaining a composition comprising dioctyl phthalate and phthalide, wherein said composition has an absorbance of greater than 0.1 at a wavelength of about from 230 to 360 nm, (b) contacting the composition with activated carbon, silica gel, or diatomaceous earth, for a sufficient amount of time to allow the phthalide to contact the activated carbon, silica gel, or diatomaceous earth, and (c) removing the composition from the activated carbon, silica gel, or diatomaceous earth, wherein the composition obtained from step (c) has an absorbance equal to or less than about 0.1 at a wavelength of about from 230 to 360 nm and has a reduced amount of phthalide when compared with the composition from step (a).

First claim

The invention claimed is:

1. A method of reducing the ultraviolet-light absorbing properties of a composition comprising dioctyl phthalate, the method comprising:
(a) obtaining a composition comprising dioctyl phthalate and phthalide, wherein said composition has an absorbance of greater than 0.1 at a wavelength of about from 230 to 360 nm;
(b) contacting the composition with an activated carbon or a silica containing material for a sufficient amount of time to allow the phthalide to contact the activated carbon or the silica containing material; and
(c) removing the composition from the activated carbon or the silica containing material,
wherein the composition obtained from step (c) has an absorbance equal to or less than about 0.1 at a wavelength of about from 230 to 360 nm, and has a reduced amount of phthalide when compared with the composition from step (a),
wherein the activated carbon, when present, has an average particle size of 0.15 to 130 millimeters, and
wherein the silica containing material, when present, is a diatomaceous earth comprising at least about 85 weight percent silica, a silica gel, or a combination thereof.

2. The method of claim 1 , wherein the composition from step (a) has an absorbance greater than 0.1 at a wavelength of about 230 nm and the composition obtained from step (c) has an absorbance equal to or less than about 0.1 at a wavelength of about 230 nm.

3. The method of claim 2 , wherein the composition from step (a) has an absorbance of from about 0.35 to about 0.40 at a wavelength of 230 nanometers.

4. The method of claim 1 , wherein the absorbance of the composition from step (a) at a wavelength of about 230 nm is reduced by a factor of at least 1 after performing the contacting step (b) and the removing step (c).

5. The method of claim 1 , wherein at least 50% of the phthalide is removed from the composition from step (a) after performing the contacting step (b) and the removing step (c).

6. The method of claim 5 , wherein at least 90% of the phthalide is removed from the composition from step (a) after performing the contacting step (b) and the removing step (c).

7. The method of claim 1 , wherein steps (b) and (c) are chromatography steps.

8. The method of claim 1 , comprising isolating or purifying or extracting dioctyl phthalate from the composition obtained from step (c) by the addition of an anti-solvent.

9. The method of claim 8 , wherein the anti-solvent is water.

10. The method of claim 1 , wherein no further processing steps are performed after step (c) to remove phthalide from the composition.

11. The method of claim 1 , wherein the composition is contacted with activated carbon.

12. The method of claim 1 , wherein the composition is contacted with the silica containing material.

13. The method of claim 1 , comprising combining the composition obtained from step (c) as a plasticizer to a composition for the manufacture of an article of manufacture.

14. The method of claim 13 , wherein the article of manufacture is a container or tubing or medical device.

15. The method of claim 1 , wherein the composition obtained from step (c) meets international ISO standard 3826-1:2003(E).

16. The method of claim 1 , wherein the composition from step (a) comprises at least 100 parts per million of phthalide.

17. The method of claim 1 , wherein the composition from step (a) comprises 100 to 600 parts per million by weight of phthalide.

18. The method of claim 17 , wherein the composition from step (a) comprises 300 to 600 parts per million of phthalide.

19. A method of reducing an amount of phthalide in a composition comprising dioctyl phthalate, the method comprising:
(a) obtaining a composition comprising dioctyl phthalate and phthalide;
(b) contacting the composition with activated carbon or a silica containing material for a sufficient amount of time to allow the phthalide to contact the activated carbon or the silica containing material; and
(c) removing the composition from the activated carbon or the silica containing material,
wherein the composition obtained from step (c) has a reduced amount of phthalide when compared with the composition from step (a)
wherein the activated carbon, when present, has an average particle size of 0.15 to 130 millimeters, and
wherein the silica containing material, when present, is a diatomaceous earth comprising at least about 85 weight percent silica, a silica gel, or a combination thereof.

20. The method of claim 19 , wherein at least 50% of the phthalide is removed from the composition from step (a) after performing the contacting step (b) and the removing step (c).

21. The method of claim 20 , wherein at least 90% of the phthalide is removed from the composition from step (a) after performing the contacting step (b) and the removing step (c).

22. The method of claim 19 , wherein the composition from step (a) comprises at least 100 parts per million of phthalide.

23. The method of claim 19 , wherein the composition from step (a) comprises 100 to 600 parts per million of phthalide.

24. The method of claim 23 , wherein the composition from step (a) comprises 300 to 600 parts per million of phthalide.

25. A method of making a plasticizer that meets international ISO standard 3826-1:2003(E), the method comprising:
(a) obtaining a composition comprising dioctyl phthalate and phthalide;
(b) contacting the composition with activated carbon or a silica containing material for a sufficient amount of time to allow the phthalide to contact the activated carbon or the silica containing material; and
(c) removing the composition from the activated carbon or the silica containing material to obtain the plasticizer,
wherein the plasticizer obtained from step (c) meets international ISO standard 3826-1 :2003 (E),
wherein the activated carbon, when present, has an average particle size of 0.15 to 130 millimeters, and
wherein the silica containing material, when present, is a diatomaceous earth comprising at least about 85 weight percent silica, a silica gel, or a combination thereof.

26. The method of claim 25 , wherein the plasticizer obtained from step (c) has a reduced amount of phthalide when compared with the composition from step (a).

27. The method of claim 25 , wherein the plasticizer obtained from step (c) has an absorbance equal to or less than about 0.1 at a wavelength of about from 230 to 360 nm.

28. The method of claim 27 , wherein the plasticizer obtained from step (c) has an absorbance equal to or less than about 0.1 at a wavelength of about 230.

29. The method of claim 25 , wherein at least 50% of the phthalide is removed from the composition from step (a) after performing the contacting step (b) and the removing step (c).

30. The method of claim 29 , wherein at least 90% of the phthalide is removed from the composition from step (a) after performing the contacting step (b) and the removing step (c).

31. The method of claim 25 , wherein the composition from step (a) comprises at least 100 parts per million of phthalide.

32. The method of claim 25 , wherein the composition from step (a) comprises 100 to 600 parts per million of phthalide.

33. The method of claim 32 , wherein the composition from step (a) comprises 300 to 600 parts of phthalide.

Assignees

• Sabic Basic Ind Corp
• Saudi Basic Ind Corp

Inventors

• Bashir Mubarik Ali
• Rafi Mohammad
• Osei-Twun Emmanuel

Classifications

• C07C67/56 Primary

  by solid-liquid treatment; by chemisorption · CPC title

• C08K5/12

  of cyclic polycarboxylic acids · CPC title

• C07C69/80

  Phthalic acid esters · CPC title