Stripping method

Patent metadata

Field	Value
Publication number	US-10081583-B2
Application number	US-201515531012-A
Country	US
Kind code	B2
Filing date	Dec 7, 2015
Priority date	Dec 18, 2014
Publication date	Sep 25, 2018
Grant date	Sep 25, 2018

Abstract

The present invention relates to a stripping method capable of recovering, by an environmentally friendly method, a high-purity ester-based compound without concern over the oxidation of an ester-based compound from a mixture containing the ester-based compound. The stripping method has advantages of generating no wastewater, enabling equipment costs to be reduced by simplifying the process, removing concern over the oxidation of an ester-based compound during the process, and enabling the reuse of the components recovered in the process.

First claim

The invention claimed is:

1. A stripping method comprising:
supplying a mixture including a cyclohexane dicarboxylic acid ester-based compound, which is obtained by hydrogenating a phthalate-based compound, to an upper part of a column;
supplying an inert gas to a lower part of the column;
contacting the mixture with an inert gas under a relative pressure of −1.0 to −0.5 barg to remove a volatile component from the mixture, thereby obtaining the cyclohexane dicarboxylic acid ester-based compound; and
supplying the volatile component recovered by contacting the mixture with the inert gas to a synthesis process or a subsequent treatment process of the ester-based compound,
wherein a steam is not supplied to the column.

2. The stripping method of claim 1 , wherein:
the mixture includes 1,000 ppm or more of alcohol.

3. The stripping method of claim 1 , further comprising:
circulating the inert gas recovered after contacting the mixture with the inert gas, and then contacting the recovered inert gas with a new mixture.

4. The stripping method of claim 1 , wherein:
the mixture is contacted with the inert gas at a temperature ranging from 120 to 250° C.

5. The stripping method of claim 4 , wherein:
the mixture is heated to 120 to 250° C., the inert gas is heated to 120 to 250° C., and then the heated mixture is contacted with the heated inert gas.

6. The stripping method of claim 1 , wherein:
a weight ratio of the mixture and the inert gas is 5 to 30:1.

7. The stripping method of claim 1 , wherein:
a volatile component including 500 ppm or less of moisture is recovered as the volatile component.

8. The stripping method of claim 1 , wherein:
2-ethylhexanol is recovered as the volatile component.

Assignees

• Hanwha Chemical Corp

Inventors

• Jung Ki Taeg
• Kim Hyo Suk
• Kim Young Jo
• Yoon Kyong Jun
• Han Kee Do

Classifications

• C07C31/125

  containing five to twenty-two carbon atoms · CPC title

• C07C69/75

  of acids with a six-membered ring · CPC title

• C07C67/48 Primary

  Separation; Purification; Stabilisation; Use of additives · CPC title

• C07C67/54

  by distillation · CPC title

• C07C2601/14

  The ring being saturated · CPC title