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Cis-decahydronaphthalene and trans-decahydronaphthalene separating method

A technology of cis-decalin and decahydronaphthalene, which is applied in the direction of distillation purification/separation, organic chemistry, etc., can solve the problems of difficult separation, increase the number of theoretical plates, increase production cost, etc., and achieve the effect of low energy consumption

Active Publication Date: 2014-11-05
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The boiling points of cis-decalin and trans-decalin are close, and the separation is difficult. The purpose of separation can be achieved by increasing the number of theoretical plates and increasing the reflux ratio, but increasing the number of theoretical plates and increasing the reflux ratio will be extremely difficult. A large increase in energy consumption leads to increased production costs and limits the application of cis-decalin and trans-decalin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In the tower kettle, add 500g of decalin, the mass content of trans-decalin is 58.2%, add 145.5g of ethylenediamine, and rectify on a distillation tower with a theoretical plate number of 15. The pressure of the distillation tower is 0.3atm, the reflux ratio is controlled to 1:1, heating, collecting the distillate, standing, after phase separation, take the upper layer solution and weigh 290.2g, the purity of trans-decalin as determined by gas chromatography is 99.4%, and the bottom ethylenediamine After the steaming, 195.2 g of cis-decalin was obtained in the tower kettle, and the purity of cis-decalin as determined by gas chromatography was 99.2%.

Embodiment 2

[0018] In the tower kettle, add 500g of decalin, the mass content of trans-decalin is 58.2%, add 291.0g of 1,2-propanediamine, and rectify on a rectification tower with a theoretical plate number of 15. The pressure of the tower is 0.5atm, the reflux ratio is controlled to 3:1, heating, collecting the distillation head, standing, after phase separation, take the upper layer solution and weigh 289.5g, the purity of trans-decalin as determined by gas chromatography is 99.0%, and the kettle After the bottom 1,2-propanediamine was evaporated, 196.1 g of cis-decalin was obtained in the tower kettle. The purity of cis-decalin as determined by gas chromatography was 99.3%.

Embodiment 3

[0020] In the tower kettle, add 500g decalin, the mass content of trans-decalin is 58.2%, add 436.5g of 1,3-propanediamine, and rectify on a rectification tower with a theoretical plate number of 15. The pressure of the tower is 0.8atm, the reflux ratio is controlled at 5:1, heating, collecting the distillation head, standing, after phase separation, take the upper layer solution and weigh 286.8g, the purity of trans-decalin as determined by gas chromatography is 99.5%. After the bottom 1,3-propanediamine was evaporated, 194.9 g of cis-decalin was obtained in the tower, and the purity of cis-decalin as determined by gas chromatography was 99.1%.

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PUM

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Abstract

The invention discloses a cis-decahydronaphthalene and trans-decahydronaphthalene separating method, an azeotropic separating method is used, after phase separation of a material collected at tower top, trans-decahydronaphthalene can be obtained, cis-decahydronaphthalene is obtained in a tower kettle, and the method has the characteristics of low equipment investment, low energy consumption, reusable azeotropic agent. The method is used for separation of cis-decahydronaphthalene and trans-decahydronaphthalene compounds.

Description

Technical field [0001] The invention belongs to the technical field of separation of fine chemicals, and relates to a method for separating cis-decalin and trans-decalin. Background technique [0002] Decahydronaphthalene, also known as bicyclo[4.4.0]decane, is the general term for cis-decalin and trans-decalin, and its molecular formula is C 10 H 18 . At room temperature, cis-decalin and trans-decalin cannot undergo configuration conversion, and need to be converted under the action of a catalyst, but only dynamic equilibrium can be achieved. Decahydronaphthalene has a wide range of uses due to its strong dissolving ability. It is mainly used to dissolve ultra-high molecular weight polyethylene; used as a solvent for coatings; used to extract fat and wax; instead of turpentine, it is used in shoe polish and floor wax manufacturing ; Used as fuel; used in the production of nylon; used as a new type of hydrogen storage material; can also be used in the production of liquid crysta...

Claims

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Application Information

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IPC IPC(8): C07C7/06C07C13/50
Inventor 王伟吕剑李春迎王志轩徐强李亚妮张建伟杨建明杜咏梅
Owner XIAN MODERN CHEM RES INST
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