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Equipment and method for separating indole and biphenyl from wash oil fraction

A technology of indole and biphenyl, applied in the field of chemical engineering, can solve the problems of increased separation cost, complicated separation method and the like

Active Publication Date: 2012-08-22
BAOSHUN TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses a crystallization process, which makes the separation method complicated and increases the separation cost

Method used

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  • Equipment and method for separating indole and biphenyl from wash oil fraction
  • Equipment and method for separating indole and biphenyl from wash oil fraction
  • Equipment and method for separating indole and biphenyl from wash oil fraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] like figure 1 As shown, the equipment for separating indole and biphenyl from the wash oil fraction includes an azeotropic rectification tower 1, a heat exchanger 2 and a flash tank 3; the azeotropic rectification tower is a plate tower with an azeotropic Material outlet 1-1, the first plate in the upper part of the tower is provided with an entrainer feeding port 1-2, the middle part of the tower is provided with an indole and biphenyl mixture feeding port 1-3, and the bottom of the tower is provided with an indole outlet Port 1-4, the azeotrope discharge port 1-1 is connected to the flash tank 3 through the heat exchanger 2, and the flash tank 3 is provided with three discharge ports, which are the gas phase water outlet 3-1, biphenyl Product outlet 3-2, entrainer recovery outlet 3-3.

[0014] The plate number of described azeotropic rectification column is 90.

[0015] The method for separating indole and biphenyl from washing oil fractions is to feed the enriched ...

Embodiment 2

[0017] The equipment for separating indole and biphenyl from the wash oil fraction, the number of plates of the azeotropic rectification tower is 87, and others are all the same as in Example 1.

[0018] The method for separating indole and biphenyl from washing oil fractions is to feed the enriched indole and biphenyl raw materials from the indole and biphenyl mixture feed port of the azeotropic rectification tower, and add azeotropic agent feed port from the azeotropic distillation tower. Boiling agent; choose the massfraction of diethylene glycol in the mixture of 25% diethylene glycol (S) and water (W) to be entrainer, add from the entrainer feeding port at the 1st plate place, flow is 638kg / hr; the mixture of indole (A) and biphenyl (B) is added from the mixed feed inlet at the 44th column plate place, wherein the mass fraction of indole is 46.45%, and the mass fraction of biphenyl is 53.55%. It is 134.95kg / hr. The azeotropic distillation column operates under normal pr...

Embodiment 3

[0020] The equipment for separating indole and biphenyl from the wash oil fraction, the number of plates of the azeotropic rectification tower is 91, and others are all the same as in Example 1.

[0021] The method for separating indole and biphenyl from washing oil fractions is to feed the enriched indole and biphenyl raw materials from the indole and biphenyl mixture feed port of the azeotropic rectification tower, and add azeotropic agent feed port from the azeotropic distillation tower. Boiling agent; choose the massfraction of diethylene glycol at the mixture of 28% diethylene glycol (S) and water (W) to be entrainer, add from the entrainer feeding port at the 1st plate place, flow is 638kg / hr; the mixture of indole (A) and biphenyl (B) is added from the feed inlet of the mixed material at the 44th column plate, wherein the mass fraction of indole is 48.25%, and the mass fraction of biphenyl is 53.75%. It is 140.0kg / hr. The azeotropic distillation column operates under ...

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PUM

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Abstract

The invention relates to equipment and a method for separating indole and biphenyl from a wash oil fraction. The equipment for separating the indole and the biphenyl from a wash oil fraction comprises an azeotropic distillation column (1), a heat exchanger (2) and a flash drum (3). The method is characterized in that enriched indole and biphenyl raw materials are led in the azeotropic distillation column from an indole and biphenyl mixture charge hole of the azeotropic distillation column, and an entrainer is added in from an entrainer charge hole; after the entrainer in azeotropic distillation forms an azeotrope system with the biphenyl, the azeotrope is discharged from an azeotrope discharge hole and putti in the flash drum through the heat exchanger; and a liquid phase formed in the flash drum is layered after the azeotrope is flashed by the flash drum, wherein the upper liquid phase is a biphenyl product and is discharged from a biphenyl product outlet, and the lower liquid phase is a water and alcohol mixture, is discharged from an entrainer recovery outlet and is recycled as an entrainer for recycling; a gas phase is a small quantity of biphenyl mixture and discharged from awater outlet, and after the gas phase is mixed with the entrainer, the gas phase enters the azeotropic distillation column once again for recovery; and an indole product is obtained from the bottom of the azeotropic distillation column and discharged from an indole discharge hole.

Description

technical field [0001] The invention belongs to the field of chemical engineering, and relates to equipment and a method for separating indole and biphenyl, in particular to equipment and a method for separating indole and biphenyl from washing oil fractions. Background technique [0002] Biphenyl is an important heat exchange agent in industry, and it is also widely used in organic synthesis. Indole is mainly used in the fragrance industry as a flavor retaining agent, and a small amount of impurities in indole will change the fragrance of indole. Biphenyl and indole are mainly concentrated in the wash oil fraction of coal tar, the mass fraction of biphenyl in the wash oil is about 8%, and the mass fraction of indole in the wash oil is about 2%. Washing oil fraction is the fraction with the widest cutting temperature range in coal tar distillation. The cutting temperature is usually 230-300°C. It is mainly used for washing and absorbing benzene compounds in coal gas. Washi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/34C07D209/06C07D209/08C07C15/14C07C7/04
Inventor 许春建李成杰张新桥吴祥平
Owner BAOSHUN TECH CO LTD