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Apparatus and method of separating and purifying water solution of phenol, catechol, hydroquinone and tar

A hydroquinone and aqueous solution technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as difficult transportation and separation, easy carbonization or puffing, poor fluidity, etc., to ensure high purity And the effects of high yield, low risk of material heat sensitivity, and low concentration of phenolic water

Inactive Publication Date: 2007-10-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the tar component is a mixture system with a high viscosity and a freezing point above 180°C, its presence will aggravate the heat sensitivity of o- and hydroquinone, which will bring great difficulties to the transportation and separation of materials, and the tar The longer it stays at high temperature, the higher the viscosity, the worse the fluidity, and it is easy to carbonize or expand, which makes the operation impossible

Method used

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  • Apparatus and method of separating and purifying water solution of phenol, catechol, hydroquinone and tar
  • Apparatus and method of separating and purifying water solution of phenol, catechol, hydroquinone and tar
  • Apparatus and method of separating and purifying water solution of phenol, catechol, hydroquinone and tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]The raw material liquid is passed into the dehydration distillation tower with the flow rate of 4200kg / h, and the raw material liquid is composed of 20% water, 68% phenol, 3% catechol, 5% hydroquinone and 4% tar, and the waste water containing phenol is obtained from The top of the dehydration distillation tower is discharged, and the raw material liquid is sent into the first dephenol distillation tower from the bottom of the tower after dehydration, and the operating pressures in the dehydration distillation tower and the first dephenol distillation tower are respectively 50kPa and 10kPa; The pressure difference from the bottom of the tower is 1kPa and 2kPa respectively, and the temperature in the tower is 80-150°C; phenol is distilled from the upper part of the first dephenolization distillation tower, and the liquid after one separation of phenol is from the bottom of the first dephenolization distillation tower Send it into the second dephenolization distillation tow...

Embodiment 2

[0030] The raw material liquid is passed into the dehydration distillation tower with a flow rate of 20000kg / h. The raw material liquid consists of 50% water, 30% phenol, 9% pyrocatechol, 9% hydroquinone and 2% tar, and the phenolic waste water is obtained from The top of the dehydration distillation tower is discharged, and the raw material liquid after dehydration is sent into the first dephenol distillation tower from the bottom of the tower, and the operating pressures in the dehydration distillation tower and the first dephenol distillation tower are respectively 20kPa and 12kPa; The pressure difference from the bottom of the tower is 1.5kPa and 2.5kPa respectively, and the temperature in the tower is 65-140°C; phenol is distilled from the upper part of the first dephenolization distillation tower, and the liquid after one separation of phenol is distilled from the first dephenolization distillation tower. The bottom of the tower is sent to the second dephenolization disti...

Embodiment 3

[0032] The raw material liquid is passed into the dehydration distillation tower with a flow rate of 10500kg / h. The raw material liquid consists of 70% water, 20% phenol, 6% pyrocatechol, 3% hydroquinone and 1% tar, and the phenolic waste water is obtained from The top of the dehydration distillation tower is discharged, and the raw material liquid is sent into the first dephenol distillation tower from the bottom of the tower after dehydration, and the operating pressures in the dehydration distillation tower and the first dephenol distillation tower are respectively 35kPa and 11kPa; The pressure difference from the bottom of the tower is 2kPa and 3kPa respectively, and the temperature in the tower is 75-145°C; phenol is distilled from the upper part of the first dephenolization distillation tower, and the liquid after one separation of phenol is from the bottom of the first dephenolization distillation tower Send into the second dephenolization distillation tower with 2100kg / ...

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Abstract

The present invention discloses the apparatus and method of separating and purifying phenol, catechol, hydroquinone and tar in water solution. The apparatus includes a dewatering distillation tower with entry end, a first phenol eliminating distillation tower, a second phenol eliminating distillation tower, a tar eliminating distillation tower, a deep distilling caldron, and a product distillation tower. The separating process includes the following steps: feeding the materials successively into the apparatus for rectification separating, and exhausting catechol and p-benzenediol separately in the top and the bottom of the product distillation tower. Owing to the continuous five tower vacuum distillation and high efficiency packing tower technology, the present invention has the features of low phenol content, low operation temperature, etc.

Description

technical field [0001] The invention relates to a separation and purification device for phenol, o / hydroquinone and tar aqueous solution, and also relates to a separation and purification method for phenol, o / hydroquinone and tar aqueous solution. Background technique [0002] Since the 1960s and 1970s, my country has started the development and research of the new production process of dihydric phenols. The relevant state departments have listed this project as a scientific and technological breakthrough in the "7.5", "8.5", and "9.5" project, the reaction process is becoming more and more mature, but because the separation of the solution after the reaction and the product purification technology are not up to standard, industrial production has not yet been formed. Domestic reports on the separation and purification technology of o- and hydroquinone are also limited to the test or small test stage. [0003] For the separation and purification technologies of similar pheno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C37/74C07C39/04C07C39/08
Inventor 冯惠生宋海华王强
Owner TIANJIN UNIV
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