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P-benzoquinone condensation crystallization technology

A technology for condensation crystallization and p-benzoquinone, applied in the field of p-benzoquinone condensation and crystallization process, can solve the problems of inability to continuously perform solid-liquid separation, easy crystallization and blockage of descending pipes, low stripping production efficiency, etc. Product purity, yield enhancement effect

Active Publication Date: 2014-01-08
XIANTAO CITY KANGHUA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a p-benzoquinone condensation crystallization process to improve the existing technical problems such as unreasonable equipment structure, easy crystallization and blockage of downcomers, and low stripping production efficiency.
The invention also solves the problem that the solid-liquid separation after p-benzoquinone condensation and crystallization cannot be carried out continuously

Method used

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  • P-benzoquinone condensation crystallization technology

Examples

Experimental program
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Effect test

Embodiment approach 1

[0026] Embodiment 1: When opening the Venturi tube feed valve 27 and closing the cyclone separator control valves 271, 272, the water vapor containing gas phase quinone at the top of the stripping tower is sucked by the negative pressure of the Venturi tube 6 Next, pass hot water into the condenser 5 through the condenser 5 near the top of the stripping tower to lower the temperature of the water vapor to 80-100°C. The water vapor passing through the condenser 5 is sent into the crystallization kettle 1 through the Venturi tube 6 and the downcomer 61, and ice water is introduced into the jacket layer 10 of the crystallization kettle 1 to reduce the temperature in the crystallization kettle 1 to 0-20 ℃, the crystallization tank 1 is stirred by the paddle stirring blade 24, the cooling water is circulated and quenched, etc., so that p-benzoquinone is precipitated in the form of crystals, and the crystallization mixture generated in the crystallization tank 1 is formed. The low-con...

Embodiment approach 2

[0027] Embodiment 2: When closing the Venturi tube feed valve 27 and opening the cyclone separator control valves 271, 272, the water vapor containing gas phase quinone at the top of the stripping tower is sucked by the negative pressure of the Venturi tube 6 Next, pass hot water into the condenser 5 through the condenser 5 near the top of the stripping tower to lower the temperature of the water vapor to 80-100°C. The water vapor passing through the condenser 5 is sent into the crystallization kettle 1 through the Venturi tube 6 and the downcomer 61, and ice water is introduced into the jacket layer 10 of the crystallization kettle 1 to reduce the temperature in the crystallization kettle 1 to 0-20 ℃, the crystallization tank 1 is stirred by the paddle stirring blade 24, the cooling water is circulated and quenched, etc., so that p-benzoquinone is precipitated in the form of crystals, and the crystallization mixture generated in the crystallization tank 1 is formed. The cryst...

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Abstract

The invention discloses a p-benzoquinone condensation crystallization technology. The p-benzoquinone condensation crystallization technology comprises the following steps of 1, feeding p-benzoquinone crystal-containing steam in a stripping tower into a crystallization reactor by a tower top condenser and a Venturi tube, and carrying out crystallization, and 2, feeding a crystallization mixed liquid into the Venturi tube by a circulating pump so that the crystallization mixed liquid is mixed with the p-benzoquinone crystal-containing steam, and carrying out re-crystallization, or 3, selectively feeding the crystallization mixed liquid into a cyclone separator and a horizontal centrifuge and carrying out separation of a p-benzoquinone mother liquor and crystals. The Venturi tube has a negative pressure suction effect, prevents aggregation of non-condensable gas on the tower top, reduces a temperature of the stripping tower top, avoids p-benzoquinone self-aggregation coking and improves product purity. The crystallization mixed liquid ceaselessly washes a down-flow tube so that obstruction caused by crystals bonding to the wall of the down-flow tube is avoided. The p-benzoquinone crystal-containing steam and the crystallization mixed liquid are subjected to mixing and cooling so that a crystal color is brilliant yellow and crystal quality is improved.

Description

technical field [0001] The invention relates to a method for stripping chemical raw materials, in particular to a p-benzoquinone condensation crystallization process. Background technique [0002] Benzoquinone is a kind of quinone. Molecular formula C6H4O2, there are two kinds of o-benzoquinone and p-benzoquinone. P-benzoquinone is more important and can be used as dye and pharmaceutical intermediate, rubber anti-aging agent, polymerization inhibitor, antioxidant, developer, etc. [0003] The traditional production method of p-benzoquinone is the oxidation method, and the finished product of p-benzoquinone is prepared by stripping aniline oxidation solution with atmospheric pressure steam. The existing p-benzoquinone is extracted by high-temperature water steam stripping, and the temperature is as high as 100-110°C, but p-benzoquinone is unstable at high temperature and will be further oxidized into maleic anhydride impurities or self-coagulated coke, which reduces the yie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C50/04C07C46/10B01D9/02
CPCB01D9/0013C07C46/10C07C50/04
Inventor 潘德华
Owner XIANTAO CITY KANGHUA TECH
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