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Decompression gas stripping process

A technology of stripping and oxidation, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as affecting product yield, achieve the effect of inhibiting oxidative decomposition or coking, and improving yield

Inactive Publication Date: 2007-06-06
湖北开元化工科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] P-benzoquinone (or o-toluidine) and hydroquinone (or o-methyl hydroquinone) are important intermediates in organic synthesis, and aniline (or o-toluidine) oxidation produces p-benzoquinone (or o-methyl p-benzoquinone) and hydroquinone (or o-methyl hydroquinone) traditional method is aniline (or o-methylamine) oxidation solution normal pressure steam stripping p-benzoquinone (or o-methyl hydroquinone) p-benzoquinone), and then reduced to produce hydroquinone (or o-methyl p-benzoquinone), because p-benzoquinone (or o-methyl p-benzoquinone) is unstable at high temperature, it is further oxidized to generate maleic anhydride impurities Or coking, affecting the yield of the product

Method used

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  • Decompression gas stripping process

Examples

Experimental program
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Effect test

Embodiment 1

[0013] Take oxidized material 890g, measure p-benzoquinone content to be 32.2g. Turn on the vacuum pump 5, adjust the system pressure to be 50mmHg, the temperature at the top of the stripping tower 1 is 40°C, the temperature of the straight tube condenser 3 is 20°C, and the temperature of the crystallization tank 4 is 15°C, and the oxidizing material is evenly added dropwise for stripping. After finishing measuring and stripping, the p-benzoquinone content is 32.1g, and the extraction rate is 99.6%.

[0014] Take 890g of the oxidized material, strip it according to the traditional atmospheric pressure stripping method, and measure the amount of p-benzoquinone to be 28.5g, and the extraction rate is 89%.

Embodiment 2

[0016] Take oxidized material 890g, measure p-benzoquinone content to be 32.2g. Turn on the vacuum pump 5, adjust the system pressure to be 100mmHg, the temperature at the top of the stripping tower 1 is 52°C, the temperature of the straight tube condenser 3 is 22°C, and the temperature of the crystallization tank 4 is 17°C, evenly drop the oxidizing material for stripping, stripping After finishing measuring and stripping, the p-benzoquinone content is 32g, and the extraction rate is 99.3%.

[0017] Take 890g of the oxidized material, strip it according to the traditional atmospheric pressure stripping method, and measure the amount of p-benzoquinone to be 28.5g, and the extraction rate is 89%.

Embodiment 3

[0019] Take oxidized material 890g, measure p-benzoquinone content to be 32.2g. Turn on the vacuum pump 5, adjust the system pressure to 200mmHg, the temperature at the top of the stripping tower 1 is 69°C, the temperature of the straight tube condenser 3 is 52°C, and the temperature of the crystallization tank 4 is 22°C, and evenly add the oxidizing material dropwise for stripping. After finishing measuring and stripping, the p-benzoquinone content is 31.8g, and the extraction rate is 98.7%.

[0020] Take 890g of the oxidized material, strip it according to the traditional atmospheric pressure stripping method, and measure the amount of p-benzoquinone to be 28.5g, and the extraction rate is 89%.

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Abstract

The decompression gas stripping process is used for aniline or o-toluamide oxidizing process to produce p-benzoquione, o-methyl-p-benzoquione and quinol or o-methyl quinol in a closed production system in the pressure of 50mmHg-750mmHg, stripping tower top temperature of 40 deg.c-100 deg.c, condenser pipe temperature of 20 deg.c-100 deg.c and crystallizing tank or reducing pot temperature of 15 deg.c-100 deg.c. Compared with conventional process, the present invention has 6-15 % raised product yield.

Description

technical field [0001] The invention relates to a vacuum stripping method for producing p-benzoquinone (or o-methyl-p-benzoquinone) and hydroquinone (or o-methylhydroquinone) by oxidation of aniline (or o-toluidine). Background technique [0002] P-benzoquinone (or o-toluidine) and hydroquinone (or o-methyl hydroquinone) are important intermediates in organic synthesis, and aniline (or o-toluidine) oxidation produces p-benzoquinone (or o-methyl p-benzoquinone) and hydroquinone (or o-methyl hydroquinone) traditional method is aniline (or o-methylamine) oxidation solution normal pressure steam stripping p-benzoquinone (or o-methyl hydroquinone) p-benzoquinone), and then reduced to produce hydroquinone (or o-methyl p-benzoquinone), because p-benzoquinone (or o-methyl p-benzoquinone) is unstable at high temperature, it is further oxidized to generate maleic anhydride impurities Or coking, affecting the yield of the product. The atmospheric pressure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C46/10C07C50/02C07C37/70C07C39/08
Inventor 谢争兵周冶华
Owner 湖北开元化工科技股份有限公司
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