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Method for extracting phenazine from RT base production waste

A technology of base and phenazine, which is applied in the field of extracting useful substances, can solve problems such as waste, achieve high production efficiency, reduce production costs, and increase industrial utilization value

Inactive Publication Date: 2011-06-01
TAISHAN MEDICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the consideration of production cost and other reasons, in the existing production process of the enterprise, the remaining organic mixture is not further processed but discharged as waste. In order to prevent environmental pollution, the burning method is often used to burn it, resulting in a lot of waste

Method used

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  • Method for extracting phenazine from RT base production waste

Examples

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Embodiment 1

[0019] Add a certain amount of ethanol into the dissolving tank, weigh 1kg RT base waste and add it to the filter cloth of the dissolving extraction tank, first immerse in ethanol for dissolving and extracting for 20 minutes, then raise the filter cloth above the liquid surface, and spray with 2000ml ethanol Rinse the solid insolubles, and centrifugally filter the extracted solid phase before entering the crude phenazine storage tank.

[0020] Add the crude phenazine to the heating kettle of the heating reflux device, add ethanol in a ratio of 1:6 to 1:7 (g:ml) through a meter, heat to 80°C, dissolve and reflux for 0.5 to 1.0 hours, and dissolve the phenazine dissolve. Then filter the solution while it is hot to remove insoluble impurities, put the filtrate into a crystallization tank and slowly cool down to crystallize for 1 to 2 hours, and obtain needle-shaped crystal phenazine, which is separated by centrifugal filtration, and the filter cake is dried in a drying oven, and ...

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Abstract

The invention relates to a method for extracting phenazine from RT base production waste, which sequentially comprises the processes of dissolution and extraction, solid-liquid separation, recrystallization, drying, distillation and rectification. By utilizing the property that the phenazine can not be dissolved in ethanol at normal temperature, other organic impurities in the RT base waste are dissolved and extracted in an ethanol solution to achieve the purpose of solid-liquid separation; and then, the crude product of the phenazine is recrystallized to obtain the phenazine with higher purity; and the ethanol solvent is recovered and recycled by a distillation method, thereby achieving the purpose of effective extraction of the phenazine. The extraction process can achieve partial continuation, has simple and convenient operation and belongs to waste utilization; the extraction process not only solves the problem of environmental pollution, but also can recover valuable phenazine; the production efficiency is high, and the separation effect is good; the recovery rate of the phenazine in the waste reaches more than 97 percent, and the recovery utilization rate of the ethanol solvent can reach 95 percent.

Description

technical field [0001] The invention relates to a method for extracting useful substances from industrial waste produced by chemical products, in particular to a method for extracting phenazine from waste produced by RT base. technical background [0002] In the process of producing 4-aminodiphenylamine (trade name: RT base) with nitrobenzene and aniline as raw materials, the by-product phenazine is produced, which is coupled with the product 4-aminodiphenylamine, raw material aniline, alkali catalyst, and by-products. Azobenzene and the hydrogenated solvent form a mixture. For the separation method of the mixture, methods such as extraction, concentration, evaporation, and continuous distillation are generally used for effective separation at present. First, the mixture is subjected to continuous extraction treatment, the hydrogenation solvent and the alkali catalyst are fully extracted into the water phase and separated from the organic phase containing 4-aminodiphenylami...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D241/46C07C211/55
Inventor 杨荣华
Owner TAISHAN MEDICAL UNIV
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