Method for processing and recycling production wastewater of fluorescent brightener CBS

A fluorescent whitening agent and waste water production technology, applied in heating water/sewage treatment, chemical instruments and methods, preparation of organic compounds, etc., can solve problems such as decline in treatment effect, large increase in waste water volume, consumption of water resources, etc., to achieve The effect of low processing cost, excellent effect and simple process flow

Active Publication Date: 2013-10-02
山西晋光化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the application limitation of biochemical method is that it is only suitable for wastewater treatment with a salt content below 5000mg / L; when the salt content is higher than 5000mg / L, the treatment effect will be significantly reduced, the reason is that the high concentration of salt in wastewater will inhibit conventional biochemical treatment Microbial activity in the method
The salt content of CBS wastewater is about several times higher than 5000mg / L. If the biochemical method is used, it must be diluted with water to reduce the salt content before treatment. However, the disadvantage of this method is that it will consume water resources and increase the amount of wastewater. increase

Method used

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  • Method for processing and recycling production wastewater of fluorescent brightener CBS
  • Method for processing and recycling production wastewater of fluorescent brightener CBS

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Test 1: Take 5000 grams of normal batch of CBS production wastewater, put it in a four-necked flask, and use atmospheric pressure distillation to collect fractions during the distillation process. After the distillation, 4875 grams of fractions and 125 grams of salt residue are obtained.

[0026] Put the salt slag into a 1000ml four-neck flask, add 500 grams of by-product methanol from the CBS production distillation section, stir for 30 minutes to completely disperse the salt slag in the methanol, filter through a Buchner funnel to obtain 110 grams of refined salt and 515 grams of waste methanol gram. Waste methanol was rectified to obtain 480 grams of methanol and 35 grams of organic residue.

[0027] The methanol obtained by rectification is detected by gas chromatography, and the content is 99.2%.

[0028] Experiment 2: The distillate and refined salt recovered from Experiment 1 were used in the synthesis of CBS in the laboratory, and the obtained CBS product was 1...

Embodiment 2

[0034] Using the MVR system (configured with the steam compressor produced by the American Tessel Corporation and the forced circulation evaporation crystallizer), 2000 kg of CBS production wastewater is distilled, 1950 kg of distillate is recovered, and the remaining salt residue in the evaporator is 50 kg.

[0035] Add 200 kg of by-product methanol recovered from the CBS production distillation section to a 1 cubic enamel kettle, start stirring, then put 50 kg of salt slag into the kettle, stir for 30 minutes to fully disperse the salt slag in the methanol, and press filter to obtain 44 kg of refined salt, 206 kg of waste methanol, 192 kg of methanol and 14 kg of organic residue after rectification of waste methanol.

[0036] The methanol obtained by rectification is detected by gas chromatography, and the content is 99.3%.

[0037] Using the MVR system to treat wastewater, the power consumption cost is about 45 yuan / ton.

Embodiment 3

[0039] 2000 kg of CBS wastewater was treated by atmospheric distillation, and other operations were the same as in Example 2. Atmospheric distillation treats wastewater, and the power consumption cost is about 300 yuan / ton.

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Abstract

The invention relates to a method for processing and recycling production wastewater of a fluorescent brightener CBS, belonging to the technical field of production of the fluorescent brighteners, which comprises the following steps of: processing production wastewater of the CBS by a distillation manner, and recycling fraction and salt slag, wherein the fraction is directly used for a refining process of the production of the CBS, the salt slag is purified by methyl alcohol which is a byproduct of the production of the CBS, and is subjected to solid-liquid separation to obtain refined salt, and the refined salt is directly used for a salting-out process of the production of the CBS. According to the invention, the problem that the production wastewater of the CBS is difficultly processed can be solved, so that the wastewater zero emission of the production of the CBS is realized; the processing method is green and environment-friendly; simultaneously, the methyl alcohol which is the byproduct of the production of the CBS is reasonably utilized, and the salt slag is effectively processed and utilized, so that the raw and auxiliary materials can be recycled; and further, the process is optimized, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of fluorescent whitening agent production, and relates to a method for treating wastewater produced by fluorescent whitening agent CBS and a method for resource recycling. Background technique [0002] Fluorescent whitening agent CBS is a kind of fluorescent whitening agent with excellent performance. It has good resistance to chlorine bleaching, acid and alkali, and sunlight. It is mainly used in washing powder, washing cream, soap, soap and liquid detergent. , It plays the role of whitening, brightening and brightening, and is one of the best fluorescent whitening agents in the detergent industry. [0003] At present, most of the production of CBS adopts the following process route: 1) Condensation reaction: 4, 4'-diethyl diphosphate biphenyl (English abbreviation: BPMB), sodium benzaldehyde o-sulfonate, methanol -Sodium methoxide solution as raw material, with N,N-dimethylformamide (DMF) or dimethyl sulf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/04C07C31/04C07C29/80
Inventor 季东峰李伟王杰吕狮威
Owner 山西晋光化工有限公司
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