Salicylic acid is a fat-soluble organic acid, also called o-hydroxybenzoic acid. In the process of producing salicylic acid, a large amount of phenolic wastewater will be produced at the same time. These phenolic wastewaters are very harmful, not only polluting the natural environment, but also threatening human health. Therefore, it needs to be dephenolized before it can be discharged. Today I will introduce to you the salicylic acid phenol wastewater treatment equipment.
Phenol reacts with sodium hydroxide to produce sodium benzoate, which is then dehydrated by distillation and then hydroxylated with carbon dioxide to produce sodium salicylate, which is then acidified with sulfuric acid to obtain a crude product, which is then refined by sublimation to obtain the finished product. In the above process, the source of wastewater in the production of salicylic acid is mainly the mother liquor after centrifugal separation in the washing section. To dispose of this wastewater, the following process can be used to operate.
Operation Method for Treating Phenolic Wastewater
Phenol-containing wastewater is put into the centrifugal extractor. At the same time, the extractant enters the centrifugal extractor in proportion. After three-stage extraction and dephenolization, the wastewater is discharged from the centrifugal extractor. The loaded organic phase enters the centrifugal extractor for stripping. At the same time, liquid alkali enters the centrifugal extractor in proportion to perform three-stage stripping and alkali washing on the loaded organic phase. After three-stage alkali washing, the extractant can be recycled. After stripping, the sodium phenolate liquid is discharged from the centrifugal extractor for sodium phenolate recovery, creating economic benefits.
CWL-M centrifugal extractor is a liquid-liquid extraction and separation equipment independently developed and produced by Zhengzhou Tiei Extraction. It is mainly used for extraction and separation operations of two-phase liquids and can be widely used in many fields such as chemical industry, hydrometallurgy, environmental protection, fine chemicals, petroleum, etc.
Advantages of CWL-M Centrifugal Extractor
- Centrifugal extractor has a simple and stable structure. It adopts a top-suspended single-point structure. There is no bottom bearing and mechanical seal in the processing area, and there is no risk of leakage. It solves the problem of frequent failures and short service life of centrifugal extractors and saves equipment maintenance costs.
- Larger processing capacity and more energy-saving (under the same processing capacity, its power consumption is 1/10~1/3 of the traditional annular gap structure centrifugal extractor).
- The equipment can be made of perfluorinated polymer materials, which can resist corrosion from strong acids (hydrochloric acid, mixed acids, etc.).
- The mixing and separation effects are good, and a variety of mixing structures can be selected. The separation effect is high and it can be applied to systems that are easy to emulsify.
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