Method for high resource treatment of cyclohexanone waste saponification lye

Abstract

The invention relates to a method for high resource treatment of cyclohexanone waste saponification lye. The method is improvement on a method for performing zero emission treatment on waste saponification lye produced by producing cyclohexanone through cyclohexane oxidation technology. By using the method, a process is set that sodium sulfate and pulverized coal are calcined to obtain sodium sulfide and carbon dioxide flue gas on the basis of the prior art, carbon dioxide in flue gas reacts with sodium hydroxide and sodium carbonate in initial waste lye to generate sodium hydrogencarbonate, and partial moisture is evaporated in the waste lye by high-temperature heat in the flue gas. The method utilizes the joint production of the cyclohexanone waste saponification lye to obtain chemical resources with higher level such as sodium carbonate, sodium sulfide, monoprotic organic acid, clean fuel oil and the like, and has more remarkable economic benefit; the method achieves the zero emission through the treatment of a waste with another waste, completely roots up the pollution of the waste lye on the environment, and has remarkable social benefit; and waste resources are circularly utilized, so the method has low energy consumption and mature process, is suitable for the large-scale treatment on the cyclohexanone waste saponification lye, and is also used for industrialized production of the chemical resources in the waste lye.

Description

technical field [0001] The invention relates to chemical wastewater treatment technology, in particular to a method for high-resource treatment of cyclohexanone saponification waste lye. Background technique [0002] Cyclohexanone is an important chemical raw material for the production of caprolactam, the manufacture of resins, and the synthesis of pesticides and pharmaceuticals. The industrial production of cyclohexanone mostly adopts cyclohexane liquid phase oxidation process. The high-concentration waste lye discharged during the production process has a COD value as high as 5×10 5 mg / L, and generally 80%-90% of waste lye is produced for every ton of cyclohexanone produced. At present, the common methods for processing such waste lye mainly adopt incineration or acid neutralization. The former can completely eliminate pollution, but the investment in incineration equipment is large, the treatment cost is high, and other valuable energy is consumed at the same time; th...

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Problems solved by technology

But the above-mentioned process is not the most perfect, for example: the process of introducing a sufficient amount of carbon dioxide gas or clean flue gas into the saponification waste lye must be implemented with the help of external conditions; in the evaporation and concentration process conditions involved, it is necessary to provide additional Thermal energy is completed; the added value of the recovered chemical resources is not high enough, all of which are fly in the ointment and need to be improved

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