Treatment method of cyclohexanone saponification alkali waste

Abstract

The invention relates to a treatment method of cyclohexanone saponification alkali waste. The method includes: injecting alkali waste into an alkali recovery furnace, using a fuel to help combustion, combusting the alkali waste in the presence of an oxygen-containing gas, subjecting the tail gas generated by combustion to electric dedusting to recover dry alkali ash, and leaving the melt generated from combustion to flow out from a furnace bottom chute. The method is characterized by: crushing the melt coming from the chute by a fluid into particles or powder, which then enter a water solution, then getting the particles or powder out of the water solution by a solid-liquid separation device, thus obtaining moisture-containing coarse alkali; using a feeding device to deliver the moisture-containing coarse alkali into a one-stage or multi-stage series dryer, which is provided with a scale plate conveyor line, a heat supply air hood, a stirrer and a dehumidifying air hood inside; introducing a high temperature gas into the dryer to serve as a drying heat source, and discharging the water vapor generated by water evaporation of the moisture-containing coarse alkali and the tail gas from thermal conversion out of the system by the dehumidifying air hood disposed in the dryer through a dehumidifying air course system; and after drying the moisture-containing coarse alkali by the dryer, discharging it from a last-stage dryer outlet. The method provided in the invention has the advantages that: complete recovery of melt generated by alkali waste combustion by means of drying the coarse alkali can achieve a good drying effect, the recovered material has a low water content, and no wastewater is generated. Thus, the method can be used for chemical industrial production of cyclohexanone and the like, and has good environmental protection significance and economic benefits.

Description

Technical field [0001] The invention relates to a method for treating waste alkali from cyclohexanone saponification, and more specifically to a method for drying wet alkali produced by incineration of waste alkali, and belongs to the treatment and recycling of high-concentration waste liquid in chemical production. Background technique [0002] At present, most of the industrial-scale production of cyclohexanone adopts the cyclohexane oxidation process. During the decomposition and saponification process, a large amount of high-concentration waste saponification lye is produced, with COD of 300,000 mg / L or more, and the output is> 0.9 tons / ton of cyclohexanone. The harmless treatment of high-concentration saponified waste alkali was an important factor restricting the development of the cyclohexanone industry at home and abroad before 2000. As a result, the cyclohexanone industry has reduced production or even shut down. With the development and improvement of waste alkali in...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to invent a new method for processing cyclohexanone saponification spent caustic soda, on the basis of the technology of incinerating spent caustic soda by the original soda recovery method, overcome the technical defect that the melt directly flows into the dissolution tank, improve the safety of the technology, and solve the problem of Environmental pollution and waste of alkaline water discharge, recovery of molten material and continuous drying, to achieve renewable utilization of resources