Sewage treatment device for synthesis reaction of phenol and acetone

Abstract

The invention discloses a sewage treatment device for a synthesis reaction of phenol and acetone. The device is formed through assembly connection of a neutralization kettle, an oil-water separator, asettling tank, a falling-film evaporator, a rectification tower, evaporation crystallization chambers and other equipment through pipelines. Wastewater produced by the rectification tower mainly comprises low-boiling organic matter and a sodium sulfate salt, multi-effect operation is carried out after the wastewater is introduced into the falling-film evaporator so as to achieve sufficient gas-liquid separation, and after the high-boiling sodium sulfate aqueous solution is introduced into a second evaporation crystallization chamber, centrifugal separation and washing are performed on the high-boiling sodium sulfate aqueous solution and sodium sulfate crystal produced in a first evaporation crystallization chamber so as to complete high-purity extraction of sodium sulfate, wherein the recovery rate is high, direct recycling utilization is performed, and the sewage treatment cost is reduced greatly; and the phenol removal rate reaches 99.5% or above after the sewage is treated, the removal rate of acetone, methanol and CODcr reaches 98.5-99.6%, the extraction rate of sodium sulfate reaches 92% or above, and the purity is larger than 95%.

Description

technical field [0001] The invention relates to the field of chemical wastewater treatment equipment, in particular to a sewage treatment device used for the synthetic reaction of phenol and acetone. Background technique [0002] Phenol, commonly known as carbolic acid, is a colorless acicular or white massive crystal with aromatic odor, and is an important raw material for the production of dyes, pharmaceutical intermediates, explosives, plastics and other products. Acetone is an important organic solvent, but also a raw material for surfactants, medicines, plexiglass, and epoxy resins. Common production methods for phenol and acetone include cumene method, toluene-benzoic acid method, oxidation method, etc. At present, more than 90% of phenol in the world is produced by the cumene method, mainly through four main processes of alkylation reaction of benzene and propylene, oxidation, hydrolysis and concentration. [0003] A certain amount of high-concentration organic wast...

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Problems solved by technology

The following problems still exist in the existing device and method for the sewage treatment of phenol-acetone synthesis reaction: 1, raw material phenol and acetone have good water solubility, can be miscible with water in almost any ratio, and are difficult to separate; hydroxyketone, formaldehyde , methanol, cumene and other components are dissolved in organic solvents; the content of sodium sulfate is high, the separation and purification rate is low, and the residual rate after treatment is high; 2. After treatment by sewage treatment equipment, the removal rate of phenol cannot reach more than 99%. The removal rate of acetone, methyl alcohol, CODcr can not reach more than 98%; 3, the sodium sulfate productive rate after crystallization purification is low, and purity is less than 95%

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