Polyphenol mixture recycling purification technology

Abstract

The invention provides a polyphenol mixture recycling purification technology which comprises the steps of alkalization and phase splitting: heating a polyphenol mixture to react with a sodium carbonate solution to general phenol sodium salt, conveying reaction liquid into an alkalization and phase splitting tower for continuous reaction to generate the phenol sodium salt and phase splitting and obtaining a water phase rich in the phenol sodium salt and an organic light component, acidification, water washing and phenol extraction: conveying the water phase into an acidification tower for acidification, allowing an organic phase on the upper layer in the acidification tower to overflow into a water washing tower for washing treatment, ethanol crystallization mixing and adding the organic phase after the water washing and ethanol into a crystallizer for crystallization to form 2,3-dimethyl phenol, and rectification and separation: continuously conveying primary mother liquid into a primary rectification tower for rectification till a metacresol finished product with a content greater than 98% is generated continuously in the primary rectification tower, and conveying kettle liquid with a 3,5-dimethyl phenol content greater than 80% from the primary rectifying tower into a secondary rectification tower for continuous rectification and purification to form a product with the 3,5-dimethyl phenol content greater than 98%.

Description

technical field [0001] The invention belongs to a purification process, and more specifically relates to a polyphenol mixture resource purification process. Background technique [0002] 2,3-Dimethylphenol is a white crystal. Molecular formula is C 8 h 10 O, molecular weight 122.17, melting point 75°C, boiling point 218°C, density 1.014, CAS 526-75-0, soluble in water, alcohol and ether. 2,3-Dimethylphenol is mainly used in the manufacture of phenolic resins, plasticizers, dyes, flotation agents, insecticides, fungicides, mold adhesives, wood preservatives, antioxidants, lubricating oil additives, etc. [0003] m-cresol is a colorless or pale yellow liquid with the molecular formula C 7 h 8 O, molecular weight 108, melting point 8-11°C, boiling point 203°C, CAS 108-39-4, slightly soluble in water, soluble in ethanol, ether, and sodium hydroxide solution. m-cresol is mainly used as a pesticide intermediate to produce insecticides fenitrothion, fenthion, medicarb, permet...

AI Technical Summary

Problems solved by technology

Polyphenol mixtures are generally used as light components in existing treatment processes because their components have close boiling points and are still present in light components, but it is generally difficult to process them due to their similar component structures and similar boiling points

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