Enyl phenol refining plant and method thereof

Abstract

The invention relates to an enyl phenol refining plant and a method thereof. The enyl phenol refining plant comprises a crystallizer 4 and a drawing and filtering tank 7, wherein the crystallizer 4 is connected with the drawing and filtering tank 7 by a valve 6; and the crystallizer 4 comprises a cylinder body, an upper end enclosure, a lower end enclosure, a flange, a finger-shaped pipe 1 with fins 3 and a filter device (filter board and filter fabric) 5. The method comprises the following steps of cooling crystallizing, heating and melting (sweating), drawing and filtering, washing and rectifying. Crystal after being vacuum-filtered and washed is heated to 70-100 DEG C by steam and directly sent for being rectified without solvent recrystallization after fully molten. The invention can lead the purity of the OPP product to reach more than 99.5 percent without sherwood oil recrystallization, and the refined yield of the OPP reaches more than 80 percent.

Description

technical field [0001] The present invention relates to an ortho-phenylphenol refining device and its method, in particular to a small amount of difficult-to-separate cyclohexylphenol and cyclohexene contained in the reaction product of cyclohexenylcyclohexanone dehydrogenation to o-phenylphenol The device and method for obtaining o-phenylphenol with a purity of more than 99.7% without solvent recrystallization and other impurities. Background technique [0002] O-phenylphenol (OPP) is a fine chemical and organic intermediate with a wide range of uses. It can be used as antiseptic, antifungal agent, broad-spectrum fungicide, used for fruit preservation, cosmetics, wood preservation, and household, public places, Disinfection of swimming pools and hospitals, it can also be used to produce oil-soluble o-phenylphenol formaldehyde resins, non-ionic emulsifiers, synthetic dyes, water-based cutting fluids, etc. Agents and intermediates of flame retardant polymer materials, etc. ...

AI Technical Summary

Problems solved by technology

It is reported in CN1490293A that the dehydrogenation product containing 86-90% OPP is heated and dissolved with 30% NaOH solution, then acidified with hydrochloric acid to obtain a crude product, and then recrystallized through petroleum ether to obtain an OPP product of ≥99.5%; CN1944364 reports a OPP continuous recrystallization process, this patent first removes low-boiling compounds such as phenol and biphenyl through pre-rectification of the dehydrogenation product containing about 90% of OPP, so that the OPP content can be increased to about 95%, and then used with petroleum ether solvent Mixing, pre-cooling, multi-step crystallization, centrifugal separation, continuous drying, automatic product packaging and other series of processes and equipment, complete the continuous refining of ortho-phenylphenol, with an OPP content of 99.7%, after pre-distillation and petroleum ether solvent recrystallization method, the pass rate of product refining is less than 70%

This method consumes a large amount of petroleum ether solvent, which not only increases production costs, but also affects safe production. The residual solvent in the product also affects the scope of use of OPP, and is especially not suitable for sterilization and disinfection of fruits, vegetables and daily chemicals.

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