METHOD OF OBTAINING PHENOL FROM CUMENE Russian patent published in 2015 - IPC C07C39/04 C07C37/08 C07C409/10 C07C407/00 B01J19/24 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of continuous or semi-continuous obtaining phenol from cumene via cumenehydroperoxide (CHP), as well as to the installation for its realisation. The claimed method includes: a) obtaining CHP by oxidation of cumene with an oxygen-containing gas in an airlift reactor, including: a1) cylindrical construction, equipped with lower and upper locking elements, with the said elements being respectively provided with means for the supply of reagents and means for the discharge of reaction products (mainly CHP), vapours and the gas which did not react; a2) second in fact cylindrical construction (vertical channel), open at ends (bases), located inside and coaxially to the first construction; and a3) toroidal gas-distributor, located in the reactor base around the second in fact cylindrical construction; b) increase of the concentration of a CHP-containing solution, discharged from the airlift reactor to, at least, 70 wt %; c) obtaining phenol by means of the reaction of acidic CHP cleavage in the presence of acetone, in a circulation reactor, in which the reaction heat is discharged into two heat-exchangers, located successively in the cycle. In the airlift reactor for CHP obtaining the vertical channel is provided with an upper and/or lower cone-like extension in such a way that the ratio A1/A2 of the larger transverse section A1 to the smaller transverse section A2 of the said cone-like extension constitutes from 1.1 to 2, and in the circulation reactor for obtaining phenol points of CHP and acetone supply are located in pairs and each pair is located upward in the flow relative to each heat-exchanger.

EFFECT: invention makes it possible to improve selectivity with respect to CHP at the stage of cumene oxidation and obtain phenol with high selectivity at the stage of CHP cleavage.

12 cl, 4 dwg, 1 ex