| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: invention relates to a method for continuous extraction of phenol from a partial stream formed during production of bisphenol A, where said partial stream contains 40-90 wt % phenol, 5-40 wt % bisphenol A, as well as 5-40 wt % by-products of the reaction of phenol and acetone to bisphenol A, in which a) a partial stream is fed into a vacuum distillation column containing at least 5 theoretical separation steps, b) in the vacuum distillation column phenol is distilled through the head part, c) a first portion of the stream from the base of the column is released from the process, and d) a second portion of the stream from the base of the column is continuously fed into the reactor in which there is isomerisation and splitting of bisphenol A and by-products contained in the stream from the base of the column to form phenol at temperature higher than 190C and hydrodynamic holding for at least 120 minutes in the presence of an acid catalyst and then returned to the vacuum distillation column. Mass flow of the portion of the stream from the base of the column fed into the reactor is more than 30% of the mass flow of the partial stream at step a) fed into the vacuum distillation column. ^ EFFECT: method enables efficient processing of streams coming from production of bisphnol A to obtain highly pure phenol with high output. ^ 5 cl, 1 tbl, 7 ex, 1 dwg |
