Patent name: METHOD FOR TREATMENT OF PHENOL FROM IMPURITIES
Patent Number: RU2266275
Priority:April 16, 2004
December 20, 2005
Invention relates to manufacturing phenol by cumene method, in particular, to the stage of treatment of final product and preparing phenol of high purity degree. Method for treatment of crude phenol is carried out in two steps. At the first step, method involves oxidation of hydroxyacetone, aldehydes and alpha-methylstyrene with air oxygen in phenol medium by using a heterogeneous catalyst comprising metals with transient valence. At the second step, method involves condensation of oxidation products and non-oxidized products by using a heterogeneous acid catalyst. Separation of compounds in the process of phenol treatment is carried out at the final step of recovery of the commercial product by distillation method. At the first step, metal compounds of secondary subgroups of 1 and 6 groups and metals of 8 group of Periodic system on neutral or acid carrier are used as a catalyst preferably. At the second step, aluminosilicate contacts based on zeolites of type "X" or "Y", or other zeolites comprising or not comprising promoting and modifying additives are used as a catalyst. Invention provides the high degree of purification of phenol from impurities and the improvement of economy indices of the process.