METHOD OF PURIFYING ALKYLPHENOL

1514702 Purification of alkylphenols STERLITAMAX OPYTNO PROMYSH NEFTEKHIMISCHE ZAVOD and NOVOKUIBYSHEV FILIAL GIPROKAUCHUKA 17 March 1977 [17 March 1976] 11313/77 Heading C2C A method of purifying an alkylphenol from impurities contained therein, comprises effecting continuous crystallization of alkylphenol fed at a rate of from 0À12 to 0À31 hr-1 and washing the resulting crystals in a layer formed by the said crystals and moving downwards at a rate of from 0À1 to 1À0 hr-1, washing being performed with a solvent inert towards alkylphenol and moving in counterflow to the crystals at a rate of from 0À09 to 0À35 hr-1, and wherein the said washing is carried out in a washing element in the form of a vertical tube in which the crystals of alkylphenols are maintained in the form of a movable bed, the dimension of the same vertical tube being such that the ratio of the height of the moving layer of the crystals to the diameter of the crystal bed is at least 3.