Method of refining dihydroxyaryl compound

A method of refining a dihydroxyaryl compound, comprising:

• evaporating a dihydroxyaryl compound in a distillation column, wherein a top outlet of the distillation column is connected to a condenser;
• applying a hot water or steam treatment to the inside surface of the condenser while said evaporation step is continued;
• condensing the resultant vapor fraction of the dihydroxyaryl compound in said condenser so that the condensed dihydroxyaryl compound comes into contact with said inside surface of the condenser;
• and
• collecting the condensed dihydroxyaryl compound fraction into a storage tank through a conduit connected to an outlet of the condenser;
• wherein the condenser has an inside surface thereof formed from a metal material comprising at least 25% by weight nickel.

A method of refining a dihydroxyaryl compound, comprising:

• applying a hot water or steam treatment to the inside surface of a condenser connected to a top outlet of a distillation column;
• evaporating a dihydroxyaryl compound in the distillation column, said evaporation step occurring after the hot water or steam treatment step;
• condensing the resultant vapor fraction of the dihydroxyaryl compound in said condenser so that the condensed dihydroxyaryl compound comes into contact with said inside surface of the condenser;
• and
• collecting the condensed dihydroxyaryl compound fraction into a storage tank through a conduit connected to an outlet of the condenser;
• wherein the condenser has an inside surface thereof formed from a metal material comprising at least 25% by weight nickel.