BOILER WATER TREATMENT AGENT AND METHOD FOR THE TREATMENT OF WATER

摘要

A boiler water treatment agent which exerts excellent anticorrosive performance in a wider region of a boiler water system; and a method for the treatment of water. Use of a boiler water treatment agent which contains both a condensed tannin and/or a derivative thereof and a caustic alkali and in which the B/A mass ratio of the content (B) of the caustic alkali to the content (A) of the condensed tannin and/or derivative thereof is 0.4 or above; or addition of both a condensed tannin and/or a derivative thereof and a caustic alkali to a boiler water system in such amounts as to give a B/A mass ratio of 0.4 or above wherein (B) is the amount of the added caustic alkali and (A) is the amount of the added condensed tannin and/or derivative thereof.