Patent ID: 7514060

Claim:
A method for producing a porous potassium carbonate, the method comprising calcining potassium hydrogen carbonate crystals having a mean particle diameter of from 100 to 1,000 μm at a temperature of the object to be calcined of from 100 to 500° C., while introducing a dry gas which has a dew point of not higher than 0° C. and a temperature of from 10 to 50° C., wherein the object to be calcined is continuously calcined, while the dry gas is introduced in counter flow to the object to be calcined; the calcination is carried out in an external heating type rotary kiln; and an impact is given from outside of the external heating type rotary kiln to the portion where the potassium hydrogen carbonate becomes potassium carbonate to prevent sticking of the potassium carbonate.