Patent ID: 8540960

Claim:
A method for producing ultra-clean and high-purity hydrochloric acid comprising the following steps: step 1: adding a dearsenical agent to industrial grade hydrochloric acid at room temperature and reacting for 0.5-1.5 hours to remove arsenic; filtering the hydrochloric acid and collecting a filtrate; step 2: atmospherically rectifying the filtrate at a temperature of 115-116° C. in a top part of a rectifying column with 0.5-1.5 meter/second gas flow rate in the column, and heating steam to 118-120° C. to produce overheated steam during the rectification; then filtering the overheated steam through a microporous membrane having 0.1 μm apertures; and step 3: condensing the overheated steam filtered in step 2 and collecting a fraction, and filtering the fraction through a microporous membrane.