Process for producing chlorine dioxide,chlorine and a neutral sulfate salt in the sulfate or kraft process of preparing wood pulp

Abstract

Abstract A CONTINUOUS PROCESS IS PROVIDED FOR THE PRODUCTION OF CHLORINE DIOXIDE, CHLORINE AND A NEUTRAL SULFATE SALT WHICH COMPRISES FEEDING A CHLORATE, A REDUCING AGENT, A BISULFATE AND SULFURIC ACID TO A CHLORINE DIOXIDE GENERATOR TO FORM AN AQUEOUS REACTION SOLUTION WHICH IS MAINTAINED AT A TEMPERATURE OF FROM ABOUT 50 TO ABOUT 100 DEGREES CENTIGRADE, AT A PRESSURE FROM ABOUT 50 MILLIMETERS MERCURY ABLOLUTE TO ABOUT ATMOSPHERIC PRESSURE, WHILE MAINTAINING THE CONCENTRATION OF SAID CHLORATE FROM ABOUT 0.2 TO ABOUT 2.5 MOLES PER LITER, MAINTAINING THE CONCENTRATION OF SAID REDUCING AGENT FROM ABOUT 0.2 TO ABOUT 2.5 MOLES PER LITER, MAINTAINING THE ACIDITY OF SAID REACTION SOLUTION BETWEEN ABOUT 2 TO ABOUT 6 NORMAL IN SULFURIC ACID AND COORDINATING THE BISULFATE FEED RATE WITH THE SULFURIC ACID FEED RATE TO PROVIDE AN ACID HYDROGEN RADICAL TO SULFATE RADICAL RATIO FROM ABOUT 1.05-1.95. THE BISULFATE FEED MATERIAL AS WELL AS A PORTION PF THE REDUCING AGENT, IN THE FORM OF AN ALKALI METAL CHLORIDE, IS ADVANTAGEOUSLY SUPPLIED FROM THE BY-PRODUCT OF THE REACTION OF SODIUM CHLORIDE WITH CONCENTRATED SULFURIC ACID TO PRODUCE HYDROCHLORIC ACID.

Inventors

• 👤 W Fuller

Bibliographic Details