Apparatus for continuously chlorinating pulp including automatic control of the degree of chlorination

Claim 1

APPARATUS FOR CONTINUOUSLY CHLORINATING CELLULOSIC PULP COMPRISING IN COMBINATION CHLORINE GAS DISPERSER MEANS HAVING INLET FOR CHLORINE GAS AND WATER AND AN OUTLET FOR DISPERSED CHLORINE GAS; RETENTION CHLORINATOR MIXER MEANS CONNECTED TO THE OUTLET OF SAID DISPENSER MEANS AND HAVING AN INLET FOR SAID PULP SUSPENDED IN WATER; SAID MIXER MEANS BEING PROVIDED WITH AGITATOR MEANS AND BEING OF SUFFICIENT CAPACITY TO RETAIN AN INGOING PORTION OF THE PULP IN CONTACT WITH DISPERSED CHLORINE GAS ENTERING SAID MIXER MEANS FROM SAID DISPENSER MEANS IN SAID MIXER MEANS FOR PERIOD OF AT LEAST ABOUT 1 1/2 MINUTES; SAID MIXER HAVING AN OUTLET FOR SAID PULP; UPFLOW CHLORINATING MEANS HAVING A BOTTOM INLET CONNECTED TO THE OUTLET OF SAID MIXER MEANS TO RECEIVE PULP FROM SAID MIXER MEANS AND HAVING AN OUTLET FOR SAID PULP IN ITS UPPER SECTIONS; DOWNFLOW CHLORINATOR RETENTION MEANS HAVING AN UPPER SECTION ARRANGED TO RECEIVE PULP DISCHARGED FROM SAID UPFLOW CHLORINATOR MEANS; SAID DOWNFLOW MEANS BEING LARGER IN CAPACITY THAN SAID UPFLOW MEANS; SAID DOWNFLOW MEANS BEING PROVIDED WITH AN OUTLET NEAR IT BOTTOM SECTION;