Sulfuric acid production by absorption

Claim 1

A PROCESS OF PRODUCING SULFURIC ACID WHICH COMPRISES THE STEPS OF (1) MAINTAINING A BODY OF AQUEOUS ABSORBING SULFURIC ACID, (2) CONTINUOUSLY INJECTING SULFUR TRIOXIDE-CONTAINING GASES BELOW THE SURFACE OF SAID ACID AND THEREBY CAUSING REACTION OF SAID SULFUR TRIOXIDE THEREWITH TO FORM PRODUCT ACID WHILE SIMULTANEOUSLY GENERATING HEAT OF ABSORPTION AND (3) CONTINUOUSLY MIXING WITH SAID BODY OF ACID A QUANTITY OF WATER WHICH IS CHEMICALLY EQUIVALENT TO SAID SULFUR TRIOXIDE PLUS SUFFICIENT TO DILUTE SAID PRODUCT ACID TO A DESIRED VALUE WITHIN THE RANGE OF 70%-93% CONCENTRATION WHILE (4) RETAINING WITHIN SAID BODY OF ACID SUFFICIENT HEAT OF ABSORPTION FROM PART OF THE ABSORBED SULFUR TRIOXIDE TO MAINTAIN IT AT THE BOIL AND BOILING SAID ACID BY VIRTUE OF THE HEAT OF ABSORPTION OF THE REMAINDER OF SAID SULFUR TRIOXIDE AND THEREBY TRANSFORMING BOTH SULFURIC ACID AND WATER INTO VAPOR, (5) ADDING TO SAID BODY OF ACID AN ADDITIONAL QUANTITY OF WATER EQUAL TO THAT REMOVED AS VAPOR AND (6) CONTINUOUSLY WITHDRAWING PRODUCT ACID FROM SAID BODY OF ABSORBING ACID.