Sulfur trioxide sulfonation method

Claim 1

IN A METHOD OF REACTING A LIQUID REACTANT SELECTED FROM THE GROUP CONSISTING OF PETROLEUM OIL, DODECYLBENZENE AND POLYDODECYLBENZENE, WITH SULFUR TRIOXIDE TO FORM A SULFONIC ACID WHEREIN A CLOSED CYCLIC FLOWING STREAM OF SULFONIC ACID IS CIRCULATING IN A FLOWING STREAM AXIALLY AND PERIPHERALLY OF A VERTICALLY ORIENTED CIRCULATING TUBE IN A VERTICALLY ORIENTED CLOSED REACTION VESSEL, THE IMPROVEMENT OF INTRODUCING SAID LIQUID REACTANT INTO SAID FLOWING STREAM AT AN UPMOST POINT, MECHANICALLY AGITATING AND IMPELLING SAID STREAM IMMEDIATELY JAFTER AND BELOW SAID FIRST INTRODUCTION TO THROUGHLY MIX AND DISPERSE THE LIQUID REACTANT IN THE STREAM INTRODUCING SULFUR TRIOXIDE INTO THE MIXED FLOWING STREAM IMMEDIATELY AFTER AND BELOW SAID FIRST MIXING, AND MECHANICALLYAGITATING SAID STREAM A SECOND TIME IMMEDIATELY BELOW AND FOLLOWING THE INTRODUCTION OF THE SULFUR TRIOXIDE TO THROUGHLY MIX AND DISPERSE SAID SULFUR TRIOXIDE IN THE FLOWING STREAM SO AS TO INITIATE THE DESIRED REACTION, AND WITHDRAWING SULFONIC ACID REACTION PRODUCT FROM THE STREAM.