Method of producing vanillin

Claim 1

A METHOD OF PRODUCING OXIDATION PRODUCTS INCLUDING THE CALCIUM DERIVATE OF VANILLIN FROM LIGNOSULFONIC ACID COMPOUNDS IN AN ALKALINE AQUEOUS MEDIUM CONTAINING LIME AS THE ACTIVE ALKALI IN AN AMOUNT SUFFICIENT TO AMINTAIN THE PH OF THE REACTION MIXTURE DETERMINED ON A SAMPLE WITHDRAWN FROM THE REACTION ZONE AND COOLED TO ROOM TEMPERATURE IN THE RANGE NOT LESS THAN 12 TO NOT MORE THAN THAT OF A SATURATED SOLUTION OF LIME IN THE SAME MIXTURE, WHICH COMPRISES INTRODUCING SAID COMPOUNDS INTO A REACTION ZONE, HEATING THE REACTION MIXTURE TO A TEMPERATURE NOT LESS THAN 120* C., NOR MORE THAN 200* C., MAINTAINING SAID ZONE UNDER SUPERATMOSPHERIC PRESSURE, CONTINUOUSLY PASSING A GAS CONTAINING FREE OXYGEN IN FINELY DISPERSED FORM THROUGH SAID REACTION ZONE, CONTINUOUSL REMOVING RESIDUAL GAS, THE RATE OF ADDITION AND REMOVAL OF SAID GAS BEING SUCH AS TO MAINTAIN A PARTIAL PRESSURE OF OXYGEN IN SAID ZONE OF LESS THAN 20 LB. PER SQUARE INCH, THE TIME OF SAID REACTION BEING LESS THAN FOUR HOURS.

Claim 2

A METHOD OF PRODUCING OXIDATION PRODUCTS INCLUDING THE CALCIUM DERIVATE OF VANILLIN FROM LIGNOSULFONIC ACID COMPOUNDS IN AN ALKALINE AQUEOUS MEDIUM CONTAINING LIME AS THE ACTIVE ALKALI IN AN AMOUNT SUFFICIENT TO AMINTAIN THE PH OF THE REACTION MIXTURE DETERMINED ON A SAMPLE WITHDRAWN FROM THE REACTION ZONE AND COOLED TO ROOM TEMPERATURE IN THE RANGE NOT LESS THAN 12 TO NOT MORE THAN THAT OF A SATURATED SOLUTION OF LIME IN THE SAME MIXTURE, WHICH COMPRISES INTRODUCING SAID COMPOUNDS INTO A REACTION ZONE, HEATING THE REACTION MIXTURE TO A TEMPERATURE NOT LESS THAN 120* C., NOR MORE THAN 200* C., MAINTAINING SAID ZONE UNDER SUPERATMOSPHERIC PRESSURE, CONTINUOUSLY PASSING A GAS CONTAINING FREE OXYGEN IN FINELY DISPERSED FORM THROUGH SAID REACTION ZONE, CONTINUOUSL REMOVING RESIDUAL GAS, THE RATE OF ADDITION AND REMOVAL OF SAID GAS BEING SUCH AS TO MAINTAIN A PARTIAL PRESSURE OF OXYGEN IN SAID ZONE OF LESS THAN 20 LB. PER SQUARE INCH, THE TIME OF SAID REACTION BEING LESS THAN FOUR HOURS.