Production of organic acids from aldehydes

Claim 2

IN A PROCESS FOR OXIDIZING AN ALDEHYDE WHICH INCLUDES THE STEP OF PASSING MOLECULAR OXYGEN THROUGH A STRONGLY ALKALINE AQUEOUS MIXTURE OF SAID ALDEHYDE, IN THE PRESENCE OF A SILVER CATALYST TO PRODUCE AN ALKALINE SALT OF THE ACID CORRESPONDING TO SAID ALDEHYDE, THE IMPROVEMENT WHICH COMPRISES INCREASING THE ACTIVE LIFE OF SAID CATALYST IN SAID PROCESS BY CONDUCTING SAID STEP IN THE PRESENT OF, PER 100 PARTS BY WEIGHT OF SAID SILVER CATALYST, AT LEAST 0.01 PART BY WEIGHT OF A MIXTURE OF TRIETHANOLAMINE AND THE TETRASODIUM SALT OF ETHYLENEDIAMINETETRAACETIC ACID.

Claim 3

IN A PROCESS FOR PRODUCING 2,3,-DIHYDRO-1,4-PYRAN2-CARBOXYLIC ACID, WHICH INCLUDES THE STEP OF OXIDIZING ACROLEIN DIMER TO AN ALKALINE SALT OF SAID ACID BY PASSING MOLECULAR OXYGEN THROUGH A STRONGLY ALKALINE AQUEOUS MIXTURE OF ACROLEIN DIMER, IN THE PRESENCE OF A SILVER CATALYST, THE IMPROVEMENT WHICH COMPRISES INCREASING THE ACTIVE LIFE OF SAID CATALYST IN SAID PROCESS BY CONDUCTING SAID STEP IN THE PRESENCE OF, PER 100 PARTS BY WEIGHT OF SAID SILVER CATALYST, AT LEAST 0.01 PART BY WEIGHT OF A MIXTURE OF TRIETHANOLAMINE AND THE TETRASODIUM SALT OF ETHYLENEDIAMINETETRAACETIC ACID.

Claim 4

IN A PROCESS FOR PRODUCING 2,3,-DIHYDRO-1,4-PYRAN2-CARBOXYLIC ACID, WHICH INCLUDES THE STEP OF OXIDIZING ACROLEIN DIMER TO AN ALKALINE SALT OF SAID ACID BY PASSING MOLECULAR OXYGEN THROUGH A STRONGLY ALKALINE AQUEOUS MIXTURE OF ACROLEIN DIMER, IN THE PRESENCE OF A SILVER CATALYST, THE IMPROVEMENT WHICH COMPRISES INCREASING THE ACTIVE LIFE OF SAID CATALYST IN SAID PROCESS BY CONDUCTING SAID STEP IN THE PRESENCE OF, PER 100 PARTS BY WEIGHT OF SAID SILVER CATALYST, AT LEAST 0.01 PART BY WEIGHT OF A MIXTURE OF TRIETHANOLAMINE AND THE TETRASODIUM SALT OF ETHYLENEDIAMINETETRAACETIC ACID.