Solid phosphoric acid catalysts

Abstract

Abstract SOLID PHOSPHORIC ACID IS THE NAME WHICH HAS COME INTO USE FOR A CALCINED MIXTURE OF AN ACID OF PHOSPHOROUS AND A POROUS SILICEOUS MATERIAL. SOLID PHOSPHORIC ACID CATALYSTS HAVE FOR YEARS BEEN VIRTUALLY THE ONLY CATALYST EFFECTIVE IN MANY REACTIONS INVOLVING OLEFINS, PARTICULARLY THE POLYMERIZATION OF OLEFINS TO FORM HIGH OCTAN FUELS. THESE CATALYSTS ARE WIDELY USE DESPITE THEIR LACK OF STRENGTH AND POOR WEARING QUALITIES. HIGH STRENGTH SOLID PHOSPHORIC ACID CATALYSTS ARE PROVIDED HEREIN, THE UNIQUENESS OF THE CATALYST BEING ATTRIBUTABLE TO THE METHOD OR PREPARATION. P2O5 IS DRY BLENDED WITH THE SILICA MATERIAL TO FORM THE PRECURSOR. THE PRECURSOR IS THEN SUBJECTED TO A STEAM-AIR TREATMENT TO BRING ABOUT THE HYDRATION OF THE P2O5. THIS FORMS A SILICO-PHOSPHOROUS MATRIX. THID MATRIX IS PRESERVED BY NOT PHYSICALLY CHANGING THE CATALYST DURING ITS PREPARATION. THIS IS ACCOMPLISHED BY FORMING SPHERES OF THE CATALYST MATERIAL BY TUMBLING AND SPRAYING THE TUMING MASS WITH PHOSPHORIC ACID.

Inventors

• 👤 William R Gutmann
• 👤 Edward K Dienes

Bibliographic Details