Use of a catalyst composition for the catalytic depolymerization of plastics waste
AssigneeSolvay SA
InventorsStéphane Streiff, Marco Piccinini, Avelino Corma, Miriam Cerro-Alarcón, Jesús Mengual
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Abstract
Use of a catalyst composition comprising A) a first component containing oxidic compounds comprising aluminum and silicon with a molar ratio of silicon to aluminum of more than 1) B) a second component containing an oxidic compound of silicon wherein the ratio of the number of acidic sites of component A, determined by temperature programmed desorption with ammonia as a base, to the number of acidic sites of component B, determined under the same conditions, is at least 3: in a process for the catalytic depolymerization of plastics waste.
Claims16
A process comprising catalytic depolymerization of plastics waste using a catalyst composition comprising
- A) a first component containing oxidic compounds comprising aluminum and silicon with a molar ratio of silicon to aluminum of more than 1, and
- B) a second component containing an oxidic compound of silicon;
- wherein the ratio of the number of acidic sites of component A, determined by temperature programmed desorption with ammonia as a base, to the number of acidic sites of component B, determined under the same conditions, is at least 3:1;
- and wherein the catalyst composition contains at least 50 wt %, based on the combined weight of components A and B, of component B.
A catalytic composition, comprising
- A) a first component containing oxidic compounds comprising aluminum and silicon with a molar ratio of silicon to aluminum of more than 1 and
- B) a second component containing an oxidic compound of silicon,
- wherein the ratio of the number of acidic sites of component A, determined by temperature programmed desorption with ammonia as a base, to the number of acidic sites of component B, determined under the same conditions, is at least 3:1, and wherein the catalyst composition contains at least 50 wt %, based on the combined weight of components A and B, of component B.
A process for the catalytic depolymerization of plastic waste, the process comprising
- a) in a first step, introducing plastics waste into a reactor, melting the plastics waste, and thereafter increasing the temperature to a temperature in the range of from 350 to 600° C.,
- b) thereafter adding, to the molten plastics, a catalytic composition comprising as component A) a fluid catalytic cracking (FCC) catalyst and as component B) a compound based on oxidic compounds of silicon, wherein the ratio of the number of acidic sites of component A to the number of acidic sites of component B is at least 3:1, and wherein the catalyst composition contains at least 50 wt %, based on the combined weight of components A and B, of component B,
- c) carrying out the catalytic depolymerization at a temperature of from 350 to 600° C., and
- d) recovering the product fractions formed.
Dependencies are inferred from the claim text.