Use of a catalyst composition for the catalytic depolymerization of plastics waste

Patent metadata

Field	Value
Publication number	US-10537876-B2
Application number	US-201616062696-A
Country	US
Kind code	B2
Filing date	Dec 15, 2016
Priority date	Dec 18, 2015
Publication date	Jan 21, 2020
Grant date	Jan 21, 2020

Abstract

Use of a catalytic composition parameters comprising oxides of aluminum or oxidic compounds comprising aluminum and silicon with a molar ratio of aluminum to silicon of more than 1 in a process for the catalytic depolymerization of plastics waste.

First claim

The invention claimed is:

1. A process comprising catalytically de-polymerizing plastics waste in the presence of a catalytic composition comprising oxidic compounds comprising aluminum and silicon with a molar ratio of aluminum to silicon of more than 1, wherein the catalytic composition comprises from 50 to 100 wt %, based on the weight of the composition, of at least one catalytically active amorphous aluminum oxide component which is aluminosilicate and from 0 to 50 wt %, based on the weight of the composition, of a crystalline catalytically active component containing at least one microporous aluminosilicate.

2. The process of claim 1 wherein the catalytic composition comprises an aluminosilicate compound wherein a silicon oxide component is chemically compounded with an aluminum oxide component.

3. The process of claim 2 wherein the aluminium oxide component is an acid dispersible alumina, a clay or a non-dispersible alumina.

4. The process of claim 1 wherein the catalytic composition comprises an oxide of silicon in an amount of from 0.5 to 50 wt (expressed as SiO 2 equivalent), based on the weight of the composition.

5. The process of claim 1 wherein the catalyst composition comprises one or more additional metals selected from the group consisting of magnesium, calcium, zinc, boron, titanium, and zirconium; or comprises phosphorus.

6. The process of claim 1 wherein plastics waste is selected from post consumer waste plastics, off-spec plastics and industrial scrap plastic.

7. The process of claim 1 wherein the plastics waste comprises at least 50 wt % of polyolefins, styrene polymers or mixtures thereof.

8. The process of claim 1 wherein the plastics waste is essentially free of thermosetting polymers.

9. A process for the catalytic de-polymerization of plastic waste, the process comprising:
a) 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) adding a catalytic composition comprising oxidic compounds comprising aluminium and silicon with a molar ratio of aluminium to silicon of more than 1 to the molten plastics, wherein the catalytic composition comprises from 50 to 100 wt %, based on the weight of the composition, of at least one catalytically active amorphous metal oxide component which is aluminosilicate and from 0 to 50 wt %, based on the weight of the composition, of a crystalline catalytically active component containing at least one microporous aluminosilicate,
c) carrying out the catalytic depolymerization at a temperature of from 350 to 600° C., and
d) recovering the product fractions produced.

10. The process of claim 9 wherein the catalytic composition comprises an aluminosilicate compound wherein a silicon oxide component is chemically compounded with an aluminium oxide component.

11. The process of claim 9 wherein the plastic waste comprises at least 50 wt % of polyolefins, styrene polymers or mixtures thereof.

12. The process of claim 9 wherein the plastics waste is selected from the group consisting of post consumer waste plastics, off-spec plastics and industrial scrap plastic.

13. The process of claim 10 wherein the aluminium oxide component is an acid dispersible alumina, a clay and or non-dispersible alumina.

Assignees

• Solvay

Inventors

• Streiff Stéphane
• Piccinini Marco
• Liebens Armin T
• Corma Avelino
• Cerro-Alarcón Miriam
• Mengual Jesús

Classifications

• B01J23/624

  with germanium · CPC title

• C10G1/10

  from rubber or rubber waste · CPC title

• B01J29/06

  Crystalline aluminosilicate zeolites; Isomorphous compounds thereof · CPC title

• B01J21/04 Primary

  Alumina · CPC title

• B01J21/066

  Zirconium or hafnium; Oxides or hydroxides thereof · CPC title