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

Patent metadata

Field	Value
Publication number	US-2018371326-A1
Application number	US-201616062723-A
Country	US
Kind code	A1
Filing date	Dec 15, 2016
Priority date	Dec 18, 2015
Publication date	Dec 27, 2018
Grant date	—

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.

First claim

1 . 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.

2 . The process of claim 1 wherein component A comprises supported or unsupported zeolites.

3 . The process of claim 1 wherein component A) is a fresh fluid catalytic cracking catalyst, an equilibrium fluid catalytic cracking catalyst or a mixture thereof.

4 . The process of claim 1 wherein the catalyst composition contains at least 50 wt %, based on the combined weight of components A and B, of component B.

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

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

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

8 . 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.

9 . The catalytic composition in accordance with claim 8 wherein component A) comprises supported or unsupported zeolites.

10 . The catalytic composition in accordance with claim 8 wherein component A) is a fresh fluid catalytic cracking catalyst, an equilibrium fluid catalytic cracking catalyst or a mixture thereof.

11 . The catalytic composition in accordance with claim 8 wherein the ratio of the number of acidic sites of component A to the number of acidic sites of component B, determined under the same conditions, is at least 5:1.

12 . A process for the catalytic depolymerization of plastic waste wherein
a) in a first step plastics waste is introduced into a reactor and melted and thereafter the temperature is increased to a temperature in the range of from 350 to 600° C., b) thereafter 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, is added to the molten plastics, c) the catalytic depolymerization is carried out at a temperature of from 350 to 600° C., and d) the product fractions are recovered.

13 . The process in accordance with claim 12 wherein component A) is a fresh fluid catalytic cracking catalyst, an equilibrium fluid catalytic cracking catalyst or a mixture thereof.

14 . The process of claim 12 wherein the plastic waste comprises at least 50 wt % of polyolefins, styrene polymers or mixtures thereof.

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

Assignees

• Solvay

Inventors

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

Classifications

• C10G2400/02

  Gasoline · CPC title

• C10G1/10 Primary

  from rubber or rubber waste · CPC title

• C10G2400/04

  Diesel oil · CPC title

• C08J2323/06

  Polyethene · CPC title

• C08J11/16

  by treatment with inorganic material (C08J11/14 takes precedence) · CPC title