Process for working up municipal plastic waste materials by gasification

US5470361A · kind A · utility

Assignee

• Krupp Koppers GmbH · DE

Inventors

• Adolf Linke · Essen, DE
• Werner Pohl · Neubulach, DE
• Karl Schmid · Mettmann, DE
• Rolf Wetzel · Heiligenhaus, DE

Key dates

• Filing date: Oct 27, 1994
• Grant date: Nov 28, 1995
• Expiry date: Oct 27, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E50/30
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

In the process for gasification of municipal waste plastic waste material pieces of about a 20 mm piece size are compressed and heated at a pressure of from 40 to 80 bar until at a temperature of from 230.degree. to 300.degree. C. to produce an HCl-containing gas and a plastic waste material containing less than 3000 mg of HCl per kg and the HCl-containing gas produced is washed with water to produce a hydrochloric acid solution. The plastic waste material is then heated further until at a temperature of from 400.degree. to 500.degree. C. to form a plastic melt having a viscosity of less than 300 cSt, advantageously less than 50 cSt. This plastic melt is gasified at a pressure of 4 bar with oxygen in a flame reaction to form a crude gas containing a preponderant proportion of CO in relation to CO.sub.2 in a gasification chamber having a central temperature of about 1600.degree. C. The crude gas is withdrawn from the gasification reactor at a temperature of 1300.degree. to 1600.degree. C., quenched with a water spray to cool it until at a temperature of 700.degree. to 900.degree. C. and then further cooled by indirect heat transfer in a heat exchanger producing steam until at a temp…