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US 4,051,212 AGranted
Process for the continuous degradation of plastics
AssigneeBayer Aktiengesellschaft
InventorsErnst Grigat, Hartmut Hetzel
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Abstract
The instant invention relates to a continuous process for the hydrolytic degradation of plastics wherein a hydrolyzable material is introduced with water into a screw machine, and is subjected therein to a temperature of 100 to 300.degree. C, and a pressure of 5 to 100 bars for 2 to 100 minutes. The invention also relates to an apparatus useful in conducting the process.
Claims5
A process for the continuous hydrolytic degradation of waste plastics comprising
- a. continuously introducing a hydrolyzable plastic waste material into a screw machine,
- b. continuously allowing air to escape from said screw machine,
- c. continuously introducing water into said screw machine, thereby producing a plastic-water mixture,
- d. subjecting said mixture to a temperature of from 100.degree. to 300.degree. C, a pressure from 5 to 100 bars, and intensive screw mixing in a reaction zone of said screw machine for a period of from 2 to 100 minutes whereby liquid and gaseous hydrolysis products are formed,
- e. continuously allowing the liquid and gaseous hydrolysis products to enter a liquid-gas separatory nozzle,
- f. continuously allowing the liquid to leave the nozzle through a first regulating valve which maintains a constant liquid level in the nozzle, and
- g. continuously allowing the gas to leave the nozzle through a second regulatory valve which maintains a constant pressure in the nozzle at a pressure of the reaction zone.
4 more elements
Dependencies are inferred from the claim text.