Method for the anticorrosive treatment of waste plastics treating equipment
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United States of America Patent
Stats
-
Aug 21, 2001
Grant Date -
N/A
app pub date -
Jan 29, 1999
filing date -
Jan 29, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This invention relates to equipment for treating the aforesaid waste plastics directly with supercritical water, and an object thereof is to provide a method for the anticorrosive treatment of waste plastics treating equipment which makes it possible to use inexpensive stainless steel. Waste plastics treating equipment made of stainless steel is charged with a predetermined amount of an aqueous solution containing at least one alkali metal salt, and this aqueous solution is deaerated until its dissolved oxygen content is reduced to 0.5 mg/L or less. After the temperature and pressure of the equipment are raised until supercritical conditions are established, these temperature and pressure are maintained for a predetermined period of time.
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- 1 Citation Count
- C23C Class
- 2.17 % this patent is cited more than
- 24 Age