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Title: Method and apparatus for waste destruction using supercritical water oxidation

The invention relates to an improved apparatus and method for initiating and sustaining an oxidation reaction. A hazardous waste, is introduced into a reaction zone within a pressurized containment vessel. An oxidizer, preferably hydrogen peroxide, is mixed with a carrier fluid, preferably water, and the mixture is heated until the fluid achieves supercritical conditions of temperature and pressure. The heating means comprise cartridge heaters placed in closed-end tubes extending into the center region of the pressure vessel along the reactor longitudinal axis. A cooling jacket surrounds the pressure vessel to remove excess heat at the walls. Heating and cooling the fluid mixture in this manner creates a limited reaction zone near the center of the pressure vessel by establishing a steady state density gradient in the fluid mixture which gradually forces the fluid to circulate internally. This circulation allows the fluid mixture to oscillate between supercritical and subcritical states as it is heated and cooled.
 [1];  [2]
  1. (1251 Sprague St., Manteca, CA 95336)
  2. (2270 Goldenrod La., San Ramon, CA 94583)
Issue Date:
OSTI Identifier:
Haroldsen, Brent Lowell (1251 Sprague St., Manteca, CA 95336);Wu, Benjamin Chiau-pin (2270 Goldenrod La., San Ramon, CA 94583) SNL
Patent Number(s):
US 6030587
Contract Number:
Research Org:
Country of Publication:
United States
method; apparatus; waste; destruction; supercritical; water; oxidation; relates; improved; initiating; sustaining; reaction; hazardous; introduced; zone; pressurized; containment; vessel; oxidizer; preferably; hydrogen; peroxide; mixed; carrier; fluid; mixture; heated; achieves; conditions; temperature; pressure; heating; means; comprise; cartridge; heaters; placed; closed-end; tubes; extending; center; region; reactor; longitudinal; axis; cooling; jacket; surrounds; remove; excess; heat; walls; manner; creates; limited; near; establishing; steady; density; gradient; gradually; forces; circulate; internally; circulation; allows; oscillate; subcritical; cooled; supercritical conditions; carrier fluid; jacket surrounds; tubes extend; tubes extending; hydrogen peroxide; heating means; water oxidation; hazardous waste; containment vessel; pressure vessel; reaction zone; longitudinal axis; improved apparatus; cooling jacket; excess heat; density gradient; oxidation reaction; supercritical water; fluid mixture; means comprise; remove excess; preferably water; waste destruction; /422/