Method for dissociating waste in a packed bed reactor

• US 5,435,982 A
• Filed: 06/27/1994
• Issued: 07/25/1995
• Est. Priority Date: 03/31/1993
• Status: Expired due to Fees

• Current Assignee: Quantum Catalytics LLC
• Original Assignee: Molten Metal Technology Incorporated
• Inventors: Wilkinson, Mark A.
• Primary Examiner(s): Lander, Ferris
• Assistant Examiner(s): Hendrickson, Stuart L.
• Application Number:
  US08/267,295
• Time in Patent Office: 393 Days
• Field of Search: 588/201, 501/155, 252/635, 423/650, 423/651, 423/418.2, 423/DIG. 12, 423/437 R
• US Class Current: 423/437.1
• CPC Class Codes: A62D 2101/04 Pesticides, e.g. insecticides, herbicides, fungicides or nematocides
• CPC Class Codes: A62D 2101/20 Organic substances
• CPC Class Codes: A62D 2101/22 containing halogen
• CPC Class Codes: A62D 2101/26 containing nitrogen or phosphorus
• CPC Class Codes: A62D 2101/28 containing oxygen, sulfur, selenium or tellurium, i.e. chalcogen
• CPC Class Codes: A62D 2101/40 Inorganic substances
• CPC Class Codes: A62D 2101/47 containing oxygen, sulfur, selenium or tellurium, i.e. chalcogen
• CPC Class Codes: A62D 2101/49 containing halogen
• CPC Class Codes: A62D 3/32 by treatment in molten chemical reagent, e.g. salts or metals
• CPC Class Codes: Y10S 423/12 Molten media

Abstract

A method for dissociating waste to its atomic constituents in a molten metal bath wherein the molten metal bath includes a refractory packing. The refractory packing is disposed in the molten metal bath to restrict the flow of waste and waste dissociation products through the molten metal and around the refractory packing to tortuous flow paths.

Claims

1. A method for dissociating waste in a molten metal bath into atomic constituents and reformulating said constituents into products contained in at least one phase, comprising the steps of:

a) forming the molten metal bath in a reactor;

b) introducing a refractory packing into the molten metal bath in said reactor to form a refractory packed bed; and

subsequently

c) introducing waste into said molten metal bath, wherein said molten metal bath contains the packed bed, whereby the waste dissociates to said atomic constituents and whereby said atomic constituents reformulate into products contained in at least one phase.

2. A method of claim 1 wherein said refractory packed bed comprises uranium dioxide.

3. A method of claim 1 wherein said refractory packed bed comprises a mixture of calcium oxide and uranium dioxide.

4. A method of claim 2 further comprising the step of introducing an oxidizing agent into said molten metal bath.

5. A method of claim 4 wherein the oxidizing agent comprises oxygen.

6. A method of claim 1 further comprising the step of directing the product in a gaseous phase through a second refractory packed bed in said reactor, said second refractory packing removing a chemical or physical impurity from said product.

7. A method of claim 6 wherein said second refractory packed bed in reactive with a constituent of the waste introduced into the molten metal bath.

8. A method of claim 7 wherein said second refractory packed bed floats above said first packed bed.

9. A method of claim 8 wherein said second refractory packed bed comprises calcium oxide.

10. A method of claim 5 wherein said molten metal bath comprises iron.

11. A method of claim 5 wherein the molten metal bath is comprised of a metal selected to provide an increased molar ratio of carbon dioxide/carbon monoxide compared to that produced in molten iron under the same conditions.

12. A method of claim 5 wherein the molten metal comprises manganese.

13. A method of claim 5 wherein the molten metal bath comprises two immiscible metals having a first immiscible metal having a free energy of oxidation, at the conditions of the molten metal bath, greater than that of oxidation of atomic carbon to form carbon monoxide and a second immiscible metal having a free energy of oxidation, at the conditions of the molten metal bath, greater than that of oxidation of carbon monoxide to form carbon dioxide.

14. A method of claim 13 wherein said molten metal bath comprises an immiscible mixture of iron and copper.

15. A method of claim 5 wherein the reactor further includes a vitreous layer which is disposed above the molten metal bath, for removing at least a portion of an impurity from a gaseous product.

16. A method for dissociating organic waste in a molten metal bath into its atomic constituents and reformulating said constituents into products contained in at least one phase, comprising the steps of:

a) forming the molten metal bath in a reactor;

b) introducing uranium dioxide packing into said molten metal bath to form a refractory packed bed;

c) subsequently introducing organic waste into said molten metal bath whereby the organic waste dissociates to generate hydrogen gas and to carbonize the molten metal bath; and

d) adding an oxidizing agent into said carbonized molten metal bath to generate carbon oxide gas.

17. A method of claim 16 further comprising the step of forming a calcium oxide refractory packed bed in said reactor above the molten metal bath, whereby hydrogen gas and carbon oxide gas discharged from the molten metal bath pass through the calcium oxide refractory packed bed and are purified in said calcium oxide refractory packed bed.

18. A method for volatilizing a volatilizable component of waste in a molten metal bath to form a gaseous waste component and a non-gaseous waste component, comprising the steps of:

a) forming the molten metal bath in a reactor;

b) introducing a refractory packing into the molten metal bath in said reactor to form a refractory packed bed; and

subsequently

c) introducing waste into said molten metal bath, wherein said molten metal bath contains the refractory packed bed, whereby the volatilizable waste component volatilizes to form a gaseous waste component and a non-gaseous waste component.