Cleaning and liquid contact with solids – Processes – Using sequentially applied treating agents
Patent
1991-02-28
1992-07-28
Morris, Theodore
Cleaning and liquid contact with solids
Processes
Using sequentially applied treating agents
134 19, 134 28, 134 29, 134 30, 134 42, 125 39, 252 95, 423446, B01J 304, B08B 308, B08B 310, B28D 504
Patent
active
051337924
ABSTRACT:
The invention teaches a deep boiling process for refining diamonds, be they raw or cut and polished. The process provides for initially precleaning the diamonds with solvents including alcohol, acetone, sulfuric acid, hydrogen peroxide, and/or water, to remove surface oils, hydrocarbons and other common surface impurities therefrom. The process then provides the use of separate sealed vessels wherein the diamonds are respectively submerged in strong caustic and acid solvents, and heated to between 220.degree. and 500.degree. C. with associated high vaporous pressures, for durations of possibly more than a day. The caustic solvent comprises potassium hydroxide and/or sodium hydroxide and possibly also potassium nitrate, and breaks down and removes the "glassy" structures and other complex oxides in the diamonds; while the acid solvent comprises Aqua Regia [hydrocholoric acid and nitric acid] and possibly also sulfuric acid, and removes metallic traces in the diamonds by forming water soluble chlorides and nitrates. The diamonds are rinses, between exposures to the caustic and acid solvents and after the last exposure to either, with solvents including water, acetone and/or alcohol.
Vessels suited to preform this process are also disclosed.
REFERENCES:
patent: 2643661 (1952-06-01), Shanahan, Jr.
patent: 2667434 (1954-01-01), Strandberg
patent: 2961356 (1960-11-01), Breese et al.
patent: 4339281 (1982-07-01), Chio
patent: 4608226 (1986-08-01), Lauvinerie et al.
Purohit Ahnal A.
Purohit Ankur
Anshal, Inc.
El-Arini Zeinab
Lind Charles F.
Morris Theodore
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