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US3615364A Expired / Lapsed US ⏱️ 0.0 years remaining

Reduction of cuprous cyanide with hydrogen in a liquid medium

Assignee: Treadwell Corp
•
Filing: 1969-10-01
•
Granted: 1971-10-26
•
Expires: 1989-10-01
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Abstract

Abstract Cuprous cyanide is dispersed in a high boiling hydrocarbon oil nonreactive with hydrogen, copper or HCN, such as a paraffin mineral oil, and hydrogen is passed through at temperatures from 190* C. to temperatures at or a little below the boiling point of the oil. With an oil boiling above 325* C., suitable temperatures are from a little below 300* C. to approximately 325* C. Hydrogen is passed through at a rate and for a time to produce a substantial excess, for example at least 50 percent excess, and the cuprous cyanide is reduced almost quantitatively to a very pure copper powder. After reduction is complete, the copper powder is separated from the oil, the last traces of oil being removed by known means, such as solvent washing, or removed when the copper is melted. The excess hydrogen carries with it HCN formed in the reduction, and the two are separated and reused.

Inventors

  • 👤 Irving Rubak

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-06 18:22
CPC Classifications
C; C22; C22B; C22B5/00; Y; Y02; Y02P; Y02P10/00; Y02P10/20

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 26 words
A process according to claim 1 in which the temperature during reaction ranges from about 300* C. to the temperature below at which the oil boils.
Claim 2
Dependent Claim 15 words
A process according to claim 2 in which the oil is a high-boiling paraffin oil.
Claim 3
Dependent Claim 20 words
A process according to claim 3 in which the reaction of hydrogen with cuprous cyanide is at substantially atmospheric pressure.
Claim 4
Dependent Claim 20 words
A process according to claim 2 in which the reaction of hydrogen with cuprous cyanide is at substantially atmospheric pressure.
Claim 5
Dependent Claim 45 words
A process according to claim 2 in which the hydrogen and hydrocyanic acid gases produced by the reaction are cooled down and are separated from each other and oil vapor, the cooling being effected by heat exchange with separated hydrogen, whereby the latter is preheated.
Claim 6
Dependent Claim 45 words
A process according to claim 3 in which the hydrogen and hydrocyanic acid gases produced by the reaction are cooled down and are separated from each other and oil vapor, the cooling being effected by heat exchange with separated hydrogen, whereby the latter is preheated.
Claim 7
Dependent Claim 45 words
A process according to claim 4 in which the hydrogen and hydrocyanic acid gases produced by the reaction are cooled down and are separated from each other and oil vapor, the cooling being effected by heat exchange with separated hydrogen, whereby the latter is preheated.
Claim 8
Dependent Claim 45 words
A process according to claim 5 in which the hydrogen and hydrocyanic acid gases produced by the reaction are cooled down and are separated from each other and oil vapor, the cooling being effected by heat exchange with separated hydrogen, whereby the latter is preheated.
Claim 9
Dependent Claim 94 words
A continuous process according to claim 2 in which the suspension of cuprous cyanide is introduced into a first reaction vessel through which the hydrogen is passed, excess hydrogen and HCN are removed, and the suspension of partially reduced cuprous cyanide in oil is overflowed into a succeeding reactor through which further hydrogen is passed and overflow repeated to further reactors in series until the cuprous cyanide is substantially completely reduced in the last reactor and the suspension of copper in oil is overflowed from the last reactor and the copper separated and recovered.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-10-25 1975-04-26 1975-10-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-10-25 1979-04-26 1979-10-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-10-25 1983-04-26 1983-10-26 $7700.00 Window Closed / Lapsed

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