Canadian Patent Application No.:  CA  2206217


A closed loop, carbon monoxide self-contained continuous process for the production of nickel or nickel coated objects by the nickel vapour deposition process, comprising placing an object to be treated with nickel carbonyl by said nickel vapour deposition process in a deposition chamber; feeding a gaseous mixture of nickel carbonyl and carbon monoxide to said deposition chamber; depositing nickel on said object to produce said nickel or nickel coated object in said chamber and a nickel carbonyl-depleted gaseous mixture; removing said nickel carbonyl-depleted gaseous mixture from said chamber; removing nickel carbonyl from said nickel carbonyl-depleted gaseous mixture to produce an essentially nickel carbonyl-free gas; feeding said essentially nickel carbonyl-free gas to a nickel carbonyl reactor containing nickel powder to produce a fresh gaseous mixture comprising fresh nickel carbonyl and carbon monoxide; separating said fresh nickel carbonyl from said fresh gaseous mixture to produce a second carbonmonoxide containing gas; and recycling said second carbon monoxide containing gas to said nickel carbonyl reactor. The process and apparatus provides a more economic to operate, safe and more operably reliable than prior art NVD processes.


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