Regeneration of cupric etchants and recovery of copper sulfate

Details Regeneration of cupric etchants and recovery of copper sulfate Regeneration of cupric etchants and recovery of copper sulfate

2007-02-13

2007-02-13

Vanoy, Timothy C. (Department: 1754)

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ib metal

C423S034000, C423S036000, C423S041000, C423S045000, C423S482000, C423S488000, C423S557000, C203S035000, C422S001000, C252S380000, C424S637000

Reexamination Certificate

active

11071108

ABSTRACT:
Spent, acidic solutions comprising cupric chloride and hyrdrochloric acid from the copper etching process are regenerated by a process in which the acid is subjected to distillation with sulfuric acid. In one embodiment, the process comprises (a) providing a spent etchant comprising at least about 10% by weight chloride and at least about 5% dissolved copper; (b) adding at least about 2 moles of sulfuric acid per mole of dissolved copper to the spent etching solution, thereby converting copper chloride into hydrochloric acid and precipitated copper sulfate; (c) distilling the mixture from step (b) to vaporize at least a portion of the hydrochloric acid; (d) condensing at least a portion of the vaporized hydrochloric acid; (e) separating at least a portion of the precipitated copper sulfate from the residual liquid, wherein said residual liquid comprises sulfuric acid; and (f) reusing at least a portion of the residual liquid as a sulfuric acid source in step (b).

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