Method of silvery recovery from color photographic processing
AssigneeEastman Kodak Company
InventorsPaul A. Schwartz, Valerie L. Kuykendall, Leif P. Olson, Susan M. Flavin, Dominick Vacco, Dennis M. Long, Jay E. Mathewson
Life of this patent
Estimating the term…
Abstract
Silver is recovered from aqueous silver-bearing compositions such as seasoned photographic bleach-fixing compositions or other photoprocessing effluent that comprise certain aliphatic or aromatic sulfur-containing compounds that include a —N═C(SH)— group. The presence of these compounds in the silver-bearing compositions provides effective silver recovery, extended life for the silver recovery apparatus, and reduced maintenance.
Claims19
A method of recovering silver metal comprising:
- subjecting an aqueous silver-bearing composition to a silver recovery procedure, said aqueous silver-bearing composition having a pH of from about 3.5 to about 8 and comprising:
- at least 0.02 mol/l of a ferric-ligand photographic bleaching agent,
- at least 0.1 mol/l of a photographic fixing agent, and
- at least 0.01 mmol/l of a sulfur-containing compound represented by one or more of the following Structures I, II, III, IVa, IVb, and V:
- 22
- wherein Q1 represents a group of atoms that are necessary to complete a nitrogen-containing heterocyclic ring, and R1 represents hydrogen, or an alkyl, cycloalkyl, aryl, heterocyclic, or amino group,
- 23
- wherein Q2 represents a group of atoms that are necessary to complete a nitrogen-containing heterocyclic ring, and R2 represents hydrogen, an alkali metal atom, a
- 24
- group wherein Q3 is defined the same as Q2, or an alkyl group,
- 25
- wherein R3 and R4 are independently alkyl, cycloalkyl, alkenyl, alkynyl, aralkyl, aryl, or heterocyclic groups, or R4 can be hydrogen, and Y is —O—, —S—, or —N(R5)— wherein R5 is an alkyl, cycloalkyl, alkenyl, alkynyl, aryl, heterocyclic, amino, acylamino, sulfonamido, ureido, or sulfamoylamino group, or R3 and R4, or R4 and R5, taken together, independently, may form a heterocyclic ring,
- 26
- wherein R6, R7, and R8 independently represent hydrogen, alkali metal ions, or alkyl, cycloalkyl, alkenyl, alkynyl, aralkyl, aryl, heterocyclic, amino, acylamino, ureido, or sulfamoylamino groups, and
- 27
- wherein R9, R10, R11 and R12 independently represent hydrogen, alkali metal ions, or alkyl, cycloalkyl, alkenyl, alkynyl, aralkyl, aryl, heterocyclic, amino, acylamino, ureido, or sulfamoylamino groups, and R13 represents an alkyl, cycloalkyl, alkenyl, alkynyl, aralkyl, aryl, heterocyclic, amino, acylamino, ureido, or sulfamoylamino group.
A method of providing a color photographic image comprising:
- A) contacting a color developed photographic color paper with a photographic bleach-fixing composition that has a pH of from about 3.5 to about 8 and comprises:
- at least 0.02 mol/l of a ferric-ligand photographic bleaching agent,
- at least 0.1 mol/l of a photographic fixing agent, and
- at least 0.01 mmol/l of a sulfur-containing compound represented by one or more of the following Structures I, II, III, IVa, IVb, and V:
- 30
- wherein Q1 represents a group of atoms that are necessary to complete a substituted or unsubstituted nitrogen-containing heterocyclic ring, and R1 represents hydrogen, or an alkyl, cycloalkyl, aryl, heterocyclic, or amino group,
- 31
- wherein Q2 represents a group of atoms that are necessary to complete a substituted or unsubstituted nitrogen-containing heterocyclic ring, and R2 represents hydrogen, an alkali metal atom, a
- 32
- group wherein Q3 is defined the same as Q2, or an alkyl group,
- 33
- wherein R3 and R4 are independently alkyl, cycloalkyl, alkenyl, alkynyl, aralkyl, aryl, or heterocyclic groups, or R4 can be hydrogen, and Y is —O—, —S—, or —N(R5)— wherein R5 is an alkyl, cycloalkyl, alkenyl, alkynyl, aryl, heterocyclic, amino, acylamino, sulfonamido, ureido, or sulfamoylamino group, or R3 and R4, or R4 and R5, taken together, independently, may form a heterocyclic ring,
- 34
- wherein R6, R7, and R8 independently represent hydrogen, alkali metal ions, or alkyl, cycloalkyl, alkenyl, alkynyl, aralkyl, aryl, heterocyclic, amino, acylamino, ureido, or sulfamoylamino groups, and
- 35
- wherein R9, R10, R11 and R12 independently represent hydrogen, alkali metal ions, or alkyl, cycloalkyl, alkenyl, alkynyl, aralkyl, aryl, heterocyclic, amino, acylamino, ureido, or sulfamoylamino groups, and R13 represents an alkyl, cycloalkyl, alkenyl, alkynyl, aralkyl, aryl, heterocyclic, amino, acylamino, ureido, or sulfamoylamino group,
- said contacting being carried out for less than 60 seconds, and
- B) after said contacting in step A, recovering silver from said photographic bleach-fixing composition by subjecting said composition to a silver recovery procedure.
A method of recovering silver metal comprising:
- subjecting an aqueous silver-bearing composition to a silver recovery procedure, said aqueous silver-bearing composition comprising at least 0.01 mmol/l of a sulfur-containing compound represented by one or more of the following Structures I, II, III, IVa, IVb, and V:
- 38
- wherein Q1 represents a group of atoms that are necessary to complete a nitrogen-containing heterocyclic ring, and R1 represents hydrogen, or an alkyl, cycloalkyl, aryl, heterocyclic, or amino group,
- 39
- wherein Q2 represents a group of atoms that are necessary to complete a nitrogen-containing heterocyclic ring, and R2 represents hydrogen, an alkali metal atom, a
- 40
- group wherein Q3 is defined the same as Q2, or an alkyl group,
- 41
- wherein R3 and R4 are independently alkyl, cycloalkyl, alkenyl, alkynyl, aralkyl, aryl, or heterocyclic groups, or R4 can be hydrogen, and Y is —O—, —S—, or —N(R5)— wherein R5 is an alkyl, cycloalkyl, alkenyl, alkynyl, aryl, heterocyclic, amino, acylamino, sulfonamido, ureido, or sulfamoylamino group, or R3 and R4, or R4 and R5, taken together, independently, may form a heterocyclic ring,
- 42
- wherein R6, R7, and R8 independently represent hydrogen, alkali metal ions, or alkyl, cycloalkyl, alkenyl, alkynyl, aralkyl, aryl, heterocyclic, amino, acylamino, ureido, or sulfamoylamino groups, and
- 43
- wherein R9, R10, R11 and R12 independently represent hydrogen, alkali metal ions, or alkyl, cycloalkyl, alkenyl, alkynyl, aralkyl, aryl, heterocyclic, amino, acylamino, ureido, or sulfamoylamino groups, and R13 represents an alkyl, cycloalkyl, alkenyl, alkynyl, aralkyl, aryl, heterocyclic, amino, acylamino, ureido, or sulfamoylamino group.
A method of providing a color photographic image comprising:
- A) contacting a color developed photographic color paper with a photographic bleach-fixing composition that has a pH of from about 3.5 to about 8 and is derived from a single-part concentrate that comprises:
- at least 0.1 mol/l of a ferrous ion-ligand photographic bleaching agent precursor,
- at least 0.1 mol/l of a photographic fixing agent, and
- at least 0.00001 mol/l of a sulfur-containing compound represented by one or more of the following Structures I, II, III, IVa, IVb, and V:
- 44
- wherein Q1 represents a group of atoms that are necessary to complete a substituted or unsubstituted nitrogen-containing heterocyclic ring, and R1 represents hydrogen, or an alkyl, cycloalkyl, aryl, heterocyclic, or amino group,
- 45
- wherein Q2 represents a group of atoms that are necessary to complete a substituted or unsubstituted nitrogen-containing heterocyclic ring, and R2 represents hydrogen, an alkali metal atom, a
- 46
- group wherein Q3 is defined the same as Q2, or an alkyl group,
- 47
- wherein R3 and R4 are independently alkyl, cycloalkyl, alkenyl, alkynyl, aralkyl, aryl, or heterocyclic groups, or R4 can be hydrogen, and Y is —O—, —S—, or —N(R5)— wherein R5 is an alkyl, cycloalkyl, alkenyl, alkynyl, aryl, heterocyclic, amino, acylamino, sulfonamido, ureido, or sulfamoylamino group, or R3 and R4, or R4 and R5, taken together, independently, may form a heterocyclic ring,
- 48
- wherein R6, R7, and R8 independently represent hydrogen, alkali metal ions, or alkyl, cycloalkyl, alkenyl, alkynyl, aralkyl, aryl, heterocyclic, amino, acylamino, ureido, or sulfamoylamino groups, and
- 49
- wherein R9, R10, R11 and R12 independently represent hydrogen, alkali metal ions, or alkyl, cycloalkyl, alkenyl, alkynyl, aralkyl, aryl, heterocyclic, amino, acylamino, ureido, or sulfamoylamino groups, and R13 represents an alkyl, cycloalkyl, alkenyl, alkynyl, aralkyl, aryl, heterocyclic, amino, acylamino, ureido, or sulfamoylamino group,
- said contacting being carried out for less than 60 seconds, and
- B) after said contacting in step A, recovering silver from said photographic bleach-fixing composition by subjecting said composition to a silver recovery procedure.
Dependencies are inferred from the claim text.