Preparation of chrome yellow and molybdate orange pigments

Details Preparation of chrome yellow and molybdate orange pigments Preparation of chrome yellow and molybdate orange pigments

C - Chemistry, Metallurgy

09

C

C09C 1/20 (2006.01) B01D 61/44 (2006.01) C25B 1/16 (2006.01) C25B 1/22 (2006.01)

Patent

CA 2041864

O.Z. 0050/41591 Abstract of the Disclosure: Chrome yellow/molybdate orange pigments are prepared with reuse of the nitric acid and sodium hydroxide by electrochemically splitting the sodium nitrate solution obtained in the pigment synthesis into sodium hydroxide and nitric acid in a three-divided elec- trolysis cell where the central compartment, which contains the sodium nitrate, is separated from the cathode space by a cation exchange membrane and from the anode space by an anion exchange membrane, and using the nitric acid for preparing lead nitrate from lead oxide and the sodium hydroxide for making sodium aluminate from aluminum hyd- roxide and for setting the pH.

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