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    2.
    发明专利
    未知

    公开(公告)号：IT1145370B

    公开(公告)日：1986-11-05

    申请号：IT4880380

    申请日：1980-05-27

    Applicant: DIAMOND SHAMROCK CORP

    Inventor： SHUSTER NICHOLAS ,  BABINSKY ANDREW DANIEL

    IPC: C25B1/22 ,  C25B

    Abstract: Chromic acid is now efficiently prepared in a process using dichromate, such as the dichromate typically available as an intermediate in the chromic acid production from chrome ore. In the process, the dichromate is introduced into the center compartment of a three-compartment electrolytic cell and dichromate-containing center compartment electrolyte flows through a porous diaphragm into the anode compartment of the cell. Electrolyte is introduced to the cell cathode compartment which is separated from the center compartment by a substantially hydraulically impermeable cation-exchange membrane means. During electrolysis, chromic acid is prepared in the anolyte and alkali product is produced in the catholyte.

    PRODUCTION OF CHROMIC ACID
    3.
    发明专利
    PRODUCTION OF CHROMIC ACID 未知

    公开(公告)号：AU534996B2

    公开(公告)日：1984-02-23

    申请号：AU5878980

    申请日：1980-05-27

    Applicant: DIAMOND SHAMROCK CORP

    Inventor： KIDON WILLIAM EDWARD ,  SHUSTER NICHOLAS ,  BABINSKY ANDREW DANIEL

    IPC: C25B1/00 ,  C25B1/16 ,  C25B1/22 ,  C25B1/14

    Abstract: Chromic acid is now produced in simplified processing that also reduces acid contaminants, while using the alkali metal chromate typically available at an early stage in chromic acid production from chrome ore. In the process, chromate is converted to dichromate in the anode compartment of either a two-compartment, or three-compartment, electrolytic cell. During electrolysis, metal ion contamination is reduced. Withdrawn anolyte from this first cell may then be concentrated. The dichromate feed, possibly concentrated, is then introduced to the center compartment of a three-compartment electrolytic cell and flows through a porous diaphragm to the anode compartment of the cell. The anolyte from this later electrolytic cell, rich in chromic acid, can be concentrated, cooled, and the chromic acid recovered. Liquid removed from chromic acid recovery can be recycled. Alkali product is produced in the cathode compartment of each cell.

    4.
    发明专利
    未知

    公开(公告)号：DE3020261A1

    公开(公告)日：1980-12-11

    申请号：DE3020261

    申请日：1980-05-28

    Applicant: DIAMOND SHAMROCK CORP

    Inventor： SHUSTER NICHOLAS ,  BABINSKY ANDREW DANIEL

    IPC: C25B1/22 ,  C01G37/033

    Abstract: Chromic acid is now efficiently prepared in a process using dichromate, such as the dichromate typically available as an intermediate in the chromic acid production from chrome ore. In the process, the dichromate is introduced into the center compartment of a three-compartment electrolytic cell and dichromate-containing center compartment electrolyte flows through a porous diaphragm into the anode compartment of the cell. Electrolyte is introduced to the cell cathode compartment which is separated from the center compartment by a substantially hydraulically impermeable cation-exchange membrane means. During electrolysis, chromic acid is prepared in the anolyte and alkali product is produced in the catholyte.

    CHROMIC ACID PRODUCTION
    8.
    发明专利
    CHROMIC ACID PRODUCTION 未知

    公开(公告)号：AU527615B2

    公开(公告)日：1983-03-10

    申请号：AU5879180

    申请日：1980-05-27

    Applicant: DIAMOND SHAMROCK CORP

    Inventor： SHUSTER NICHOLAS ,  BABINSKY ANDREW DANIEL ,  KIDON WILLIAM EDWARD

    IPC: C25B1/22 ,  C25B1/16

    Abstract: Chromic acid production is now simplified in a process using the concentrated dichromate typically available at an intermediate stage when chromic acid is produced from chrome ore. In the process, the dichromate is treated in a three-compartment cell as, for example, after removal of the sulfate or carbonate salt evolved in the overall production process. The dichromate feed enters the center compartment of the three-compartment cell and then flows through a porous diaphragm to the anode compartment of the cell and is electrolyzed at elevated current density. Depleted feed solution may be withdrawn from the center compartment and recirculated for reuse. Concentrated, water-white alkali product is produced in the cathode compartment. The anolyte from the cell, rich in chromic acid, can be concentrated, cooled, and the chromic acid recovered. Liquid removed from chromic acid recovery can be recirculated for subsequent electrolysis, as by combination with the feed. Both alkali product and anolyte chromic acid can be produced at enhanced current efficiency.

    9.
    发明专利
    未知

    公开(公告)号：IT8048802D0

    公开(公告)日：1980-05-27

    申请号：IT4880280

    申请日：1980-05-27

    Applicant: DIAMOND SHAMROCK CORP

    Inventor： KIDON WILLIAM EDWARD ,  SHUSTER NICHOLAS ,  BABINSKY ANDREW DANIEL

    IPC: C25B1/16 ,  C25B1/00 ,  C25B1/22 ,  C25B

    Abstract: Chromic acid is now produced in simplified processing that also reduces acid contaminants, while using the alkali metal chromate typically available at an early stage in chromic acid production from chrome ore. In the process, chromate is converted to dichromate in the anode compartment of either a two-compartment, or three-compartment, electrolytic cell. During electrolysis, metal ion contamination is reduced. Withdrawn anolyte from this first cell may then be concentrated. The dichromate feed, possibly concentrated, is then introduced to the center compartment of a three-compartment electrolytic cell and flows through a porous diaphragm to the anode compartment of the cell. The anolyte from this later electrolytic cell, rich in chromic acid, can be concentrated, cooled, and the chromic acid recovered. Liquid removed from chromic acid recovery can be recycled. Alkali product is produced in the cathode compartment of each cell.

    10.
    发明专利
    未知

    公开(公告)号：IT8048801D0

    公开(公告)日：1980-05-27

    申请号：IT4880180

    申请日：1980-05-27

    Applicant: DIAMOND SHAMROCK CORP

    Inventor： SHUSTER NICHOLAS ,  BABINSKY ANDREW DANIEL ,  KIDON WILLIAM EDWARD

    IPC: C25B1/22 ,  C25B

    Abstract: Chromic acid production is now simplified in a process using the concentrated dichromate typically available at an intermediate stage when chromic acid is produced from chrome ore. In the process, the dichromate is treated in a three-compartment cell as, for example, after removal of the sulfate or carbonate salt evolved in the overall production process. The dichromate feed enters the center compartment of the three-compartment cell and then flows through a porous diaphragm to the anode compartment of the cell and is electrolyzed at elevated current density. Depleted feed solution may be withdrawn from the center compartment and recirculated for reuse. Concentrated, water-white alkali product is produced in the cathode compartment. The anolyte from the cell, rich in chromic acid, can be concentrated, cooled, and the chromic acid recovered. Liquid removed from chromic acid recovery can be recirculated for subsequent electrolysis, as by combination with the feed. Both alkali product and anolyte chromic acid can be produced at enhanced current efficiency.

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