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    PROCESS FOR REDUCING LOSSES OF MERCURY IN THE ALKALI METAL CHLORIDE ELECTROLYSIS
    11.
    发明专利
    PROCESS FOR REDUCING LOSSES OF MERCURY IN THE ALKALI METAL CHLORIDE ELECTROLYSIS 未知

    公开(公告)号：CA1123371A

    公开(公告)日：1982-05-11

    申请号：CA311401

    申请日：1978-09-15

    Applicant: HOECHST AG

    Inventor： BENNINGER SIEGFRIED ,  SCHMIDT ADOLF

    IPC: C25B1/36 ,  C25B15/08

    Abstract: Brine (aqueous solution of alkali metal chlorine) which is electrolyzed according to the amalgamation process, generally contains small amounts of mercury. It has been found that these traces of mercury are entrained to a considerable extent with evaporated water when evaporation cooling is applied to the brine. In order to keep these losses as low as possible, the pH is adjusted to a value of from 7 to 9.8 and the redox potential is adjusted to a vlaue of from 800 to 1100 mV (based on the potential of the hydrogen electrode) by adding chlorine or alkali metal hypochlorite and optionally alkali metal hydroxide to the brine.

    PROCESS AND APPLIANCE FOR THE PRODUCTION OF AQUEOUS SOLUTIONS OF SODIUM CHLORIDE FROM ROCK SALT
    18.
    发明专利
    PROCESS AND APPLIANCE FOR THE PRODUCTION OF AQUEOUS SOLUTIONS OF SODIUM CHLORIDE FROM ROCK SALT 未知

    公开(公告)号：CA1167232A

    公开(公告)日：1984-05-15

    申请号：CA372348

    申请日：1981-03-05

    Applicant: HOECHST AG

    Inventor： BENNINGER SIEGFRIED ,  REINING KARL ,  KRASEL WERNER

    IPC: B01F1/00 ,  C01D3/08

    Abstract: HOE 80/F 043 : Process and appliance for the production of aqueous solutions of sodium chloride from rock salt The invention relates to an open dissolving chamber for rock salt and to a process for the production, free from vapors, of concentrated, aqueous sodium chloride crude brine by continuously dissolving rock salt in this dissolving chamber, The dissolving chamber contains a heap of rock salt with which the brine which is unsaturated in respect of salt comes into contact, The brine thereby becomes saturated with sodium chloride and then passes cut of the dissolving chamber. In the present process, the unsaturated brine enters at the base of the dissolving chamber. The saturated crude brine is removed from the rock salt through at least one vertical or inclined screen which largely holds back suspended rook salt particles. The liquid level of the saturated crude brine in the dissolving chamber should not reach the surface of the heap of rock salt, and the side of the screen facing the interior of the dissolving chamber should be completely covered with a mixture of saturated crude brine and rock salt.

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