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    PROCESS FOR PURIFYING A SODIUM SULFATE RESIDUE
    94.
    发明申请
    PROCESS FOR PURIFYING A SODIUM SULFATE RESIDUE 审中-公开

    公开(公告)号：WO2020233558A1

    公开(公告)日：2020-11-26

    申请号：PCT/CN2020/090982

    申请日：2020-05-19

    Applicant: SOLVAY SA

    Inventor： WOOD, Michael ,  WANG, Yan ,  BEDEL, Sabrina ,  CRIADO, Claude ,  WANG, Aiping

    IPC: C01D5/16

    Abstract: Provided is a process for purifying a sodium sulfate residue comprising sodium sulfate, sodium carbonate and sodium chloride, and optionally insoluble matter. The process comprises: (a) dissolving the residue with a first aqueous solution to obtain a first aqueous suspension comprising at least 5 wt% and at most 32 wt% of sodium sulfate; (b) optionally separating the insoluble matter from the first aqueous suspension to obtain a separated insoluble matter and a second aqueous solution; (c1) acidifying the second aqueous solution with sulfuric acid to a pH of less than 6 so as to transform at least part or all of dissolved sodium carbonate to sodium sulfate; (c2) optionally aerating the acidified second aqueous solution with oxygen or air to convert sulfites to sulfates; (c3) alkalinizing the acidified second aqueous solution to a pH of about 7 or more with an alkali; (d) removing part of the water from the second aqueous solution to obtain a mother liquor and to crystallize sodium sulfate; (f) purging part of the mother liquor and recycling part of the non-purged mother liquor in at least one of the steps (a) to (d), wherein a weight ratio of the purged separated mother liquor to the non-purged separated mother liquor is at most 0.20 t/t. Also provided is a use of sodium sulfate particles obtained from the process.

    PARTICLES COMPRISING HYDROXYAPATITE, PROCESS FOR MAKING AND THEIR USE
    98.
    发明申请
    PARTICLES COMPRISING HYDROXYAPATITE, PROCESS FOR MAKING AND THEIR USE 审中-公开

    公开(公告)号：WO2020128021A1

    公开(公告)日：2020-06-25

    申请号：PCT/EP2019/086762

    申请日：2019-12-20

    Applicant: SOLVAY SA

    Inventor： DELPLANCHE, Thierry ,  ORTEGO, Beatrice ,  CAPRASSE, Michel

    IPC: B01J20/04 ,  B01J20/02 ,  B01J20/06 ,  B01J20/20 ,  B01J20/32 ,  B01D53/04 ,  C01B25/32 ,  C02F1/28 ,  B01J20/10 ,  B01J20/28 ,  B01J20/30

    Abstract: Solid particles which comprises a hydroxyapatite and secondary particles. The hydroxyapatite and secondary particles may form agglomerates and/or coreshells in which the hydroxyapatite is in a shell that covers at least partially the secondary particles. The hydroxyapatite may be calcium-deficient, may be a modified hydroxyapatite onto which an additive is deposited and/or a hydroxyapatite composite into which an additive is incorporated or embedded. Preferred processes for making the solid particles may comprise: an acid attack of a Ca source with phosphoric acid at an acidic pH to make brushite followed by an alkaline maturation step to convert brushite to hydroxyapatite and using a source of secondary particles in the first step and/or in the second step to make the solid particles. The secondary particles may comprise water-insoluble chemical substance(s), such as preferably calcium carbonate, silica, alumina, a calcium phosphate with a Ca/P molar ratio from 1.5 to 1.7 and/or a bone char, more preferably calcium carbonate and/or bone char. An adsorbent comprising said solid particles and use thereof in removing contaminants from a fluid.

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