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    Production of crystalline sodium bicarbonate
    95.
    发明授权
    Production of crystalline sodium bicarbonate 有权

    公开(公告)号：US10766782B2

    公开(公告)日：2020-09-08

    申请号：US15761896

    申请日：2016-09-22

    Applicant: Solvay SA

    Inventor： James C. Kisielewski ,  David M. Hansen ,  Keith O. Hayes ,  Mayra Muci-Castaneda ,  Alain Vandendoren

    IPC: C01D7/40 ,  C01D7/10 ,  C01D7/24

    Abstract: A process for producing crystalline sodium bicarbonate, comprising: providing an aqueous sodium-bicarbonate containing liquor originating from a reactive crystallization step in which first sodium bicarbonate crystals are produced and recovered; feeding at least a portion of said aqueous sodium-bicarbonate containing liquor to a cooling crystallization unit to form second sodium bicarbonate crystals and produce a crystals slurry comprising the second sodium bicarbonate crystals; and withdrawing a portion of the crystals slurry from the cooling crystallization unit for the withdrawn second sodium bicarbonate crystals to be further processed. A portion of the second sodium bicarbonate crystals withdrawn from the cooling crystallization unit may be fed to a sodium bicarbonate reactive crystallization unit, to a caustic unit, or may be separated and dried. The reactive crystallization, separation and/or drying units where the second sodium bicarbonate crystals are further processed may be the same units where the first sodium bicarbonate crystals are processed.

    Gas separation unit comprising a rotor with a plurality of sectors and a stator
    96.
    发明授权
    Gas separation unit comprising a rotor with a plurality of sectors and a stator 有权

    公开(公告)号：US10744448B2

    公开(公告)日：2020-08-18

    申请号：US15741313

    申请日：2016-07-01

    Applicant: SOLVAY SA

    Inventor： Eric Pierre Dubois ,  David Jean Lucien Savary ,  Jean-Paul Coquerel

    IPC: B01D53/06 ,  B01D53/04

    Abstract: Gas separation unit for separation of a gas component from a process gas stream, said separation unit comprising a stator and a rotor comprising a plurality of sectors, each sector containing a separation device arranged to separate the gas component from the process gas stream which is led into the separation device and each sector being fluidically connected with at least one valve. The valve is a rotary active valve which comprises a rotor open area which is located at the rotor and a stator open area which is located at the stator. The rotor open area and the stator open area can overlap and can be laterally separated from each other by rotation of the rotor relative to the stator. In this way, the valve can at least partially be opened and closed. The extent of overlap of the rotor open area and the stator open area defines the extent of opening and closing of the valve, respectively. The extent of overlap corresponds to the extent of partial opening of the valve.

    Multi-pollutant gas purification process with alkali sorbent and deNOx supported catalyst comprising Ca-deficient hydroxyapatite
    98.
    发明授权
    Multi-pollutant gas purification process with alkali sorbent and deNOx supported catalyst comprising Ca-deficient hydroxyapatite 有权

    公开(公告)号：US10661226B2

    公开(公告)日：2020-05-26

    申请号：US16464069

    申请日：2017-12-07

    Applicant: Solvay SA

    Inventor： Thierry Delplanche ,  Antonella Gervasini

    IPC: B01D53/86 ,  B01J23/00 ,  B01J23/02 ,  B01J23/72 ,  B01J35/10 ,  B01D53/50 ,  B01J37/30

    Abstract: Process for treating a combustion waste gas stream containing NOx and contaminants such as heavy metals and/or acid gases, e.g., halogens, SOx, comprising: injecting an alkali sorbent, into the waste gas stream; removing some contaminants with the alkali sorbent from the waste gas stream; injecting an ammonia source into the gas stream; injecting a deNOx catalyst into the gas stream at a temperature of 100° C. to preferably not more than 600° C. to reduce with NH3, in the presence of O2, some NOx to N2 and water in the gas stream, wherein the deNOx catalyst comprises copper and/or copper oxide deposited on a porous support comprising at least 60 wt % of a calcium-deficient hydroxyapatite having a Ca/P of less than 1.67. A blend comprising the alkali sorbent and the deNOx catalyst may be formed to inject them together into the waste gas stream. The ammonia source and the deNOx catalyst are preferably injected simultaneously. Alternatively, the ammonia source may be included in the alkali sorbent and/or the deNOx catalyst.

    PLANT FOR HYDROGEN PEROXIDE PRODUCTION AND PROCESS USING IT
    100.
    发明申请
    PLANT FOR HYDROGEN PEROXIDE PRODUCTION AND PROCESS USING IT 审中-公开

    公开(公告)号：US20190388860A1

    公开(公告)日：2019-12-26

    申请号：US16549851

    申请日：2019-08-23

    Applicant: Solvay SA

    Inventor： Stephen Bloomfield ,  Patrick Markus Dhaese

    IPC: B01J10/00 ,  C01B15/023 ,  B01J19/00

    Abstract: An autoxidation process for producing hydrogen peroxide may be performed using a plant that includes at least two skid mounted modules selected from: a skid mounted module comprising at least one hydrogenator to hydrogenate an anthraquinone in a working solution; a skid mounted module comprising at least one oxidizer to oxidize the hydrogenated anthraquinone with oxygen to form hydrogen peroxide; optionally a skid mounted module configured to compress air to feed oxygen into the at least one oxidizer of the oxidizer skid, and when said air compressor skid is present, a further skid mounted module configured to recover solvent; a skid mounted module configured to extract the hydrogen peroxide from the working solution; and a skid mounted module comprising at least one means to deliver a hydrogen peroxide solution to a point of use and/or optionally to a storage tank.

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