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    Improved alkali regeneration process
    3.
    发明公开
    Improved alkali regeneration process 失效
    一种用于苛性碱再生过程。

    公开(公告)号：EP0090568A1

    公开(公告)日：1983-10-05

    申请号：EP83301541.5

    申请日：1983-03-18

    申请人： AUSTRALIAN PAPER MANUFACTURERS LIMITED

    发明人： Nguyen, Kien Loi ,  Keogh, Andrew Joseph ,  Covey, Geoffrey Harold

    IPC分类号： C01D1/04 ,  C01D1/28 ,  C01D1/42 ,  D21C11/04 ,  F23G7/04

    CPC分类号： C01D1/04 ,  D21C11/04

    摘要： The invention relates to an improvement in a method of regenerating alkaline or alkaline earth metal oxides or hydroxides from solution particularly in delignification processes wherein a suitable transition metal such as ferric oxide is burnt with the solution to produce a mixed oxide that is subsequently treated in hot water to regenerate the alkaline or alkaline earth metal oxide or hydroxide and precipitate the transition metal oxide. The improvement controls the presence of fines in the transition metal oxide to maintain these at an acceptable level in the fluidized bed combustion zone. This is achieved by contacting the fines with spent liquor from a delignification process.
    The invention also provides for the pelletization of the fine material of the transition metal oxide and spent delignification liquor can be used as a binder in the formation of such pellets.

    CATHOLYTE HEAT RECOVERY EVAPORATOR AND METHOD OF USE
    7.
    发明公开
    CATHOLYTE HEAT RECOVERY EVAPORATOR AND METHOD OF USE 审中-公开
    几何热回收蒸发器及使用方法

    公开(公告)号：EP2321223A4

    公开(公告)日：2013-05-22

    申请号：EP09805287

    申请日：2009-08-07

    申请人： WESTLAKE VINYL CORP

    发明人： DAVIS ANTHONY B ,  YOHE THOMAS H ,  DUNN RUSSEL F

    IPC分类号： C01D1/42 ,  B01D1/26 ,  C01D1/40 ,  C25B1/00 ,  C25B15/08

    CPC分类号： C25B15/08 ,  B01D1/26 ,  C01D1/40 ,  C01D1/42 ,  C02F1/048 ,  C25B1/16 ,  C25B1/46 ,  Y02P20/124 ,  Y02P20/57 ,  Y02P70/34

    摘要： A method for concentrating an aqueous caustic alkali produced by a membrane cell process by using a single or multiple effect evaporator system in which the vapor flows in a counter direction to the aqueous caustic alkali flow and the heat recovered from the catholyte circulation line is used as part of the concentration process. In one embodiment, a catholyte heat recovery heat exchanger and evaporation chamber are located after the last effect of a multiple effect evaporator system. In another embodiment, the catholyte heat recovery heat exchanger and evaporation chamber are located prior to the single or multiple effect evaporator system. In yet another embodiment, the catholyte heat recovery process is used in conjunction with additional heat exchanger processes to further concentrate the final product as desired.

    PROCESS FOR TREATING A SODIUM CARBONATE PURGE
    9.
    发明公开
    PROCESS FOR TREATING A SODIUM CARBONATE PURGE 审中-公开

    公开(公告)号：EP3971138A1

    公开(公告)日：2022-03-23

    申请号：EP21178120.8

    申请日：2014-11-12

    申请人： Solvay SA

    发明人： VANDENDOREN, Alain

    IPC分类号： C01D7/24 ,  C01D7/12 ,  C01D1/42 ,  C01D1/22

    摘要： A method for treating a purge stream derived from a sodium carbonate, sesquicarbonate, wegsheiderite, or bicarbonate crystallizer, said purge stream comprising sodium carbonate and/or sodium bicarbonate and at least 1 % by weight of sodium chloride and/or sodium sulfate, the method comprising :
    - causticizing at least 50 mol. % of the sodium from sodium carbonate and/or sodium bicarbonate into a caustic solution and into a calcium carbonate mud with lime and water,
    - separating the calcium carbonate mud from the caustic solution;
    - concentrating the caustic solution by removing part of the water to obtain a concentrated caustic solution comprising at least 25 % NaOH, and a crystallized solid comprising sodium carbonate and sodium chloride and/or sulfate,
    - separating the crystallized solid from the concentrated caustic solution, said crystallized solid to be disposed of or to be further valorized,
    - recycling part of the concentrated caustic solution to the sodium carbonate, sesquicarbonate, wegsheiderite, or bicarbonate crystallizer.

    CONCENTRATED AQUEOUS SODIUM HYDROXIDE SOLUTION AND PROCESS FOR TREATING A SODIUM CARBONATE PURGE
    10.
    发明公开
    CONCENTRATED AQUEOUS SODIUM HYDROXIDE SOLUTION AND PROCESS FOR TREATING A SODIUM CARBONATE PURGE 审中-公开
    浓缩水性氢氧化钠溶液和处理碳酸钠净化液的方法

    公开(公告)号：EP3196165A1

    公开(公告)日：2017-07-26

    申请号：EP17156015.4

    申请日：2014-11-12

    申请人： Solvay SA

    发明人： VANDENDOREN, Alain

    IPC分类号： C01D7/24 ,  C01D7/12 ,  C01D1/42 ,  C01D1/22

    CPC分类号： C01D1/42 ,  C01D1/22 ,  C01D7/126 ,  C01D7/14 ,  C01D7/24 ,  C22B26/10

    摘要： Concentrated aqueous sodium hydroxide solution comprising: at least 25 wt % NaOH, and at least one soluble salt, said soluble salt comprising at least one of the following elements: As, Ba, B, Ca, Co, K, Li, Mg, Mo, P, Pb, Se, Si, Sr, Te, Tl, Ti, V, W, and the at least one of said elements being in specific concentrations ranges. And a process for producing such concentrated aqueous sodium hydroxide solution by treating a purge stream comprising sodium carbonate or bicarbonate.

    摘要翻译： 浓氢氧化钠水溶液，其包含：至少25重量％的NaOH和至少一种可溶性盐，所述可溶性盐包含以下元素中的至少一种：As，Ba，B，Ca，Co，K，Li，Mg，Mo ，P，Pb，Se，Si，Sr，Te，Tl，Ti，V，W和至少一种所述元素处于特定的浓度范围内。 以及通过处理包含碳酸钠或碳酸氢钠的清洗流来生产这种浓缩氢氧化钠水溶液的方法。