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    Process for the production of sodium carbonate anhydrate
    4.
    发明授权
    Process for the production of sodium carbonate anhydrate 失效
    生产无水碳酸钠的方法

    公开(公告)号：US06514475B1

    公开(公告)日：2003-02-04

    申请号：US09203270

    申请日：1998-12-01

    申请人： Harald Oosterhof ,  Gerda Maria van Rosmalen ,  Geert-Jan Witkamp ,  Johannes de Graauw

    发明人： Harald Oosterhof ,  Gerda Maria van Rosmalen ,  Geert-Jan Witkamp ,  Johannes de Graauw

    IPC分类号： C01D700

    CPC分类号： C01D7/37 ,  C01D7/12 ,  C01D7/24 ,  C01D7/35

    摘要： The invention is directed to a process for the production of sodium carbonate-anhydrate having a bulk density of at least 800 kg/m3, said process comprising: providing a suspension of solid sodium carbonate and/or solid sodium bicarbonate and/or solid double salts at least comprising one of sodium carbonate and sodium bicarbonate, in a mixture containing water and an organic, water miscible or partly water miscible solvent, which solvent influences the transition temperature below which sodium carbonate monohydrate is stable, whereby the type and the amount of solvent is selected in such way that the said transition temperature is below the boiling point of the said mixture of water and an organic, water miscible or partly water miscible solvent, in case sodium bicarbonate is present, converting the bicarbonate into carbonate, crystallising sodium carbonate anhydrate from said mixture at a temperature above the said transition temperature and below the said boiling point, and recovering the sodium carbonate anhydrate.

    摘要翻译： 本发明涉及生产体积密度为至少800kg / m 3的无水碳酸钠的方法，所述方法包括：提供固体碳酸钠和/或固体碳酸氢钠和/或固体双重盐的悬浮液 至少包含碳酸钠和碳酸氢钠之一，在含水和有机，水混溶或部分水混溶性溶剂的混合物中，该溶剂影响低于该转化温度的碳酸钠一水合物是稳定的，由此溶剂的类型和量 选择以使得所述转变温度低于所述水混合物和有机的，水混溶性的或部分水混溶性溶剂的沸点，在存在碳酸氢钠的情况下，将碳酸氢盐转化为碳酸盐，结晶的碳酸钠水合物 在高于所述转变温度并低于所述沸点的温度下从所述混合物中回收 e碳酸钠无水物。

    Preparation of sodium carbonate anhydride
    5.
    发明授权
    Preparation of sodium carbonate anhydride 失效
    碳酸酐酐的制备

    公开(公告)号：US4252781A

    公开(公告)日：1981-02-24

    申请号：US26449

    申请日：1979-04-02

    申请人： Yosisige Fujita ,  Shigeki Ishine ,  Kazuyoshi Morita

    发明人： Yosisige Fujita ,  Shigeki Ishine ,  Kazuyoshi Morita

    IPC分类号： C01D7/12 ,  C01D7/37

    CPC分类号： C01D7/37 ,  C01D7/12

    摘要： A thick suspension of sodium carbonate anhydride is obtained by countercurrent contacting of a high pressure steam and a suspension of sodium bicarbonate or sodium sesquicarbonate in a concentrated solution of sodium carbonate. The decomposition reaction is promoted to near completion by maintaining the reaction temperature above 150.degree. C. to realize a high HCO.sub.3.sup.- ion concentration in the solution. The sodium carbonate anhydride suspension is cooled to cause transition of the anhydride to the monohydrate, followed by the separation of the crystalline monohydrate from the mother liquor. Calcination of this monohydrate gives a dense soda ash featuring a high purity and a uniform particle size, while the mother liquor is recycled for the preparation of the sodium bicarbonate suspension.

    摘要翻译： 通过高压蒸汽和碳酸氢钠或倍半碳酸钠的混悬液在碳酸钠浓缩液中的逆流接触获得浓碳酸酐酐的浓悬浮液。 通过保持反应温度高于150℃，使分解反应促进到接近完成，以在溶液中实现高HCO3-离子浓度。 将碳酸钠酸酐悬浮液冷却以使酸酐转化为一水合物，然后从母液中分离结晶一水合物。 该一水合物的煅烧产生具有高纯度和均匀粒度的致密苏打灰，同时将母液循环用于制备碳酸氢钠悬浮液。

    Soluble silicate reduction in calcined trona liquors
    6.
    发明授权
    Soluble silicate reduction in calcined trona liquors 失效
    煅烧天然碱液中的可溶性硅酸盐还原

    公开(公告)号：US4021526A

    公开(公告)日：1977-05-03

    申请号：US587585

    申请日：1975-06-17

    申请人： Alan B. Gancy ,  Rustom P. Poncha

    发明人： Alan B. Gancy ,  Rustom P. Poncha

    IPC分类号： C01D7/37 ,  C01D7/00

    CPC分类号： C01D7/37

    摘要： In the process of making sodium carbonate from trona by the method involving crushing the trona, calcining it and dissolving it in an aqueous medium for purification by crystallization, soluble silicate contamination of the crystallization liquor is reduced by an improvement which involves: (a) segregating the calcined trona into a coarse and a fine fraction; (b) separately dissolving the coarse and fine fractions to obtain aqueous solutions of sodium carbonate, sodium silicates and insoluble impurities; (c) optionally adding to the solution of the fine fraction insoluble impurities which have been separated from a solution of such fine fraction in a previous operation; followed by (d) digesting the solution of the fine fraction containing added insolubles at elevated temperature to insolubilize soluble silicates and separating the digested solution from insoluble impurities.

    摘要翻译： 在通过包括粉碎天然碱的方法制备碳酸钠的过程中，将其煅烧并将其溶解在水性介质中以通过结晶进行纯化，结晶液的可溶性硅酸盐污染通过改进降低，其包括：（a）分离 将煅烧的天然碱变成粗和细级分; （b）分别溶解粗细级分，得到碳酸钠，硅酸钠和不溶性杂质的水溶液; （c）任选地在以前的操作中向已经从这种细级分溶液中分离出的细小级不溶性杂质溶液中加入; 然后（d）在升高的温度下将含有不溶物的细小级分的溶液消化，使可溶性硅酸盐不溶解并将消化的溶液与不溶性杂质分离。