公开(公告)号：US09868644B2

公开(公告)日：2018-01-16

申请号：US14367737

申请日：2012-12-19

申请人： SOLVAY SA

发明人： Joffrey Piet ,  Frederic Nicolas

IPC分类号： C01D7/00 ,  C01D7/12 ,  C01D7/22 ,  C01D7/24 ,  C01D7/26 ,  C01D7/32 ,  C01D7/40

CPC分类号： C01D7/126 ,  C01D7/00 ,  C01D7/22 ,  C01D7/24 ,  C01D7/26 ,  C01D7/32 ,  C01D7/40 ,  Y10T428/2982

摘要： Process for producing sodium carbonate and sodium bicarbonate in a continuous mode out of trona comprising: c) feeding crushed trona, an extraction water and an additive in a first leaching tank containing a dissolution solution comprising sodium carbonate and sodium bicarbonate, wherein the additive is selected from the group consisting of: anionic hexametaphosphate, anionic polyphosphate, anionic polyphosphonate, soja lecithine, anionic polycarboxylate polymer, anionic polyacrylate polymer, anionic polyacrylate-polyacrylamide co-polymer, anionic hydrolyzed polymaleic polymers, anionic maleic-acrylic acids copolymers, anionic acrylic acid-phosphonic acid copolymers and combinations thereof; d) dissolving at least partially the crushed trona in the dissolution solution in order to produce a first suspension; e) removing continuously the first suspension from the first leaching tank and feeding it with an additive into a second leaching tank wherein the additive is selected from the same group of additives of step c); f) dissolving at least partially the remaining crushed trona from step d) in the second leaching tank in order to produce a second suspension; g) separating the second solid particles from the second solution to produce a production solution comprising sodium carbonate and to produce a production solid comprising the second solid particles comprising sodium bicarbonate.

公开(公告)号：US5843316A

公开(公告)日：1998-12-01

申请号：US805588

申请日：1997-02-25

申请人： Hannu Kurittu

发明人： Hannu Kurittu

IPC分类号： C01B17/34 ,  C01D1/38 ,  D21C11/00 ,  C02F1/44 ,  C01D7/32

CPC分类号： D21C11/0042 ,  C01B17/34 ,  C01D1/38 ,  D21C11/0057

摘要： The present invention relates to a method of processing white liquor obtained from the causticization stage of a pulp mill. According to the method, the white liquor, which principally contains sodium hydroxide (6) and sodium sulfide, is oxidized into polysulfide liquor (3), whereby the sodium sulfide is oxidized most advantageously with the help of a catalyst and an oxidizer such as air substantially into sodium polysulfide (7) and sodium thiosulfate. The method according to the invention is characterized in that the sodium hydroxide (6) contained in the white liquor is separated from the white liquor prior to the oxidizing step or from the polysulfide liquor (3) after the oxidizing step either entirely or partly by means of a diffusion dialysis process (4). The invention is further characterized in that the sodium hydroxide (6) separated from the white liquor is returned to the chemical circulation of the pulp mill.

摘要翻译： 本发明涉及从纸浆厂的苛化阶段得到白液的方法。 根据该方法，主要含有氢氧化钠（6）和硫化钠的白液被氧化成多硫化物液体（3），借助于催化剂和氧化剂如空气，最有利地硫化钠被氧化 基本上成为多硫化钠（7）和硫代硫酸钠。 根据本发明的方法的特征在于，白化液中所含的氢氧化钠（6）在氧化步骤之前从白液中分离出来，或者在氧化步骤之后从多硫化物液体（3）中全部或部分用装置 的扩散透析过程（4）。 本发明的特征还在于从白液中分离的氢氧化钠（6）返回纸浆厂的化学循环。

公开(公告)号：US09422166B2

公开(公告)日：2016-08-23

申请号：US12811663

申请日：2009-01-06

申请人： Jean-Paul Detournay ,  Francis M. Coustry

发明人： Jean-Paul Detournay ,  Francis M. Coustry

IPC分类号： C01D7/32 ,  C01D7/12 ,  B01D61/42 ,  C01D1/38

CPC分类号： C01D7/126 ,  B01D61/422 ,  C01D1/38 ,  C01D7/32

摘要： In a process to produce sodium carbonate, a first production solution comprising sodium carbonate is introduced into less basic compartments of an electrodialyzer comprising alternating less basic and more basic adjacent compartments separated from each other by cationic membranes, the more basic compartments being delimited by anionic faces of bipolar membranes on one side and by the cationic membranes on the other side; a second production solution comprising sodium carbonate is introduced into the more basic compartments of the electrodialyzer; a solution comprising sodium hydroxide is produced into the more basic compartments by combination of sodium ions flux sodium ions crossing the cationic membrane and hydroxyl ions flux crossing the anionic face of the bipolar membranes, and is then extracted from the electrodialyzer to be used as a reaction solution; and the reaction solution is reacted with sodium bicarbonate in order to form a produced solution comprising sodium carbonate.

摘要翻译： 在生产碳酸钠的方法中，将包含碳酸钠的第一制备溶液引入电解槽的较少碱性室中，其包含由阳离子膜彼此分离的交替的较少碱性和更碱性的相邻隔室，更基本的隔室由阴离子面 双极膜在一侧和另一侧的阳离子膜; 将包含碳酸钠的第二制备溶液引入电渗析器的更碱性的隔室中; 将包含氢氧化钠的溶液通过与阳离子膜交叉的钠离子通量钠离子与穿过双极性膜的阴离子面的羟基离子通量的组合而形成到更碱性的隔室中，然后从电渗析器中提取以用作反应 解; 并将反应溶液与碳酸氢钠反应，以形成包含碳酸钠的生产溶液。