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    • 3. 发明申请
    • Process For Producing Silica and Sodium Sulfite With Sodium Sulfate
    • 用硫酸钠生产二氧化硅和亚硫酸钠的方法
    • US20080202387A1
    • 2008-08-28
    • US11916863
    • 2005-06-06
    • Yuanjian Lu
    • Yuanjian Lu
    • C04B14/04
    • C01B33/193C01B33/32C01D5/14
    • A method is provided to produce silica and sodium sulfite with sodium sulfate, wherein a mixture of quartz sand, sodium sulfate and carbon is reacted to produce solid sodium silicate and sulfur dioxide; said solid sodium silicate is dissolved in water and then filtered to obtain a sodium silicate solution; said sodium silicate solution is brought into contact with the sulfur dioxide to produce precipitated silica and sodium sulfite solution; the resultant mixture is filtered; the filter cake is acidified and then goes through filtration, washing and drying to obtain silica; and the filtrate is concentrated and dried to get sodium sulfite. The process of the present invention has great value due to its simple steps, low production cost and reduction of environmental problems.
    • 提供了一种用硫酸钠生产二氧化硅和亚硫酸钠的方法,其中将石英砂,硫酸钠和碳的混合物反应以产生固体硅酸钠和二氧化硫; 将所述固体硅酸钠溶解在水中,然后过滤得到硅酸钠溶液; 所述硅酸钠溶液与二氧化硫接触以产生沉淀二氧化硅和亚硫酸钠溶液; 将所得混合物过滤; 将滤饼酸化,然后通过过滤,洗涤和干燥得到二氧化硅; 将滤液浓缩并干燥,得到亚硫酸钠。 本发明的工艺步骤简单,生产成本低,环保问题减少。
    • 6. 发明授权
    • Method for preparing compositions which can be used in the production of
sodium dithionite; and the use of such compositions
    • 可用于生产连二亚硫酸钠的组合物的制备方法; 和使用这种组合物
    • US4680136A
    • 1987-07-14
    • US731296
    • 1985-05-07
    • Ragnar Bernhard
    • Ragnar Bernhard
    • C01B17/66C01D5/14C09K3/00
    • C01B17/66C01D5/14
    • There is provided a method for producing compositions which can be used for preparing sodium dithionite, in which sulphur dioxide is brought into contact with a recirculating aqueous solution of sodium hydroxide and previously absorbed sulphur dioxide to a ratio of sulphur dioxide and the sum of sulphur dioxide and sodium oxide of 0.61-0.66, whereafter the resultant mixture is pressurized and liquid sulphur dioxide introduced therein to a ratio between sulphur dioxide and the sum of sulphur dioxide and sodium oxide of 0.75-0.81, and the water content is adjusted to a concentration of sulphur dioxide+sodium oxide of 10-13 percent by weight. The invention also relates to the use of the prepared composition for the manufacture of dithionite.
    • 提供了一种制备可用于制备连二亚硫酸钠的组合物的方法,其中二氧化硫与氢氧化钠的再循环水溶液和预先吸收的二氧化硫接触至二氧化硫的比例和二氧化硫的总和 和氧化钠0.61-0.66,之后将所得混合物加压,并将二氧化硫与二氧化硫和二氧化硫和氧化钠之和的比例引入其中,其中二氧化硫与硫化钠的总量之比为0.75-0.81,并将水含量调节至 二氧化硫+氧化钠为10-13重量%。 本发明还涉及制备的连二亚硫酸盐制备的组合物的用途。
    • 7. 发明授权
    • Recovery of concentrated H.sub.2 S from SO.sub.2 contained in flue gas
    • 从烟气中所含的SO2回收浓缩的H2S
    • US4588567A
    • 1986-05-13
    • US695634
    • 1985-01-28
    • Ralph Miller
    • Ralph Miller
    • B01D53/50C01B17/16C01D5/14C01B17/00C01B17/60C01B31/20
    • B01D53/501C01B17/164C01D5/14
    • This invention is a regenerable process for producing gaseous hydrogen sulfide in concentrated form from sulfur dioxide obtained from a dilute gas source by (1) reacting the SO.sub.2 with a concentrated solution of Na.sub.2 SO.sub.3 to form Na.sub.2 S.sub.2 O.sub.5 in solution and then either: (2) reacting the Na.sub.2 S.sub.2 O.sub.5 with Na.sub.2 CO.sub.3 to form solid Na.sub.2 SO.sub.3, a concentrated solution of Na.sub.2 SO.sub.3 which is recycled to the SO.sub.2 reaction and concentrated gaseous CO.sub.3 which is used in a subsequent step, (3) reducing the Na.sub.2 SO.sub.3 to Na.sub.2 S, (4) reacting the Na.sub.2 S with solid NaHCO.sub.3 to form gaseous H.sub.2 S and Na.sub.2 CO.sub.3, (5) recycling part of the Na.sub.2 CO.sub.3 to (2) above and reacting the remainder with concentrated CO.sub.2 from (2) above to form solid NaHCO.sub.3 and recycling the solid NaHCO.sub.3 to (4) above, or; (2) reacting the Na.sub.2 S.sub.2 O.sub.5 with NaHCO.sub.3 to form solid Na.sub.2 SO.sub.3, a concentrated solution of Na.sub.2 SO.sub.3 which is recycled to the SO.sub.2 reaction, and concentrated, gaseous CO.sub.2 which is used in a subsequent step, (3A) reducing the Na.sub.2 SO.sub.3 to Na.sub.2 S, (4A) reacting the Na.sub.2 S in solution with water and gaseous CO.sub.2 from (2A) above to form gaseous H.sub.2 S and solid NaHCO.sub.3 and (5A) recycling the solid NaHCO.sub.3 to (2A) above.
    • 本发明是通过(1)使SO 2与Na 2 SO 3的浓缩溶液反应以在溶液中形成Na 2 S 2 O 5,然后或者:(2)使所述SO 2与Na 2 SO 3的浓度溶液反应,从而从稀释气体源获得的二氧化硫产生浓缩形式的气态硫化氢 Na 2 SO 4与Na 2 CO 3反应形成固体Na 2 SO 3,Na 2 SO 3的浓缩溶液再循环至SO 2反应,浓缩的气态CO 3用于随后的步骤,(3)将Na 2 SO 3还原为Na 2 S,(4)使Na 2 S与固体NaHCO 3 以形成气态H 2 S和Na 2 CO 3,(5)将部分Na 2 CO 3再循环到上述(2),并将其余部分与上述(2)中的浓缩CO 2反应以形成固体NaHCO 3并将固体NaHCO 3再循环至上述(4) (2)使Na 2 S 2 O 5与NaHCO 3反应以形成固体Na 2 SO 3,再循环至SO 2反应的Na 2 SO 3浓缩溶液和用于随后步骤的浓缩气态CO 2,(3A)将Na 2 SO 3还原为Na 2 S(4A )使溶液中的Na 2 S与上述(2A)中的水和气态CO 2反应以形成气态H 2 S和固体NaHCO 3和(5A)将固体NaHCO 3再循环至上述(2A)。