Process for producing high-purity sulfuric acid
    51.
    发明授权
    Process for producing high-purity sulfuric acid 失效
    生产高纯度硫酸的方法

    公开(公告)号:US5711928A

    公开(公告)日:1998-01-27

    申请号:US776914

    申请日:1997-02-13

    申请人: Akira Morisaki

    发明人: Akira Morisaki

    IPC分类号: C01B17/74 C01B17/90

    CPC分类号: C01B17/901 C01B17/74

    摘要: A process for producing high-purity sulfuric acid, comprising: an absorption step of causing water to contact sulfuric acid anhydride in a gaseous state which may possibly contain sulfurous acid gas as an impurity, so as to cause the sulfuric acid anhydride to be absorbed into the water, thereby to provide sulfuric acid; a stripping step of subjecting the sulfuric acid to stripping by use of air, thereby to separate and remove the sulfurous acid gas in the sulfuric acid; and a transport step of subjecting at least a portion of the sulfuric acid to liquid transportation by means of a circulating pump; wherein the temperature of the liquid at the inlet port of the circulating pump is 0.degree.-30.degree. C. When the above process is used, it is possible to produce high-purity sulfuric acid from which metal constituents and sulfurous acid gas as impurities have highly been removed.

    摘要翻译: PCT No.PCT / JP96 / 01649 Sec。 371日期1997年2月13日 102(e)1997年2月13日PCT PCT 1996年6月17日PCT公布。 出版物WO97 / 00228 PCT 日本1997年1月3日制造高纯度硫酸的方法,其特征在于,包括:使水以可能含有亚硫酸气作为杂质的气态接触硫酸酐的吸收步骤,使硫酸 酸酐被吸收到水中,从而提供硫酸; 利用空气对硫酸进行汽提的汽提工序,分离除去硫酸中的亚硫酸气体; 以及通过循环泵使至少一部分硫酸进行液体输送的输送步骤; 其中循环泵的入口处的液体的温度为0℃-30℃。当使用上述方法时,可以生产高纯度硫酸,其中作为杂质的金属成分和亚硫酸气体具有 高度被删除。

    Distillation method and apparatus for reprocessing sulfuric acid
    52.
    发明授权
    Distillation method and apparatus for reprocessing sulfuric acid 失效
    用于硫酸再加工的蒸馏方法和装置

    公开(公告)号:US4980032A

    公开(公告)日:1990-12-25

    申请号:US231849

    申请日:1988-08-12

    摘要: An apparatus and method for reprocessing waste piranha containing contaminated H.sub.2 SO.sub.4 from, for example, a semiconductor processing operation is described. The apparatus and method include a first distillation flask which are maintained under a substantial vacuum. The first distillation flask includes a first column with a column packing means and a reflux means to retard loss of H.sub.2 SO.sub.4 in the first distillation. The second distillation flask boils off substantially pure H.sub.2 SO.sub.4 through a column which is coupled to a condenser which condenses substantially pure H.sub.2 SO.sub.4.

    摘要翻译: 描述了一种用于从例如半导体处理操作中再处理含有污染的H 2 SO 4的废弃食人鱼的设备和方法。 该装置和方法包括保持在基本真空下的第一蒸馏瓶。 第一蒸馏瓶包括具有柱填充装置的第一塔和用于在第一蒸馏中延迟H 2 SO 4的损失的回流装置。 第二蒸馏瓶通过与冷凝器相连的柱子将基本上纯的H 2 SO 4烧掉,冷凝器冷凝基本上纯的H 2 SO 4。