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    • 7. 发明授权
    • Process for the dearsenification of polyphosphoric acid
    • 多磷酸脱砷方法
    • US4399114A
    • 1983-08-16
    • US402941
    • 1982-07-29
    • Alexander MaurerGero HeymerMarkus Erpenbach
    • Alexander MaurerGero HeymerMarkus Erpenbach
    • C01B25/24C01B25/16
    • C01B25/24
    • The disclosure relates to a process for the continuous dearsenification of polyphosphoric acid with the aid of hydrogen sulfide in a gas admission zone. To this end, the disclosure provides for the acid to be dearsenified in a gas admission zone subdivided so as to comprise at least two separate liquid matter-receiving zones, each zone being separated from the other by means of a separate gas zone; for the liquid in each of the liquid matter-receiving zones to be maintained at a level 0.1 up to 10 cm high, without admission of gas; for hydrogen sulfide which remained unreacted in the individual liquid matter-receiving zones to be collected in the respective gas zone and for it to be finely redispersed in the liquid matter-receiving zone directly upstream of the respective gas zone by allowing the hydrogen sulfide to flow through a plurality of openings into the acid, the latter being delivered from the respective liquid-matter-receiving zone into the next downstream liquid-matter-receiving zone, and introduced thereinto directly below the liquid matter level therein; for precipitated arsenic sulfide to be separated from the acid coming from the lower end of the gas admission zone, and for the filtrate obtained to be freed from gaseous hydrogen sulfide in excess.
    • 本公开涉及在气体入口区借助硫化氢连续脱砷多磷酸的方法。 为此,本公开内容提供了在气体进入区域中进行脱砷的酸,其被细分为包括至少两个分离的液体物质接收区域,每个区域通过单独的气体区域与另一个区域分离; 使每个液体物质接收区域中的液体保持在0.1至10厘米高的水平,而不允许气体; 对于在各个液体物质接收区中保持未反应的硫化氢,其被收集在各个气体区中,并且通过允许硫化氢流动直接在各个气体区的上游被精细地再分散在液体物质接收区中 通过多个开口进入酸,后者从相应的液体接收区输送到下一个下游液体接收区,并直接在其中引入液体物质的下方; 使沉淀的硫化砷与气体入口区的下端的酸分离,得到的过滤得到的无水硫化氢的滤液。