公开(公告)号：US4091074A

公开(公告)日：1978-05-23

申请号：US701714

申请日：1976-07-01

申请人： Tokio Gorai ,  Kunio Akiba

发明人： Tokio Gorai ,  Kunio Akiba

IPC分类号： B01D53/60 ,  B01D53/77 ,  C01C1/24 ,  C01B21/00

CPC分类号： B01D53/60

摘要： A method for purifying industrial exhaust gases containing nitrogen oxides and sulfur oxides, by treating the gases with a circulating absorbing solution containing Fe-EDTA complex salt and ammonium sulfite is provided.The treatment comprises a combination of the main absorbing step with the following steps:(a) a circulation step of the absorbing solution in part or total, (b) an oxidation step of sulfite, (c) a separation step of EDTA, (d) a decomposition step of dithionate, etc., (e) a separation step of iron compound, and (f) a separation step of ammonium sulfate.According to this invention, a long time continuous operation for said purification is possible.

摘要翻译： 提供了一种通过用含有Fe-EDTA络合盐和亚硫酸铵的循环吸收溶液处理气体来净化含有氮氧化物和硫氧化物的工业废气的方法。

公开(公告)号：US4079118A

公开(公告)日：1978-03-14

申请号：US537022

申请日：1974-12-27

申请人： Tokio Gorai

发明人： Tokio Gorai

IPC分类号： B01D53/56 ,  B01D53/60 ,  B01D53/77 ,  C01B21/00

CPC分类号： B01D53/56

摘要： Industrial exhaust gas containing nitrogen oxides is treated with an aqueous solution of an iron chelate complex salt which contains essentially a sulfite salt at the time of treatment whereby nitrogen oxides which have been difficult to catch can be absorbed with a high absorbing rate even when the concentration of nitrogen oxides is low in the exhaust gas or sulfur dioxide is included in the gas, and simultaneous desulfurizing can be attained in this case. Said aqueous solution has a large absorbing capacity and may contain an ion or ions of alkali metal, alkali earth metal or ammonium.

摘要翻译： 含有氮氧化物的工业废气用处理时基本上含有亚硫酸盐的铁螯合络合盐的水溶液处理，其中难以捕获的氮氧化物可以以高吸收速率被吸收，即使当浓度 的氮氧化物在排气中低，二氧化硫被包含在气体中，并且在这种情况下可以实现同时脱硫。 所述水溶液具有大的吸收能力并且可以含有碱金属，碱土金属或铵的离子或离子。

公开(公告)号：US4013430A

公开(公告)日：1977-03-22

申请号：US645174

申请日：1975-12-29

申请人： Keiji Adachi ,  Tokio Gorai ,  Kazuaki Ohami ,  Takehiko Takahashi ,  Takayoshi Mizukami

发明人： Keiji Adachi ,  Tokio Gorai ,  Kazuaki Ohami ,  Takehiko Takahashi ,  Takayoshi Mizukami

IPC分类号： B01D53/60 ,  B01D53/14

CPC分类号： B01D53/60

摘要： In the process wherein industrial exhaust gases containing nitrogen oxides and SO.sub.2 are treated with an absorbing solution containing an iron chelate complex and a sulfite to remove nitrogen oxides and SO.sub.2, the absorptivity of the solution is reduced sometimes on account of dithionate formed during the treatment. The absorptivity-reduced absorbing solution is regenerated by heat-treating the solution at a pH of 3.0 or lower and a temperature of 80.degree. C or higher whereby the dithionate is decomposed.

摘要翻译： 在包含氮氧化物和SO 2的工业废气用含铁螯合络合物和亚硫酸盐的吸收溶液处理以除去氮氧化物和SO 2的过程中，由于处理期间形成的连二硫酸盐，有时会降低溶液的吸收性。 吸收性降低的吸收溶液通过在pH3.0以下和80℃以上的温度下热处理而再生，由此使连二磺酸盐分解。