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1.发明公开
公开(公告)号：EP1565402A1
公开(公告)日：2005-08-24
申请号：EP03758033.9
申请日：2003-10-21
申请人： Outokumpu Oyj
IPC分类号： C01B17/765
CPC分类号： C01B17/7655
摘要： The present invention is concerned with a process and a plant for the production of sulphuric acid wherein a sulphur dioxide-containing feed gas is converted, at least in part, with oxygen in at least two contact stages of main contacts arranged in series, to generate sulphur trioxide, and wherein generated sulphur trioxide-containing gas is conducted to an absorber and converted therein to sulphuric acid. In order to be able to economically process feed gases of a sulphur dioxide content of between 13 and 66 % by volume to sulphuric acid, using conventional catalysts, it is suggested to withdraw from a contact stage connected upstream of the last main contact stage, a partial stream of the sulphur dioxide- and sulphur trioxide-containing gas, to mix the said partial stream with the feed gas to generate a contact gas of a sulphur dioxide content of more than 13 % by volume, and to return the same to the first contact stage.
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2.发明公开
公开(公告)号：EP1409756A1
公开(公告)日：2004-04-21
申请号：EP02743117.0
申请日：2002-05-28
申请人： Outokumpu Oyj
发明人： DAUM, Karl-Heinz , RAUSER, Wolf-Christoph , ANASTASIJEVIC, Nikola , SCHALK, Wolfram , LAIBACH, Stefan , SCHNAUBELT, Herbert
CPC分类号： F28F21/082 , C22C38/44 , C23F13/005 , F28F19/004
摘要： This invention relates to a method for the protection against corrosion of steel parts made of austenitic or semi-austenitic steel during the production of sulfuric acid. To improve the corrosion resistance of the steel parts which are in contact with the sulfuric acid, it is proposed to use austenitic or semi-austenitic steel which has a Cr content of 15 wt-% to 36 wt-% and an Ni content of 9 wt-% to 60 wt-% and in which the ratio of the chemical elements (Cr + Si)/(Ni + Mo) lies in the range from 0.9 to 1.9 or in which the ratio of the chemical elements Cr/(Ni + Mo) lies in the range from 0.8 to 1.5, and to additionally provide this steel part with an anodic corrosion protection.
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公开(公告)号：EP1395788A1
公开(公告)日：2004-03-10
申请号：EP02743118.8
申请日：2002-05-28
申请人： Outokumpu Oyj
CPC分类号： F28F19/004 , C23F13/005
摘要： To protect a plate-type heat exchanger (1) against corrosion due to the attack of sulfuric acid, it is proposed in accordance with the invention that the region through which flows sulfuric acid has at least one metal cathode (16, 17) and one reference electrode (27), that at least half the metal plates (7) have an electric contact (23) which is connected with the anode (21) of an electric d.c. voltage source of variable electric voltage, that the metal cathode (16, 17) likewise is electrically connected with the d.c. voltage source, and that the d.c. voltage source belongs to a potentiostat (20) which is electrically connected with the reference electrode (27).
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公开(公告)号：EP1395788B1
公开(公告)日：2005-12-14
申请号：EP02743118.8
申请日：2002-05-28
申请人： Outokumpu Oyj
CPC分类号： F28F19/004 , C23F13/005
摘要： To protect a plate-type heat exchanger (1) against corrosion due to the attack of sulfuric acid, it is proposed in accordance with the invention that the region through which flows sulfuric acid has at least one metal cathode (16, 17) and one reference electrode (27), that at least half the metal plates (7) have an electric contact (23) which is connected with the anode (21) of an electric d.c. voltage source of variable electric voltage, that the metal cathode (16, 17) likewise is electrically connected with the d.c. voltage source, and that the d.c. voltage source belongs to a potentiostat (20) which is electrically connected with the reference electrode (27).
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