公开(公告)号：EP1230439A1

公开(公告)日：2002-08-14

申请号：EP00941961.5

申请日：2000-05-19

申请人： Outokumpu Oyj

发明人： ANASTASIJEVIC, Nikola ,  LAIBACH, Stefan ,  MÜNKER, Friedhelm ,  SCHWEITZER, Markus ,  KÜHN, Walter

IPC分类号： C25C7/06

CPC分类号： C25C7/00 ,  C25C1/00

摘要： The electrolyte is guided from a reservoir (6) to an electrolysis area through at least one supply line (4). Said electrolysis area is provided with anodes and cathodes and at least one electrical direct voltage source. Used electrolyte is at least partially guided back from the electrolysis area to the reservoir through at least one discharge line (9). A bridge section of line (12) containing electrolyte exists between a first contact point (A) in the supply line electrolyte and a second contact point (B) in the discharge line electrolyte. The ohmic resistance (R1) of the electrolyte in the bridge section of line (12) between the first and second contact point is at most 10 % of the ohmic resistance (R2) that is present between the first and second contact points in the electrolyte flowing through the reservoir. The quantity of electrolyte that flows through the bridge section of line per unit of time is at most 5 % of the quantity of electrolyte flowing in the supply line in the area of the first contact point.

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

IPC分类号： C22C19/05 ,  C22C38/44 ,  C23F13/00

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.

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

发明人： ANASTASIJEVIC, Nikola ,  DAUM, Karl-Heinz ,  SCHALK, Wolfram ,  LAIBACH, Stefan

IPC分类号： F28F19/00 ,  C23F13/00

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).

公开(公告)号：EP1284926B1

公开(公告)日：2012-07-18

申请号：EP01929589.8

申请日：2001-04-20

申请人： Outokumpu Oyj

发明人： ANASTASIJEVIC, Nikola ,  WERNER, Dietrich ,  RUNKEL, Marcus ,  LAIBACH, Stefan ,  WINKLER, Egon ,  HOLLNAGEL, Achim

IPC分类号： C01B17/79 ,  B01J23/847 ,  B01J23/843 ,  B01J35/00

CPC分类号： B01J23/8432 ,  B01J21/08 ,  B01J23/22 ,  B01J35/0006 ,  C01B17/79

摘要： A gas mixture containing molecular oxygen and 15 to 60 vol. % SO2 flows through a first catalyst layer containing a catalyst containing vanadium pentoxide and immediately afterwards, through a second catalyst layer containing a catalyst containing iron. Said gas mixture is guided into the first catalyst layer at an entry temperature of 350 to 600 °C, said first catalyst layer containing a granular V205 catalyst and 20 to 80 wt. % catalytically inactive inert material. Immediately afterwards, the gas mixture is guided into the second catalyst layer at a temperature of 500 to 750 °C. The catalyst in the second catalyst layer preferably contains 3 to 30 wt. % arsenic oxide. The result is preferably a product gas containing SO3 with a SO2:SO3 volume ratio of at most 0.1.

公开(公告)号：EP1284926A1

公开(公告)日：2003-02-26

申请号：EP01929589.8

申请日：2001-04-20

申请人： Outokumpu Oyj

发明人： ANASTASIJEVIC, Nikola ,  WERNER, Dietrich ,  RUNKEL, Marcus ,  LAIBACH, Stefan ,  WINKLER, Egon ,  HOLLNAGEL, Achim

IPC分类号： C01B17/79 ,  B01J23/847 ,  B01J23/843

CPC分类号： B01J23/8432 ,  B01J21/08 ,  B01J23/22 ,  B01J35/0006 ,  C01B17/79

摘要： A gas mixture containing molecular oxygen and 15 to 60 vol. % SO2 flows through a first catalyst layer containing a catalyst containing vanadium pentoxide and immediately afterwards, through a second catalyst layer containing a catalyst containing iron. Said gas mixture is guided into the first catalyst layer at an entry temperature of 350 to 600 °C, said first catalyst layer containing a granular V205 catalyst and 20 to 80 wt. % catalytically inactive inert material. Immediately afterwards, the gas mixture is guided into the second catalyst layer at a temperature of 500 to 750 °C. The catalyst in the second catalyst layer preferably contains 3 to 30 wt. % arsenic oxide. The result is preferably a product gas containing SO3 with a SO2:SO3 volume ratio of at most 0.1.

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

发明人： ANASTASIJEVIC, Nikola ,  DAUM, Karl-Heinz ,  SCHALK, Wolfram ,  LAIBACH, Stefan

IPC分类号： F28F19/00 ,  C23F13/00

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).

公开(公告)号：EP1230439B1

公开(公告)日：2003-07-16

申请号：EP00941961.5

申请日：2000-05-19

申请人： Outokumpu Oyj

发明人： ANASTASIJEVIC, Nikola ,  LAIBACH, Stefan ,  MÜNKER, Friedhelm ,  SCHWEITZER, Markus ,  KÜHN, Walter

IPC分类号： C25C7/06

CPC分类号： C25C7/00 ,  C25C1/00

摘要： The electrolyte is guided from a reservoir (6) to an electrolysis area through at least one supply line (4). Said electrolysis area is provided with anodes and cathodes and at least one electrical direct voltage source. Used electrolyte is at least partially guided back from the electrolysis area to the reservoir through at least one discharge line (9). A bridge section of line (12) containing electrolyte exists between a first contact point (A) in the supply line electrolyte and a second contact point (B) in the discharge line electrolyte. The ohmic resistance (R1) of the electrolyte in the bridge section of line (12) between the first and second contact point is at most 10 % of the ohmic resistance (R2) that is present between the first and second contact points in the electrolyte flowing through the reservoir. The quantity of electrolyte that flows through the bridge section of line per unit of time is at most 5 % of the quantity of electrolyte flowing in the supply line in the area of the first contact point.