EP 0000515 B1 19811202 - PROCESS FOR THE SEPARATION OF SULPHUR DIOXIDE FROM A GAS STREAM AND INSTALLATION FOR CARRYING OUT THE PROCESS
Title (en)
PROCESS FOR THE SEPARATION OF SULPHUR DIOXIDE FROM A GAS STREAM AND INSTALLATION FOR CARRYING OUT THE PROCESS
Publication
Application
Priority
CH 906377 A 19770721
Abstract (en)
[origin: ES471907A1] A process is described for separating SO2 from a current of gas containing the same, at least intermittently, in a concentration which is impermissibly high for discharge into the ambient atmosphere, with attendant production of sulfuric acid by the nitrogen oxide process, in which latter process the SO2-containing gas initially flows through a dentriation zone, or first through a pretreatment zone forming a first sector of an SO2-processinbg zone and then through the denitration zone, thereafter through the main sector of the SO2-processing zone, and subsequently through a nitrogen oxide absorption zone, in the course of which flow it is brought into contact in at least one of the two sectors of the SO2-processing zone with dilute acid having a H2SO4-concentration of less than 70% by weight (55 DEG Be) which acid is circulated through the sector concerned of this latter zone, while in the absorption zone the nitrogen oxides released in the denitration zone are absorbed by sulfuric acid, and nitrose-containing acid having a H2SO4-concentration of 70 to 80% by weight (55 DEG to 63.5 DEG Be) is drawn off from the absorption zone and fed into the denitration zone, which process further comprises (a) measuring the content of NO in the current of gas at a point in the absorption zone or downstream of the absorption zone or simultaneously at points both in the absorption zone and downstream thereof, and (b) introducing a nitrogen-oxygen compound, or a substance which contains such a compound, into the dilute acid cycle of at least one of the two sectors of the SO2-processing zone when a specific limit value of the NO-content or of the steepness of an increase per unit of time of the NO content in the current of gas at the NO-control point or points is exceeded. A plant for carrying out this process in practice is also described.
IPC 1-7
IPC 8 full level
B01D 53/50 (2006.01); B01D 53/60 (2006.01); B01D 53/56 (2006.01); B01D 53/74 (2006.01); C01B 17/82 (2006.01); C01B 17/86 (2006.01); G05D 27/00 (2006.01)
CPC (source: EP US)
B01D 53/50 (2013.01 - EP US)
Designated contracting state (EPC)
BE CH FR GB LU NL SE
DOCDB simple family (publication)
EP 0000515 A1 19790207; EP 0000515 B1 19811202; AT 372619 B 19831025; AT A526178 A 19830315; AU 3820078 A 19800124; AU 528394 B2 19830428; BR 7804687 A 19790417; CA 1103899 A 19810630; DD 137916 A5 19791003; DE 2830214 A1 19790208; DE 2830214 C2 19890316; ES 471907 A1 19790201; FI 65978 B 19840430; FI 65978 C 19840810; FI 782255 A 19790122; IN 149347 B 19811031; IT 7850388 A0 19780720; JP S5452672 A 19790425; JP S6332723 B2 19880701; PL 111169 B2 19800830; PL 208579 A1 19790423; SU 980611 A3 19821207; US 4242321 A 19801230; ZA 784133 B 19790725
DOCDB simple family (application)
EP 78100389 A 19780713; AT 526178 A 19780720; AU 3820078 A 19780720; BR 7804687 A 19780720; CA 307714 A 19780719; DD 20685578 A 19780721; DE 2830214 A 19780710; ES 471907 A 19780720; FI 782255 A 19780717; IN 801CA1978 A 19780720; IT 5038878 A 19780720; JP 8853078 A 19780721; PL 20857978 A 19780721; SU 2640503 A 19780720; US 1226279 A 19790215; ZA 784133 A 19780720