FUNDAMENTAL INVESTIGATIONS OF SULPHURIC ACID DECOMPOSITION IN VOLUMETRIC RECEIVERS

1998 ◽  
Author(s):  
R. Nowak ◽  
O. Unruh ◽  
P. Roosen
Keyword(s):  
Sulphuric Acid ◽  
Acid Decomposition

Proposed Concept Design for the High Temperature Sulphuric Acid Decomposition Reactor Applicable to the Hybrid Sulphur (HyS) Process

2008 ◽  
Author(s):  
M. D. Coetzee ◽  
P. W. E. Blom
Keyword(s):  
Sulphuric Acid ◽  
Packed Bed ◽  
Reactor System ◽  
Operating Pressure ◽  
Concept Design ◽  
Acid Decomposition ◽  
Multi Stage ◽  
Production Of Hydrogen ◽  
Maximum Conversion ◽  
Reactor Operating

The utilization of alternate sources of energy is becoming more important due to the constantly growing world-wide demand for energy. The production of hydrogen via the Hybrid Sulphur process is a possible alternative that may contribute to alleviating the pressure on energy resources. The current field of interest is to investigate the operation of the sulphuric acid decomposition reactor operating at pressure ranges between 8 and 9 MPa. The reduction of SO3 to SO2 is, however, favoured at low pressures while maintaining high operating temperatures. Considering this, the need to investigate the possibility of operating at lower operating pressures is important in striving for higher process efficiencies. The proposed decomposition reactor is a multi-stage reactor system operated adiabatically with inter-stage heating in order to simplify the reactor design and improve the over-all conversion and efficiency of the process. At a pressure of 8–9 MPa and temperature of 900°C, the maximum conversion of SO3 to SO2 that can be achieved is between 48% and 54%. The proposed multi-stage reactor system has 5 packed bed (catalyst) reactor stages with 4 intermediate heat exchangers, and by lowering the operating pressure to 3 kPa, a maximum conversion of 72% could be achieved. The viability of the HyS process mainly depends on the performance of the SO3 decomposition reactor.

A non-cyanide method of electropolishing silver

1978 ◽  
Vol 36 (1) ◽  
pp. 146-147
Author(s):  
R. L. Lyles ◽  
S. J. Rothman ◽  
W. Jäger
Keyword(s):  
Electron Microscopy ◽  
Sulphuric Acid ◽  
Methyl Alcohol ◽  
Health Hazards ◽  
Silver Alloy ◽  
High Quality ◽  
Silver Alloys ◽  
Free Sample ◽  
Specimen Quality ◽  
Standard Techniques

Standard techniques of electropolishing silver and silver alloys for electron microscopy in most instances have relied on various CN recipes. These methods have been characteristically unsatisfactory due to difficulties in obtaining large electron transparent areas, reproducible results, adequate solution lifetimes, and contamination free sample surfaces. In addition, there are the inherent health hazards associated with the use of CN solutions. Various attempts to develop noncyanic methods of electropolishing specimens for electron microscopy have not been successful in that the specimen quality problems encountered with the CN solutions have also existed in the previously proposed non-cyanic methods.The technique we describe allows us to jet polish high quality silver and silver alloy microscope specimens with consistant reproducibility and without the use of CN salts.The solution is similar to that suggested by Myschoyaev et al. It consists, in order of mixing, 115ml glacial actic acid (CH3CO2H, specific wt 1.04 g/ml), 43ml sulphuric acid (H2SO4, specific wt. g/ml), 350 ml anhydrous methyl alcohol, and 77 g thiourea (NH2CSNH2).

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