Reactions between Hydrogen Sulfide and Sulfuric Acid:  A Novel Process for Sulfur Removal and Recovery

2000 ◽  
Vol 39 (7) ◽  
pp. 2505-2509 ◽  
Author(s):  
Qinglin Zhang ◽  
Ivo G. Dalla Lana ◽  
Karl T. Chuang ◽  
Hui Wang
Keyword(s):  
Hydrogen Sulfide ◽  
Sulfuric Acid ◽  
Sulfur Removal ◽  
Removal And Recovery

scholarly journals Removal of sulfur contaminants from biogas to enable direct catalytic methanation

2019 ◽  
Author(s):  
Christian Dannesboe ◽  
John Bøgild Hansen ◽  
Ib Johannsen
Keyword(s):  
Hydrogen Sulfide ◽  
Dimethyl Sulfide ◽  
Renewable Energy Sources ◽  
Sulfur Removal ◽  
Carbonyl Sulfide ◽  
Acidithiobacillus Thiooxidans ◽  
Carbon Utilization ◽  
Combined System ◽  
Renewable Biomass ◽  
Biogas Reactor

AbstractIn the near future, renewable energy sources will replace fossil energy. To allow full carbon utilization of renewable biomass, we have demonstrated a possible integration between a biogas reactor, an electrolysis unit, and a catalytic methanation reactor. Stringent removal of all sulfur contaminants in raw biogas is required to enable this integration. We demonstrate how existing bulk sulfur removal solutions, like a biotrickling filter loaded with Acidithiobacillus thiooxidans and impregnated activated carbon, are unable to meet this requirement. Only the main sulfur contaminant hydrogen sulfide (H2S) can effectively be removed. Contaminants carbon disulfide (CS2), dimethyl sulfide (DMS), and carbonyl sulfide (COS) will leak through the carbon filter, long before hydrogen sulfide can be detected. Utilization of surplus oxygen from the combined system is proven problem free and allows sulfur removal without introducing contaminants. Provided that a recommended sulfur guard is included, the proposed design is ready for full-scale implementation.

ChemInform Abstract: Electrocatalytic Reduction of Sulfuric Acid to Hydrogen Sulfide by a Trinuclear Niobium Cluster.

ChemInform ◽  
2010 ◽  
Vol 25 (23) ◽  
pp. no-no
Author(s):  
E. A. PAUL ◽  
T. H. BATTEN ◽  
M. A. MAY ◽  
W. R. SAYERS ◽  
P. E. SHELTON ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Sulfuric Acid ◽  
Electrocatalytic Reduction

The Determination of Free Sulfur in Soft Vulcanized Rubber by a Volumetric Method

1932 ◽  
Vol 5 (3) ◽  
pp. 360-362 ◽  
Author(s):  
W. D. Guppy
Keyword(s):  
Hydrogen Sulfide ◽  
Sulfuric Acid ◽  
Organic Compounds ◽  
Subsequent Oxidation ◽  
Vulcanized Rubber ◽  
Elementary State ◽  
Previously Treated ◽  
Mineral Sulfides ◽  
Free Sulfur

Abstract The methods so far proposed for the determination of the free sulfur in vulcanized rubber depend upon the removal of the sulfur by extraction of the rubber with hot acetone, and subsequent oxidation to sulfuric acid of the sulfur in the extract. The extract is liable however to contain, in addition to sulfur in the elementary state, organic compounds containing sulfur derived from the rubber resins, accelerator, or antioxidant. In the subsequent oxidation this sulfur will be oxidized to sulfuric acid to an extent which depends on the method of oxidation used. In the present work, a method of analysis has been developed which is more rapid than the existing methods, and in which it is considered that the determination of the sulfur present in the elementary state is less likely to be affected by organic compounds containing sulfur. It has been found that when vulcanized rubber placed in contact with a metal, such as tin or aluminum, is boiled in hydrochloric acid, hydrogen sulfide is generated by the action of the nascent hydrogen produced. This reaction occurred with rubber which had been previously treated with acid alone to decompose metallic sulfides, but no hydrogen sulfide was obtained from rubber which had been previously extracted with acetone and was free from metallic sulfides. As these results showed that the reactions were not due to the presence of mineral sulfides, or of sulfur combined with the rubber, it was concluded that the hydrogen sulfide was formed by the reduction of the free sulfur.

An ac impedance study of the anodic dissolution of iron in sulfuric acid solutions containing hydrogen sulfide

1998 ◽  
Vol 451 (1-2) ◽  
pp. 11-17 ◽  
Author(s):  
Houyi Ma ◽  
Xiaoliang Cheng ◽  
Shenhao Chen ◽  
Chao Wang ◽  
Jiping Zhang ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Sulfuric Acid ◽  
Anodic Dissolution ◽  
Ac Impedance ◽  
Acid Solutions ◽  
Impedance Study ◽  
Sulfuric Acid Solutions

scholarly journals Protection of stainless steel in sulfuric acid solution containing hydrogen sulfide by inhibitors

2016 ◽  
Vol 5 (2) ◽  
pp. 147-158 ◽  
Author(s):  
Ya.G. Avdeev ◽  
◽  
L.V. Frolova ◽  
D.S. Kuznetsov ◽  
M.V. Tyurina ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Hydrogen Sulfide ◽  
Sulfuric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution

Mathematical Simulation of Membrane-Absorption for H2S Capture from Nature Gas

2013 ◽  
Vol 302 ◽  
pp. 20-25
Author(s):  
Lu Ma ◽  
Shu Li Wang ◽  
Jian Wang ◽  
En Tian Li ◽  
Xin Cao
Keyword(s):  
Mass Transfer ◽  
Hydrogen Sulfide ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Sulfur Removal ◽  
Operating Conditions ◽  
Operating Costs ◽  
Fiber Membrane ◽  
Nature Gas ◽  
Membrane Contactors

A dynamic model of mass transfer was developed with mass transfer equation and mass transfer differential equation according to two film theory for the simultaneous transport of hydrogen sulfide through hollow fiber membrane (HFM) contactors while using N-methyldiethanolamine (MDEA) as the chemical solvent. The model results are in excellent agreement with the experimental data. The results indicate that the removal of H2S increased while increasing concentration of MDEA and gas pressure, however, the removal of H2S decreases while increasing gas velocity. The concentration of H2S increases at the same place in the lumen while increasing gas velocity. There is serious decreasing amplitude of axial concentration of H2S during the initial stage, but it slows down at half of the length and a great reduction of H2S concentration in radial direction with the increase of the length. The decreasing amplitude is dropped due to the concentration of H2S decreased in radial direction. The model can indicate H2S removal rate in given operational conditions and offer theory evidence for the design of membrane contactor. Natural gas is believed to play a vital role in the next few decades for industrial and domestic utilization. It is considered as one of the cleanest and safest of all energy sources. However, nature gas is not a pure hydrocarbon and sometimes it has some sour gases such as hydrogen sulfide which has high toxicity. Hydrogen sulfide can not only corrode equipment and transmission pipeline under aerobic and hot humid conditions but also cause catalyst poisoning, even serious threaten the safety of human. Wet desulphurization is widely used for natural gas treatment and aqueous solutions of alkanolamines are often used as absorption solvent. Among these alkanolamines, MDEA as an absorption solvent of acid gases is widely used today because it possesses the characteristics such as higher H2S selectivity, bigger absorption capacity, lower regeneration energy, smaller hot-degradation and lower circulating load. But desulphurization unit can be seriously corroded in the sulfur removal process. On the other hand, these conventional processes such as absorption towers, packed and plate columns possess many disadvantages such as flooding, foam formation, and demand high capital and operating costs. So the technology meets a certain obstacles. Recently, new processes using gas–liquid membrane contactors as gas absorption devices have been a subject of great interest. Among the diversity of membrane geometries available for membrane contactors, hollow-fiber membrane contactors are favored due to their high surface/volume ratio for separation which is 30-50 times compared with traditional absorbers. This type of process offers several practical advantages including low energy and operating costs, simplicity and occupying small area. In addition, membrane contactors as unit equipment can be combined according to actual need. [4~5] used polypropylene hollow fiber membrane as the absorber and MDEA as the chemical solvent for the absorption of H2S via changing operating conditions (e.g. temperature, pressure, the concentration of the solvent, flux of gas-liquid phase) and studied the influence of the changes to mass transfer coefficient and sulfur removal efficiency. The results indicate that the sulfur removal efficiency can be 95% above by optimizing the operating conditions. At home and abroad, comprehensive two-dimensional mathematical models were developed based on differential equation. Wang [6] simulated the absorption of CO2 using different absorption medium in hollow fiber membrane contactors. But they did not consider the effect of mixed gas. Chen [7] modeled the distribution of reactants and products concentration in the shell side in different typ es of reaction. However, the model can not obtain the concentration of H2S in the lumen. Rami Faiz [8] modeled the distribution of acid gas, but the mathematical model was not validated by the experimental work.

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