scholarly journals CHEMICAL DESULPHURISATION OF SUB-BITUMINOUS HIGH SULPHUR INDONESIAN COAL VIA PEROXYACETIC ACID TREATMENT

2017 ◽  
Vol 20 (1) ◽  
pp. 27-36 ◽  
Author(s):  
M.A.M. Ishak ◽  
K. Ismail ◽  
M.A.M. Nawi ◽  
A.F. Ismail
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Temperature ◽  
Volume Ratio ◽  
Sulphur Content ◽  
Peroxyacetic Acid ◽  
X Ray ◽  
Total Sulphur ◽  
Total Sulphur Content ◽  
Organic Sulphur ◽  
Indonesian Coal

The chemical desulphurisation from an Indonesian high sulphur sub-bituminous Banjarmasin Haji Ali-Aliansar coal was investigated using the peroxyacetic acid (PAA), a mild oxidising agent. A mixture of hydrogen peroxide:acetic acid (i.e. 30:70 by volume ratio with 6% of hydrogen peroxide concentration) at 50°C of reaction temperature is capable of reducing the total sulphur content in the coal from 3.46% to 1.29% by weight, corresponding to the removal of up to ca. 72% of the total sulphur; both the inorganic (mainly pyrite) and organic sulphur forms, and approximately 10 to 44% of ashes in the coal. The simultaneous removal of both inorganic and organic sulphur forms was measured with respect to reagent volume mixed ratio, reaction temperature and hydrogen peroxide concentrations. The success of desulphurisation was measured by the reduction of the total sulphur content of the desulphurised product, its S/ C atomic ratios and ash yields of the treated coal. In general, all inorganic and some of the organic sulphur could be removed from the coal using mild conditions without severely affecting the coal microstructure as observed via the Scanning Electron Microscope with Energy Dispersive X-ray (SEM-EDX)  which supplied the coal sample.

scholarly journals Modification of Pyrolytic Oil from Waste Tyres as a Promising Method for Light Fuel Production

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 880 ◽  
Author(s):  
Cezary Dębek
Keyword(s):  
Specific Weight ◽  
Flash Point ◽  
Sulphur Content ◽  
Fuel Production ◽  
Total Sulphur ◽  
Total Sulphur Content ◽  
Heating Fuel ◽  
Waste Tyres ◽  
Heating Oil ◽  
Pyrolytic Oil

Due to its high total sulphur content and other unfavourable properties, pyrolytic oil obtained as a result of tyres pyrolysis is not suitable for use as motor or heating fuel. Therefore, pyrolytic oil was hydrorefined. Hydrorefined oil was used as a component of light heating oil. A composition was prepared from 30 wt % hydrorefinate with 70 wt % Ekoterm Plus (a commercial oil). Unfortunately, the flash point temperature of the hydrorefinate was too low, and did not allow fuel compliant with the Polish standard PN-C-96024:2011 for L1 light heating oil to be obtained. Therefore, the fraction with boiling point below 180 °C was removed from the hydrorefinate. The residue, with a flash point of 74 °C and a sulphur content of 0.143 wt %, was mixed with Ekoterm Plus and fuels with a hydrorefinate fraction content of 30 and 50 wt % were prepared. The composition containing 30 wt % met the requirements for L1 oil in the whole range of tested parameters. Total sulphur content was 0.092 wt %, specific weight was 856 kg/m3 and closed cup flash point was 64 °C. However, the composition containing 50 wt % hydrorefinate did not meet the requirements regarding sulphur content and specific weight. Sulphur content, specific gravity, and flash point are the parameters limiting the possibility of using hydrorefined pyrolytic oil for composing light heating oils compliant with the mentioned standard.

scholarly journals Evolution of the Total Sulphur Content in Full-Scale Wastewater Sludge Treatment

2009 ◽  
Vol 26 (4) ◽  
pp. 867-872 ◽  
Author(s):  
Raf Dewil ◽  
Jan Baeyens ◽  
Joris Roels ◽  
Boudewijn Van De Steene
Keyword(s):  
Full Scale ◽  
Wastewater Sludge ◽  
Sulphur Content ◽  
Sludge Treatment ◽  
Total Sulphur ◽  
Total Sulphur Content

scholarly journals Depth-wise fractionation of sulphur in cultivated soils of low and mid hills of Himachal Pradesh

2021 ◽  
Vol 22 (1&2) ◽  
pp. 167-171
Author(s):  
Deepika Suri ◽  
V. K. Sharma ◽  
R. G. Upadhyay ◽  
Anjali K ◽  
Gazala Nazir ◽  
...  
Keyword(s):  
Surface Layer ◽  
Surface Soil ◽  
Soil Depth ◽  
Himachal Pradesh ◽  
Water Soluble ◽  
Organic Carbon Content ◽  
Total Sulphur ◽  
Total Sulphur Content ◽  
Organic Sulphur ◽  
Sulphate Sulphur

The current investigation was conducted to study the fractions of sulphur in nine districts of low and mid hills of Himachal Pradesh. For this purpose 31 representative soil sampling sites were selected from nine districts and the soil samples were analyzed for physicochemical properties and different fractions of sulphur (water soluble sulphur, exchangeable sulphur, available sulphur, non-sulphate sulphur, organic sulphur and total sulphur). The results indicated that the total sulphur in soils varied from 98.2 to 470.1 mg kg-1 in surface soil (0-15 cm) and 67.2 to 370.7 mg kg-1 in sub-surface layer (15-60 cm). The organic sulphur varied from 80.5 to 401.1 mg kg-1 in surface and 44 to 306.1 mg kg-1 in sub-surface layer. The water soluble sulphur, exchangeable sulphur, available sulphur and non-sulphate sulphur varied from 1.7 to 9.2, 2.7 to 18.4, 4.5 to 27.6 and 10.2 to 58.9 mg kg-1 respectively in surface soil and 0.5 to 5.4, 1 to 17.7, 3.7 to 23.5 and 12.5 to 50.2 mg kg-1, respectively in sub-surface soil. It was observed during course of study that with increase in the soil depth the content of different fractions of sulphur decreased. These soils had the major part of their total sulphur content in organic form followed by non-sulphate sulphur, available sulphur, exchangeable sulphur and water soluble sulphur. It can be concluded that the soil texture and organic carbon content played a major role in determining the quantity of different fractions of sulphur in these soils.

scholarly journals Sulphur Metabolism and Excretion Studies in Ruminants XII. Nitrogen and Sulphur Composition of Ruminal Bacteria

1973 ◽  
Vol 26 (6) ◽  
pp. 1429 ◽  
Author(s):  
PR Bird
Keyword(s):  
Nitrogen Content ◽  
Total Nitrogen ◽  
Dry Matter ◽  
Sulphur Content ◽  
Total Nitrogen Content ◽  
Sulphur Metabolism ◽  
Organic Form ◽  
Ruminal Bacteria ◽  
Total Sulphur ◽  
Total Sulphur Content

The total sulphur content of mixed ruminal bacteria from sheep fed two different diets was 0'41 and 0'45% of the dry matter, and 97% of this sulphur was in the organic form. The total nitrogen content was 8� 9 and 9� 0 % of the dry matter.

The Effects of Elemental Sulphur on Shoot Dry Weight, Nodulation and Pod Yield of Groundnut (Arachis hypogaea) under Irrigation

1987 ◽  
Vol 23 (1) ◽  
pp. 93-97 ◽  
Author(s):  
Tageldin M. Hago ◽  
M. A. Salama
Keyword(s):  
Arachis Hypogaea ◽  
Field Experiments ◽  
Dry Weight ◽  
Elemental Sulphur ◽  
Sulphur Content ◽  
Nodule Number ◽  
Pod Yield ◽  
Total Sulphur ◽  
Shoot Dry Weight ◽  
Total Sulphur Content

SUMMARYField experiments were carried out to study the effects of elemental sulphur on irrigated groundnut. The sulphur was applied at rates of 50, 100 or 150 kg ha−1, either at sowing, at flowering or in two equal splits at sowing and flowering. Shoot dry weight, total sulphur content of leaves, nodule number per plant and pod yield were all significantly increased by sulphur treatment, but nodule dry weight was unaffected. The greatest response lay at or below 50 kg ha−1 applied at sowing. There were no further increases in response above this level.

scholarly journals Total sulphur content in deposits of the Zofiówka monocline (sw part of upper silesian coal basin)

2013 ◽  
Vol 29 (3) ◽  
pp. 61-77
Author(s):  
Marek Marcisz
Keyword(s):  
Sulphur Content ◽  
Coal Basin ◽  
Total Sulphur ◽  
Total Sulphur Content ◽  
Upper Silesian Coal Basin

Streszczenie Dokonano charakterystyki zmian zawartości siarki całkowitej w 29 pokładach węgla kamiennego złóż Pniówek i Zofiówka, występujących w monoklinie Zofiówki - obszarze o podstawowym znaczeniu dla pol- skiej bazy węgli koksowych. Wytypowane do badań pokłady reprezentują warstwy siodłowe, rudzkie, załęskie i orzeskie, tj. pokłady gnip 500,400 i 300 (namur B - westfal B). Charakterystyki zmian S,d dokonano na podstawie utworzonej cyfrowej bazy danych obejmującej 2730 próbek, spośród których w 2661 oznaczono zawartość tego pierwiastka. Przeprowadzono podstawowe analizy statystyczne, za pomocąktórych określono m.in. liczbę próbek, w których oznaczono zawartość siarki całkowitej w poszczególnych pokładach, a także min., maks. oraz średnią zawartość tego pierwiastka w danym pokładzie. Prześledzono zmiany zawartości siarki całkowitej w układzie wertykalnym (wraz z głębokością) i horyzontalnym (w dwóch kierunkach: E-W oraz N-S). Wykreślono także mapy izoliniowe zawartości siarki całkowitej we wszystkich badanych pokładach węgla. Wyniki badań wykazały, że zawartość siarki całkowitej w badanych pokładach złóż monokliny Zofiówki zmienia się w zakresie od 0,21% S,d w pokładzie 406/1 do 2,18% S,d w pokładzie 361. Zawartość średnia siarki całkowitej w złożach monokliny Zofiówki wynosi 0,65% S,d. Nie wykazano żadnej ogólnej tendencji zmian zawartości siarki cał- kowitej. W każdym z pokładów obserwuje się odmienny charakter tych zmian. Przedstawione w artykule rezultaty stanowią część wyników uzyskanych w ramach projektu badawczego pt.: „Inteligentna koksownia spełniająca wymagania najlepszej dostępnej techniki”, opartego na współpracy nauki z przemysłem, realizowanego w ramach Programu Operacyjnego „Innowacyjna Gospodarka” i finansowanego w większości ze środków Europejskiego Funduszu Rozwoju Regionalnego.

Synthesis and characterization of micron-size pyrite crystals

2010 ◽  
Vol 25 (S1) ◽  
pp. S40-S44 ◽  
Author(s):  
Rong Wu ◽  
Ji-kang Jian ◽  
Le-tian Tao ◽  
Yan-long Bian ◽  
Jin Li ◽  
...  
Keyword(s):  
Reaction Temperature ◽  
Mixed Solvent ◽  
Volume Ratio ◽  
Synthesis And Characterization ◽  
Sulfur Source ◽  
X Ray Diffraction ◽  
X Ray ◽  
Micron Size ◽  
Surface Morphologies

Mixed solvent of ethanol and water using FeSO4⋅7H2O and (NH2)2CS as precursors with polyvinylpyrrolidone as surfactant was used to synthesize cubic FeS2 (pyrite) crystals. Crystalline phase and surface morphologies of the crystals were characterized by X-ray diffraction and scanning electron microscopy, respectively. Volume ratio of solvent, reaction temperature, reaction time, and sulfur source were found to be the key parameters for the formation of pure pyrite crystals. Optimal micron-size pyrite crystals were successfully grown from a mixed solvent of ethanol and water with a volume ratio of 3:2, heated to a reaction temperature of 180 °C, and maintained for 36 h with thiourea as the sulfur source.

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