Limiting densities and molecular weights of oxygen; carbon dioxide, sulphur dioxide and hydrogen sulphide.—Atomic weights for carbon and sulphur

1939 ◽  
Vol 35 (0) ◽  
pp. 1439-1452 ◽  
Author(s):  
E. Moles ◽  
T. Toral ◽  
A. Escribano
Keyword(s):  
Carbon Dioxide ◽  
Hydrogen Sulphide ◽  
Sulphur Dioxide ◽  
Molecular Weights

New Observations on the Low Temperature Reaction between Hydrogen Sulphide and Sulphur Dioxide : A Novel Method for Analysing Milligram Quantities of Hydrogen Sulphide in the Presence of Carbon Dioxide

1959 ◽  
Vol 12 (3) ◽  
pp. 424 ◽  
Author(s):  
IK Gregor ◽  
RL Martin
Keyword(s):  
Carbon Dioxide ◽  
Low Temperature ◽  
Hydrogen Sulphide ◽  
Sulphur Dioxide ◽  
High Vacuum ◽  
Temperature Reaction ◽  
Liquid Sulphur ◽  
Vacuum Method ◽  
Novel Method ◽  
Vacuum Fractionation

When an anhydrous mixture of liquid hydrogen sulphide and liquid sulphur dioxide contained in a sealed tube at -78 �C is gently warmed, the liquid remains clear until the temperature reaches c. -40 �C, when sulphur is slowly deposited. Careful measurements reveal that the two compounds always react in the mole ratio, H2S : SO2 = 3 : 2, which contrasts with the stoichiometric equation 2H2S + SO2 =2H2O + 3S, widely quoted for their reaction in the moist gaseous phase or in aqueous solution. This low temperature reaction forms the basis of a novel high vacuum method for estimating milligram quantities of hydrogen sulphide when in the presence of gases, such as carbon dioxide, whose volatilities are sufficiently similar to preclude the use of normal low-temperature vacuum fractionation methods.

A comparison of the compressibilities of some gases with that of nitrogen at pressures below one atmosphere

1950 ◽  
Vol 200 (1061) ◽  
pp. 201-218 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Differential Method ◽  
Linear Extrapolation ◽  
Volume Changes ◽  
Pure Nitrogen ◽  
Molecular Weights ◽  
Nitrous Oxide Oxygen ◽  
The Individual ◽  
Straight Lines ◽  
High Degree

A differential method for comparing the compressibilities of gases at pressures below 1 atm. has been developed in which many of the errors inherent in methods employed previously have been to a large extent eliminated, especially those due to meniscus volume changes and capillary depression. Using pure nitrogen as a standard the low-pressure isothermals of carbon monoxide, carbon dioxide, nitrous oxide, oxygen, ethylene and propane have been determined at a temperature of 22-05° C. The deviations of the individual points from straight lines do not in most cases exceed 2 parts in 100,000. In no case, even with propane, was any curvature in the isotherms detectable. The contention of Moles and other recent workers that the molecular weights of liquefiable gases can be determined to a high degree of accuracy by linear extrapolation is rendered highly probable by this fresh evidence.

RUMEN GAS ANALYSIS BY GAS-SOLID CHROMATOGRAPHY

1961 ◽  
Vol 41 (2) ◽  
pp. 187-196 ◽  
Author(s):  
J. M. McArthur ◽  
J. E. Miltimore
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Hydrogen Sulphide ◽  
Sample Volume ◽  
Gas Analysis ◽  
Complete Analysis ◽  
Thermal Detector ◽  
Thermal Detection ◽  
Methane Carbon

Methods are described for sampling and analysing rumen gases. The analysis requires less than 15 minutes for the determination of hydrogen, oxygen, nitrogen, methane, carbon monoxide, carbon dioxide, and hydrogen sulphide, i.e., for all gases occurring in the rumen. The method is sensitive and requires only a small quantity of sample, and the sample volume need not be known. The presence of water or other vapours in the sample does not influence the results. Relative thermal detector responses have been determined for gases which occur in the rumen. These eliminate the necessity for the calibration of gas chromatographs using thermal detection. The first complete analysis of rumen gas is presented.

scholarly journals IoT Based Underground Drainage Monitoring System

2020 ◽  
Vol 9 (3) ◽  
pp. 247-249
Keyword(s):  
Carbon Monoxide ◽  
Nitrogen Oxide ◽  
Monitoring System ◽  
Hydrogen Sulphide ◽  
Sulphur Dioxide ◽  
Smart Phone ◽  
Threshold Value ◽  
Ammonia Nitrogen ◽  
Network System

Underground drainage monitoring system plays an important role in keeping the cities clean and healthy. Compared to other countries, India consists of highest number of sewage workers. Exposure of sewage workers to poisonous gases like hydrogen sulphide, sulphur dioxide, carbon monoxide, methane, ammonia, nitrogen oxide increases the death of the sewage workers. The main aim of this project is to design a network system which helps in monitoring poisonous gases present in sewage. Whenever the gas level crosses the threshold value, the information with different gas ppm values is displayed in the smart phone through the app. It also indicates whether it is safe for the manual scavengers to work in the environment or not.

scholarly journals Performance Evaluation of Design AD System Biogas Purification Filter

2018 ◽  
Vol 3 (1) ◽  
pp. 17-27 ◽  
Author(s):  
Ejiroghene Kelly Orhorhoro ◽  
Oghenero Wilson Orhorhoro ◽  
Eruero Victor Atumah
Keyword(s):  
Carbon Dioxide ◽  
Performance Evaluation ◽  
Water Vapour ◽  
Hydrogen Sulphide ◽  
Activated Charcoal ◽  
Preliminary Test ◽  
Decision Matrix ◽  
Percentage Composition ◽  
Detail Design ◽  
Biogas Purification

Biogas purification which is the removal of impurities so as to improve the efficiency of gas produced, ensure the safety of end users and prolong the life of the equipment cannot be neglected. This paper is focused on the design and performance evaluation of AD system biogas purification filter. Three different conceptual designs were generated from possible design consideration, feasibility study and preliminary test and with the help of decision matrix; the best conceptual design was selected from which the purification filter was fabricated. The selected concept for detail design was a transparent polyethene cylindrical purification filter fitted with local iron sponge containing activated charcoal and local potash. The reagents were arranged in this order; local potash for the removal of water vapour and carbon dioxide followed by activated charcoal which serves as a purifying agent for hydrogen sulphide. The results obtained showed reduction in percentage composition of hydrogen sulphide (H2S), carbon dioxide, and water vapour. On the other hand, there was an increase in percentage composition of methane (CH4) which is an indication of improvement in methane production after purification. The outcomes of the results obtained were satisfactory and the combination of local potash and activated charcoal was adequate for biogas purification.

scholarly journals On the Formation of COS from H2S and CO2 in the Presence of Zeolite/Salt Compounds

1998 ◽  
Vol 16 (7) ◽  
pp. 577-581 ◽  
Author(s):  
Wolfgang Lutz ◽  
Andreas Seidel ◽  
Bruno Boddenberg
Keyword(s):  
Carbon Dioxide ◽  
Ion Exchange ◽  
Hydrogen Sulphide ◽  
Calcium Ions ◽  
Gaseous Mixture ◽  
Degree Of Conversion ◽  
Low Level ◽  
Sodium Cations

A gaseous mixture of hydrogen sulphide and carbon dioxide (20% H2S, 80% CO2) was brought into contact at 25°C with NaY and NaX zeolites in an as-synthesized form as well as after modification by the inclusion of salts (NaCl, NaBr) in the small cages of the aluminosilicate framework and ion exchange with aqueous CaCl2 solution. At small contact times (5 h), the degree of conversion of H2S according to the reaction H2S + CO2 → COS + H2O by the various samples was found to follow the sequence NaY/NaCl ≈ NaY/NaBr ≈ NaX/NaCl(CaCl2) < NaY « NaX/NaCl ≈ NaX. Long-term runs with NaY and NaY/NaBr revealed that the latter zeolite retained a very low level of H2S conversion for contact times as long as 250 h. It is concluded that such low H2S conversion requires the absence of low-coordinated sodium cations in the supercages or their replacement by calcium ions, and blocking of the β-cages with salt anions.

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