Ultrasonic absorption in carbon dioxide/water vapour mixtures

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.

Download Full-text

The Diffusion of Carbon Dioxide and Water Vapour through Stomata

Journal of Experimental Botany ◽

10.1093/jxb/25.5.927 ◽

1974 ◽

Vol 25 (5) ◽

pp. 927-936 ◽

Cited By ~ 60

Author(s):

P. D. JARMAN

Keyword(s):

Carbon Dioxide ◽

Water Vapour

Download Full-text

An Evaluation of Five Carbon Dioxide Analysers for use in the Operating Theatre and Intensive Care Unit

Anaesthesia and Intensive Care ◽

10.1177/0310057x8701500216 ◽

1987 ◽

Vol 15 (2) ◽

pp. 212-216 ◽

Cited By ~ 7

Author(s):

D. G. Selby ◽

A. H. Ilsley ◽

W. B. Runciman

Keyword(s):

Carbon Dioxide ◽

Intensive Care Unit ◽

Intensive Care ◽

Water Vapour ◽

Operating Theatre ◽

Main Stream ◽

Time Stability ◽

Side Stream ◽

Stream Sampling ◽

Available Carbon

Five commercially available carbon dioxide analysers were assessed with respect to accuracy, response time, stability, the effect of water vapour and the effect of rebreathing. Two side-stream sampling analysers (Datex Normocap and Engstrom Eliza) and one main-stream sampling analyser (Hewlett-Packard Capnoshot) were found to be satisfactory for use both in the operating theatre and intensive care unit. The Instrumentation Laboratory (IL) 200, a side-stream monitor, performed satisfactorily but neither it nor the Siemens Sirecust 404, a main-stream monitor, has the facility to compensate for the presence of nitrous oxide. The Siemens analyser, in the form tested, could not be recommended for clinical use, as it was less accurate than the other monitors, could not detect rebreathing, and was subject to fluctuations when used with gas mixtures saturated with water vapour.

Download Full-text

A Study of Basic Zinc Carbonate Formation by the Action of Carbon Dioxide and Water Vapour on Zinc Oxide

Zeitschrift für Naturforschung B ◽

10.1515/znb-1974-3-415 ◽

1974 ◽

Vol 29 (3-4) ◽

pp. 202-205 ◽

Cited By ~ 1

Author(s):

M. F. O’Connor

Keyword(s):

Carbon Dioxide ◽

Zinc Oxide ◽

Water Vapour ◽

Zinc Carbonate ◽

Carbonate Formation ◽

Water Pretreatment ◽

Water Contents ◽

Gas Pressures

The absorption of carbon dioxide and water vapour by zinc oxide to form basic zinc carbonate was studied for a range of gas pressures and reaction temperatures. Water pretreatment of the oxide was found to influence the initial stages of the reaction. The CO2- and water-contents of the products varied according to the reacting conditions but in all cases a highly-disordered basic zinc carbonate was formed which showed an increase in order on ageing.

Download Full-text