Topic
Vapours
About: Vapours is a research topic. Over the lifetime, 1153 publications have been published within this topic receiving 15022 citations.
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TL;DR: In this paper, an apparatus has been developed which permits shale oil vapours generated in one fluidized bed to pass over selected substrates in a second fluidised bed, and carbon deposition onto the solid is monitored in real-time by combusting pyrolysis products and measuring the oxides of combustion with an online mass spectrometer.
4 citations
TL;DR: In this article, a model for inert gas desorption of three single organic vapours from a highly activated carbon into a finite volume is proposed, which takes into account the internal as well as the external mass transport resistance.
Abstract: Inert gas desorption of three single organic vapours from a highly activated carbon into a finite volume is investigated theoretically and experimentally. A model is proposed, which takes into account the internal as well as the external mass transport resistance. Inside the pellet two mechanisms, surface flow and gas-phase diffusion, contribute to the total desorption flux. In most experiments suface flow was found to be the dominant transport phenomenon. The analytical solution presented relates the desorption conversion rate to four dimensionless parameters, which can be calculated a priori. For all sorptives, the fitting parameters tortuosity μ and ratio of surface to molecular diffusivity Ds/Dog were found to be identical. Moreover, Ds/Dog does not depend on the desorption conditions, such as total pressure, temperature, concentration range and amount adsorbed.
4 citations
4 citations
TL;DR: In this paper, a light and portable organic vapours monitor was developed using piezoelectric (P/Z) quartz crystal to determine Volatile Organic Compounds (VOCs) commonly found in workplace air.
Abstract: A light and portable organic vapours monitor has been developed using piezoelectric (P/Z) quartz crystal to determine Volatile Organic Compounds (VOCs) commonly found in workplace air. Out of the eight coating material studied, High Vacuum Grease (HVG) was found to be the best for determining commonly encountered organic vapours such as 1,1,1-Trichloroethane, Chloroform, Benzene and Toluene in room air. The optimised coating weight was 23 μg HVG at a flow rate of 200 mL/min. Moisture was found to interfere and the use of a Nafion gas dryer was found to reduce the relative humidity to a constant 37 % for room air with 43–81 % relative humidity. Under optimised conditions, a mean sensitivity of 1.9 × 1−2 Hz/ppm was obtained for total VOCs with 17.2% RSD variation towards different VOCs. Excellent linear working ranges were obtained from 40 to 2400 ppm (v/v), with response time and recovery time within one minute up to 500 ppm (v/v) of analyte. High and relatively constant response factors were obta...
4 citations