Showing papers on "Vapours published in 1979"

A Novel Technique for the Sampling and Gas Chromatographic Analysis of Vapours

Abstract: A conventional pyrolysis gas chromatography system has been adapted to the analysis of vapours. A Curie point pyrolysis wire is used as a holder for granular active carbon on which the sample can be adsorbed. Desorption is achieved in the pyrolysis unit, but no pyrolysis occurs. The present study reports on the completeness of adsorption by the sampler and on the degree of release of adsorbate from it.

Effects of monoterpenes on Fomes annosus (Fr.) Cooke and its phenol oxidase activity

Abstract: Fomes annosus was cultivated subject to vapours of monoterpenes. Three monoterpenes were tested separately: α-pinene, β-pinene and 3-carene. The terpenes inhibited the dry matter production of the fungus but extracellular phenol oxidase activity was increased, particularly when the fungus was exposed to vapours of β-pinene and 3-carene.

Odorous and offensive vapour treatment - by spraying with water and oxidising agent after removing condensable constituents

Abstract: Vapours contg. offensive or foul smelling constituents from organic sulphides, amines, aldehydes, ketones, alcohols etc. are treated by passing through a condensing zone to remove condensible constituents, and spray treating uncondensed vapours. Spray treatment is by (a) passing uncondensed vapours into the upper region of a spray zone, (b) introducing a finely divided spray of water and oxidising agent, droplet size up to 10 mu, into the upper region of the zone, (c) allowing the droplets to fall unimpeded through the zone for >=20 seconds removing the offensive and foul smelling constituents, and (d) separately removing treated vapour and settled out spray liq from the lower part of the zone. The process uses lightweight component elements and has lower power requirements, e.g. a fan of only 10 horsepower is sufficient for a vapour flow of 1100 ft/3min. It is economical and its physical location is flexible e.g. it can be roof mounted.

Sampling and analysis of organic solvent vapours--with special reference to sampling tubes for a short time and for the working period.

Abstract: The present paper concerns the sampling and analysis of organic solvent vapours for a short period of time and for the working period. Porous polymer beads, Porapak Q, was applied to the adsorbent of the sampling tube for mixed vapours of aromatic compounds (benzene, toluene and xylenes). The adsorbent was packed in stainless steel column of a suitable size, and the adsorbed vapours were released by heating in the flasher then analysed by gas chromatography. The concentrations of the mixed vapours could be measured simultaneously with sufficient recoveries at the ordinary concentrations in the working yeard. The sampling conditions by pumps and the practical recoveries were tested. Being sucked with the vacuum pump using a Gastek detection tube (100 ml), the recoveries proved to be almost 100%. Being sucked with portable diaphragmatic pumps at a slow flow rate (22 ml/min), the recoveries were constant with only small variations. At a relatively fast flow rate (220-230 ml/min), the recoveries were not so high as those at the slow flow rate. These findings indicate that the sampling tube with Porapak Q is useful for aromatic compounds not only as a room air sampler for a short period of time but also as a personal air sampler.

Shredded sugar-beet drying - by contact with back-pressure turbine steam and using vapours in process

Abstract: Shredded sugar best roots are dried in the sugar refineries before use as animal feeding stuff by indirect contact with steam in tubes which are welded together to a revolving paddle mechanism The drying vapours are condensed and used in the process; the condensed heating steam serves as feed water for a boiler This utilises the heat in the drying vapours and eliminates pollution of the environment by the vapour emission