Vapours

About: Vapours is a research topic. Over the lifetime, 1153 publications have been published within this topic receiving 15022 citations.

Effect of Acetic Acid Fumigation on Common Storage Fungi of Some Medicinal and Aromatic Seeds

Abstract: urvey of common storage fungi of some medicinal and aromatic seeds, i.e. anise, coriander, cumin and fennel, indicate that Aspergillus niger and Penicillium sp. were the most dominant fungi associated with stored seeds. A. niger occupied the first order with all tested seeds except Penicillium sp. with anise seeds. Four concentrations of acetic acid vapours were tested against linear growth and spore germination of isolated fungi. Acetic acid vapours at 8 l/l caused complete inhibition of linear growth and spore germination of all tested fungi. Seeds at different levels of moisture content were fumigated with acetic acid vapours for 60 min in a fumigation chamber, then examined for fungal infection. Acetic acid vapours at 0.3ml/l caused complete protection of natural infection of all tested seeds at low moisture content. Complete protection of fungal natural infection was obtained with acetic acid vapours at 0.125ml/l for all tested seeds at moderate and high moisture content. Medicinal and aromatic seeds at moderate and high moisture content were more sensitive to acetic acid vapours. It could be suggested that acetic acid vapours could be safely used commercially for controlling storage natural infection of medicinal and aromatic seeds during storage.

Purification of vapours containing fluorine compounds

Abstract: 1,179,366. Purifying vaporized fluorine-containing compounds. L. A. MITCHELL Ltd. 26 March, 1968 [3 May, 1967], No. 20419/67. Heading B1L. Impurities in vapour streams which camprise fluorine compounds and water vapour are removed by scrubbing the vapour stream with an aqueous liquid which does not absorb the fluorine compounds but which does absorb the impurities, at such a temperature as does not cause substantial condensation of the water vapour present. Thus vapours from tank I containing HF, SiF 4 and water vapour as well as phosphoric acid as impurity pass to scrubber 5 where they are .scrubbed with aqueous fluosilicic acid of 30-70% concentration by weight, which absorbs the entrained phosphoric acid but does not absorb the HF or SiF 4 . Scrubbing conditions, e.g. pressures of 5-29 ins. Hg and temperatures of 25-95‹C are such that no condensation of water vapour occurs. Liquid effluent leaves by line 6 and is returned for further scrubbing by line 9. The purified vapour stream passes by line 13 to scrubber 14 where it is scrubbed with fluosilicic acid of less than 30% concentration. The HF and SiF 4 are absorbed therein and are subsequently recovered by conventional methods from the liquid effluent which passes by line 15 to vessel 16. The vapours passing on to scrubber 23 are condensed with water and passed to waste by line 24.