The pyrolysis of cellulose was carried out at high beating rates and at temperatures up to 823K. Under these conditions, which approach those prevalent during cigarette smoking, virtually no char is formed and the major gaseous products are the carbon oxides. The amounts of products formed vary both
The combustion of cellulose under conditions of rapid heating
β Scribed by C.F. Cullis; M.M. Hirschler; R.P. Townsend; V. Visanuvimol
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 349 KB
- Volume
- 49
- Category
- Article
- ISSN
- 0010-2180
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β¦ Synopsis
Studies were made of the combustion of cellulose using high heating rates and at temperatures up to 823K with varying concentrations of oxygen in the atmosphere. Under these conditions, which may be relevant to those which exist during cigarette smoking, the gaseous products are the same as those formed in the absence of oxygen and the carbon oxides are again the major components. If cbemicai control is assumed, the order of reaction in cellulose for the formation of each product gradually decreases with increasing oxygen concentration, tending towards a value of unity. Although the activation parameters (activation energy and preexponentiai factor) decrease when oxygen is introduced, these values are independent of oxygen concentration between 5 and 21 voi%.
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An experimental and modeling study of cellulosic char combustion under laminar gas flow conditions was conducted covering the temperature range of 473-1173 K with 0.03-0.21 oxygen mole fraction in the feed gas. A gas film mass-transport limited model accurately fits the combustion rates measured in
l Jstituierten (A) und substituierteri (13) Arihyclroglucosceinheiten zu betrachten. Im Falle von unter Homogenbedingungen synthetisierten Praparaten mit statistkcher