3. Impact assessment: thermal energy
3.1 Heat of reaction
In the fine chemicals industry, most reactions are exothermic, i.e. they involve the release of heat. The potential damage caused by a loss of control of a reaction is obviously linked to the energy released. This is why the heat of reaction is one of the key data used to assess the risks involved in industrial-scale production.
The Joule (J) unit of energy is related to other common units as follows:
1 J = 1 N m = 1 W s = 1 kg · m 2 · s –2
1 J = 0.239 cal or 1 cal = 4.18 J
The energy units commonly used are :
molar enthalpy of reaction: ΔH ...
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Impact assessment: thermal energy
Assessment of runaway probability
Bibliography
Software tools
CHETAH CHETAH. – The ASTM chemical thermodynamic and energy release evaluation program. ASTM, 1916 Race street, Philadelphia, Pa 19103, 1974.
AKTS: Advanced Kintetics and Solutions, AKTS AG http://www.akts.com ,Techno-pôle 3960 Siders, Switzerland
Websites
HARSNET Thematic network on hazard assessment of highly reactive systems http://www.harsnet.net/
Source of physico-chemical data: The NIST chemistry Webbook (National Institute of Standard and Technology) http://www.webbook.nist.go./chemistry
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