Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

CHETAH criteria

When analysing the resulte it is noticed this time that criterion C4 is the least severe of the four CHETAH criteria. It emphasises the unstable property of nitroaniline but under mates the instability of ammonium nitrate and ammonium dichromate for which there is no indication of danger whatsoever. [Pg.116]

Ozone is a highly endothermic substance. Its enthalpy of formation reaches 2.96 KJ/g, which makes it very unstable thermodynamically by CHETAH criterion Ci. In the liquid or solid state, it detonates spontaneously. [Pg.170]

Benzene and toluene form complexes with some salts these complexes are often very unstable. With silver perchlorate, benzene gives rise to a complex that leads to very dangerous benzenic solutions. Besides, it detonates when it is ground up. its enthalpy of formation corresponds to -3.4 kJ/g, which makes it dangerous according to the CHETAH criterion (see para 2.3.2). [Pg.247]

The CgHs-N Cl- (benzenediazonium chloride) enthalpy of decomposition was calculated. Comparing its value (AH j = -1.5 kJ/g) with the CHETAH criterion C, makes it moderately stable. Accidents have been observed during reactions that are schematised below and these illustrate what has been stated. They are all due to the explosive character of the diazonium sulphides formed. Here is one example ... [Pg.288]

The enthalpy of decomposition of this peracid is relatively high (AHcj = -1.83 kJ/g - average risk according to CHETAH criterion C,). Its aqueous solutions are unstable. Solutions that contain 80% of peracid detonate when they are stirred (even at -10°C). The usual way of preparing this peracid involves the effect of hydrogen peroxide when metaboric acid is present however, although this operating method was followed, serious accidents have occurred. [Pg.315]

TABLE 2.11 Degree of Hazard in Relation to the Oxygen Balance (CHETAH Criterion 3) ... [Pg.43]

The enthalpy of decomposition, which is rather low compared with criterion C, in the CHETAH programme (see p.117), was determined by DSC and corresponds to 0.76 KJ/g at 230-260°C. In a confined atmosphere the decomposition conditions would be explosive. This reaction has been used many times because of its spectacular aspect. This is why it is called Vesuvius fire by artificers and green volcano by lecturers. These demonstrations should be stopped because of the detonation risks they represent as well as chromium (III) oxide toxicity. [Pg.201]

The "Y" Criterion. The fourth criterion for hazard potential classification in the CHETAH program takes into account the number of atoms in a molecule of the substance involved, and is called the "Y" criterion. It is defined as follows ... [Pg.42]


See other pages where CHETAH criteria is mentioned: [Pg.117]    [Pg.113]    [Pg.116]    [Pg.118]    [Pg.236]    [Pg.119]    [Pg.157]    [Pg.169]    [Pg.15]    [Pg.41]    [Pg.41]    [Pg.2283]    [Pg.136]    [Pg.216]   
See also in sourсe #XX -- [ Pg.101 , Pg.117 ]




SEARCH



CHETAH

CHETAH SAFETY CRITERIA

© 2024 chempedia.info