Gas-phase combustion by C. H. Bamford

By C. H. Bamford

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E. -~ 2kZ = k5b (19) Z k4 [MI k 5 b + k1 l a [HZI where x k 4 [ M I =k4,H1C[HZ1 +k02[OZ1+kM[M]) the constants k o 2 and k M being obtained from experiments on the second limit (cf. Sect. 3). k S 6 is a rate coefficient for the destruction of HOz at the vessel wall, and it was assumed by Willbourn and Hinshelwood that their KC1 surface was an efficient surface for HOz destruction so that k 5 b is diffusion controlled. + -i Pi gij where pj denotes pressure and Qij denotes a binary diffusion coefficient at unit pressure.

Entage of H 2 0 2 present to increase with residence time. Anzilotti et al. [43] found a similar increase in H 2 0 2 with residence time, in contrast with the earlier result of Pease. It is possible that the residence times used by Holt and Oldenberg were too short for a stationary concentration to be achieved. The experiments of Linnett and Tootal [44]were carried out at 565 "C and a pressure of 230 tom, just above the second limit, with a Pyrex vessel washed with nitric acid and distilled water.

Ii) A t 480 OC, the limit rises if the evacuation is interrupted for a short period and falls again as the time of interruption is further increased ( F i g . 17). 025. With mixtures of low y , the maximum limit can be obtained either by using moderate withdrawal rates and interrupting the evacuation for the optimum period, or by using slow withdrawal rates without interruption. With fast withdrawal rates, even using the optimum interruption time, the limit is significantly below the maximum. With high mole fractions of 0 2 ,use of very slow withdrawal rates may cause complete suppression of the explosion.

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