Connections reactors

Sev eral months before the accident, reactor 5 in the series was found to be leaking. Inspection showed a vertical crack in its stainless steel. It was removed for repairs, but it was decided to continue operation by connecting reactor 4 directly to reactor 6 in the series. The loss of the reactor reduced the yield but production continued with unreacted cyclohexane being separated and recycled at a later stage. 

The accident happened when the plant had to replace one of six reactors and rushed to refit the plant to bypass the disabled reactor. Scaffolding was jerry-rigged to support a 20-in. pipe connecting reactor four with reactor six, which violated industry and the manufacturer s recommendations. The reactor that failed showed stress crack corrosion. The only drawings for the repair were in chalk on the machine shop floor. Both ends of the 20-in. 

Higher conversions than those shown in Figure E8-8.1 can be achieved for adiabatic operations by connecting reactors in series with interstage cooling ... 

Figure 11.12 One-line diagram of a star-connected reactor system for reducing the fault level at the switchgear in the system.

Lack of passableness of blow-down pipeline connecting reactor gas cover with gas-type pressurizer while unit was being operated at rated power, 17.11.1994. 

A potassium mirror contacted with a soln. of 18-crown-6 in THF at —20°, after exactly 15 min the blue mixture filtered into a connected reactor, an equimolar amount of 2-oxetanone added, and the dianion quenched with methyl iodide - ethyl propionate. Y 70%. The unusual C-C bond fission is initiated by attack of potassium anions. F.e. and quenching with HCl s. Z. Jedlinski et al., J. Chem. Soc. Chem. Commun. 1988, 1261-2 details and apparatus s. J. Org. Chem. 54, 1500-1 (1989). 

A promising high surface area material for three-dimensional electrodes is reticulated carbon (RVC) or metal. This material has been used in the Retec cell, which is an undivided monopolar connected reactor utilising a bank of vertical foam cathodes (60 x 50 cm) with interspersed DSA anodes. It has been demonstrated [26], using a 0.4 m long cathode, that the concentration of Cu(II) (in sodium sulphate, pH = 2) can be reduced from 10 ppm to approximately 0.1 ppm in a single pass even in the presence of air saturated solutions. 

Lo et al. (2010) designed a novel Z-scheme MR (as shown in Figure 7.7) that put Pt/ SrXi03 Rh (H2-photocatalyst) and WO3 (02-photocatalyst) separately in two compartments of a connected reactor divided by a modified Nafion ion-exchange membrane to perform the H2O decomposition reaction under visible-light irradiation. The compartments of the linked twin reactor were filled with aqueous solution containing Fe /Fe as the electron-transfer facilitator. In this way, H2 and O2 can be generated separately. 

We can now calculate the following characteristic data degree of cyclohexane conversion, oxidation efficiency and production level. With the aid of the flowsheet simulation program the mass and heat balances can be determined and a scenario is prepared for undertaking experiments in an existing plant equipped with two series-connected reactors. The program comprised six experiments, with a planned maximum duration of 24 h each. The pressure during the experiments was kept constant. The plant was run at two feed flow rates with simultaneous variation of air supply and temperature. 

Five days prior to the explosion, on 27 March 1974, it was discovered that a vertical crack in reactor No. 5 was leaking cyclohexane. The plant was subsequently shut down for an investigation. The investigation that followed identified a serious problem with the reactor and the decision was taken to remove it and install a bypass assembly to connect reactors No. 4 and No. 6 so that the plant could continue production. 

Workshop 6.4- Connect Reactor Model to Fractionator Simulation I 46S... 

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