Velocity gas linear

Acoustic transmission factor T Average linear gas velocity IX... 

Both reactors used 38.1 mm 0 tubes. The commercial reactor was 12 m long while the length of the laboratory reactor was 1.2 m. Except for the 10 1 difference in the lengths, everything else was the same. Both reactors were simulated at 100 atm operation and at GHSV of 10,000 h-1. This means that residence times were identical, and linear gas velocities were 10 times less in the lab than at the production unit. Consequently the Re number, and all that is a function of it, were different. Heat transfer coefficients were 631 and 206 in wattsWK units for the large and small reactors. 

In specifying settling chamber dimensions, gas flow velocities must be maintained below the reentrainment velocity (pick-up velocity) of deposited particulate. As a general guideline, linear gas velocities are kept below 10 ft/sec (600 ft/min = 304.8 cm/sec). This is satisfactory for most materials however, some low-density particulates are reentrained at lower velocities. 

Once the linear gas velocity of the carrier gas has been set, the splitter vent flow should be adjusted between 15 and 100 ml/min. Use lower values to improve detection and higher values to improve GC resolution and decrease column overload. 

A tubular reactor is considered in which the gas-phase reaction leads to a change in the molar flow rate and thus in the linear gas velocity. The reaction stoichiometry is represented by... 

The size of reactor is chosen to accommodate this holdup. The diameter is determined from the gas flow rate, q, together with, for example, an allowable superficial linear gas velocity, u (in lieu of an allowable (- AP)) D = (4qhru)m for a cylindrical vessel. The volume could be determined from an appropriate bed density, together with an overhead space for disengagement of solid and gas phases (we assume no carryover of solid in the gas exit stream). 

Column internal diameter (dc) None if linear gas velocity the same Narrower column sharper peaks... 

Methane is commonly used as a marker for measuring the gas holdup time (tm), which was done on a capillary column 25 m long by 0.25 mm ID by 0.25 pm film thickness. A retention time for methane of 1.76 min was obtained. Determine the average linear gas velocity (v) and the average volumetric flow rate (Fc). Explain how these values differ from the actual velocity and flows at the column inlet and outlet. 

Analyses performed on a 10 meter SP2100 capillary column, 50 1 split ratio, linear gas velocity 28.5 cm/sec, T j 120 -> 220°C at 5°/min, Perkin Elmer Sigma 3B w/FID interfaced to Spectra Physics SP4000 Data System. 

Fio. 8. Arrhenius plots for the carbon-oxygen reaction at different linear gas velocities in Zone III. [After R. J. Day, Ph.D. Thesis, The Pennsylvania State University, 1949.]... 

For reaction at the same temperature, it is of interest to predict the relative rates of the different gas-carbon reactions in Zone III, when using a sample of fixed dimensions, a constant linear gas velocity, and a fixed concentration of reacting gas in the main stream. Under these conditions. Equation (39) can be expressed as... 

A representation of this equation is in Figure 2.8, which shows the effect of h with changes in linear gas velocity. Equation 2.81 is that of a hyperbola having a minimum at velocity u =... 

For minimum analysis time high linear gas velocities are used so the first two terms on right side of Equation 2.119 may be neglected. Therefore,... 

C, linear gas velocity tv = 36 cm/sec, 3.14 vol% Hs. Tc center temperature, Tt surface temperature, CHl0 effluent water concentration 15). (Reprinted with permission from Advances in Chemistry Series. Copyright by the American Chemical Society.)... 

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