Split feed

Piping to Burners - First and second stage piping and headers, as well as the burner lines themselves, are sized to minimize pressure drop and velocity effects. Thus, maldistribution of flow to the burners will be minimized. The burner lines are fabricated from standard 1(X) mm pipe, and are arranged in a split grid layout with distribution headers and split feed lines on opposite sides, for both first and second stage burners. First and second stage headers must be sloped so that any condensate will drain back to the seal drums. However, the burner lines must be accurately installed in a horizontal plane. 

Feed segregation. Split feed injection involves charging a portion of the same feed to a different point in the riser. This is another tool for increasing light olefins and boosting gasoline octane. 

Larger Zeolite Unit Cell Size AddZSM-5 Additive Higher Cat/Oil ratio Higher Mix Zone temperature Split Feed injection Riser Quench... 

Figure 18.5 Example 18-6 comparison of Sd/a for (a) single-stage PFR and for (b) three-stage PFR with split feed of B...

Newton, MA). Microfluidization based on patented technology in which a split feed stream flows into an interaction chamber at ultrahigh velocities and pressures (up to 1500 ft and 16,000 psi respectively). The two streams collide head-on and exit the chamber at a right angle to the collision. The force of the collision creates cavitation and shear forces to decrease the particle size. The feed stream was prepared in a manner similar to the coarse emulsion in which the orange oil was blended into the carrier solution with a whisk. The Microfluidizer was operated at a pressure of 11,000 psi and the sample was collected after one pass through the interaction chamber. 

As previously discussed, one possibility of increasing the reactor performance resides in the use of multiple feeds. In Figure 4dan example is presented of a "split-feed" condition the same amount of monomer and initiators considered in the example of Figure 3 was supposed to be fed part at the reactor inlet, part in a reactor zone immediately after the temperature peak as shown by the computed temperature and conversion profiles, a small increase in the monomer conversion can be obtained. 

In the split feed process, the additives are fed into the polymer melt via a side feeder downstream of the plastification zone. Here, gravimetric feeding is always used (see Fig. 4.32). 

Figure 432 Schematic representation of the production of a masterbatch using the split feed process...

Krishna, Ashok S. Gasoline octane enhancement in fluid catalytic cracking with split feed injection to a riser reactor, PCT International, WO 8702695 (1987). 

Split feed eonfiguration, in which the feed is split between the high-pressure and the low-pressure columns... 

Fig. 31 Schematic diagram of split-feed operation in continuous emulsion polymerization...

When a monomer split-feed operation based on the experimental result shown in Fig. 32 was applied, for example, to a continuous tubular pre-reactor with some backmixing, the number of polymer particles increased by about 30% at Mpi=0.02 g/cm -water, compared to the number produced in a batch reactor, as shown in Fig. 33. 

The monomer split-feed operation was also shown to work in a continuous stirred-tank pre-reactor. When certain conditions are fulfilled, the split-feeds... 

Increase of selectivity by means of split feed of reactants (U.S.A. 3546268 Britain 1208191). 

Figure 2.2 Various reactor Configurations (a) semibatch, (b) distillation reactor, (c) split feed, (d) cascade, (e) recycle reactor, and (/) side injection.

By splitting the HNO3 addition in this way, with high HNO3 concentrations only near the bottom of the column where the Th(N03)4 concentration was low, formation of a second organic phase was avoided. Conditions for second-phase formation are shown in Fig. 10.27. This split feed of HNO3 also reduced extraction of fission products. 

Figure 12,1. Adiabatic fixed bed reactor with three compartments and split feed.

Figure 12.2. Conversion and temperature profiles in an adiabatic fixed bed reactor with three compartments and split feed or intermediate cooling (schematic).

Generally, a split-feed Claus plant is used for acid gas with an H2S content of 15-50% by volume. A split-feed Claus plant is similar to the one in Figure 2-7 except that it sends a portion of the feed acid gas directly to the catalytic reactors. This step permits a higher ratio of air to H2S in the thermal sections, which results in a more stable partial-oxidation flame for low-concentration H2S acid gas. The experienced licensors and vendors of Claus plants are too numerous to list. 

Calculate for a column that is splitting feed containing 12 percent )wer-boiling component into a 90 percent pure distillate and a bottoms product ontaining only 0.6 percent lower-boiling component. 

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