Stripping rates

Bottoms and three side-cut strippers remove light ends from products and may utilize steam or reboilers. In Fig. 13-92 a reboiled stripper is utilized on the light distillate, which is the largest side cut withdrawn. Steam-stripping rates in side-cut strippers and at the bottom of the atmospheric column may vary from 0.45 to 4.5 kg (1 to 10 lb) of steam per barrel of stripped liquid, depending on the fraction of stripper feea hquid that is vaporizea. 

The lean glycol concentration is determined by the temperature of the reboiler, the gas stripping rate, and the pressure of the reboiler. Glycol concentrations between 98 and 99% are common for most field gas units. 

Minimizing over-stripping. Over-stripping can start a wheel with the absorber. A 10% cut in stripping rate can increase Cj s recover) by 0.8% (see Figure 9-12). 

FIGURE 18.11 A comparison of stripping rates for TCE and gasoline compounds. 

Stripping rates are also of importance in commercial operations, and these can be determined in a manner similar to those previously described. 

As can be seen in Fig. 1, CA = C A and C°x = Cl x. In the experiment, the concentration of lactic acid in the feed reservoir was maintained at a constant initial level, CL0. At steady state, the extraction rate in the extractor should be equal to the stripping rate in the back extractor, which can be... 

Coke(t), wt% = function for coke content vs time Kj, sec = stripping rate... 

Our investigations show that catalyst composition and architecture can have a significant effect on the initial quantity of adsorbed hydrocarbons, i.e. soft delta coke, as well as on stripping rate (table 4). A high zeolite content usually results in a high soft coke make, but not necessarily in a low stripping rate (cat. A vs B). At a constant activity, hard and soft coke make, the stripping rate increases with accessibility ( cat. B vs C). 

Soft coke The contribution of soft coke can be determined in the cyclic deactivation unit. The soft coke make depends both on physical and chemical properties, such as activity and catalyst accessibility. The initial soft coke is expected to increase with the zeolite content, stripping rates are higher for the very accessible catalysts. 

Experience has shown that edible fats and oils flavor and odor removal correlates well with the reduction of FFA. The odor and flavor of an oil with a 0.1 % FFA will be eliminated when the FFA is reduced to 0.01% to 0.03%, assuming a zero peroxide value. Therefore, all commercial deodorization consists of steam stripping the oil for FFA removal. Typical conditions practiced in the United States for the three deodorizer system types are shown in Table 23. The four interrelated operating variables that influence deodorizer design are vacuum, temperature, stripping rate, and retention time at deodorization temperatures. 

Figure 16. Soft delta coke and stripping rate.

From the foregoing we can expect that a resid catalyst based on a moderate zeolite content in a more highly accessible large-pore matrix system will have a double benefit for the reduction of soft delta coke, because the quantity of adsorbed hydrocarbons will be lower and the stripping rate will be higher (Figure 19). 

In summary, the quantity of soft coke seems to increase with the surface area in the small-pore range (zeolite and matrix), while the stripping rate is determined inversely by the accessibility of the catalyst sites and increases with larger and nonconstrained pore systems. We can conclude that for delta coke limited RFCC catalyst selection it will be essential to assess the diferences in all the factors contributing to commercial delta coke. 

Since these samples could be fully oven dried and accurately weighed, a comparison between the true balance-measured weight losses and the cumulative experimental stripping rates could be made. For the Bronze 3.0 a 80% chemical recovery was attained, but for the Bronze... 

Stripping rales are as important for process viability as extraction rates, but leas atlantion has been paid to their detemdnaiion. In principle, stripping rates should be related through microscopic reversibility to extraciion oues. but far from equilibrium the complete kinetics model is difficult to discern. 

YES- Plasma strip systems 40-50 kHz Stripping of thick Strip rate of 6,000-... 

Stripping rate of 5.1 rows per 12 hour shift per machine... 

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