J-bend

Sometimes insufficient differential across the regenerated catalyst slide valve is not due to inadequate pressure buildup upstream of the valve, but rather due to an increase in pressure downstream of the slide valve. Possible causes of this increased backpressure are an excessive pressure drop in the Y or J-bend section, riser, reactor cyclones, reactor overhead vapor line, main fractionator, and/or the main fractionator overhead condensing/cooling system. 

The pressure drop in the Y or J-bend section could be from improper fluidization or a flaw in the mechanical design. There are often fluffing gas distributors in the bottom of the Y or along the J-bend that are designed to promote uniform delivery of the cataly.st into the feed nozzles. Mechanical damage to these distributors or too little or too much fluffing gas affect the catalyst density, causing pressure head downstream of the slide valve. 

Lee, B. H. Nishii, J., Bending sensitivity of in series long period fiber gratings, Opt. Lett. 1998, 23, 1624 1626... 

Fig. 10.7 Top view (a), cross section along AA (b), and side view (c) of the four channel IO YI sensor W, indicates the sensing window on channel i, dtj indicates the distance between channels i and j, / bend and bend are the radius of 90° bend and S bends, respectively, W is the width of the...

Pohl, R. J., Bend, J. R., Guarino, A. M., and Fouts, J. R. Hepatic microsomal mixed-function oxidase activity of several marine species from coastal Maine. Drug Metab. Dispos. (1974) 2 545-555. 

Organic Spectroscopic Analysis R J Anderson. D J Bended and P W Groundwater... 

Absorption of N2O starts below about 210 nm (2). The absorption spectrum in the 172-197 nm region has recently been studied by Selwyn and Johnston (96). The spectrum consists of a weak continuum superimposed on diffuse bands of v-J bending mode which increased in intensity with temperature. The transitions observed are probably X- -E+ and lA - xl +. Photodissocia-... 

POHL, L.R. (1979) Biochemical toxicology of chloroform. In Reviews of Biochemical Toxicology, Vol. 1, edited by J.Bend, R.M.Philpot and E.Hodgson (Amsterdam Elsevier-North Holland). PRESCOTT, L.F. (1983) Paracetamol overdosage pharmacological considerations and clinical management. Drugs, 25, 290. 

Grau, C.R. A.E. Dorrance J. Bend J.S. Russin. Fungal diseases. Soybeans Improvement, Production and Uses. H.R. Boerman, J.E. Specht, Eds. American Society of Agronomy Madison, WI, 2004 pp. 679-764. 

Hudson P, Verschuur W, Lawton R, Parker D, Reason J. Bending the rules 11 why do people break rules or fail to foUow procedures, and what can you do about it 1998. 

Jerina 0., Lehr R., Yagi H., Hernandez 0., Dansette P., Wislockl P., Wood A., Chang R., Levin W. and Conney A. 1976 in de Serres F., Fouts J., Bend J. and Philpot R. (eds) In Vitro Metabolic Activation in Mutagenesis Testing, Elsevier, Amsterdam... 

Professor J. Bend, Department of Pathology, Siebens-Drake Medioal Researoh Institute, Sohulich Sohool of Medioine Dentistry, University of Western Ontario, London, Ontario, Canada... 

Calculate and the properties u, and C° at 1000 K of the three electron torsion of isobutene, of the (H—C—C)j. bend and the C—C, C=C and C—stretches. The wavenumber of the twisting of the double bond of isobutene is 700 cm (Table 1.8), that of the twisting of a corresponding three-electron bond is therefore 350cm l ( 2.2.b). The wavenumbers of other vibrations can be found directly in Table 1.8. The following table can therefore be established using equations (18) to (21) ... 

The latest model is known as Exxon Flexicracker (Figure 22) (56). In this model, the U-tubes are replaced by a standpipe that is followed by upwardly sloped laterals, referred to as J-bends. This model takes advantage of riser cracking and spent catalyst in the J-tube is controlled by a slide valve. Reactor temperature is controlled by pressure differential between the regenerator and reactor. 

The Euler angles and two shear angles are used to describe the cross-sectional displacement of the beam under twisting, bending and shear deformations. Apply tortuosity j/, bending rotation 6, twisting rotationj, shear rotations of and (p to the associated axes, we have ... 

Nakayama J. Bending method for direct measurement of fracture surface energy of brittle materials. Japan J App Phys 1964 3(7) 422-423. 

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