Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Stainless steel supports

Externally cast membranes are first formed on the iaside of paper, polyester, or polyolefin tubes. These ate then iaserted iato reusable porous stainless-steel support tubes inside diameters ate ca 12 mm. The tubes ate generally shrouded in bundles to aid in permeate collection. [Pg.303]

For the synthesis, diffusion limitation occurred rather than crystal formation limitation. Stirring resulted in more uniform, but thinner coatings. Pretreatment of the stainless-steel support with dilute template solution improved the crystal growth in the upper part of the channels. [Pg.399]

Figure 2. Scanning electron micrograph of a cross section of the porous stainless steel supported Re-containing carbon membrane. Magnification is x3000. 1 - the stainless support 2 - the Re-carbon layer 3- Re-particles on the membrane surface. Figure 2. Scanning electron micrograph of a cross section of the porous stainless steel supported Re-containing carbon membrane. Magnification is x3000. 1 - the stainless support 2 - the Re-carbon layer 3- Re-particles on the membrane surface.
Liu, Y. Dixon, A. Ma, Y. Moser, W. Permeation of Ethylbenzene and Hydrogen Through Untreated and Catalytically Treated Alumina Membranes Separation Science and Technology 25 (1990) 1511- 1521. Mardilovich, P. She, Y. Ma, Y. Rei, M. Defect-Free Palladium Membranes on Porous Stainless Steel Support AIChEJ 44(2) (1998) 310-322. [Pg.110]

Fig. 7.1. Bed of catalyst pieces for oxidizing S02 to S03. It is circular, 7 to 17 m diameter. Industrial S02 oxidation is done in a converter of 3 to 5 such beds, Figs. 7.6 and 7.7. Downward gas flows are 25 Nm3/minute per m2 of top surface. Active catalyst consists of a molten V, K, Na, Cs, S, O phase supported on a solid porous silica substrate, Chapter 8. A top layer of silica rock holds the catalyst in place. A bottom layer prevents the catalyst from sticking to the stainless steel support grid. Fig. 7.1. Bed of catalyst pieces for oxidizing S02 to S03. It is circular, 7 to 17 m diameter. Industrial S02 oxidation is done in a converter of 3 to 5 such beds, Figs. 7.6 and 7.7. Downward gas flows are 25 Nm3/minute per m2 of top surface. Active catalyst consists of a molten V, K, Na, Cs, S, O phase supported on a solid porous silica substrate, Chapter 8. A top layer of silica rock holds the catalyst in place. A bottom layer prevents the catalyst from sticking to the stainless steel support grid.
Sometimes it will be necessary to substitute not only parts of a production line but also the assembly of equipment as a whole. To facilitate this operation and thereby reduce time and radiation exposure, it can be advantageous to build the whole production line on a stainless steel support frame fitted with simple connections to electricity, water, and air supplies [4], The complete withdrawal of a production line from a box and the introduction of a new one can then be performed in a very short time. [Pg.72]

Figure 3.1 Simple air sampling cartridge with open-face particle filter (a) O-ring seal (b) filter holder (c) stainless steel support screen (d) particle filter (e) PTFE filter gasket ... Figure 3.1 Simple air sampling cartridge with open-face particle filter (a) O-ring seal (b) filter holder (c) stainless steel support screen (d) particle filter (e) PTFE filter gasket ...
A schemahc diagram of the DEMS apparatus is shown in Fig. 5. The electrochemistry compartment corrsists of a circular block of passivated htanirrm (a) that rests above a stainless-steel support (1) cormected to the mass spectrometer. The space between the cell body and the snpport is a Teflon membrane (j) embedded on a steel mesh (k) the membrane is 75 pm thick, has 50% porosity and pore width of 0.02 pm. The single-crystal disk (h) is the working electrode its face is in contact with the electrolyte solution and separated from the cell body by another Teflon membrane (i) that functions as a spacer to form a ca 100-pm thick electrolyte layer (j). Stop-flow or continnons-flow electrolysis can be performed with this arrangement. For the latter, flow rates have to be minimal, ca 1 pL/s, to allow ample time (ca 2 s) for the electrogenerated products to diffuse to the upper Teflon membrane. Two capillaries positioned at opposite sides of the cell body (b, e) serve as electrolyte inlet and outlet as well as connection ports to the reference (f) and two auxiliary Pt-wire electrodes (d, f). [Pg.285]

Thin film deposition for producing dense membranes has been presented in Sections 3.1.1 and 3.1.2. The processes can also be used to prepare porous membranes by adjusting the operating conditions. For example, transition metals and their alloys can be deposited on a porous ceramic, glass, or stainless steel support by the thin-film deposition process to produce porous metal membranes with small pore sizes [Teijin, 1984]. [Pg.67]

Guizard, C., F. Garcia, A. Larbot and L. Cot, 1989, An inorganic membrane made from the association of a zirconia layer with a stainless steel support, in Proc. 1st Ini. Conf. Inorg. Membr., Montpellier, France, p.405. [Pg.88]

Using a two-stage, single-pass module of food-grade dynamic metal oxide membrane on a sintered stainless steel support tube under a TMP of approximately 20 bars and a temperature of 50 C, Thomas et al. [1987] have successfully clarified apple puree with a juice yield of 86% and a steady state flux of about 85 L/hr-m. The quality of the clarified apple juice by this dynamic or formed-in-place membrane is excellent -sparkling looking and flavor retained. As much as 65% reduction in the total pectins has been attained. [Pg.201]

While the formed-in-place or dynamic hydrous zirconium oxide membranes on porous stainless steel supports have been studied mostly for biotechnology applications, they have also demonstrated promises for processing the effluents of the textile industry [Neytzell-de-Wilde et al, 1989]. One such application is the treatment of wool scouring effluent. With a TMP of 47 bars and a crossflow velocity of 2 m/s at 60-70°C, the permeate quality was considered acceptable for re-use in the scouring operation. The resulting permeate flux was 30-40 L/hr-m. Another potential application is the removal of dyes. At 45 C, the dynamic membranes achieved a color removal rate of 95% or better and an average permeate flux of 33 L/hr-m under a TMP of 50 bars and a crossflow velocity of 1.5 m/s. [Pg.234]

In a membrane approach the following molar compo on was applied in the presence of a perforated stainless steel support aerosil 200 1,1-adamantanamine 0.79, ammonia 39 and water 86(190 C, lldays). [Pg.423]

Figure 6 A DIH crystals (crystal size 200nni), B stainless steel support (pore size 60 im-700 im, Stork Veco B.V., The Netherlands), C and D ... Figure 6 A DIH crystals (crystal size 200nni), B stainless steel support (pore size 60 im-700 im, Stork Veco B.V., The Netherlands), C and D ...
Figure 10 a. Sem picture of a continuous MFI layer (top view) b. Sem picture of a cross section of the same two-layer stainless steel supported MFI layer (magnification 600x)... [Pg.430]

In this paragraph shortly the permeation measurement method is introduced, followed by various examples of permeation through a silicalite-1 membrane on a sintered stainless steel support. This includes unary and binary mixtures as a function of partial pressure, composition and temperature. Finally the present state of modelling permeation through silicalite-1 membranes is reviewed. [Pg.433]

In addition, a complete model will also take into account the molecular diffiision through the (stagnant) porous stainless steel support. [Pg.439]

Bulk or molecular diffusion, dominated by molecule-molecule colhsions in the gas phase. This type of diffusion becomes important for relatively large pore diameters or at high system pressures, and should be aplied for the stainless steel support layer. [Pg.440]

Application at high temperature requires robust and thermostable systems. Both for ceramically and stainless-steel-supported systems the thermostability has been demonstrated. So, in spite of the different thermal expansion coefficients, the asymmetric membrane remains intact. However, there are no data available on the resistance of zeolitic membranes to thermal stresses, as a result of, for example, large sudden changes in temperature. The siainless-steel-supported system seems the most promising configuration... [Pg.567]

Mardilovich PP, She Y, Ma YH, and Rei MH. Defect-free palladium membranes on porous stainless steel support. AICHE J. 1998 44 310-322. [Pg.104]

Different supports are used, (see Section 10.6.4) with different geometry (discs or tubes), thickness, porosity, tortuosity, composition (alumina, stainless steel, silicon carbide, mullite, zirconia, titania, etc.), and symmetry or asymmetry in its stmcture. Tubular supports are preferable compared to flat supports because they are easier to scale-up (implemented as multichannel modules). However, in laboratory-scale synthesis, it is usually found that making good quality zeolite membranes on a tubular support is more difficult than on a porous plate. One obvious reason is the fact that the area is usually smaller in flat supports, which decreases the likelihood of defects. In Figure 10.1, two commercial tubular supports, one made of a-alumina (left side) and the other of stainless steel (right side) used in zeolite membrane synthesis, are shown. Both ends of the a-alumina support are glazed and both ends of the stainless steel support are welded with nonporous stainless steel to assure a correct sealing in the membrane module and prevent gas bypass. [Pg.270]

FIGURE 10.1 Commercial a-alumina and stainless steel supports. [Pg.271]

Nishiyama N, Koide A, and Egashira Y. Mesoporous MCM-48 membrane synthesized on a porous stainless steel support. Chem Commun 1998 19 2147-2148. [Pg.314]


See other pages where Stainless steel supports is mentioned: [Pg.405]    [Pg.395]    [Pg.374]    [Pg.247]    [Pg.421]    [Pg.374]    [Pg.428]    [Pg.302]    [Pg.304]    [Pg.312]    [Pg.416]    [Pg.308]    [Pg.5]    [Pg.405]    [Pg.178]    [Pg.353]    [Pg.395]    [Pg.98]    [Pg.435]    [Pg.98]    [Pg.78]    [Pg.127]    [Pg.26]    [Pg.27]    [Pg.431]   
See also in sourсe #XX -- [ Pg.317 ]




SEARCH



© 2024 chempedia.info