Big Chemical Encyclopedia

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

Articles Figures Tables About

Sponge recovery

Studies indicate that isopropyl alcohol may be substantially better absorbed by the dermal route than had previously been believed, although significant toxicity by this route would require prolonged exposure. Delayed dermal absorption rather than inhalation may account for a number of pediatric poisonings that have occurred after repeated or prolonged sponged bathing with isopropyl alcohol to reduce fever. In several cases symptoms have included respiratory distress, stupor, and coma. Recovery was complete within 36 hours. Hypersensitivity characterized by delayed eczematous reactions have occasionally been observed after dermal contact with isopropyl alcohol. ... [Pg.413]

The behavior of liquids in narrow tubes is one of the most common examples in which capillary forces are involved. It will be shown later how important this phenomenon is in many different parts of everyday life and technology. In fact, liquid curvature is one of the most important physical surface properties that requires attention in most of the application areas of this science. The range of these applications is from blood flow in the veins to oil recovery in the reservoir. Properties of fabrics are also governed by capillary forces (i.e., wetting, etc.). The sponge absorbs water or other fluids where the capillary forces push the fluid into the many pores of the sponge. This is also called wicking process (as in candlewicks). [Pg.18]

For example, the capillary forces mentioned in Chapter 1 become extensively involved in the movement of water through a sponge. Sponges consist of many interconnected capillaries. An oil reservoir can be considered a simplified model of a sponge. If the reservoir is finely pored and sponge-like, then oil recovery is very poor (less than 30%), while if the pores are of large diameter, then recovery will be very high (over 60%). [Pg.213]

Table 1 summarizes some representative solvents or solvent systems for cellulose. The xanthate system has been used for a longtime to make viscose rayon and sponge. However, rayon production, where H2S is released to varying amounts during the recovery system of spent solvent, is shrinking because of environmental issues. On the other hand, cellulose is soluble in aqueous NaOH alone under limited conditions. Microcrystalline cellulose with DP 200—300 is soluble in 6—9% NaOH by freezing and defrosting procedures. Pretreatments of cellulose such as steam explosion are necessary for complete dissolution in the aqueous NaOH for normal bleached wood pulp and cotton linters with DP of more than 500. ... [Pg.522]

Evans et al. used the same reaction conditions for ether formation in the synthesis of lonomycin A [8]. The hindered alcohol in a cyclic polyether was efficiently methylated with trimethyloxonium tetrafluoroborate and Proton Sponge (1) (5 equiv. each, 0 °C) to give the desired ether along with 16% recovery of the starting material (Scheme 8.3). In this reaction, other methylation conditions examined were ineffective, and elevated temperature caused the decomposition of the starting polyether. De Brabander et al. reported the selective formation of anisole derivative from phenol using Meerwein s salt and Proton Sponge (1) in combination, without formation of isocoumarin by-products [9,10] (Scheme 8.3). [Pg.252]

Fig. 13.4a-f. Posttraumatic HFP with bilateral fistulae. a Left internal iliac artery angiography shows a fistula, b Selective left IPA. c After closure of the fistula with gelatin sponge, d Selective right IPA shows a second fistula, e Microcatheter in superse-lective position, f End result after embolization with gelatin sponge. Patient had a full recovery and regained normal erectile... [Pg.230]

Sponges for recovery spilled oil material for toxin adsorption... [Pg.371]

The overall recovery efficiency, from vanadium trichloride to metal sponge, is 96 to 98 per cent. Typical vanadium and impurity contents are as follows ... [Pg.271]

FIGURE 16.11 Densification of two cubic-shaped sponges into small pellets (a flat carpet and a spherical particle, respectively) and fidl recovery to original structure upon ethanol absorption. [Pg.235]

Sponge coke, 46—48, 70 Stack damper, 317-318, 320 process heaters, 317 Stacked paper plates, 94 Stainless steel, 416-418, 424-425 field identification of pipe, 417-418 cracking, 424-425 Start-up stack, 123 Start-up tips (sulfur plant), 134 Start-up (pump cavitation), 246-247 Start-up (sulfur recovery), 122-124 oxygen supply, 123 atmospheric vent, 123-124... [Pg.267]


See other pages where Sponge recovery is mentioned: [Pg.252]    [Pg.252]    [Pg.427]    [Pg.109]    [Pg.297]    [Pg.387]    [Pg.165]    [Pg.320]    [Pg.168]    [Pg.76]    [Pg.17]    [Pg.923]    [Pg.427]    [Pg.387]    [Pg.320]    [Pg.106]    [Pg.109]    [Pg.297]    [Pg.98]    [Pg.143]    [Pg.519]    [Pg.247]    [Pg.389]    [Pg.209]    [Pg.448]    [Pg.444]    [Pg.656]    [Pg.352]    [Pg.109]    [Pg.297]    [Pg.357]    [Pg.1284]    [Pg.28]    [Pg.263]    [Pg.54]    [Pg.224]    [Pg.234]    [Pg.235]    [Pg.24]   
See also in sourсe #XX -- [ Pg.252 ]




SEARCH



Sponges

© 2024 chempedia.info