Disk evaporator

This type of apparatus is convenient only for the distillation of relatively small quantities of material. For larger samples, rotating-brush or rotating-disk evaporators are commonly used. These stills have advantages in that they can conveniently handle larger quantities and that the sample is heated for a shorter length of time and kept mixed during... 

Wet ash filter extract electrodeposit on platinum disk Evaporate wet ask filter extract, electrodeposit on platinum disk Wet ash filter extract el elctrodeposit on platinum disk Dry ash reduce valance State extract electrodeposit on platinum disk Dry ash extract reduce valence state coprecipitate with lanthanum f1uori de... 

Thin-film media can be made by various technologies, eg, sputtered deposited Co—Cr—X films for longitudinal appHcations, laminated media for hard disk apphcation, metal evaporated tape, and multilayers for possible appHcations in magnetooptic recording. 

Fig. 1. Lacquer-coated optical readout laser disk master. Plating by (a) electroless silver spray coating and by (b) vacuum evaporation. Scale bar, cm.

Disk or cascade evaporators are used in the pulp and paper industry to recover heat and entrained chemicals from boiler stack gases and to effect a final concentration of the black liquor before it is... 

In this case, an absorbent material is fixed to a drum or disk. Part of this drum is immersed in the water. When the drum is rotated in the water pan, it absorbs moisture, which is then transferred into the airstream by evaporation. 

A reliable determination of the adsorbent temperature is obviously a crucial requirement of the thermal desorption method. Thermocouples are mostly used to this end. With disks and foils, a thermocouple can be spot-welded onto the back or edge of the sample. Thermocouples can be attached also to ribbons as well as to the wall of the vessel containing an evaporated film. With powdered adsorbents, thermocouples are located in the layer of the sample. The adsorbents in the form of filaments and ribbons are frequently used simultaneously as resistance thermometers, switched... 

Spherical rollers were machined from AISI 52100 steel, hardened to a Rockwell hardness of Rc 60 and manually polished with diamond paste to RMS surface roughness of 5 nm. Two glass disks with a different thickness of the silica spacer layer are used. For thin film colorimetric interferometry, a spacer layer about 190 nm thick is employed whereas FECO interferometry requires a thicker spacer layer, approximately 500 nm. In both cases, the layer was deposited by the reactive electron beam evaporation process and it covers the entire underside of the glass disk with the exception of a narrow radial strip. The refractive index of the spacer layer was determined by reflection spectroscopy and its value for a wavelength of 550 nm is 1.47. 

In contrast, when a THF-acetonitrile solution of [26+jClOj or [113+JC104 was added to the THF solution of K+[2 ], the deep green colour of carbanion [2 ] persisted. After evaporation of the solvent, purification of the residue yielded a dark green salt, [26+2 ] or [113+2 ] (Scheme 3), the IR spectra (KBr disk) of which consisted of the absorptions of [2 ] and [26+] or [113+] superimposed. The visible-near IR region... 

In the most common approach, a water-insoluble metaUoporphyrin is deposited on the surface of a rotating disk electrode (RDE) or on the disk of a rotating ring-disk electrode (RRDE Fig. 18.7a) as a film of poorly defined morphology, either by spontaneous adsorption from a solution of the catalyst in an organic solvent or by evaporation of an aliquot of such a solution onto the electrode. It is impossible to know the... 

To 100 mL of the water sample add 20 mL of 0.2 M acetate buffer (pH 4) to acidify the mixture to pH 4. Filter the solution through a Cig extraction disk with suction and rinse the disk with 50 mL of acetonitrile-water (1 19, v/v). Discard the eluate. Collect the bispyribac in a 500-mL round-bottom flask with 100 mL of acetonitrile. Evaporate the eluate to dryness under reduced pressure. Then the residue is processed as described below. 

After recovering fluthiacet-methyl from the crop extract with n-hexane, acidify the residual aqueous layer and extract the free form of fluthiacet-methyl with n-hexane-ethyl acetate (2 1, v/v). After evaporating the solvent, clean up the residue with an Ci8 Empore Disk Cartridge. After methylation of the free form with trimethylsilyl-diazomethane, clean up the ester with a Bond Elut LRC SI and a Sep-Pak Plus NH2 cartridge, and quantify as fluthiacet-methyl by GC/FTD. 

Filter IL of water sample through a filter paper. Place an Empore extraction disk in a Millipore extraction funnel. Rinse the disk with 10 mL of ethyl acetate, dichloromethane, and acetonitrile, successively. Dry the disk under vacuum and then rinse the disk with 10 mL of methanol and 20 mL of deionized water by vacuum filtration. Pass the prefiltered sample through the disk and elute alanycarb with two portions of 10 mL of acetonitrile. Transfer the eluates through anhydrous sodium sulfate into a 50-mL flask. Remove acetonitrile by rotary evaporation. Dissolve the residue in 1 mL of acetonitrile. 

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