Tube oven

Regulations 1964 Economisers, Superheaters, Steam Tube Ovens and Steam Tube Hotplates... 

STEAM TUBE OVENS, AND STEAM TUBE HOTPLATESt... 

This polymer is postcondensed in the solid state. For this, 5 g of material is placed in a glass flask which has been flushed with a stream of nitrogen. The flask is placed in a tube oven at 290° C and kept at that temperature for 1 h. The resultant polymer now has an r]i h of 1.52. The polymer is highly crystalline and has a melting temperature of 475° C. 

Char Preparatioa Chars were prepared both by isothermal pyrolysis of 5 g samples of resin in a quartz boat heated in an atmosphere of flowing (0.5 SCFM) N2 in a quartz tube oven (N2 pyrolysis chars) and by open combustion of 1 g samples of resin exposed to 2.8 watts/cm2 of radiant energy from an electric heating panel (4-5) (combustion or burn chars). All chars were finely ground with a glass mortar and pestle prior to analysis. 

Benzobisthiazole random copolymers (X) [38] were also prepared using 2-methyl terephthalic acid and terephthalic acid with l,4-dimercapto-2,5-diamino-1,4-benzene dihydrochloride. Various copolymers provided materials with a wide range of crosslink densities. High quality fibers with spin draw ratios as high as 50 to 1 were obtained by dry-jet wet spinning of anisotropic polymerization mixtures. Heat treatment of the fibers was carried out in a tube oven... 

Fifteen grams of green chromic oxide (No. 7) are placed in the center of a combustion tube and the latter is placed in a tube oven with temperature control. The exit end of the tube should have an opening of at least 10mm to allow for escape of sublimed hexachloroethane, which is formed as a by-product. [CAUTION The experiment must be conducted in hood because vapors of phosgene are poisonous.)... 

Fig. 5. Graphite tube oven with standard and modified boat.

As shown in the chart, one option for handling samples whose matrix interferes with the titration is to use a vaporizer oven. These units can be used with either coulometric or volumetric units. The sample is placed in a tube oven, and the oven is heated to a set temperature. A stream of dry nitrogen, dry air, or dry argon carries the moisture released from the sample to the titration vessel. This approach can also be used with samples that undergo interfering side reactions. When ovens are used, it is important to check recoveries and to ensure that the sample does not undergo any thermal degradation that could either produce water or contaminate the system. 

Delayed coking is the only main process in a modern petroleum refinery that is a batch-continuous process. The flow through the tube oven is continuous. The feed stream is switched between two drums. One drum is filling with coke while the other drum is being steam-stripped, cooled, decoked and warmed up (see chapter 6). The overhead vapors from the coke drums flow to a rectification unit. The rectification tower has a reservoir in the bottom where the fresh feed is combined with condensed product vapors (recycle) to make up the feed to the coker heater. 

Obtained a nieta silicate BeSiOj with a density 2.35 and an orthosilicate with density 2.46 by fusing the oxide with SiOa in a carbon tube oven electrically heated to above 2000°. Melting point of each about 2000. ... 

Preheat tube oven to 350 °C (to decompose traces of Ni(CO)4 produced in the vessels Brenninkmeijer Mook, 1981) at least one hour in advance to permit thermal stabilization. Note that the Ni-trap should be cleaned in 10% nitric acid routinely to prevent excess build-up of Ni and carbon. 

Uses Binder, conosion inhibitor for water-based high temp, anticorrosion paints, e.g., coatings for industrial equip., chimneys, exhaust tubes, ovens, barbecues... 

Procedure for Preparative Collection. The collection tube (oven dried until 5 min before use) is attached to the heated exit port by the metal 5/5 i joint. Sample collection is begun 30 s before detection of the expected peak on the recorder (based on previously determined retention values refer to your local laboratory instructions) and continued until 30 s after the recorder s return to baseline. After the collection tube is detached, the sample can be analyzed directly when collected into a GC NMR collection tube or transferred to the 0.1-mL conical GC collection vial. After the collection tube is joined to the vial (preweighed with cap) by the 5/5 T joints, the system is centrifuged to force the sample down into the vial (Fig. 5.3). The collection tube is then removed, and the vial is capped and reweighed. 

Figure 6 Apparatus for determination of vapour pressure by dynamic method, A, Monel boiler provided with central thermometer pocket B, aluminium tube-oven C, coupling linking metal connecting tube to glass D, mercury-filled manometer connected to oil-filled line leading to piston gauge E, glass valve with PTFE stem Fisher and Porter Company, U.S.A.) F, reservoir for introduction of the sample G,H, electrical heater windings K,L, control resistor windings, insulated by suitable wrappings from G and H M, platinum resistance thermometer N, connection to vacuum system...

An additional source of error in oven aging is the exchange of volatile components between individual test specimens and the resulting distortion of aging resistance values. This can be prevented by using tube ovens, where the specimens are... 

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