Quartz distillation apparatus

Quartz distillation apparatus. Distillation flask of capacity 50-75 ml. The distance between the bulb of the distillation flask and the side-arm should be at least 10 cm. 

Simplified sketch of quartz distillation apparatus for separation of radioiodine from irradiated "° Te02, e02 or °Te02 target. The tube area outside the oven is heated by a stream of hot air (after Qaim et al. 2003)... 

Element Subboiling Quartz Still, Doubly Distilled-Water Feed Doubly Distilled in Quartz, Distilled Water Feed" Deionized, Monobed, Polyethylene Apparatus, Distilled-Water Feed" Distilled Two-Stage Commercial Metal Still, City Water Feed," Recirculating Ultrapure System, Metal" Single-Pass Deionization of Tap Water" Deionization, Carbon Absorption, Deionization, Membrane Filtration ... 

Reagents and water employed to clean all items and to perform the analysis must be extremely pure. Only reagents with a very low heavy metal content can be used (90). Ultrapure water is produced in a quartz sub-distillation apparatus or with special ion-exchange devices (15, 91, 92). The blanks of pure water and reagents must be checked periodically in order to estimate the metal content added to the samples during analysis. 

The Reaction of Carbon Tetrachloride with Octene-1 in Ultraviolet Light. Carbon tetrachloride (182.1 g., 1.18 mole) and octene-1 (39.9 g., 0.36 mole) were mixed in a quartz reflux apparatus. The mixture was held at its boiling point and irradiated with a 500-watt ultraviolet lamp for a period of 4 h. After the unchanged carbon tetrachloride and octene-1 had been removed by distillation, 1,1,1,3-tetrachlorononane (b.p. 72-75°C (0.1 mm.) distilled. A residue (3.9 g.) remained in the distilling flask. 

Silver flask a is charged with 168 g. (1.5 moles) of benzoyl fluoride and chilled with Dry Ice-acetone freezing mixture. Then 5 g. (0.25 mole) of 99.5% DgO is added all at once under Ng. The flask is then attached to the silver distillation apparatus. Brine at —15 C is circulated through the condenser c, and the quartz receiver is cooled with Dry Ice-acetone to —80°C. Cooling of... 

After the fluorination is ended, the GIF is distilled into a steel Cylinder. The arrangement of the distillation apparatus is shown in Fig. 108. The Dewar flask in which the feed vessel is placed is lowered away from the feed vessel as far as necessary to start the product boiling. The small forerun, consisting chiefly of Fg, is removed by a water aspirator. Then the valve of the steel Cylinder is opened and GIF is condensed at a rate such that the pressure in the system is maintained at about 1 atm. The distillation is ended as soon as sizable quantities of condensate (Gig, GIF3) accumulate in the quartz trap. The residue is also drawn off with the water aspirator. Yield 90% maximum, based on chlorine. 

The analytical procedure is as follows a sample containing 0.3 to 3 ag of boron is mixed in a 250 ml quartz distillation flask with amounts of sulphuric acid (A), mercury(II)-chloride solution (B) and hydrogen-peroxide solution (C) as specified in Table IV-1 and dissolved in the position a of the apparatus (Fig. IV-1), whilst warming slightly and occasionally stirring with a magnetic stirrer. 

Pure water for use in the laboratory can be obtained from tap water (hard or soft) by distillation if water of great purity is required, distillation must be carried out in special apparatus, usually made of quartz, not glass or metal precautions must be taken to avoid any spray getting into the distillate. Water which is sufficiently pure for most laboratory purposes can, however, be obtained by passing tap water through cation-exchangers and anion-exchangers as described above, when the water is deionised . 

Purified by vacuum distillation preferably in a quartz apparatus, and stored in quartz or aluminum... 

The ester is first fractionally distilled at 10 mm. in glass apparatus, thus becoming highly enolised (80—90%), and then immediately fractionated in quartz, the first fraction being pure enol. (B., 53, 1410 54, 579.)... 

H. Braconnot showed that an alcoholic soln. of nitric acid is often less active than the aq. soln. He said that the alcoholic soln. acts feebly on bismuth, zinc, and copper because of the low solubility of the nitrates of these metals in alcohol and that it does not attack mercury because of the insolubility of the nitrate in alcohol. P. Pascal discussed the action of mixtures of sulphuric and nitric acids on aluminium, steel, and lead. The addition of sulphuric or nitric acid to a manganic salt or manganese dioxide, in the presence of hydrofluoric, phosphoric, or arsenic acid, may convert the whole of the manganese into the corresponding manganic salt. J. Jannek and J. Meyer found that cone, nitric acid distilled with platinum apparatus contains impurities not found when vessels of fused-quartz are employed. G. P. Baxter and F. L. Grover said that if clean, well-seasoned platinum is used, the results are as good as with quartz provided the acid is free from traces of hydrochloric acid. 

All of the compounds used or prepared in this work are spoiled by water. All transfer of materials was therefore carried out either in the dry atmosphere of a Vacuum Atmospheres Corp., DRILAB, or by distillation under vacuum in well-dried apparatus. All containers or exposed surfaces were of aluminum, Monel, Kel-F, Teflon or quartz. Vacuum lines were constructed of Autoclave Engineering 30VM6071 Monel valves (rated to 30,000 psl) and appropriate lines and connectors. Normal working pressures were measured with Monel Helicoid gauges — one for the 0-1500 torr range, and another for the 0-500 psi range. 

A solution of bicyclo[2.2.2]oct-5-en-2-one (410 mg, 3.36 mmol) in acetone (30 mL) was placed in three quartz tubes, degassed by bubbling Nj through the solution for 15 min, and irradiated with RPR 253.7 nm lamps in the merry-go-round apparatus. After 4 h, one tube was analyzed by GC (6ft UCW 98 column at 100 C) to show that the reaction was 70% complete. The remaining two tubes were photolyzed for an additional 3 h. The solvent was evaporated on a rotary evaporator under vacuum and the crude oil (240 mg) was distilled with a micro still to give the product as a clear, colorless oil yield 92.2 mg (34%). 

M. Kolthoff and T. Ka.meda have developed a simple technique for measuring the pH of pure water and of neutral salt solutions. Conductivity water was distilled in a quartz apparatus, first over dilute sulfuric acid to remove volatile bases and... 

The silicon traces present in the reagents and water used interfere in the determination of microgram amounts of silicon. Analytical grade HCl, H2SO4, and HF, and distilled water contain 2-10" %, 7-10 %, 4-10 %, and 2-10 % of Si, respectively [10]. These reagents may be considerably purified by distillation in quartz or platinum apparatus. Platinum, Teflon, and polyethylene vessels should be used and the silicon in a reagent-blank solution should be taken into account when traces of silicon are determined. The interfering effect of various substances on the determination of Si as silicomolybdenum blue was studied after decomposition of the samples with HF [32]. 

Ammonia solution. Saturate water, distilled twice in quartz apparatus, with ammonia gas from a cylinder. Use a polyethylene bottle and cool the water in an ice-water bath. 

Antimony (V) pentafluoride [7783-70-2] M 216.7, m 7.0", 8.3", b 141", 150", 148-150", d 2.99, pK 2.55 [for HSbfOH) = SbfOH) + H" "]. Pmify it by vacuum distillation, preferably in a quartz apparatus, and store it in quartz or aluminum bottles. It is a hygroscopic viscous liquid which reacts violently with H2O and is hydrolysed by alkalis. It is POISONOUS and attacks the skin. [Woolf Greenwood / Chem Soc 2200 1950, Kwasnik in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I p 200 7965.]... 

A glass cartridge is filled at the tapered end with a small amount of quartz wool, followed by about 50 mg powdered drug and about 50 mg starch. The cartridge is sealed with a damp and placed in the oven block of the TAS apparatus, which is heated to about 220 C. The open end of the cartridge points directly to the TLC plate. Volatile compounds at the given temperature then distil onto the starting zone of the TI,C plate in about 1.5 min. Immediately afterwards, the plate can be placed in a solvent system sufficient for TLC separation,... 

The method for obtaining large quantities of water with pH = 7.00 is based on addition of NaOH and KMnO dxiring the first distillation and HgPO (to combine the NH3) in the second distillation step. A third distillation in quartz apparatus (to remove traces of alkali) follows. 

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