Ascarite

Neon [7440-01-9] M 20,2, Passed through a copper coil packed with 60/80 mesh 13X molecular sieves which is cooled in liquid N2, or through a column of Ascarite (NaOH-coated silica adsorbent). 

An efficient biocatalytic method for the production of amides in multigrara scale has been developed for the synthesis of a pyrrole-amide, which is an intermediate for the synthesis of the dipeptidyl peptidase IV that regulates plasma levels of the insulinotropic proglucagon. CALB catalyzes the ammonolysis of the ester with ammonium carbamate as source of ammonia (Scheme 7.8) [22]. The use of ascarite and calcium chloride as adsorbents for carbon dioxide and ethanol by-products. 

Gases were supplied to the infrared cell from a gas manifold. 4.99% NO in He and 2.14% CH4 in He were obtained from Matheson. Oxygen and helium were obtained on-site. The He, NO, and CH4 cylinders were passed through an oxysorb trap, an ascarite trap, and a molecular sieve trap, in that order, for additional purification. The O2 was passed through an ascarite and a molecular sieve trap. 

In flame calorimetry, it is not easy to measure directly with good accuracy the mass of reactants consumed in the combustion. Therefore, the results are always based on the quantitative analysis of the products and the stoichiometry of the combustion process. In the case of reaction 7.73, the H20 produced was determined from the increase in mass of absorption tubes such as M, containing anhydrous magnesium perchlorate and phosphorus pentoxide [54,99], When organic compounds are studied by flame combustion calorimetry, the mass of C02 formed is also determined. As in bomb calorimetry, this is done by using absorption tubes containing Ascarite [54,90]. 

The station designed to dispense and mix the 4— 10 mesh ascarite 11 with rock salt uses a single shuttle, but the shuttle has two separate chambers in it. The shuttle is positioned under a divided reagent storage bin where one half contains 4—10 mesh ascarite II and the other half contains rock salt. When the shuttle is moved back to the fill position, the correct proportions of ascarite II and rock salt are loaded into the shuttle based on the size of the chamber allocated for each. When the shuttle is moved forward to the load position... 

Passage of CO through Ascarite was not necessary for the checkers to obtain the yields reported. 

The submitters used prepurified nitrogen, obtained from Matheson Company, Inc., East Rutherford, New Jersey, without further purification. The checkers passed Linde (H. P. Dry) nitrogen successively through chromous chloride solution, solid potassium hydroxide, Ascarite, and solid phosphorus pentoxide. 

Carbon dioxide was determined gravimetrically with Ascarite. 

Ascarite. See under Asbestos ASG. A cast double-base propellant described in conf Propellant Manual, SP1A/M2(1959), Unit No 449... 

CO - C02 (by acidification) co2 (The liberated C02 is trapped with Ascarite and weighed.)... 

Ascarite , a proprietary absorbent made from NaOH 81 asbestos and used for the absorption of carbon dioxide... 

Nitrogen (Matheson, pre-purified) was used as a covering gas for all liquids. It was further purified by passing it over copper turnings in a tube furnace, an Ascarite column, a dry ice trap, and finally through a silica gel column at liquid nitrogen temperature in which some condensation occurred. This nitrogen was then stored in two-liter bulbs on the vacuum line. 

After the experiment, the used catalyst was purged with steam and then regenerated with a mixture of steam and air the regeneration gas was dried and any carbon dioxide formed was absorbed by Ascarite for determination of the percent carbon deposit. 

Now, let s imagine the gas is delivered to a patient through a gas scrubber filled with Ascarite to remove the carbon dioxide. Ascarite is sodium hydroxide on asbestos. Ascarite II uses silica instead of asbestos. As the gas flows over this high-surface-area medium, carbon dioxide in the sample reacts with the sodium hydroxide to give the nonvolatile product sodium bicarbonate. 

McAucliffe [25] found various impurity peaks in the direct injection of aqueous solutions of hydrocarbons, which limited sensitivity to about lm L 1 of individual hydrocarbons. He employed a 3.66rnx6rnrn column containing 25% SE-30 on firebrick and a precolumn containing ascarite to absorb the water and improve the sensitivity. Other workers have used similar precolumns to remove water. 

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