Mortar fraction

Benzoic acid [65-85-0] M 122.1, m 122.6-123.1, pK 4.12. For use as a volumetric standard, analytical reagent grade benzoic acid should be carefully fused to ca 130 (to dry it) in a platinum crucible, and then powdered in an agate mortar. Benzoic acid has been crystd from boiling water (charcoal), aq acetic acid, glacial acetic acid, C6H6, aq EtOH, pet ether (b 60-80 ), and from EtOH soln by adding water. It is readily purified by fractional crystn from its melt and by sublimation in a vacuum at 80. ... 

Tolls et al. [48] performed experiments with fathead minnows to determine the bioconcentration of alcohol ethoxylates in fish. Fish were homogenised in a mortar adding 1 mL of MeOH and 5 g of octadecylsi-lica. The dry dispersed powder was transferred to a syringe barrel and eluted. Four different fractions were obtained, using hexane, ethyl... 

The reaction mixture is cooled and distilled under reduced pressure (Note 4). The fraction boiling at 190-210° at 15 mm. is collected. The distillate solidifies to a pale yellow solid melting at 64° to 69° and weighing 186-200 g. (83-89 per cent of the theoretical amount). It is purified by grinding in a mortar to a powder and washing with 500 cc. of cold 2 per cent sodium bicarbonate solution. The residue is recrystallized from 300 cc. of 95 per cent ethyl alcohol. The recovery is 141-168 g. (63-75 Per cent) of pure white crystals melting at 75-76°. 

The gunpowder explodes in a further fraction of a second, the explosion blowing the shell out of the mortar tube in the manner of a shot from a cannon. At the same time a return section of piped match is lit by the explosion, transferring flame back to the top compartment where it reaches the quickmatch placed across the head of the 25 mm pressed delay fuse. 

The effect of altering the fatty-acid chain length of sodium salts of linear fatty acids on the air entrained in mortars is illustrated in Fig. 3.9 [5], The superiority of the 9-11 carbon chain length fatty-acids is clearly shown and, in practice, fatty-acid fractions with a high Cjq content are chosen the C9 and fatty acids do not occur... 

An intimate mixture of 600 g. of finely powdered freshly fused potassium acid sulfate and 400 g. of powdered tartaric acid, prepared by grinding them together in a mortar, is placed in a 3-I. round-bottom Pyrex flask connected with a condenser which is filled with water but does not have any water flowing through it. The mixture is heated by means of an oil bath maintained at a temperature between 210 and 220° until liquid no longer distils over. Some foaming takes place (Note 1), but if fused potassium acid sulfate is used and the temperature of the bath does not rise above 220°, it is not difficult to control. The distillate is then fractionated under reduced pressure. Pyruvic acid passes over at 75-80 725 mm. and the yield is 117-128 g. (50-55 per cent of the theoretical amount). 

Neutral alumina (1.5 g) was thoroughly mixed with iodobenzene diacetate (532 mg, 1.65 mmol) and benzyl phenyl sulfide Id (300 mg, 1.5 mmol) using a pestle and mortar. The adsorbed material was placed in an alumina bath inside the microwave oven and irradiated at 50% power for two successive intervals of 45 s each (with time interval of 3-4 min bath temperature rose to 80-85 °C). The progress of the reaction was monitored by TLC (hexane-ethyl acetate, 7 3, v/v). When the reaction was complete the whole material was directly charged onto a silica gel column which provided iodobenzene on elusion with hexane (100 mL). The fractions eluted by chloroform-hexane (1 1 v/v) provided sulfone (<7% by... 

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