Humidity Control by Means of Sulfuric Acid Solutions, with Critical Compilation of Vapor Pressure Data.

Abstract

tie oil comes with it, it is removed by filtering through dry filter paper. An aliquot part, depending on the salt content, is then concentrated for titration with a solution of approximately 0.05 N silver nitrate, using potassium chromate as an indicator.From these results the chlorine can be calculated, or, if previous analysis of similar brine has shown it to consist mostly of sodium chloride, it may be calculated as such.We have tested the accuracy of the method by making a re-treatment of some of the oil which had settled out after the treatment outlined above. A mere trace of chlorides could be found, thus furnishing good proof that the first treatment had effected their almost com-

Respiration of Cereal Grains and Flaxseed

“…This C02-free air was then passed through a series of bottles containing sulphuric acid of the proper specific gravity to bring the escaping air to a relative humidity in equilibrium with the hygroscopic moisture content of the grain to be aspirated in order to avoid moisture changes in the CONTANT grain during the aspiration process. The data for adjusting atmospheres to the appropriate relative humidity were taken from the papers by COLE-MAN and FELLOWS (9), and WISON (22).…”

A laboratory system to estimate ammonia volatilization

“…The solution that we tested -bubbling air through acid solution with different concentrations -is much simpler from a technical point of view. Moreover, it generated a fairly constant humidity and is well reproducible [20]. However, it must be calibrated, as equilibrium is not reached between the air and the solution.…”

“…Table II presents different sulfuric acid concentrations and resulting air humidities obtained after bubbling. The acid concentration of the scrubber should be chosen according to the temperature and air humidity objectives [20]. To measure the outgoing air concentration in ammonia, the scrubber was designed to obtain an efficient trapping of NH 3 by the acid solution (H 2 SO 4 , 0.072N).…”

Addition of Amines to Crotonic Acid Esters of Cellulose. Preparation and Properties of Cellulose Propionate 3-Morpholinobutyrate (CPMB)

“…MOISTURE REGAIN. The per cent moisture sorption of CPMB was determined by equilibrating samples of the ester over aqueous sulfuric acid of the concentrations required to obtain the desired relative humidities (Wilson, 1921). The values (Table V) are not greatly different from those obtained on a sample of a commercial cellulose acetate of 43% acetyl content.…”