Showing papers on "Vapours published in 1968"

Method for separating acrylonitrile and acetonitrile by extractive distillation with coolant vapor generation

Abstract: ACRYLONITRILE AND ACETONITRILE ARE SEPARATED INDIVIDUALLY FROM AN AQUEOUS SOLUTION CONTAINING ACRYLONITRILE AND ACETONITRILE USING A COMBINATION OF AN EXTRACTIVE DISTILLATION COLUMN FOR RECOVERY OF ACRYLONITRILE USING WATER AS AN EXTRACTING AGENT AND A STRIPPING COLUMN FOR RECOVERY OF ACETONITRILE. THE DISTILLATION OF SAID STRIPPING COLUMN IS CONDUCTED UNDER PRESSURE, SO THAT, AT LEAST ONE PORTION OF OVERHEAD VAPOURS EVOLVED FROM THE TOP OF SAID STRIPPING COLUMN MAY BE CONDENSED IN A CONDENSER AT A TEMPERATURE HIGH ENOUGH TO ALLOW THE CONDENSATION OF SAID VAPOURS TO BOIL THE COOLING LIQUID IN THE CONDENSER. AT LEAST ONE PORTION OF SAID COOLING LIQUID IS THEREBY RECOVERED AS VAPOURS. FURTHER, VAPOURS ARE RECOVERED BY SUBJECTING A LIQUID WITHDRAWN FROM SAID STRIPPING COLUMN TO PRESSURE REDUCTION TO AT MOST APPROXIMATELY ATMOSPHERIC PRESSURE TO GENERATE VAPOURS FROM THE WITHDRAWN LIQUID. 70 TO 90% OF STEAM CONSUMED IN THE STRIPPING COLUMN WHEN OPERATED UNDER ATMOSPHERIC PRESSURE CAN BE THEREBY RECOVERED.

Intermolecular potentials and viscosities of some polar organic vapours

Abstract: The viscosities of chloroform, acetone, methyl and ethyl alcohols have been measured over the temperature range 30-200°C by using an oscillating-disk viscometer. The data have been used to obtain information concerning the intermolecular potentials of these polar organic vapours.

Purification of vapours containing fluorine compounds

Abstract: 1,179,366. Purifying vaporized fluorine-containing compounds. L. A. MITCHELL Ltd. 26 March, 1968 [3 May, 1967], No. 20419/67. Heading B1L. Impurities in vapour streams which camprise fluorine compounds and water vapour are removed by scrubbing the vapour stream with an aqueous liquid which does not absorb the fluorine compounds but which does absorb the impurities, at such a temperature as does not cause substantial condensation of the water vapour present. Thus vapours from tank I containing HF, SiF 4 and water vapour as well as phosphoric acid as impurity pass to scrubber 5 where they are .scrubbed with aqueous fluosilicic acid of 30-70% concentration by weight, which absorbs the entrained phosphoric acid but does not absorb the HF or SiF 4 . Scrubbing conditions, e.g. pressures of 5-29 ins. Hg and temperatures of 25-95‹C are such that no condensation of water vapour occurs. Liquid effluent leaves by line 6 and is returned for further scrubbing by line 9. The purified vapour stream passes by line 13 to scrubber 14 where it is scrubbed with fluosilicic acid of less than 30% concentration. The HF and SiF 4 are absorbed therein and are subsequently recovered by conventional methods from the liquid effluent which passes by line 15 to vessel 16. The vapours passing on to scrubber 23 are condensed with water and passed to waste by line 24.

The effect of molecular association on the electrical conductivity of sodium vapour

Abstract: The electrical conductivity of sodium vapour at pressures above 10 torr cannot be calculated satisfactorily on the assumption that the vapour is monatomic. A theoretical assessment shows that clusters of three and four sodium atoms, which have exceptionally low ionization potentials, may make contributions to the conductivity out of all proportion to their concentrations, to the extent that under nearsaturated conditions their influence could predominate by an order of magnitude. The conclusions of this paper apply to all alkali metal vapours, and possibly to other metallic vapours also.

Time-of-flight determination of the diffusion coefficient of Cs2+ ions in caesium vapours

Abstract: Measurements have been made of the diffusion coefficient of Cs2+ ions in caesium vapours using a time-of-flight technique with a pulsed ion source and hot-wire detector. This allowed a direct evaluation of the normalized zero electric field mobility of μ0similar, equals028 cm2 V−1 S−1 over the approximate temperature range 500-590°K.

Inhaled Particles and Vapours. II.

Abstract: various fields of radiology in the wide experiences of the United States Army in World War II. The foreword notes the neglect in the documentation of information obtained in World War I and the failure in anticipation of the problems encountered in World War II. This contribution stresses the value of the recording of available facts in the organization for any further major conflict. The records are divided into those obtained from the various 'Theaters of War' and considerable clinical material is included but this is so scattered and poorly presented as to be of little value. An interesting feature is the description of the enormous routine radiological chest surveys organized for recruits and the various techniques that were used. In I944 a chest radiograph was a prerequisite in Physical Examination for Mobilization. Difficulties were naturally encountered in assessment of rejection standards with regard to calcified tuberculous pulmonary lesions. It was agreed that large lesions might break down under war-time circumstances and the criteria recommending that men could be accepted were as follows:

Heat transfer in polar organic vapours

Abstract: The thermal conductivity of several polar organic vapours has been measured over the temperature range of 38 °C to 200 °C by the thick-wire variant of the hot-wire method. An attempt has been made to interpret the observed data with the help of a theory recently developed by Mason and Monchick.