Volatility of amines used for water treatment in steam generating systems

1978 ◽  
Vol 56 (20) ◽  
pp. 2620-2623 ◽  
Author(s):  
Poyilath Varieth Balakrishnan
Keyword(s):  
Aqueous Solution ◽  
Water Treatment ◽  
Concentration Dependence ◽  
Vapour Pressure ◽  
Temperature Range ◽  
Dilute Aqueous Solution ◽  
Water Azeotrope

The relative volatilities of cyclohexylamine and morpholine in dilute aqueous solution have been measured in the temperature range 150 to 300 °C at the corresponding equilibrium vapour pressure of the solution. Cyclohexylamine strongly prefers the steam phase while morpholine has a relatively volatility close to that of water. In both cases an azeotrope of the amine and water, with a vapour pressure higher than that of either component, must exist; however, with morpholine and water azeotrope formation only occurs above 175 °C. The concentration dependence of the distribution between the steam and solution phases of both amines is explained in terms of their partial ionization in solution.

scholarly journals A thermal method of measuring the vapour pressure of an aqueous solution

1930 ◽  
Vol 127 (804) ◽  
pp. 9-19 ◽  
Keyword(s):  
Aqueous Solution ◽  
Filter Paper ◽  
Vapour Pressure ◽  
Heat Rate ◽  
Cane Sugar ◽  
Thermal Method ◽  
Special Instrument ◽  
Wide Range ◽  
Dilute Aqueous Solution ◽  
The Difference

The method described below of measuring the difference of vapour pressure between any two aqueous solutions, or between a solution and the solvent, arose from experiments on isolated surviving muscles, in which it was noticed that stimulation in nitrogen led to a large increase in the rate of resting heat-production. This increment in heat rate was traced finally to condensation of moisture on the muscle, due to the lowering of vapour pressure caused in the muscle by the accumulation of the products of activity. These experiments are described elsewhere. The unexpected sensitivity of the apparatus to a change of vapour pressure led to its trial with solutions of various concentrations held by strips of filter paper; the results were so promising that a special instrument was designed and constructed, which alone is referred to in the following pages. The method has various advantages: ( a ) it is direct and fairly exact, e. g ., the difference of vapour pressure between water and a not too dilute aqueous solution can be measured at any required temperature, within 1 to 2 per cent. ; ( b ) it is fairly rapid: a reading is obtained in 30 to 45 minutes and four or five measurements can be made at the same time, if desired, by a single observer; ( c ) it has a wide range, e. g ., one can measure, on the one hand, the difference of vapour pressure between 0⋅1 M. NaCl and 0⋅2 M. cane sugar, or, on the other, between 5 M. NaCl (5 g. molecules NaCl to 1000 g. H 2 O) and water, the latter difference being of the order of 500 times the former; ( d ) very small quantities of the solutions are required, enough namely to moisten 1 to 2 sq. cm. of filter paper, say 0⋅2 cc.

High grafting density of cyclodextrin polymer for fast removal of aromatic compounds from water

RSC Advances ◽  
2015 ◽  
Vol 5 (59) ◽  
pp. 47998-48004
Author(s):  
Qian Ma ◽  
Xiaoyan Yuan ◽  
Yunhui Zhao ◽  
Lixia Ren
Keyword(s):  
Aqueous Solution ◽  
Water Treatment ◽  
Organic Compounds ◽  
Aromatic Compounds ◽  
Glycidyl Methacrylate ◽  
Sulfonic Acid ◽  
Cyclodextrin Polymer ◽  
Grafting Density ◽  
Dilute Aqueous Solution ◽  
Fast Removal

The synthesized β-cyclodextrin grafted poly(glycidyl methacrylate) shows great potential in water treatment as it can complex with organic compounds such as 1-naphthylamine and 4′-aminoazobenzene-4-sulfonic acid in dilute aqueous solution.

scholarly journals Freeze concentration of dilute aqueous solution

1968 ◽  
Vol 17 (3) ◽  
pp. 354-355 ◽  
Author(s):  
Atsushi MIZUIKE ◽  
Shigeki KANO
Keyword(s):  
Aqueous Solution ◽  
Freeze Concentration ◽  
Dilute Aqueous Solution

The decomposition mechanism for TDO in aqueous solution within 25–95 °C temperature range

2019 ◽  
Vol 731 ◽  
pp. 136603
Author(s):  
Jianzhong Shao ◽  
Xiaoyun Liu ◽  
Sergei V. Makarov ◽  
Kemei Pei
Keyword(s):  
Aqueous Solution ◽  
Decomposition Mechanism ◽  
Temperature Range
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