Azeotropic mixtures may be broken by membrane distillation

Udriot, H.; Araque, Arturo; Stockar, Urs von

doi:10.1016/0923-0467(93)02814-d

Cited by 23 publications

(17 citation statements)

References 10 publications

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“…It has also been successfully applied to the concentration of several non-volatile solutes in aqueous solutions like salt or sugar solutions, fruit juices, blood, and waste water [4]. In recent years, the MD process proposed as a separation technique for ethanol [5,6], the breaking of azeotropic mixtures [7], the concentrating of various acids [8,9], and the separation of isotopic water [10,11].…”

Section: Introductionmentioning

confidence: 99%

Production of drinking water from saline water by direct contact membrane distillation (DCMD)

Hwang

Woo

et al. 2011

Journal of Industrial and Engineering Chemistry

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Section: Introductionmentioning

confidence: 99%

Production of drinking water from saline water by direct contact membrane distillation (DCMD)

Hwang

Woo

et al. 2011

Journal of Industrial and Engineering Chemistry

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“…[6]. In recent years, the MD process has also been proposed as a separation technique for ethanol from aqueous solution [7,8], breaking of azeotropic mixtures [9], concentrating of the various acids [10][11][12], and separation of isotopic water [13].…”

Section: Introductionmentioning

confidence: 99%

Air gap membrane distillation on the different types of membrane

Hwang

Moon

2011

Korean J. Chem. Eng.

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Seawater desalination through the air gap membrane distillation (AGMD) process shows merit for its ambient operational conditions and low energy consumption. In this paper nine types of commercially available membranes were characterized to understand the membranes more comprehensively. The density, porosity, mean pore radius, liquid entry pressure (LEP), and contact angle (CA) of the membranes were determined. AGMD experiments were performed for the membranes to investigate the membrane difference on permeation flux and salt rejection. The effects of operating parameters such as temperature, flow rate, and NaCl concentration were studied. The 0.22 µm pore size PTFE membrane showed excellent performance for its higher permeability and higher hydrophobicity than other membranes. The mass transfer coefficients for three types of PTFE membranes were calculated from the results of the experiments.

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“…The same behaviour was observed by Banat et al . and Udriot et al . for the separation of formic acid/H 2 O and HCl/ H 2 O azeotrope mixtures, respectively.…”

Section: Resultsmentioning

confidence: 71%

“…So far, MD has been investigated for separation of HCl/H 2 O, propionic acid/ H 2 O and formic acid/ H 2 O azeotrope mixtures. Udriot et al . studied the feasibility of breaking azeotropic mixtures using air gap membrane distillation.…”

Section: Introductionmentioning

confidence: 99%

Experimental and mathematical study of air gap membrane distillation for aqueous HCl azeotropic separation

Kalla

Upadhyaya

Singh

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND In the present study, the feasibility of air gap membrane distillation (AGMD) process is investigated for breaking an azeotropic mixture. A test cell AGMD module with hydrophobic PTFE membrane was fabricated and HCl/H2O azeotrope (20.2 wt% HCl) was taken as feed. A mathematical model based on Stefan diffusion multicomponent molecular‐Knudsen mass transfer approach has been developed and validated with experimental data. The effects of different process parameters on total permeate flux, on selectivity and on breaking an HCl/H2O azeotrope mixture also have been studied. The feed side membrane surface temperature and membrane side condensing surface temperature were estimated by CFD modelling. RESULTS The HCl selectivity obtained in the permeate was <1, which indicates that permeate flux is leveraged with water and a higher HCl concentration in the retentate was achieved relative to the permeate. The permeate flux decreased from 36 to 17 kg m−2 h−1 upon increasing the air gap from 3 mm to 11 mm at 50 °C feed temperature. The permeate flux increased from 4 to 28.5 kg m−2 h−1 upon increasing the feed temperature from 30 to 50 °C at 5 mm air gap. CONCLUSION With azeotropic feed, the maximum concentration of HCl achieved in the retentate was 30.8 wt% HCl (i.e. a hyperazeotropic solution) and in permeate was found to be 15.29 wt% HCl (i.e. hypoazeotropic solution). This indicates a strong possibility of using AGMD for azeotropic mixture separation. It also was observed that the permeate flux is affected mainly by feed temperature and air gap width. © 2018 Society of Chemical Industry

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Azeotropic mixtures may be broken by membrane distillation

Cited by 23 publications

References 10 publications

Production of drinking water from saline water by direct contact membrane distillation (DCMD)

Production of drinking water from saline water by direct contact membrane distillation (DCMD)

Air gap membrane distillation on the different types of membrane

Experimental and mathematical study of air gap membrane distillation for aqueous HCl azeotropic separation

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