Composite Chitosan Membranes for the Separation of Methanol/methyl tert-butyl Ether Mixtures

2014 ◽  
Vol 67 (2) ◽  
Author(s):  
Mohd Ghazali Mohd Nawawi ◽  
Zafifah Zamrud
Keyword(s):  
Surface Morphology ◽  
Composite Membranes ◽  
Operating Conditions ◽  
Methanol Concentration ◽  
Methyl Tert Butyl Ether ◽  
Optimum Operating ◽  
Butyl Ether ◽  
Tert Butyl ◽  
Separation Factors ◽  
Swelling Characteristics

Composite membranes from chitosan blended with different ratios of chitosan were developed for the pervaporation of methanol/methyl tert-butyl ether mixtures. The composite membranes were characterized for surface morphology and sorption. Surface morphology showed chitosan and PVA were homogenously blend for all chitosan composition. Swelling characteristics of composites membrane were affected by methanol concentration as well as chitosan composition in the blend. Increasing feed temperatures and methanol concentration in the feed in pervaporation increased the flux and decreased the separation factor. The composite membranes containing 20 to 40 wt% chitosan was chosen as the preferred membrane formulation to yield fluxes ranging from 50 to 70 g/m2hr with separation factors ranging from 55 to 80 at optimum operating conditions of 30 wt% methanol in the feed and feed temperature of 50 0C.

Polyion Complex Chitosan Membrane Consisting of Sodium Alginate/Chitosan for the Pervaporation Separation of Methanol/Methyl tert-butyl Ether Mixtures

2013 ◽  
Vol 66 (1) ◽  
Author(s):  
M. G. Mohd Nawawi ◽  
Zafifah Zamrud
Keyword(s):  
Sodium Alginate ◽  
Composite Membranes ◽  
Methyl Tert Butyl Ether ◽  
Separation Performance ◽  
Butyl Ether ◽  
Polyion Complex ◽  
Tert Butyl ◽  
Swelling Characteristics ◽  
Separation Performances ◽  
Feed Temperature

The polyion complex (PIC) composite membranes consisting of chitosan (CS) and sodium alginate (SA) were prepared for the separation of methanol/methyl tert-butyl ether (MTBE) mixtures via pervaporation process. Membrane morphologies showed that CS and SA were homogenously intermixed for all blended ratio tested. Swelling characteristics observed all membranes were readily swelled in the solution mixtures containing more methanols. Separation performance of the membranes via pervaporation was performed on the effect of SA composition in the membrane blend, effect of MTBE concentration in the feed and effect of feed temperature. Overall separation performances showed that the membranes were highly permselective towards methanol due to the affinity and polarity for all the studied parameters. 

scholarly journals Methyl-Tert-Butyl-Ether Synthesis Reactor Modelling and Optimization Using an Aspen Custom Modeler

2017 ◽  
Vol 45 (2) ◽  
pp. 1-7
Author(s):  
Zeeshan Nawaz
Keyword(s):  
Heat Transfer ◽  
Homogeneous Model ◽  
Operating Conditions ◽  
Effectiveness Factor ◽  
Packed Bed Reactor ◽  
Methyl Tert Butyl Ether ◽  
Optimum Operating ◽  
Process Data ◽  
Butyl Ether ◽  
Aspen Custom Modeler

Abstract A pseudo-homogeneous model of methyl-tert-butyl-ether (MTBE) synthesis in a multi-tubular packed-bed reactor has been developed using an Aspen Custom Modeler (ACM) for selecting optimum operating strategies, for the maximization and enhancement of MTBE production, and isobutylene consumption, respectively. The model accounts for mass, energy and momentum balances; and the effectiveness factor is evaluated in a onedimensional pseudo-homogeneous model. The kinetic investigation contains kinetic rate expressions as given by the effectiveness factor for accounting the resistance of pellets in terms of mass and heat transfer. An activity coefficient can be used in order to systematically obtain a new steady-state solution. The model used literature-based correlations for the estimation of heat transfer coefficients. The value of the coefficient for gascoolant heat transfer can be adjusted by using a tuning coefficient in order to enrich the process data. Reasonable agreement was found between model predictions and data under similar conditions. The studies concerning model sensitivity compute the optimum temperature, pressure, feed flow rate, methanol/isobutylene ratio, heat removal rate, etc. of the reactor and suggest optimum operating conditions of the reactor.

Direct dissolution of gallstones with methyl tert-butyl ether (MTBE) via endoscopic transpapillary catheterization in the gallbladder (ETCG)

1994 ◽  
Vol 29 (4) ◽  
pp. 486-494 ◽  
Author(s):  
Naohito Uchida ◽  
Toshiaki Nakatsu ◽  
Shuko Hirabayashi ◽  
Atsushi Minami ◽  
Hiroki Fukuma ◽  
...  
Keyword(s):  
Methyl Tert Butyl Ether ◽  
Butyl Ether ◽  
Tert Butyl ◽  
Direct Dissolution ◽  
Dissolution Of Gallstones
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