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New clayalumina porous capillary support for gas and water filtration applicationsIndian Science Congress, 3rd- 7thJanuary 2013

Sandeep Sarkar a, Sibdas Bandyopadhyayaa, Andre Larbot b, Sophie Cerneaux b,[a] Central Glass and Ceramic Research Institute, 196, Raja S. C. Mullick Road, Kolkata 700032, India

[b] Institut Europen des Membranes, UMR 5635 CNRS ENSCM UMII, Halle de Technologie, 276 rue de la Galra, 34000 Montpellier, France

*Email:sandeep@cgcri.res.in,sandeepsarkar123@gmail.com,ph:09432849210

Physical characteristics of sintered clay-alumina capillaries with different compositions

b c

The addition of clay to alumina reduces the raw materials cost since aluminais 7 timesmore expensive than clay and second the excess silica present in

the clay reduces the sintering temperature to 1450oC,

which also decreases the consumption of energy for the process. The pore size and porosity of the capillary support can be modified as per

requirement by changing the clay-alumina compositionConsidering the pore characteristics, flexural strength, chemical stability and

pure water flux, capillary tube C55 can be considered as the more suitable

for micro filtration application (pore size of 1.3 micron, porosity of 44%and

permeability of 540 L/m2 h bar). Same formulation may be used for different

tube configuration viz. Multichannel, monochannel tube etc. I. Voigt, G. Fischer, P. Puhlfur, M. Schleifenheimer, M. Stahn, TiO2NFmembranes on capillary supports,Separation and Purification Technology 32 (2003) 8791

S. Masmoudi, A. Larbot, H. El Feki, R. Ben Amar, Elaboration and characterisation of apatite based mineral

supports for microfiltration and ultrafiltration membranes, Ceramics International 33 (2007) 337344M.C. Almandoza, J. Marchese, P. Pradanos, L. Palacio, A. Hernandez, Preparation and characterization

of non-supported microfiltration membranes from aluminosilicates, Journal of Membrane Science 241 (2004)

95103.

Y.C. Dong, X.Y. Feng, D.H. Dong, Elaboration and chemical corrosion resistance of tubular macro-porouscordierite ceramic membrane supports, Journal of Membrane Science 304 (2007) 6575.

0

10

20

30

40

50

60

70

0 10 30 40 55 70 100

Clay content (wt.%)

Poro

sity(%)

0

0.5

1

1.5

2

2.5

3

Pore

size(m)

Porosity

Pore size

New porous capillary tubes based on a clayalumina mixture was prepared at a temperature lower than 1500oC without losingtheir mechanical property and porous characteristics for the preparation ultra and nanofiltration membrane for gas and liquid

filtration application. The presence of clay in the formulation is aimed to produce low cost but still mechanically strong porouscapillary tubes after sintering at a relatively low temperature as compared to the sintering temperature of pure alumina support

tube (1700oC) [1].

SampleID

Claycontent

(wt.%)

Aluminacontent

(wt.%)

Porosity(%)

Pore Size(!m)

Tensile Strength (MPa)fired at

1200C 1300C 1450C

A 0 100 61 2.80 - - -

B 10 90 60 2.51 - - -

C 20 80 - - - - -

D 25 75 - -- - - -

E 30 70 57 1.47 - 12.71 16.84

F 40 60 51 1.46 13.5 18.69 27.43

G 55 45 42 1.40 24.45 36.01 39.83

H 70 30 39 1.10 27.68 63.21 64.36

I 85 15 - - 27.87 64.4 64.76

J 100 0 18 0.33 35.18 - 70.66

(A) SEM image and (B) picture of a 200 mm-long clayalumina capillary tube sintered at 1450oC with

dimensions of 3.1/1.9 mm (OD/ID).

Pore size and porosity of the support can be engineeredby changing the clay alumina composition (results by Hg

Intrusion method)

Mechanical resistance

XRD patterns of clayalumina capillary tubes B40, C55, D70 and E85 fired at 1450oC.

Evolution of water flux for capillaries B40, C55 and D70 fired at1300oC and 1450oC.

Results

Work published: Sandeep Sarkar, Sibdas Bandyopadhyay, Andre Larbot,Sophie Cerneauxb, New clayalumina porous capillary supports for filtration

application, Journal of Membrane Science 392 393 (2012) 130 136,

2011.12.010

Patent filled in India: No. 2284DEL2011, 1stfilling date 12/08/2011Funded by CEFIPRA-IFCPAR, Joint collaboration IEM b, Montpellierand CSIR-CGCRI a, Kolkata. Project No 3308-2, 2008-11

Clay-alumina capillarybundle of 300mm length