Polymeric membranes

Polymeric membranes

Research Trends charge Research Idraulico e Strutturale, Italy, simulation reveals that qualitative behaviour example, if the distributed...

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Research Trends

charge

Research

Idraulico

e Strutturale,

Italy,

simulation

reveals

that

qualitative

behaviour

example,

if the

distributed,

efficiency

is independent

density,

of a membrane

technology,

its

(RO), has

appropriately.

been

of system

for

made

the

brought

have

schemes

(submerged,

and

ground-based)

underground fresh

sea

which

water

water.

production

The

I J.-P

osmosis

deep sea

system”,

ROD%),

which

has been

in

collaboration

(Firenze),

WIP

JRC the RODSS

desalinating

units

a suitable

operative

achieves

a

Hsu,

(1 June

energy

the

chloride)

energy

fresh-water The

which

promising

economical

regard

to

with

potential energy

176 (7 July 1999).

respect like

Spherical ion-exchange membranes studied current

sphertcal is

efficiency

ion-selective

examined

perturbation

theoretically. method

is adopted

solve the Nernst-Planck governing

the spatial

the concentration

a

of ions

membrane

phase

distribution

A

and nature

for

J of

in the

158(1-2)

the

case

of

fixed

hydrolysis

during

crown-6

membranes for

coating,

and

supports

are

PA. Jacobs:

The by

ion

liquid

92.2+1.4%.

and

efficiency

is sol

masking

at pH

of

(TEOS).

was diminished G.

120

min

The

selectivity

of

palladium

and recovery

solution

Zn2+, and the 4.7,

Khayatian,

acids the

of the BSA

process. J. Randon,

Separation

J.L. Rocca: Purij%ation

&

Technology

16(3)

243-250

(9

1999).

hnology month News news

Features Developments

and applications

around the world

Pb”,

Cd2*,

Cr3+

Latest membrane

research

World, US and European membrane

patents

were

presence

of

as a suitable

effect of H$+

Research Trends

Patents

solutions

agent in the source

the interfering

acid-catalysed

of the

aqueous

In

amino

to improve

the

across

after

Fe3+

investigated. EDTA

in

amount

Tl+, Ca2+, Mn2+, Co2+,

Cu2+,

Hg2+,

hydrophobic

the

from

containing

to the

can be optimised

thiocyanate

transported

was

a

liquid

acceptor

membrane

Ni2+,

through

bulk

palladium

by drying

condensation

as

phase,

in a silica

(MTES)

tetra-ethyl-ortho-silicate

the

transport

membranes

by

for

ion

methyl-tri-

the enantiomeric these

as a

of palladium

By using

alkanes

used

carrier

as a metal

adding

of

New product releases

transport complex

and L-

Industry trends

efficient

receiving

competitive

Contracts

was

membrane.

N,,

of supported

The the

a

on a single site. Based

of

J

158(1-2)

1999).

small

prepared

was

of D-enantiomers

Ned

of palladium

>a

most

complexation

and

B. Moermans,

complex

in the

1. The

coating

analysis

chloroform

i-C4H,,.

7-l

spectroscopic

show

as Hz, CO,,

and larger

and

the

(1 June

of

kynurenine

to BSA protein

August

the

of additives

Ammonium-dibenzyldiaza-18-

PdCP4

followed

by

the

to simulate

Commercial

are

membranes

of

the

Science

289-297

silica membranes

dip-coating

ethoxy-silane prepared

of

Membrane

“uphill

calcining.

as the

support,

the presence of

is

a

mechanism

of

range

F. Garnier,

layers such

the

I.F.J. Vankelecom,

of

are

obtained of

solution,

properties

and

yalumina

to

support

G. Verschueren,

and

such

C,H,

and (PVDF)

as models

pH

selectivity

with

(BSA)

enantiomers

separation in

oxide)

polyvinylidenefluoride

of

tested

bovine

Three

and

mechanism

layers

using

agent.

complexation

1999).

filled

Parameters

in

on these results,

(polysulfone

zirconium

can

by ultrafiltration

albumin been

racemic

its analogues

system

complexing

probable

pervaporation.

poly(buty1

a solution

enantiomers

top

thermal

the poly(viny1

permeance

sol solution,

equation variation

where

the

of

membrane

Zirfon

highly

membranes repeated

(PDMS)

techniques,

by

silica for gas

to SF,

H.

polydimethyl-

using

M.

122(2-3)

of

investigated

The

be performed

binding

intrusion

and

Science

(1 June

range.

I 0, and CH,, and permselectivities 171- ’ of 20-50 for these gases with

M. de Gerloni,

Reali: Desalination

The

gas

Maier,

1999).

These

molecules,

D. Colombo,

277-288

pre-wetting

K. Tsubouchi:

synthesis

high

158(1-2)

W.F.

of

separation

tryptophan

sieving

of Membrane

Transport

described.

sources.

J.

in the support

benzene/

Science

hydrophobic

advantageous

renewable

; The

Vos,

concentration

separation

seems to have a

de

porosity

membrane.

(1 June

are

effects. R.M.

The

have

in which

molecular

Separation by ultrafiltration

serum

on

molecules

in the whole

of onto

Hydrophobic

desalination

submarine technology

introduction

methacrylate)

I membrane

proposed

the

by

studied.

of

rate was enhanced

; 269-276 :

the main

a

composition

Membrane

maintenance

and of

the

air purification

asymmetric

material

separation

mixture

permeation

and

perspectives

impurity

siloxane

butyl

membrane

M. Yoshikawa,

capacity.

clarifies

operative features

coupling

any

of comparable

production

discussion

with

than

(ground-based)

feed

dedicated

The

of

from

benzene

free

the

N,

Intrusion of polydimethylsiloxane

1999).

selective

less

plant

of

membranes

permselective

: for

and

cyclohexane

desalination

1.

for

(9

1999).

tryptophan

i58(i-2)

chloride)-graft-

; exploitation of the hydrostatic : pressure of sea water. RODSS is : described in sufficient detail to : demonstrate that it requires much j electrical

Jiang:

Science

polymerisation

at

depth

through

conventional

J.-M.

the

sited offshore

remarkable

efficiency

also

for process

the very high

offer

blocked

&and

makes

suitable

obtained

August

Purification 235-241

times

the latest

of 4 and 7 x lo-’ moUrn’sPa,

larger

exppssion

ten

humid

In addition,

permeance

0.7 nm.

which

in

respectively,

by

is

streams. 0,

parameters

Poly(viny1

and

under

of

Commission.

more

applications

: methacrylate onto poly(viny1 European : chloride) and poly(viny1 chloride), has its RO ’ was found to be an effective

(Munchen),

auspices

them

is

: poly(buty1 methacrylate), which ; was prepared by radical graft

with

(Ispra),

membranes,

of a

cylindrical

Polymeric

RO

(“reverse

ETA

silica

Verweij:

I 257-267 :

scheme designed

For

current

membranes

Membrane

report

submarine

than

discussed.

from

present

the

concerns

planar,

spherical

out three novel and highly

efficient for

object

analyses

of about are

efficiency

A general

a pore diameter hydrophobic

can be raised

choosing

16(3)

membranes

of both

and the applied

&

Technology

more

charge

(or curvature)

Separation

The

the current

and the current

based on reverse osmosis design

fixed

layer

of 60 nm and

silica membrane

of

to that

uniformly

membrane Polo

the

membranes.

The double

has a total thickness

of spherical

is similar

the inner radius

Milano,

desalination

numerical

cylindrical

Division,

of radial

The

membranes

Energy-efficient, submerged desalination plant At Enel

is a linear function

position.

phase, ions

NetScope The best membrane

sites

reviewed

drastically. M.

Shamsipur:

Membrane Technology No. 116