Supported zeolite membranes on a growth-enhancing layer

from

about

0.001

pm

to about

20

pm.

In

anisotropic

hollow

fibres for use as permselective

addition, the membrane has a porous support

separation

membranes,

and

with

membranes.

This involves

extruding

an

asymmetric

increasing face

of

the

diameter

has

is from

of

so that

membrane

that

diameter Patent

region

pore diameters,

gradually

dope

the opposite

an

average

50 to 10,000

pore

times

the

of the skin pores. number:

through

coagulation

chamber

subatmospheric

pressure.

fibre is conveyed

through

Inventor: I.F. Wang

at least two different

Publication date: 9 February

sequence.

1999

that

CO -selective membrane hydrogen reformation Research

process for

chamber,

extends

equipped

into

with

& Engineering

hollow

that extends

membrane membrane

liquids

arranged

in

includes

the

chamber,

and is for the

separator

liquid

relatively

membrane

is useful on-board

reforming

hydrocarbon, natural The

gasoline, aIso

hydrophylic

polymer

from about

total

for

a

halide

halide

salt

particularly

The

patent

filtration

modules

improved

tangentiaJ

purification

and

mixtures

of

of a

biological

interest.

from

from an on-board

gas for the CO,-selective

membrane

a gas

reformed

may

Applicant: Exxon

Research

on a

GmbH,

of

fibres in the

is substantially filtration

for

either

be

pressure

enhanced

large-scaIe The modules

with

or without

co-

of the filtrate.

exhibits

a columnar

and

preferred

comprises

number: WO 99107458

a porous

columnar

zeolite layer

zeolites,

interstices

layer in which one point A. The

about

zeolite

coated

a

99.9%

between patent

The

combined

The

patent

oxide

with metal

columnar

crystallographic

describes

have at least that is 520

a process

membrane

exhibiting

clusters

or

McHenry,

W.F.

Lai,

membranes and

Production with

1999

l-500

from vegetables

impurities

can

by filtration.

However,

by

membranes

through

backflushing

with

cleaning diameter oil refining

during

in the flux. The

regained

the membranes

tissue can be

filtration

stick to the membranes,

a reduction be

and animal

such as waxes, which

these impurities

regularly backblowing

edible

with

method

J.l? Verduijn

initial

an aIkaIine

distribution

and

aluminium

average

oxide

pore

radius

deviation

of O-20%

of

of the pore

(preferably

The

membranes

are

advantage

as catalysts

during

less

used

to

synthesis

of vinyl acetate.

with

A.

Dingerdissen,

Hagemeyer,

ion-exchange

Applicant: Pall Corporation,

treating The

suitable

The

U.

1999

preparation

for

porous

pore

organic

-

support

contacting

the

and

patent

grafted

is covalently group.

for treating

which

-

in this

mo’iety, to which

membrane. 1999

described

polymeric

in

USA

membrane

least one ion-exchange ions,

J.C. Segers, V.

membrane

ion-exchange

covers a method Den Bieman,

Werner,

G. Schmid

Publication date: 25 February

the

average

H.

K. Kiihlein,

gas,

material

an

Inventors:

with

pm, such as are used in edible

Publication date: 18 February

1999

The an

drying

of an oxygen-

flux

Stavridis

Publicarion date: 16 February

membranes

which

processes.

Inventors: H.A.C.I.

the

of ligand-stabilised

nm, with a standard 10%).

oxidation,

distribution.

or clusters,

cleaning

oil, and then

is particularly

microfilters of 0.5-5

coating

gas.

metal These

Patent number: WO 99108785

Plc, UK

Oils extracted

aIuminium noble

radius

solution

have

in the presence

contain

Technology

them in the presence

NV,

Netherlands;

&

by anodic

noble metaI nanoparticles

Unilever

a

J.A.

involves

Applicants:

The

oxide noble metal

nanopartides.

pore

a colloidal

particular

Unilever

metal

a close

containing

Patent number: WO 99107459 Deckman,

a

(or other

nanoporous

are obtained

have

for membranes

for

orientation. H.W.

a

1999

containing

noble

method

cleaning

number: US 5871650

Inventors:

with

to produce

nitrogen

Research

describes

Cleaning

causes

is a polycrystalline crystals

permeate

membranes

radius

removed or

20 and 2000 A in size.

adjacent also

growth-

This layer has

of its crystals

a zeolite

with

nanocrystaIline

layer

producing Patent

It

metal (or both).

between

columnar

morphology orientation.

crystaIs.

perhaps

which

layer and a layer

comprises

oxide or colloidal The

substrate

growth-enhancing

enhancing colloidal

cross-sectional

permeability,

Aventis

membranes

Co,

is described

crystaIlographic

mesoporous of

membrane

membrane

Germany

then burning

Inventor: R.D. Van Reis Publication date: 18 February

& Engineering

may

purification.

recirculation

from

than zeolite

a membrane

Nano orous aluminium mem l! ranes containing clusters Applicant:

especially protein

for

USA A new

a second

high-purity

The

fed to the

comprises

low intrinsic

of molecules which

provides

be employed

Patent

membranes layer

useful

modules

current

Supported zeolite growth-enhancing

gas.

gas is then

in which

unit

filtration-mediated

The transmembrane

filtration

recombinant 1999

molecules,

which

capabilities,

membrane

processes

flow,

membrane

Inventor:

W.-S. W. Ho

and

of the hollow

Patent number: WO 99106138 Publication date: 11 February

intermediate

retentate

device

fibre

along the entire length constant,

process.

hollow

separation

The

CO,

an

a

a

intrinsic

Inventor: R.A. Callahan

Inc, USA

describes

composition.

separating

1999

Hollow fibre coflow filtration Applicant: Genentech

in the formation

the

is suitable

membrane

or

10 to 80 wt% based on the

of

weight

composition mixture,

of ammonium

comprises

high

provide

permeate

stage,

which

Publication date: 23 February

of

and an ammonium

salt, with the amount ranging

methanol

a composition

for

- is fed to a

as

for fuel cell vehicles.

covers

first

Patent number: US 5873928

B. Bikson

gas, generated

diesel,

In the

- containing,

gas) product.

T.A. Bolan,

Publication date: 16 February

water

of a fuel - such

gas - to hydrogen patent

and/or

of a reformed

Inventors: J.T. Macheras,

is described

for the purification

gas shifr reaction from

process

second

unit,

and

are very

the use of a

process.

a relatively

to

intermediate

very

media.

with gas

and exit ports the

separator

permeate

the vacuum

of

gas through

97 ~01% of nitrogen

permeability,

and the column

removal

apparatus of a desired

membrane

about

and contains

Patent number: US 5871680

USA A CO,-selective

example,

a column

apparatus

and

stage a process feed gas mixture

the spinneret

and

coagulation

Co,

at

permeate

multiple-stage

chamber,

abutting

entrance

introduction

a

process

for the production

high-purity

into

nascent

membrane

described

a spinning

extends

The

A

composite

maintained

The processing

vacuum

that

that

into the reduced-pressure

US 5869174

Applicant: Exxon

a spinneret

for

its

has

with bonded

at

The patent

also

a fluid containing

the

ions

are

removed

fluid

with

this

ion-exchange

In addition,

filtration

apparatus

exchange

membrane

the patent

which to

a an

provides

utilises

remove

by

ions

this

a

ion-

from

a

fluid.

Spinning

hollow fibre membranes

Applicant: Praxair A process

Technology

is described

for the preparation

Membrane Technology No.108

Multi-stage membrane gas separation

Inc, USA of

Applicant: Enerfex

Inc, USA

process for

Patent number: WO 99109091 Inventors: J.Y. Lee, R.F. SaIinaro, Publication date: 25 February

I.l? Sipsas

1999

v