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Innovative adsorption system and process for cost efficient natural gas treatment

Objective



Objectives and content
Around 35% of the natural gas reserves are available
world-wide in which the reservoir formation hydrocarbons
are contaminated with significant quantities of nonburning components such as N2 or CO2, either in their
initial composition or due to enhanced oil recovery for
which large quantities of these gases have been injected
in the structure. The presence of such components in
significant concentration (typically higher than 5%)
reduces the heating value of the gas and results in
specifications unsuitable with existing transmission and
distribution systems for commercial gas So far, less than
10% of natural gas wells containing N2 large contents are
produced as cryogenic processes for N2 removal are rarely
implemented on production sites due to their high capital
cost For small quantities of CO2 removal (<10%), amine
absorption is widely used on sites; for larger amounts,
alternative low temperature processes (such as RyanHolmes) lead to prohibitive capital costs. Therefore
there is a strong industrial need of innovative and low
cost processes for the on-site N2 and CO2 removal from
low Btu natural gas. This is exactly the purpose of this
project to develop an innovative adsorption based process
that will offer a realistic and cost efficient solution
for the production of high content N2 or CO2 natural gas
reserves whose exploitation has so far remained hindered
due to the lack of adapted process to make the produced
gas fit pipelines specifications. To reach this
industrial objective, it is necessary:
to develop a highly selective and low cost adsorbent
(clinoptilolite natural zeolite),
to develop an innovative adsorption process (PSA
technology),
to define innovative natural gas treatment schemes
including developed adsorption unit
These technological objectives will lead to a competitive
process by achieving the following targets:
Š the product gas will reach pipeline specifications
having a minimum heating value of 960 BTU/SCF (35 8 MJ/m3
(st)) and containing at the most 4% mol. N2 and 2% mol.
CO2 (maximum allowable).
Š the natural gas recovery will be in the range of 90-95
% mol. according to the feed inert content
Š the cost reduction will be (for a medium size plant
capacity of 2.5Mm3(st)/d and compared to actual
processes)
for a N2 (>l0%) removal unit, the reduction is
estimated to around 20 % on CAPEX and 30% on OPEX
for a CO2 (>10%) removal unit, the reduction is
estimated to around 20 % on OPEX.
in the case of simultaneous N2 and CO2 removal, for a
natural gas that contains l0% of N2 and 10% of CO2, the
cost reduction is estimated to be higher than 50 % on
both CAPEX and OPEX.This important benefit will result
from the global approach of the ADPRONAG process which
integrates the two separations in a single unit
The success of this ADPRONAG project will lead to an
innovative process that will enable the exploitation of
high content N2 and CO2 gas reservoirs and consequently
contribute to the increase of the supply and to the
security supply in natural gas for the European
Community, while taking care of the environment.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

GROUPEMENT EUROPÉEN DE RECHERCHES TECHNOLOGIQUES SUR LES HYDROCARBURES
Address
Avenue Napoléon Bonaparte 232
92500 Rueil Malmaison
France

Participants (6)

Hellenic Petroleum S.A.
Greece
Address
199,Kifissias Avenue
15124 Athens
IMPERIAL COLLEGE OF SCIENCE, TECHNOLOGY AND MEDICINE
United Kingdom
Address
South Kensington
SW7 2AZ London
NATIONAL CENTRE FOR SCIENTIFIC RESEARCH 'DEMOKRITOS'
Greece
Address
Aghia Paraskevi Attikis
15310 Athens
S&B INDUSTRIAL MINERALS GMBH
Germany
Address
78,Schmielenfeldstrasse 78
45772 Marl
UNIVERSITAET LEIPZIG
Germany
Address
5,Linnéstrasse 5
04103 Leipzig
Viana SA
Greece
Address
10,Apolloniou
19400 Koropi