EP 3509739 A1 20190717 - ADSORBENT COMPRISING LAYERED DOUBLE HYDROXIDE AND ACTIVATED CARBON
Title (en)
ADSORBENT COMPRISING LAYERED DOUBLE HYDROXIDE AND ACTIVATED CARBON
Title (de)
ABSORPTIONSMITTEL MIT GESCHICHTETEM DOPPELHYDROXID UND AKTIVIERTER KOHLE
Title (fr)
ADSORBANT COMPRENANT UN HYDROXYDE DOUBLE LAMELLAIRE ET DU CHARBON ACTIF
Publication
Application
Priority
- EP 16187431 A 20160906
- EP 2017071010 W 20170821
Abstract (en)
[origin: WO2018046286A1] The present invention relates to a material that absorbs volatile compounds, in particular sulphurous compounds. It is found that an absorbent of high surface area suitable for highly volatile compounds can be obtained by growing nanoparticles of a layered double hydroxide (LDH) on the surface of powder activated carbon (PAC). Disclosed is a composite adsorbent comprising nanoparticles of a layered double hydroxide (LDH) and a powder activated carbon (PAC) of the general formula [M2+ 1-xM3+ x (OH)2]q+(Xn-)q/n.yH2O, in which, M2+ = Ca2+, Mg2+, Mn2+, Fe2+, CO2+, Ni2+, Cu2+ or Zn2+; M3+ = Al3+ or Fe3+; x = [M3+]/ [M3+ + M2+]; q = x n = 1 to 4; and, y = number of water molecules present on the LDH; X = anions selected from halides, sulphates, nitrates, carbonates or anionic moiety from organic sources wherein said composite is obtainable by a hydrothermal process comprising, in sequence, the steps of: (a) contacting, and mixing, powder activated carbon with a water soluble salt of M2+ and a water soluble salt of M3+; (b) adding an alkali to the dispersion of step (a); (c) aging the dispersion of step (b) by heating it to 80 to 100 °C; (d) separating, by any means, the aqueous phase of the dispersion from the dispersed phase; and (e) washing said dispersed phase with water to remove excess alkali, to get the composite adsorbent, wherein amount of nanoparticles of said layered double hydroxide (LDH) is 10 to 30% by weight and wherein particle size of said powder activated carbon is 50 μm to 500 μm.
IPC 8 full level
B01J 20/06 (2006.01); B01J 20/04 (2006.01); B01J 20/08 (2006.01); B01J 20/20 (2006.01); B01J 20/28 (2006.01); B01J 20/30 (2006.01); B01J 20/32 (2006.01)
CPC (source: EP)
B01J 20/041 (2013.01); B01J 20/06 (2013.01); B01J 20/08 (2013.01); B01J 20/20 (2013.01); B01J 20/28004 (2013.01); B01J 20/28064 (2013.01); B01J 20/3071 (2013.01); B01J 20/3204 (2013.01); B01J 20/3236 (2013.01); B01D 2253/25 (2013.01); B01D 2257/306 (2013.01)
Citation (search report)
See references of WO 2018046286A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
WO 2018046286 A1 20180315; CN 109689201 A 20190426; EP 3509739 A1 20190717
DOCDB simple family (application)
EP 2017071010 W 20170821; CN 201780054566 A 20170821; EP 17752153 A 20170821