2011 Spring Meeting & 7th Global Congress on Process Safety
(95c) Catalytic Membrane Reactor In the Treatment of Waste Water
Authors
Catalytic
membrane reactor in the treatment of waste water
MartÃnez.
B1, Torres. M1*, Montoya. A2, Gutiérrez. M1,
Aguilar. J1
1Departamento de Ciencias Básicas,
Universidad Autónoma Metropolitana-Azcapotzalco, Av.
San Pablo Nº 180, Col. Reynosa Tamaulipas, Azcapotzalco,
02200, México, D.F
2Direccion de Investigación y Posgrado,
Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas Norte Nº 152, Col.
San Bartolo Atepehuacán, 07730, México, D. F.
*e-mail trm@correo.azc.uam.mx
Keyword,
Membrane reactor, Catalytic
wet oxidation, Nanoparticles, Contactor
A membrane
reactor with a liquid and gas flowing on different sides of the catalytic
membrane is called catalytic diffuser. The gas diffuses through the macropores membrane layer and dissolves in the waste water
at the interface (figure 1).
Figure 1. Contactor
membrane reactor schema
In this work we use a
diffuser membrane reactor configuration for the elimination of formaldehyde in
water. The active phase of catalytic membrane is gold nanoparticles
that are dispersed onto the macropores of the
membrane. The ceramic support is a tubular membrane of the company Pall-Exekia (α-alumina,
T1-70), with dimensions: 15 cm length, inner
diameter of 0.7 cm and outer diameter of 1.0 cm, with an average pore size of
0.2 microns. The catalytic test consists of a feed zone, a reaction zone and
analysis zone. The catalytic membrane is mounted on a stainless steel cylinder jacket containing the ceramic membrane, this
configuration was divided the reactor in two chambers, the liquid is fed to the inner membrane with a pump
and the outer one was used for feeding the pure oxygen
gas-phase, it imposed a differential pressure between the two
phases of 0.5 bar, and the oxygen pressure was 5 bar. The oxidation of
formaldehyde was studied at a temperature of 60 ° C with three different concentrations
of formaldehyde, 200, 300, 500 ppm. In a time of 60
min was reached a conversion of 95% for concentrations of 100 and 300 ppm and 38% for 500 ppm. The
reaction products were determined by GC. The catalytic membrane reactor shows good performance for this reaction.