Some kinetic parameters have been determined in this work for thermal and catalytic
cracking of the mixed of polyethylene and polypropylene using batch method. The
cracking reaction was carried out at different temperature 470,490 and 510oC under
atmospheric pressure. The mass of products (liquid and gas fractions) were determined and
used to plot the curves of the thermal and catalytic decomposition. We used two types of
catalysts: Syrian natural Zeolite and the same after loading with sulfate ions using
impregnation method. The thermal cracking has a long time and has firs-pseud order
reaction. While in the case of catalytic process we note that the reaction finished in the
short time and the process is the Zero-pseud order reaction. The rate of the cracking
increased very much, the rate constant was k1=0.0032.min-1 in the thermal cracking at
4700C and ko=0.111.min-1 in the case of catalytic cracking in presence of Z catalyst and
ko= 0.206 min-1 in presence of 15-SO4
2-/Z as catalytic at the same temperature. In the other
hand activation energy was 208.7 kj/mol in the thermal process and decreased to 116.6
kj/mol at Z catalytic presence and to 87.3 kj/mol at 15-SO4
2-/Z catalytic presence.
Zeolite bearing deposits were characterized in Banyas region using sample A
(which is a powdered mixture taken from five tuff and tuffite levels) compared with
sample B (which is taken from Basatin Al-Assad site within the studied region).
XRD met
hod showed several zeolite phases in addition to non-zeolite minerals
and volcanic glass. FTIR method revealed a general feature of zeolite groups. DTA
method showed a range within zeolite structure stability. Specific surface area was
measured using BET method giving the value 87m2/g. The range of pore volume
distribution was also calculated with ~40Ǻ, and intermediate pore diameter of ~23Ǻ.
XRD study of the standard sample (B) showed slightly different zeolite phases
from A. FTIR measurement showed same results as in A. DTA plots revealed a high
stability of sample B, SBET of 61m2/g, VP around 40Ǻ and r- at ~25Ǻ.
Syrian natural zeolit was used to study the adsorption of phenol from aqueous
solutions. Batch method was used to study the adsorption process.
The results showed that the adsorption process accurs rabidly at the first time and the
equilibrium ach
ieved after 120min .
The adsorption process performed in the rang of PH (3-10). The adsorption of phenol
increased by increasing of PH value up to(6-7) and then decreased.
The temperature affect the adsorption process and the results showed that the
increasing of the temperature leads to decreasing of the adsorption of phenol.The
maximum adsorption amount of phenol was 8 mg/g at 25C0 when the initial concentration
of phenol was 60mg/l.
Adsorption amount of phenol increased when the adsorbent dosage increased up to
0.3g of zeolite.
The resulted data of the adsorption isotherm were fitted with Langmuire model and
the monomolecular layer adsorption formed on the surdace of the adsorbent.
