shape cylinder dimension mm Φ1.8～2.0×3～8 (orΦ1.2～1.6×3～6trilobite) bulk density kg/l 0.65～0.75 crushing strength N/mm ≥9.8 abrasion w% ＜1 specific surface area m2/g ＞250
(II)、Activity index
pressure MPa
temperature ℃
volume space velocity h-1
hydrogen oil volume ratio
4.0
*
1.0
420
Feedstock
the blending oil of AGO and light VGO of Shengli crude
activity evaluation
when reaching the initial equilibrium period, reaction temperature keeping steadily for 72 hours continuously, standard reaction temperature ≤380℃ considered as up to standard
* Reaction temperature takes the pour point to control the product diesel fraction at -10℃ as standard.
(III)、Results of industrial running The dewaxing device of Shengli Refinery of Qilu Petrochemical Corporation was put into producing in 1982, the first batch of catalyst used is the imported ZSM-5 catalyst, after that, in Oct.1986, it began to use the first generation amine type molecular sieve catalyst—catalyst 3862. From Oct. 1988, it adopted catalyst 3881 regularly. The effect of running was fairly good. From the results of using the first batch of catalyst HT-3881 in the industrial dewaxing device, we can see that in case of the other technology parameters (such as space velocity etc.) are in the same condition the average reaction temperature of both the reactor inlet and bed layer are about 10℃ lower than using imported catalyst, and 15℃ lower than the standard reaction temperature. hydrodewaxing catalyst shows that the activity of catalyst 3881 is rather high. From the yield point of view, we can see that in the initial running period, the total liquid yield of using domestic catalyst or the imported catalyst is about the same. But after hydrogen activated the yield of using the domestic catalyst has the tendency to increase gradually and the main product, diesel, yield is higher than the imported catalyst all along. This shows that the selectivity and stability of this catalyst is also rather high. A comparison of the results of industrial runs between catalyst HT-3881 and the same kind of the imported catalyst are as following.
initial period of operation
before regeneration
initial period scaling of imported catalyst
scaling time
88.10.25
89.9.14
feed
blending oil of AGO and light VGO of Shengli crude
Contact person：Jane peng E-mail:jane@pxlihua.com
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