流動接触分解に関する研究 (VI)
高アルミナ触媒と低アルミナ触媒の比較ならびに触媒の損失について
1961 年 4 巻 1 号 p. 34-38
詳細
1961 年 4 巻 1 号 p. 34-38
The object of this study is a comparison of several properties between high and low alumina catalysts obtained by the operating process during which 13% alumina catalyst in the reactor-regenerator system had gradually been replaced by 25% alumina catalyst.
Also, the catalyst loss from the regenerator stack, which has not been subjected to quantitative analysis so far, is investigated, taking the opportunity of the above-mentioned catalyst switchover.
1. The results of comparing between high and low alumina catalysts are as follows:
a) As for metal-resistant power of the catalyst, high alumina catalyst has shown superior results and the quantity of hydrogen production remained was about 70% of that expected in the case of low alumina catalyst under the same metal content.
b) The catalyst loss dropped by 30-60%, which can be attributed to higher anti-erosion and smaller heat break of high alumina catalysts.
c) High alumina catalyst exhibits an excellent retention of activity as well metal-resistance. When high alumina catalyst was used, the catalyst make-up requirement is only 70-80% (by wt.) of that of low alumina catalyst in order to keep the regenerated catalyst at the same activity level.
d) No appreciable effects of high alumina catalyst with regard to product yields and qualities have been noticed.
2. Quantitative measurements has not been carried out on the selective loss of the added fresh catalysts, although it has been known to some extent.
The catalyst fines have been collected from the regenerator stack gas, and tested for particle-size distribution, activity, metal content, alumina content, etc. The results of the test indicate that a considerable amount of fresh catalyst added to the system was being lost from the stack. The loss of fresh catalyst during the time of catalyst addition amounts to 1.5 to 2.0 times as much as that in the normal operation.
3. When the catalysts to be used are selected, due attention must be paid to its resistance to erosion and heat break as well as particle-size distribution so as to minimize the overall catalyst losses.
