Investigation of the peculiarities of catalytic cracking in a stepwise counter — current reactor by collection of intermediate samples

Conclusions

• 1. The design of a sample collector and method of collecting samples of vapors from the dusty zone of apparatuses with a boiling bed were described.

• 2. Using the sample collector developed, the course of the conversion of the crude and change in the yields and quality of the products according to zones of the stepwise-counter-current catalytic cracking reactor were studied.

• 3. An investigation of the course of catalytic cracking according to sections of the stepwise counter-current reactor with an isothermal system and with a temperature drop indicated that:

• a) in the first three sections of the reactor the yield of gasoline reaches 80–90% by weight of its total yield in the reactor at a degree of conversion of the crude of about 78–90% and yield of gas no more than 45% of the final value;

• b) in the following sections of the apparatus the gasoline quality is improved (decrease in the iodine number and sulfur content, increase in the octane number) and gaseous olefins are supplementarily formed;

• c) for the same average temperature of the process, in experiments with a temperature drop along the height of the reactor, the yield of gasoline and isobutane increases somewhat with analogous degrees of conversion of the crude, yield of gas and coke.

• 4. The method and sample collector developed can be used to investigate other processes in a boiling bed.