On the reaction depth of catalytic cracking
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This post was last edited by jbcyf on 2011-11-4 10:01. What is reaction depth? What changes occur when the terminator is added and at the reaction temperature? Why? When the reaction depth is large, which product will be produced in larger amounts?
The reaction depth refers to the extent to which the reaction has progressed, and it is generally expressed by the reaction temperature. Increasing the temperature increases the reaction depth; the termination agent only suppresses excessive cracking, which means that the reaction depth is slightly reduced, but all of the components that are supposed to crack do so. Increasing the reaction temperature raises the production of gas and gasoline; due to excessive cracking, diesel is converted into gasoline, and gasoline is converted into gas. The yield of coke also increases.
Reply to 2# dugutianzuo5: Then why do we sometimes use a terminator to control the reaction depth here? Has the depth of the dose-response curve at termination decreased?
It has become relatively smaller; the terminator stops deep cracking, such as the cracking of gasoline components like C5 into C1 and C2.
As the termination dose increases, the reaction temperature decreases accordingly, and the degree of reaction also decreases as a result.
The exit temperature of the riser is generally kept constant; the addition of a terminator effectively increases the agent-to-oil ratio