(3c) Thermochemistry of Catalyst Deactivation II: Competition between Hydrogenation, Condensation and Hydrocracking | AIChE

(3c) Thermochemistry of Catalyst Deactivation II: Competition between Hydrogenation, Condensation and Hydrocracking

Authors 

Robinson, P. R. - Presenter, Chevron Lummus Global


The
first paper in this series presented the results of equilibrium calculations
for the competition between the hydrogenation of naphthalene to form tetralin
and decalin (Reactions 1-2) and the condensation of naphthalene with o-xylene
to form chrysene (Reaction 3). This set of reactions was proposed as a simple model
for the coke-induced deactivation of hydrotreating catalysts.

Saturation
(Reversible)

1. Naphthalene (C10H8)
+ 2H2  ↔  Tetralin (C10H12)

2. Tetralin + 3H2 
↔  Decalin (C10H18)

Condensation
(Irreversible)

3. Naphthalene + o-Xylene  →
 Chrysene (C18H12) + 3H2

4. Chrysene  →
→ →  Coke + xH2

This
paper shows the effect of adding a hydrocracking reaction (Reaction 5).

Hydrocracking
(Irreversible)

5. Tetralin + H2
 →  1-propyl-2-methyl benzene (C10H14)

In
addition, for all reactions the thermochemical effects of hydrogen purity at
constant total pressure are computed, along with the effects of excess
hydrogen, i.e., ?gas-to-oil ratio.?