Reformation chlorination
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Dear experts in reformation, I would like to ask why the chlorine dosage in the reformation reaction is less than that in regeneration Assuming a long shutdown period for regeneration.
If regeneration stops for more than two hours, a reformation reaction involving chlorine injection must be carried out; the hydrogen content in the circulating water should remain stable without any significant fluctuations, and the C1/C3 ratio in the overhead gas from the pentane removal tower should be between 0.7 and 1.0
Chlorine injection during the reformation reaction is merely to prevent the loss of chlorine from the catalyst (related to the water-chlorine balance), whereas chlorine injection during regeneration is used to replenish the chlorine lost from the catalyst (the injection amount is generally twice the amount of chlorine lost).
Rechlorination is merely used to replenish the lost chlorine and maintain the water-chlorine balance； However, after the regeneration of tetrachloroethylene decomposes, a Dick equilibrium reaction occurs under conditions of oxygen and water. Cl2C=Cl2C + 2 O2 = 2 Cl2 + 2 CO2; 2 Cl2 + 2 H2O 《==》 4HCl + O2 (a dynamic equilibrium/reversible reaction). As a result, more tetrachloroethylene is required in order to achieve a chlorine injection level that satisfies the water-chlorine equilibrium