Discussion on pressure and temperature in coal tar hydrogenation reactions
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If the pressure in the hydrogenation unit is controlled at 120 kilograms and increased to 130 kilograms, what changes can be expected in the reaction temperature? What changes will occur in the nitrogen content of the tail oil? And what changes will there be in the boiling range of the tail oil?
In hydrogenation units, pressure has a limited impact on system temperature; increasing pressure is beneficial for nitrogen removal and preventing catalyst coking.
Coal tar has a high content of aromatics; increasing the pressure facilitates the hydrogenation of these aromatics. The nitrogen content in the tail oil should decrease, resulting in a simpler process.