Sorry I left out a couple of important points:
There are a range of ionic salts in the reaction mixture as well. None of which will contribute to the pressure. This is the current scale of the reaction which is done in a pressure vessel which we have no information on. We are wanting to scale this to a 1L reaction. The reaction is performed at 250 degC.
you just wrote
(1) your 7.6 mL of reactants contains variety of ionic salts
(2) you have no information about the reactor other than its a pressure vessel
(3) you want to scale the reactor up to handle 1 L of your reactants
(4) the reaction temp is 250°C
in addition to your previous statements of
(5) reactants are 0.6mL 1M HCl + 3mL H2O + 4 mL of 30% HCl
(6) you have no chemistry background
(7) is pressure and volume related.
my general comments are
(1) Your reaction doesn't make sense. What exactly are you trying to make?
(2) if you don't have a background in chemistry or chemical engineering,
you should not be attempting this.
(3) to properly scale up a reactor involves identifying reactor and reaction
parameters and defining dimensionless scaleable variables. That can't
be done without more information than you've given here.
My suggestion to you is this. If this is for an industrial application, hire an outside consultant.