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The 8 bit digital valve only gets you to one part in 255, although with a 10 bit valve you can get one part in 1023. I would look into an open loop system using a piston or diaphragm metering pump where you control the individual pulses. You would need a stirred inline mix tank to smooth out...

According to HSC Chemistry, H2S can react with water to form hydrogen and H2S5O3. That is possible but more likely the hydrogen results from metallic corrosion.

First you have to define your conditions. You cannot saturate with isobutane unless isobutane is a liquid under the conditions of interest. Here is a link to a vapor pressure graph for isobutane...

The heat of reaction is 10% less if your product is concentrated sodium hydroxide solution. NBS Circular 500 gives the heat of formation of sodium hydroxide as a function of dilution. For example,   NaH(c) + 4 H2O(l) --> NaOH:3H2O + H2(g) delHRxn, 25 C = -108.9 + 0 –(-13.7) –(-68.3) = -26.9...

You should be able to calculate it as a function of composition using the thermodynamic models in Aspen Plus or Pro II.

The actuation is on-off. I didn't mention the size of the valve. The maximum size will be 1/4" tube. I would prefer metal bellows sealed valves, but would live with Kalrez if necessary. The valve and seal bellows will be Hastelloy C-276. A Kalrez seat would be fine. Viton won't handle...

I need to install a small valve inside an oven operating at 150C. The oven wall is also a contamination control boundary so the valve operator will have to be inside the oven. Can anyone recommend a source of commercial valve operators which would operate in this service? I have sketched out...