70/30 n-butane/propane VS. 50/50 n-butane/propane. Pressure LIMITS

Using 70%n-butane/30%propane.
150 psi rated loop
What’s the most propane I can mix with the n-butane?!

Is 50/50 to much?

My method I’m using now is-
Solvent tank in dry ice isopropyl bath (cold cold cold)
Chilled column with live flash frozen material (the good stuff lol😎)
Using nitrogen to push the butane into column
30 minute soak
Run more butane through
Nitrogen push in column/tank/honeypot have been maintained to 60psi on gauges. The nitrogen is burped out do solvent tank and honeypot to prevent the gas from getting between the honeypot and solvent tank particularly (during recovery). Solvent tank gets burped also to prevent pressure/mixing after running more butane following soak.
Getting rad results, but maybe a little more propane could continue consistent results. Maybe more propane could even improve quality even more?

Bumping for interest

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We have made blends of 80% propane, 10% Nbut and 10% Isobut. I’ve found that many “chefs” in the industry experiment with different formulas to achieve their targeted output.

Good idea to always burp out the nitrogen. Nitrogen will dissolve in the liquids and create problems as it bubbles out through the whole system. We never use nitrogen at our gas plant - we transfer with liquid pumps or by heating the donor cylinder to raise the vapor pressure of the hydrocarbon for batter transfer to the target cylinder.

Years ago I had a customer who kept a constant pressure of 150 psi nitrogen in his pure Nbut tank to push the liquid phase gas through his distribution system for introduction to his processing equipment. Just like beer that has CO2/N2 gas blend dissolved into it, the gases will bubble out if the flow is disturbed by angles in the distribution line or if it experiences temperature variances along the line.

Regards, Jim

This all depends om your temp.