A newbie has a question about cold high scores and cold low scores
Thread Content
In the reaction effluent, gas, liquid, and water are separated during cold fractionation; the gas is separated from the upper portion. Why is there still gas in the cold low-pressure fraction, and why does this gas contain a higher sulfur concentration than the recycle hydrogen? Is it due to differences in pressure? What is the exact reason?
Hydrogen sulfide dissolves in water and oil; its solubility is high at high pressures and low at low pressures. It dissolves more easily in water, especially in the presence of ammonia. As the pressure decreases from high to low, hydrogen sulfide is released. Its concentration is also determined by the amount of methane produced by the reaction, as well as whether there is heat involved.
There are no high scores in the hot category, nor any low scores
Just one cold low score and one cold high score
Because there is a pressure relief valve between the two. The saturated liquid within the high-pressure range is partially vaporized after passing through a pressure reducing valve, and then separated in the low-pressure range. High temperature and low pressure are also conducive to the removal of hydrogen sulfide from oils; after cold fractionation, it is likely to be a vapor removal tower, and heat exchange is certainly required in that process.