Butane removal tower bottom product: C5 oil, alkaline-containing
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Dear colleagues, the C5 oil obtained from the bottom of our butane removal tower shows alkalinity when tested with phenolphthalein reagent, whereas the feed to the butane removal tower does not exhibit alkalinity. I would appreciate it if you could help me understand what causes this phenomenon What substance gives phenolphthalein its color?
Is there a system such as alkali washing before mixed butane enters the butane removal tower? Is it possible that trace amounts of alkaline substances enter the butane removal tower along with the material, and then accumulate there at the bottom of the tower together with C5 oil, resulting in an alkaline pH?
I agree with the opinion above – alkaline substances cannot be formed on their own; the most likely explanation is that they are present in the raw materials. Since the feed contains liquefied gas and C5 components, it is difficult to take samples for analysis. However, alkaline substances may accumulate in the heavier components, which is why the C5 mixture shows alkalinity when dissolved in water
I tested the raw material with phenolphthalein; it did not change color
The alkaline substances in the raw materials (such as basic nitrogen) may be present in trace amounts; if they are at the PPM level, can they be detected?
You mean that the alkaline substances in the raw materials get concentrated in the product, causing the pentane oil to become alkaline