The purity of benzene can never be increased to above 99.99%
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Dear experts, our aromatic hydrocarbon plant uses the UOP process in its entirety, comprising units for disproportionation, extraction, and aromatic separation. The operations in each of these units are stable, and the non-aromatic content in the feed to the benzene tower (extracted oil + products of disproportionation reaction) is below 0.1%. However, the purity of benzene can never be raised above 99.99; it remains between 99.85 and 99.93. Experts, do you have any good tips? I hope you can offer some guidance.
There’s a bit more toluene present; what’s the toluene content?
What is the impurity, non-aromatic or toluene?
If the non-aromatic content in benzene is high, adjust the extraction tower.
High content of non-aromatics; in addition to adjusting the extraction tower； Benzene is regularly discharged externally, once per shift
There has been a continuous release of toluene; the toluene content is approximately 0.01
These have all been adjusted. There’s no significant effect.
Send over the analysis report data for the sample; a purity of 3 nines is acceptable
In fact, the toluene content is still a bit high; we keep it below 50 PPM as per our standards. You need to carefully adjust the feed temperature for the benzene tower, as well as the temperatures at the upper and lower feed inlets of the tower, and control the temperature differences – precise adjustments are necessary for the distillation tower
The cause lies in the extraction process of the raw materials; during the extraction of aromatic compounds from these raw materials, those compounds that are non-aromatic or have boiling points close to that of benzene were not extracted properly
I would like to ask everyone: is working in a restructuring workshop harmful to one’s health? Especially benzene