The difference between the calculated crude benzene production based on the benzene content analysis of the gas and the actual amount is significant
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There is a significant discrepancy between the crude benzene production calculated based on the benzene content analysis of the gas before and after the benzene washing tower in the coking plant, as well as the gas generation volume, and the actual production volume. What is the reason for this, and how can it be resolved? Welcome, all experts, to discuss.
The values measured at the front and back of the tower are instantaneous values, so there is definitely some error. It’s the same in our factory as well; the calculations based on the values from the front and back of the tower yield a higher output than the actual one.
The values measured at the front and back of the tower are instantaneous values, so there is definitely some error. It’s the same in our factory as well; the calculations based on the values from the front and back of the tower yield a higher output than the actual one.
Even though the values measured before and after the tower are instantaneous and therefore subject to errors, the monthly average is still higher than the actual production volume, which is really confusing.
In my opinion, as long as you measure the content of crude benzene before and after the distillation tower, record the relevant temperature and pressure values, and follow the procedures carefully, it’s also important to know your benzene removal rate, as well as the efficiency of your benzene distillation tower. Additionally, you should pay attention to the amount of benzene present in the oil with low benzene content – these are all values that deserve attention
The indicators for benzene washing and removal are both normal. According to the law of conservation of mass, where has this portion of crude benzene gone?
This post was last edited by chemyang* on 2012-6-12 20:09. The oil absorbs the benzene derivatives in gas; in addition to benzene and toluene xylene, there are other compounds as well, both those with low boiling points and those with high boiling points. A portion is lost in the oil washing regenerator ； A portion that cannot be completely vaporized remains in the lean oil ； Some loss also occurs in the separated water after oil-water separation; water can dissolve many substances present in crude benzene, such as benzenes, sulfides, phenols, unsaturated compounds, and so on. Also, I’m not sure whether testing the benzene content in gas includes these impurities as well, or it refers solely to the amount of benzene itself Personal opinion.
Currently, to determine the content of crude benzene in gas, it is essentially done by first measuring the benzene content and then multiplying it by a coefficient to calculate the crude benzene content in the gas; in reality, however, the benzene content within crude benzene varies. It is also difficult to measure the gas volume accurately (the reverse pressure tube often gets clogged), and temperature and pressure corrections must be applied. Don’t take it too seriously; it’s just for reference. It will never match.