Filter issues in the vacuum distillation tower
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Why does the pressure reduction tower have multiple filters? Where do the impurities filtered by these filters come from?
That’s right; filters have been installed on both the side stream and reflux lines of our vacuum distillation tower. Our feed materials are filtered before being fed into the system. Hydrocracking and hydroisomerization are carried out using three-stage or four-stage refined oil along with hydrocracking tail oil. Why is filtering necessary not only at the feed stage but also within the vacuum distillation tower?
It’s possible that your material has heat-sensitive issues; although the feed material is filtered, heat-sensitive side reactions, coking reactions, oligomerization reactions, and other such reactions may occur during the distillation process, resulting in impurities forming inside the tower. These impurities are then removed through filtration.
Here is a more authoritative answer: there are three main sources. The first is the catalyst solid particles from the reactor, which are carried into the vacuum distillation tower; these solid particles cannot be removed by the filter at the pump inlet due to differences in particle size； The second source is the packing in the vacuum distillation tower itself; the reason for this is not specified here, but it should become clear once one considers the origin of the packing used in the vacuum distillation tower ； The third is caused by coking in the furnace tubes of the vacuum furnace. There is another place where rust deposits from pipes, towers, etc. might be present. If there are any mistakes, I hope experts can point them out!
1. In a vacuum furnace, coke formation in the furnace tubes can occur due to high temperatures or improper operation, resulting in coke particles； 2. Rust scales inside pipes, towers, and equipment. Removing it through a filter is very beneficial for production!