Those familiar with aromatic extraction are welcome to offer guidance
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I am currently conducting technical research for a project, and I have several questions regarding aromatic extraction. I hope those who are familiar with this topic can provide some guidance: 1. If the mixed aromatics obtained after benzene extraction are fed into another aromatic extraction unit, is it possible to separate the non-aromatic components (about 10%) from the aromatic components (about 90%) in one step? 2. The most significant factor affecting the projects under consideration is the presence of C10 alkanes (with similar boiling points); although their concentration is only about 0.2%, they still affect the purity of our target product. Therefore, I would like to ask whether it is possible to remove C10 alkanes completely from the C9 aromatics after aromatic extraction 3. Is the heavy aromatic by-product from current aromatic extraction units obtained directly from the heavy fractionation tower, or is it separated after passing through the extraction tower? Welcome everyone to offer your guidance!
1. The mixed aromatics after extraction go to the clay column to remove olefins, and then to the benzene column. 2. Obtained from the degassing tower; a small portion of material with a molecular weight above C9 is obtained from the bottom of the xylene tower
Here, we separate the fractions below C5 and C7 through post-fractionation; the extracted feed consisting only of the C6C7 fraction is called mixed benzene. Gasoline with high octane number is used for grades below C7. C5 goes to other processes.
Aromatic extraction, also known as aromatic distillation, is a liquid-liquid extraction process in which an extractant is used to separate aromatics from hydrocarbon mixtures. Primarily used for recovering light aromatic hydrocarbons from catalytic reforming and hydrocarbon cracking gases
Does that mean the C8 component is also directly cut out and separated as mixed xylene? Won’t that contain non-aromatics? Because I saw online today that previous information about Jin Weihui mentioned that xylene obtained through direct cutting requires quite strict conditions in order to meet national standards!
Are all those above C7 sent together for gasoline blending?
Directly cut; non-aromatic compounds are removed at the non-aromatic washing tower and at the top of the benzene tower
Hello, my friend. It seems that no additional extraction unit is in use after the aromatic compounds have been extracted; the non-aromatic compounds should have been removed essentially in the stripping tower. The C9 compounds and those with higher molecular weights were separated out in the octane removal tower before they reached the extraction stage. C6--C8 as the extraction feed
Surely, non-aromatic compounds with a high carbon count cannot be separated at the top of the benzene tower
My goal is actually to achieve C9:victory:
I’m not very familiar with your plant’s processing procedures. It seems that first, the material goes through a degassing tower to separate the heavy and light components; only after degassing does it proceed to the extraction tower and subsequent processes