The benzene products from the continuous reforming-aromatic extraction combined unit contain high levels of thiophene; could experts please analyze the reasons for this?
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In the continuous reforming-aromatic extraction combined unit, the extraction system uses sulfolane as the solvent, and benzene and toluene are separated after treatment with clay.
The cause should be investigated by examining the raw materials used in the reforming process; it is necessary to check whether the level of S in the feed or during intermediate blending is too high. S promotes the formation of thiophene, and thiophene has a similar boiling range to benzene. From pre-hydrogenation to the final extraction stage, this thiophene accumulates in the resulting benzene product, resulting in substandard quality of the benzene.
Let’s take a look at the process route; it is a process that involves hydrogenation first followed by reforming, so the sulfur content should be very low. It’s necessary to test the sulfur content in the feed material used for reforming
The cause can be identified in the extraction unit; alternatively, replacing the white clay can ensure satisfactory adsorption performance