What is the effect of the C6 fraction separated from the reprocessed reformate on reforming pre-hydrogenation?

The hydrogen consumption due to pre-hydrogenation temperature rise decreases, and the yield increases relative to the feed benzene yield.

Reprocessing C6 increases the material handling load for pre-hydrogenation; however, the hydrogenation intensity depends on the impurity content. It is estimated that the hydrogen-to-oil ratio will remain unchanged or decrease slightly, but hydrogen consumption will increase. Conventional considerations apply for separation. For reformation, it mainly increases the overall processing load as well as the intensity of the four reverse reactions; therefore, the load on the furnace and compressor will certainly increase, so it is necessary to consider an appropriate recycle ratio. For the product, it enhances the production of benzene; however, the increased intensity of the tetra-anti structure affects the coking of light components and the catalyst, so the impact of catalyst regeneration and the subsequent separation of the products must be taken into consideration.