| 摘要 |
A process for the transalkylation of benzene, toluene and alkylaromatic hydrocarbons containing 9 and 10 carbon atoms and at least one methyl or ethyl group to form alkylaromatic hydrocarbons containing 8 carbon atoms has been developed. The benzene, toluene, and alkylaromatic hydrocarbon reactants are introduced to a fixed bed reaction and adsorption zone operating under conditions effective for transalkylation and containing a catalyst effective to transalkylate the alkylaromatic hydrocarbons and benzene, and an adsorbent effective to selectively adsorb C9 and C10 alkylaromatic hydrocarbon reactants relative to the C8 alkylaromatic hydrocarbon products. Hydrogen and a desorbent capable of desorbing the C9 and C10 alkylaromatic hydrocarbons from the adsorbent is introduced to a first portion of the reaction and adsorption zone and an effluent containing at least one C8 alkylaromatic hydrocarbon product is withdrawn from a second portion of the reaction and adsorption zone. After a period of time, the desorbent is redirected to the second portion of the reaction and adsorption zone and concurrently the effluent containing at least one C8 alkylaromatic hydrocarbon product is withdrawn from the first portion of the reaction and adsorption zone. The alternation of introducing the desorbent to a first portion and then a second portion of the reaction and adsorption zone while concurrently withdrawing the effluent from the second portion and then the first portion of the reaction and adsorption zone is continued, thereby retaining the C9 and C10 alkylaromatic hydrocarbons within the reaction and adsorption zone until they are consumed.
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