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Process for the production of paraxylene that comprises an adsorption stage, a liquid phase isomerization atage and a gas phase isomerization stage with an euo-type zeolite
Process for the production of paraxylene that comprises an adsorption stage, a liquid phase isomerization atage and a gas phase isomerization stage with an euo-type zeolite
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机译:对位二甲苯的生产方法,其包括具有euo型沸石的吸附阶段,液相异构化粗粒化和气相异构化阶段
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摘要
A process for the production of paraxylene is described that comprises an adsorption stage (18) that uses toluene as a desorbent in a simulated moving bed of a feedstock whose ethylbenzene was separated by distillation (line 3) or by adsorption, an isomerization stage (26) without hydrogen in liquid phase that is diluted with toluene from the raffinate produced, a distillation stage (27) of the raffinate that is isomerized to recover the toluene (line 29) that is recycled. The separated isomerate is introduced into a xylene distillation column (9) then recycled, in adsorption. The separated ethylbenzene is isomerized separately in gas phase with hydrogen at higher temperature and is distilled (5, 2, 9) in the presence of a catalyst that comprises an EUO-structural-type zeolite, then recycled in adsorption column (18). The pure paraxylene is collected as extract (line 22) then optionally purified by crystallization (17). ;Application for the synthesis of terephthalic acid.
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