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AssigneesChina Petroleum & Chemical Corporation, Research Institute of Petroleum Processing, Sinopec
InventorsDehua Wang, Zhuo Yu, Huiguo Wang, Jiangfeng Ma
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The present invention relates to a process for separating isomers by simulated moving bed (SMB) adsorption, comprising separating the raw materials comprising isomers by SMB adsorption, said SMB comprising many adsorption beds each of which is equipped with grids, each of the grids being equipped with the feedstock inlet and outlet pipeline of the bed, the feedstock charged into and discharged from SMB at least comprising feedstocks, desorbent, extract, and raffinate, the extract being enriched with the target product, characterized in that the extract is used as a flushing liquid and respectively charged to first or second bed at the upstream of the feedstock charging position and to one of second to fourth beds at the downstream of the extract withdrawing position. Such process is used for separation of C8 aromatic isomers by adsorption, and can improve the capacity of the device while effectively increasing the purity of the target product separated by adsorption.
A process for separating isomers by simulated moving bed (SMB) adsorption, comprising separating the feedstock comprising isomers by SMB adsorption, said SMB comprising many adsorption beds each of which is equipped with grids, each of the grids being equipped with the materials charging and discharging pipeline of the bed, the materials charged into and discharged from SMB at least comprising feedstock, desorbent, extract, and raffinate, the extract being enriched with the target product, characterized in that the extract is used as a flushing liquid and respectively charged to first or second bed at the upstream of the feedstock charging position and to one of second to fourth beds at the downstream of the extract withdrawing position.
A device for separating isomers by simulated moving bed (SMB) adsorption, comprising SMB and materials inlet and outlet pipeline, said SMB comprising many beds of adsorbent each of which is equipped with grids, each of the grids being equipped with the materials inlet and outlet pipeline of the bed, two flushing liquid pipelines being set up in parallel on the materials inlet and outlet pipeline of the bed, each of the flushing liquid pipelines being equipped with an on-off valve, the extract being used as the flushing liquid, the flushing liquid in one flushing liquid pipeline being charged to first or second bed at the upstream of the feedstock charging bed, and the flushing liquid in the other flushing liquid pipeline being charged to one of second to fourth beds at the downstream of the extract withdrawing position.
Dependencies are inferred from the claim text.