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Separation process for C8 aromatics mixture

A technology for aromatic compounds and mixtures, applied in distillation purification/separation, organic chemistry, azeotropic distillation, etc.

Active Publication Date: 2017-08-18
SCG CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Ethylbenzene can of course be separated from the xylene isomers by fractional distillation, but because the boiling points are so close to each other, fractional distillation is only achievable using more complex and energy intensive systems

Method used

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  • Separation process for C8 aromatics mixture

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Embodiment 1

[0030] Using the simulation software "Aspen "Computer simulations were performed to simulate a feed stream comprising 64.93 wt% ethylbenzene, 7.9 wt% p-xylene, 18.14 wt% m-xylene and 9.02 wt% ortho-xylene at a feed rate of 15000 kg / h Feed into an extractive distillation column having 130 stages. Various extraction solvents as shown in Table 1 were introduced into the extraction In the distillation column. As a comparative example, a simulation has been run without the introduction of solvent. The operating temperature is simulated along the column in the range of 75°C to 175°C. The pressure in the column is simulated as 200 mbar and 1000 mbar respectively (See Table 1 below.) The weight ratio of solvent to feed stream was fixed at 5:1. The simulation model further included the feature that an ethylbenzene-rich stream was drawn at the top of the column and an ethylbenzene-lean stream was drawn at the bottom of the column. A portion of the ethylbenzene-rich stream from the top...

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Abstract

Process for the distillative separation of ethylbenzene from a mixture comprising ethylbenzene and at least one other C8 aromatic compound, comprising distilling said mixture in a distillation column in the presence of an extractive solvent, characterized in that the distillation column is operated at a sub-atmospheric pressure.

Description

[0001] manual technical field [0002] The present invention relates to a process for separating ethylbenzene from a mixture comprising ethylbenzene and at least one other C8 aromatic compound by extractive distillation. Background technique [0003] Ethylbenzene is a hydrocarbon compound of high commercial utility and value. It is mainly used in the production of styrene which is an intermediate used in polystyrene production. Ethylbenzene is produced commercially from the alkylation of benzene with ethylene. However, the cost and competing demands of ethylene and benzene have spurred new efforts to recover ethylbenzene from various C8 aromatic feed streams that already contain ethylbenzene. Such feed streams are typically produced as by-product streams from various petrochemical processes, and they typically contain ethylbenzene and one or more hydrocarbon compounds boiling close to the boiling point of ethylbenzene, particularly the C8 aromatic isomers. [0004] Method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/08
CPCB01D3/40C07C7/08C07C15/073C07C15/08C07C7/04B01D3/36B01D3/38C07C7/06
Inventor 阿塔邦·提拉萨阿里萨·卡玛夫维伦·丹他巴尼查孔丁忠义萨钦·乔什阿纳特·蓬邦格勒姆瓦拉武·塔姆泰松普尔查特·皮提普埃奇
Owner SCG CHEM CO LTD
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