SEPARATION OF M-XYLENE - MITSUBISHI CHEM CORP

Title:

SEPARATION OF M-XYLENE

Document Type and Number:

Japanese Patent JPH0733689

Kind Code:

A

Abstract:

PURPOSE: To obtain high-purity m-xylene from a 8C aromatic compound mixture by a combination of chromatography and distillation.

CONSTITUTION: A mixture of 8C aromatic compounds is charged together with toluene used as a desorbent to a chromatographic separation apparatus 1 containing zeolite as an adsorbent and the mixture is separated into a m-xylene fraction and a non-m-xylene fraction. Each fraction is distilled to obtain toluene and a 8C fraction and toluene is recycled and reused. Toluene replenished from an external source is distilled (3) together with the non-m-xylene fraction to remove the accompanying 8C component and supplied to the chromatographic separation apparatus as a desorbent. The process is effective for preventing the contamination of m-xylene fraction with 8C component accompanying to the replenishing toluene.

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Inventors:

SHIODA TSUYOSHI
YASUDA HARUICHI
SAITO NORIYUKI
ASATANI HARUO
FURUICHI HIROSHI

Application Number:

JP18271493A

Publication Date:

February 03, 1995

Filing Date:

July 23, 1993

Export Citation:

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Assignee:

MITSUBISHI CHEM CORP

International Classes:

C07B63/00; C07C7/04; C07C7/13; C07C15/08; (IPC1-7): C07C15/08; C07B63/00; C07C7/13

Attorney, Agent or Firm:

Hasegawa Moji

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