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Rectification and extraction crossing and combining separation process of carbon 9 arene

A technology for extraction and aromatics, which is applied in the field of C9 aromatics rectification and extraction interleaved combination separation process, which can solve the problems of different separation sequences and separation means

Inactive Publication Date: 2005-11-09
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the different separation sequences and separation methods of various isomers, there are great differences between various refining methods

Method used

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  • Rectification and extraction crossing and combining separation process of carbon 9 arene

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Effect test

Embodiment 1

[0015] Embodiment 1, the equipment used in this process includes electric heating jacket, tower kettle, glass fiber cotton, filler, glass rotor flow agent, preheater, reflux liquid observation room, tower top thermometer, condenser, raw material high level tank, electromagnetic rod, solvent Head tank, tower top sampler, tower kettle thermometer, tower kettle sampler. C9 mixed aromatics extracted from Jinling Petrochemical Refinery are used. The raw materials are separated by rectification tower. The bottom material of the rectification tower is separated by the extraction tower. The experiment is carried out under normal pressure. The inner diameter of the tower is 22mm, and the inner diameter of the tower is 22mm. It is equipped with φ3×3θ type stainless steel packing. According to the standard system, the height of the packing is HETP=27mm, and the electric heating jacket is used for the tower kettle Heating, tower top product discharge, raw materials, and solvent feed are a...

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Abstract

A separation process of C9 arylhydrocarbon by alternative rectifying and extracting includes rectifying C9 arylhydrocarbon to obtain light C9 at tower top and heavy C9 in still, extracting heavy C9 in extraction tower to obtain p-toluene ethylbenzene at tower top and the liquid mixture in still, regenerating the liquid mixture in regeneration tower to obtain the liquid mixture of sym-tritoluene, o-toluene ethylbenzene and meta-tritoluene at tower top and the extractant in still for reuse, rectifying said liquid mixture in the second rectifying tower to obtain liquid mixture in tower top and the meta-tritoluene solution at bottom, rectifying said liquid mixture in third rectifying tower to obtain sym-tritoluene at tower top, and regenerating the liquid mixture of third rectifying tower to obtain O-toluene ethylbenzen.

Description

technical field [0001] The present invention relates to a C 9 The rectification and extraction of aromatics are interleaved with the separation process. Background technique [0002] The bottom oil of the xylene tower of the platinum reforming unit in the refinery contains aromatics and non-aromatics from C5 to C10. More than 20 domestic catalytic reforming units can produce about 120,000 tons of heavy aromatics per year. These resources have not been fully separated and Utilization, most of them are blended into gasoline or burned as fuel, wasting precious resources. In recent years, with the development of deep processing of C9 aromatics, the separation of high-purity C9 is becoming more and more important, so the research on their separation is also in-depth. For example, mesitylene in C9 is an important fine chemical raw material, which is currently in short supply in China. It has a wide range of applications in many aspects, mainly used for cellulose printing, pad d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/08C07C7/10C07C15/02
Inventor 顾正桂王春梅杨胜凯
Owner NANJING NORMAL UNIVERSITY