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A high-efficiency and energy-saving xylene separation process

A m-xylene and process technology, which is applied in the field of separation and purification of aromatic xylene, can solve problems such as unsatisfactory residence time, achieve the effects of saving reactor volume, long material residence time, and eliminating excessive reaction

Active Publication Date: 2020-07-03
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current impingement flow reactors pay more attention to the improvement of the impact effect, generally the improvement of the single-pot mixing effect. For the reaction that requires a certain residence time and conversion rate, due to the limitation of the reactor form, this improvement can be achieved. Ultimate - to achieve the ideal fully mixed flow reactor state, but also unable to meet the residence time requirements

Method used

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  • A high-efficiency and energy-saving xylene separation process
  • A high-efficiency and energy-saving xylene separation process
  • A high-efficiency and energy-saving xylene separation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Raw material C8 aromatics plus xylene concentration 20wt%, HF and BF in the extractant 3 The concentration is 20wt%.

[0043] The feed ratio of extractant and C8 aromatics is 2:1 (volume ratio). The extractant and C8 aromatics are respectively pumped into the impinging flow reactor, and are rapidly mixed with the circulating material in the impinging flow reactor for complexation In the reactive extraction process, the circulating material rate is 200% of the feed amount. The operating temperature was controlled at 3 °C, the residence time was 10 min, and the reaction pressure was 1.5 MPa.

[0044] The experimental results showed that the recovery rate of m-xylene was 88wt%, and the purity of m-xylene was 99.6 wt%.

Embodiment 2

[0046] According to the method of Example 1, the difference is that the operating temperature is changed to 10°C.

[0047] The experimental results showed that the recovery rate of m-xylene was 83 wt%, and the purity of m-xylene was 99.5 wt%.

Embodiment 3

[0049] According to the method of embodiment 1, difference is that residence time becomes 5min.

[0050] The experimental results showed that the recovery rate of m-xylene was 86 wt %, and the purity of m-xylene was 99.7 wt %.

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Abstract

The invention discloses a process for separation and preparation of high-purity m-xylene from C8 aromatic hydrocarbon. An impinging stream reactor particularly suitable for the process is adopted, fluids are mixed through multiple impinging, good micromixing effect is achieved, the mixed liquid is pushed flatly and flows outside an impinging zone, adequate retention time is provided for the material, a cascade reaction is realized, and the target conversion rate is achieved through design of runners and the liquid flow velocity. The method overcomes the shortcoming that an impinging stream reactor cannot achieve high conversion rate through a single reactor at present, simplifies the technological process, reduces production cost and equipment investment, and ensures long-term operation of equipment. The method has no discharge of waste liquids in the production process, and is a green and environmental-friendly technological method.

Description

technical field [0001] The invention belongs to the technical field of separation and purification of aromatic xylenes, and in particular relates to a method for separating and extracting high-purity m-xylene from C8 aromatics by using a high-efficiency impingement flow reactor. Background technique [0002] At present, the mixed xylenes separated from the toluene disproportionation unit, as well as the C8 aromatics obtained from reformed gasoline, pyrolysis gasoline and coal tar, all contain four isomers, namely o-xylene, p-xylene, meta-xylene Toluene and ethylbenzene. Among the C8 aromatics from these sources, m-xylene has the most content. Since the boiling points of the four C8 aromatics are very close, especially the boiling points of p-xylene and m-xylene are the closest, conventional distillation techniques cannot economically obtain high-purity p-xylene and m-xylene products. At present, the mature adsorption separation process is used in industry to obtain high-pu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J14/00B01J19/26C07C15/08C07C7/14
CPCB01J14/00B01J19/0053B01J19/26B01J2219/00761B01J2219/182C07C7/14C07C15/08
Inventor 张英薄德臣高景山陈建兵高明
Owner CHINA PETROLEUM & CHEM CORP
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