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Refined mixed aromatic narrow fraction separation method and device

A technology for mixing aromatic hydrocarbons and rectifying separation, which is applied in distillation purification/separation, hydrocarbon purification/separation, chemical instruments and methods, etc. The effect of lower production costs and greater operational flexibility

Active Publication Date: 2018-02-09
新疆寰球工程公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a method and device for separating narrow fractions of refined mixed aromatics, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem of using the prior art to further separate refined mixed aromatics to obtain multi-brand solvent oils, which will lead to production Increase in the number of equipment, investment, energy consumption, etc.

Method used

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  • Refined mixed aromatic narrow fraction separation method and device
  • Refined mixed aromatic narrow fraction separation method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1, as attached figure 2As shown, the method for refining the narrow fraction separation of mixed aromatics is carried out according to the following steps: the first step, a narrow fraction separation tower 2 is connected after the mixed aromatics separation tower 1; the second step, the refined mixed aromatics enters the mixed aromatics Carry out rectification separation of mixed xylenes, mixed trimethylbenzenes, mixed tetramethylbenzenes and oil slurry in the separation tower 1, after rectification separation, discharge the mixed xylenes from the top of the mixed aromatics separation tower 1, and discharge the mixed xylenes from the bottom of the mixed aromatics separation tower 1 The oil slurry is discharged, and the mixed trimethylbenzenes and mixed tetramethylbenzenes are respectively discharged from the side line of the mixed aromatics separation tower 1; in the third step, when the mixed trimethylbenzenes need to be further separated, the mixed trimeth...

Embodiment 2

[0026] Embodiment 2, as the optimization of above-mentioned embodiment, according to needs, narrow fraction separation tower 2 is conventional plate rectification tower, and 60 trays are arranged in conventional plate rectification tower, in conventional plate rectification tower, from bottom to bottom And the position of the 40th tray on the top is the side draw position of 1# narrow cut and 3# narrow cut.

Embodiment 3

[0027] Example 3, as an optimization of Example 1, as needed, in the first step, the top temperature of the mixed aromatics separation tower 1 is 145°C to 185°C, the top pressure is 0.08MPa to 0.1MPa, and the bottom temperature is 214 °C to 254 °C, the pressure at the bottom of the tower is 0.11MPa to 0.13MPa, and the reflux ratio is 3 to 7.

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Abstract

The invention relates to the technical field of refined mixed aromatic separation, in particular to a refined mixed aromatic narrow fraction separation method and device. The method comprises the following steps that 1, a narrow fraction separation tower is sequentially connected behind a mixed aromatic separation tower; 2, refined mixed aromatics enter the mixed aromatic separation tower; mixed xylene, mixed trimethylbenzene, mixed tetramethylbenzene and oil slurry are subjected to rectification separation; after the rectification separation, mixed xylene is discharged out from the top of themixed aromatic separation tower. On the basis of the improved existing plate type rectification tower, a narrow fraction separation tower applicable to the method and the device is obtained; No.1 narrow fractions, No.2 narrow fractions, No.3 narrow fractions and No.4 narrow fractions with narrow distillation range width can be obtained by one narrow fraction separation tower; the investment quantity of production device equipment is small; the use quantity of energy is also correspondingly reduced; the production cost is effectively reduced; the operation flexibility is high; the narrow fractions are clearly cut; the precision is high.

Description

technical field [0001] The invention relates to the technical field of separation of refined mixed aromatics, and relates to a method and device for separating narrow fractions of refined mixed aromatics. Background technique [0002] China's ethylene industry has entered a period of rapid development. In recent years, the commissioning and expansion of several sets of ethylene plants has greatly increased the ethylene production capacity. Very low, most of the pyrolysis fuel oil is used as fuel and has not been comprehensively utilized with higher value. The potential of mixed aromatic products in pyrolysis fuel oil is very large. [0003] The Chinese patent literature with the publication number CN103102976A discloses a method for fractionating ethylene tar into light fraction and heavy fraction. The heavy fraction is mixed with conventional coking raw materials, and coked gasoline, coked diesel oil, and coked wax oil are obtained through delayed coking. The resulting cok...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/08C07C15/02C07C7/04
CPCC07C7/005C07C7/04C07C15/08C07C15/02
Inventor 郭俊玲吴新君郝莉莉吴桐魏芳曹志强李霞
Owner 新疆寰球工程公司
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