Method for decolorizing solvent oil and extracting durene

A technology of mesitylene and solvent oil, used in chemical instruments and methods, purification/separation of hydrocarbons, organic chemistry, etc.

Pending Publication Date: 2020-07-07
NORTH HUAJIN CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention proposes a method for decolorizing solvent oil and extracting dur...

Method used

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  • Method for decolorizing solvent oil and extracting durene

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The solvent oil raw material enters the durene fractionation tower, the mass fraction of the solvent oil raw material durene is 12%, the pressure of the fractionation tower is a negative pressure of 30KPa, the temperature of the tower top is 120°C, the temperature of the side stream is 140°C, and the temperature of the tower bottom is 160°C ℃. Solvent oil SA1800 is obtained at the top of the tower, and the durene enriched liquid with a mass fraction of 45% is obtained from the side line extraction. The durene enriched liquid is passed into a heat exchanger, and high-pressure hot water is used to condense the durene. The tetramethylbenzene enrichment liquid is sent to a multi-stage melting crystallizer for crystallization.

[0032] The melting crystallizer is cooled to 70°C at 4°C / h, the uncrystallized mother liquor is discharged, and the crystal is sweated. The sweating temperature is 77°C, and the constant temperature is sweated for 0.5h. The product tank obtains dure...

Embodiment 2

[0035] The solvent oil raw material enters the durene fractionation tower, the mass fraction of the solvent oil raw material durene is 14%, the pressure of the fractionation tower is a negative pressure of 30KPa, the temperature of the side stream is 120°C, the temperature of the tower top is 140°C, and the temperature of the tower bottom is 160°C ℃. Solvent oil SA1800 is obtained at the top of the tower, and the durene enriched liquid with a mass fraction of 48% is obtained from the side line extraction. The durene enriched liquid is passed into a heat exchanger, and high-pressure hot water is used to condense durene. The tetramethylbenzene enrichment liquid is sent to a multi-stage melting crystallizer for crystallization.

[0036] The melting crystallizer cools down to 72°C at 3°C / h, discharges the uncrystallized mother liquor, sweats the crystal, the sweating temperature is 78°C, sweats at a constant temperature for 1 hour, discharges the sweating mother liquor, heats the ...

Embodiment 3

[0039] The solvent oil raw material enters the durene fractionation tower, the mass fraction of the solvent oil raw material durene is 12%, the pressure of the fractionation tower is a negative pressure of 50KPa, the temperature of the side stream is 170°C, the temperature of the tower top is 150°C, and the temperature of the tower bottom is 200 ℃. Solvent oil SA1800 is obtained at the top of the tower, and the durene enriched liquid with a mass fraction of 50% is obtained from the side line extraction. The durene enriched liquid is passed into a heat exchanger, and high-pressure hot water is used to condense durene. The tetramethylbenzene enrichment liquid is sent to a multi-stage melting crystallizer for crystallization.

[0040] The melting crystallizer cools down to 73°C at 2°C / h, discharges the uncrystallized mother liquor, sweats the crystal, the sweating temperature is 78.5°C, sweats at a constant temperature for 1 hour, discharges the sweating mother liquor, heats the ...

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Abstract

The invention provides a method for decolorizing solvent oil and extracting durene, which comprises the following steps of feeding a solvent oil raw material into a durene fractionating tower, extracting durene enrichment liquid from a side line, feeding the durene enrichment liquid into a multi-stage melting crystallizer for melting crystallization after passing through a heat exchanger, and refining to obtain durene, fractionating at the top of a durene fractionating tower to obtain solvent oil SA1800, sending the tower bottom liquid of the durene fractionating tower into a decolorizing tower, separating from the top of the decolorizing tower to obtain solvent oil SA2000, and sending the tower bottom residual liquid of the decolorizing tower into a coking system. According to the method,continuous rectification and melting crystallization are coupled, durene is purified from the solvent oil, the solvent oil is decolorized, heavy aromatics are further deeply processed from the solvent oil stage, and economic benefits are improved. The method is simple to operate, high in safety, low in energy consumption and high in industrial feasibility.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a method for decolorizing solvent oil and extracting durene. Background technique [0002] Durene is a scarce fine chemical raw material, and it is the only tetramethylbenzene with industrial use among polytoluenes. Due to its active methyl group, high selectivity and high reaction speed, it has been paid more and more attention in industry. The structure of durene makes it have a higher melting point compared with para-tetramethylene and partial tetramethylene, so one use of durene and its derivatives is to increase the crystallinity of polymers. For example, the glass transition temperature of polyamine prepared from durene and sebacic acid is 400°C higher than that of polyamine prepared from 1,4-phenylenediamine; in addition, durene can also be used to produce Pyromellitic dianhydride PMDA is further processed into a new type of high temperature resist...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C7/04C07C7/14C07C15/02
CPCC07C7/005C07C7/04C07C7/14C07C15/02
Inventor 魏丽娟李永华王益波李耀波张东梅刘万胜范铁军付莹
Owner NORTH HUAJIN CHEM IND CO LTD
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