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Segregation and fractionation regeneration method of dimethylformamide as extracting solvent for cracking carbon 5

A technology of dimethylformamide and extraction solvent, which is applied in the field of regeneration of dimethylformamide, an extraction solvent of cracked carbon five fractions, to achieve the effect of easy operation

Active Publication Date: 2009-06-10
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] In order to solve the problem in the prior art that water and dicyclopentadiene are used to azeotropically separate dicyclopentadiene when the extraction solvent dimethylformamide is regenerated, adding water will promote the hydrolysis of dimethylformamide, a method is proposed. A regeneration method capable of avoiding the hydrolysis of extraction solvent dimethylformamide

Method used

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  • Segregation and fractionation regeneration method of dimethylformamide as extracting solvent for cracking carbon 5

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Embodiment 1

[0040] Utilize the regeneration method of the present invention to process the cracked C5 fraction extraction solvent dimethylformamide that needs to be regenerated, and the dimethylformamide that needs to be regenerated mainly consists of the following:

[0041] components Composition, % by weight carbon pentacarbon 0.4 water 0.30 DMF 89.66 Dicyclopentadiene DCPD 5.21 Carbon pentadimer X3 1.89 colloid 2.54

[0042] (1) The extraction solvent dimethylformamide that needs to be regenerated enters the solvent regeneration kettle 1, and the vapor phase stream is extracted from the solvent regeneration kettle 1 top through vacuum distillation, and the liquid stream containing impurities is extracted from the lower end; the temperature of the solvent regeneration kettle 1 is controlled at 90℃, the pressure is controlled at 0.008MPa;

[0043] (2) The rectifying tower 31 of the fractionating column 3 has 50 trays, and the gaseous st...

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Abstract

The invention discloses a method for dephlegmation regeneration of extracting solvent dimethylformamide for cracking C5, and belongs to the technical field of cracking C5 fraction separating method. In order to solve the problem that when solvent is regenerated, water is added to cause acceleration of hydrolysis of dimethylformamide in the prior art, the invention provides a regeneration method for removing C5 hydrocarbon, water, DCPD and colloid by a dephlegmation method, which comprises: a solvent regenerating kettle removes heavy components such as the colloid in the solvent to be regenerated; gas phase materials steamed out enter a decompression dephlegmation tower, and C5 hydrocarbon and water are extracted from gas phase materials flowing out from the top of the tower through condensation of a condenser; and materials flowing out from the solvent regenerating kettle and the bottom of a refining column enter a residue releasing tank, undergo further solvent claim and are discharged. The solvent regeneration method does not have the problems of solvent hydrolysis, tower blockage, etc., and is easy to operate.

Description

technical field [0001] The present invention relates to a kind of regeneration method of cracking C5 fraction extraction solvent dimethylformamide, more specifically, the present invention relates to a kind of regeneration method utilizing the dimethylformamide of fractionating column. Background technique [0002] In the process of producing ethylene from petroleum cracking, a considerable amount of C5 fraction is by-produced, and the C5 fraction is rich in diolefins such as isoprene, cyclopentadiene and piperylene. These diolefins are chemically active and are important chemical raw materials. Due to the difference in cracking raw materials, cracking depth and separation degree of petroleum hydrocarbons, the content of diolefins in cracked C5 fractions is different, and the total content is between 40% and 60%. Therefore, the separation and utilization of C5 fractions has far-reaching significance for improving the economic benefits of ethylene plants and comprehensively ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C233/03C07C231/24C07C11/18C07C13/15C07C13/36C07C7/05
Inventor 杜春鹏田保亮冯海强张齐唐国旗胡競民戴伟
Owner CHINA PETROLEUM & CHEM CORP
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