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Step-by-step condensation regeneration method of cracking carbon five extraction solvent dimethylformamide

A technology of dimethylformamide and extraction solvent, which is applied in the field of regeneration of dimethylformamide, the extraction solvent of cracked C5 fraction, to achieve the effect of easy operation

Active Publication Date: 2011-11-30
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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  • Step-by-step condensation regeneration method of cracking carbon five extraction solvent dimethylformamide
  • Step-by-step condensation regeneration method of cracking carbon five extraction solvent dimethylformamide

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Embodiment 1

[0039] 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:

[0040] components Composition, % by weight carbon pentacarbon 0.4 water 0.30 DMF 89.66

[0041] 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 solvent refining tower has 50 trays in total, and t...

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Abstract

The invention discloses a step-by-step condensation regeneration method for cracking C5 extraction solvent dimethylformamide, which belongs to the technical field of cracking C5 fraction separation methods, in order to solve the problem in the prior art that adding water during solvent regeneration will promote dimethyl formamide For the problem of hydrolysis of formamide, a regeneration method was proposed to remove carbon pentahydrocarbons, water, DCPD and colloids by means of rectification and step-by-step condensation. Solvent regeneration tank was used to separate heavy components such as colloids in the solvent to be regenerated, and distilled The gaseous phase flow that goes out enters the rectification under vacuum tower, and the gaseous phase flow that flows out from the top of the tower first passes through the first condenser or the condensing fractionator to condense the dimethylformamide that is carried, and then in the second condenser, the carbon five Hydrocarbons and water are condensed and produced, and the outflow from the solvent regeneration tank and the refining tower tank enters the residue release tank, and is discharged after further solvent recovery. The solvent regeneration method of the present invention has no problems such as solvent hydrolysis and tower blockage, 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 sub-step condensation. 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 Patents(China)
IPC IPC(8): C07C231/24C07C233/03C07C4/22
Inventor 杜春鹏田保亮冯海强唐国旗张齐胡競民戴伟
Owner CHINA PETROLEUM & CHEM CORP
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