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Regeneration method of C5 fraction extracting solvent N,N-dimethylformamide

A dimethylformamide and extraction solvent technology, applied in regeneration and extraction solvent N, can solve the problems of easy generation of black slag, block equipment, corrode equipment, etc., to avoid equipment corrosion, complete separation, and reduce the possibility of hydrolysis. Effect

Active Publication Date: 2009-05-20
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] In order to solve the problems of corroded equipment, easy generation of black slag and clogged equipment in the existing DMF regeneration process, and to make up for the deficiencies in the prior art, the present invention proposes a DMF regeneration method without adding water

Method used

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  • Regeneration method of C5 fraction extracting solvent N,N-dimethylformamide

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Embodiment Construction

[0026] Refer below figure 1 The method of the present invention is further explained, but the present invention is not limited thereto.

[0027] The solvent to be regenerated from the tower kettle of the desorption tower is first sent to the regenerated solvent storage tank, and then sent to the light removal tower by a pump. Control the pressure at the top of the stripping tower to 0.02MPa, the temperature at the top of the tower to 99.5°C, and the reflux ratio to 43. Light components such as water and C5 are distilled from the top of the tower, and the liquid in the bottom of the tower is sent to the solvent refining tower after being cooled. Control the top pressure of the solvent refining tower to 0.01MPa (absolute), the top temperature to 83.5°C, and the reflux ratio to 1.6. DMF with a purity of more than 99% is evaporated from the top of the solvent refining tower, and sent to the extractive distillation tower for recycling. The bottom liquid of the tower is DMF materi...

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Abstract

The invention provides a regeneration method of a C5 fraction extractive solvent-N, N-dimethyl formamide, and an application thereof. The method includes that a regenerated solvent DMF from a resolution column vessel enters a lightness-removing column, and materials in the column vessel are introduced into a solvent refining column; DMF with the purity of more than 99 percent is obtained at the top of the column; heavy components containing dicyclopentadiene, colloid, DMF and the like are drawn out of the column vessel; the materials are sent to a solvent reclaiming tower for reclaiming the DMF in the materials, and then recycled to the solvent refining column; and materials containing colloid and dicyclopentadiene obtained from the solvent reclaiming tower are delivered out of a battery limit. No addition of water is required in the regeneration process of solvents in the method, thus avoiding the problems of equipment corrosion, easy generation of black slag, equipment plugging and the like caused by DMF hydrolysis greatly.

Description

technical field [0001] The present invention relates to a kind of extraction solvent N that is used for the separation of C5 fraction, the recovery, regeneration, refining method of N-dimethylformamide (hereinafter referred to as DMF), more specifically, the present invention relates to a kind of C5 fraction separation The extraction solvent N,N-dimethylformamide extracts and resolves and regenerates without adding water. Background technique [0002] C5 fraction is an important co-product of ethylene production plant, among which isoprene, cyclopentadiene and piperylene are all important raw materials of organic chemical industry and fine chemical industry. However, the boiling points of the components in the C5 fraction are very similar, and it is difficult to directly separate them by ordinary rectification methods. According to the relative volatilities of the C5 components in DMF, high-purity isoprene, piperylene, and dicyclopentadiene can be obtained by extraction, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C233/03C07C231/24C07C13/61
Inventor 程建民杜春鹏过良刘智信李东风
Owner CHINA PETROLEUM & CHEM CORP
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