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Separation method for refining coarse piperyene

A separation method and technology for piperylene are applied in the field of refining and separation of crude piperylene, which can solve the problems of no use value, failure to be recycled, and low purity, reduce waste liquid discharge, and be beneficial to environmental protection. , Improve the effect of refining yield

Active Publication Date: 2006-07-05
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These by-products still contain a certain amount of piperylene, but because the purity is very low, there is almost no utilization value. In addition, cyclopentene and cyclopentane, which are of great application value in the by-products, are also discarded and cannot be recycled.

Method used

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  • Separation method for refining coarse piperyene
  • Separation method for refining coarse piperyene
  • Separation method for refining coarse piperyene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7

[0029] The crude piperylene whose composition is shown in Table 1 is preheated to 30-40° C. and then enters an extractive distillation column for extractive distillation. The extractive distillation column is a packed column with 45 theoretical plates. Crude piperylene enters the extractive distillation column from the 32nd tray at a flow rate of 400g / h, and the extractant is fed from the 4th tray. The extraction and rectification towers of each embodiment are operated under normal pressure. The specific extraction agent used, the feed weight ratio of piperylene to the extraction agent, and the temperature of the tower bottom and tower top are shown in Table 2. The main composition of the material discharged from the top of the extractive distillation tower in each embodiment is shown in Table 3.

[0030] The extractive distillation tower bottom material enters a rectification tower subsequently to carry out rectification, and the rectification tower is a packed tower, and the...

Embodiment 8～11

[0037] The tower top material obtained in Step 1 of Example 1 (the composition is shown in Table 3) is mixed with hydrogen and enters a fixed-bed catalytic hydrogenation reactor for hydrogenation reaction to obtain cyclopentane. The catalyst adopts Pd / γ-Al 2 o 3 (The content of Pd in ​​the catalyst is 0.5wt%, the catalyst is spherical, and the particle size is 2-4mm). See Table 6 for the process conditions used in each embodiment and the hydrogenation conversion rate of cyclopentene.

[0038] volume feed ratio

[0039] Note: The volume feed ratio is: hydrogen / overhead material

Embodiment 9

[0041] The hydrogenated product obtained in Example 9 (with a cyclopentane content of 72 wt%) was preheated to 40° C. and then entered a rectification tower for rectification. The rectification tower was a packed tower with 35 theoretical plates. The hydrogenation product enters the rectification tower from the 14th tray at a flow rate of 100g / h, the light component material is distilled from the top of the tower, and the refined product of cyclopentane is obtained in the bottom of the tower. The rectifying towers of each embodiment are operated under normal pressure, and other process conditions and cyclopentane product purity are shown in Table 7.

[0042] Top temperature

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Abstract

This is a process for the refinery and separation of crude m-pentadiene, which is obtained through the separation of the by-product C5 fraction of ethane manufacturing via petroleum pyrolysis, including the steps of: 1) directing the crude m-pentadiene into an extractive rectification column for extractive rectification, and collecting an overhead product of a mixed stream substantially enriched in cyclopentene and cyclopententane, and a bottom product of a mixed stream substantially enriched in m-pentadiene and the extractant, which is dimethyl formamide, N-methyl pyrrolidone, ethyl hydrazine or an aqueous solution of ethyl hydrazine containing 5-15 wt.% water; 2) directing the said bottom stream into a refinery column for refinery, and colleting an overhead product of the refined m-pentadiene, and a bottom product of the extractant, which is recovered and recycled; 3) subjecting the process 1 wherein said overhead stream to a hydrogenation reaction, and obtaining the hydrogenation product containing cyclopententane; and 4) removing the light components whose boiling point is lower than that of cyclopententane from the hydrogenation product, and obtaining the refinery product of cyclopententane. This invention ensures a high recovery and refinery rate to obtain refined m-pentadiene product with purity higher than 95%, and also obtains a byproduct of cyclopententane.

Description

technical field [0001] The present invention relates to a method for refining and separating crude piperylene, in particular to a method for obtaining refined piperylene by extracting and rectifying separation of crude piperylene obtained by separating the by-product C5 fraction from petroleum cracking to produce ethylene . Background technique [0002] In the process of producing ethylene from petroleum cracking, a considerable amount of C5 fraction is produced by-product, and the C5 fraction is rich in diolefins such as piperylene, isoprene and cyclopentadiene. These diolefins are active in chemical properties and are important resources for chemical utilization. The main components in the mixed carbon five enriched in piperylene (hereinafter referred to as crude piperylene) obtained by the separation process of carbon five are piperylene, cyclopentene and cyclopentane, of which piperylene The content is about 65-75 wt%, and the total content of cyclopentene and cyclopen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/20C07C7/08
Inventor 傅建松王雅辉张冬梅吴忠平黄勇
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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