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Refining separation method for coarse piperyene

A separation method and technology of pentadiene, which is applied in the field of purification and separation of crude piperylene, can solve the problems of no use value, failure to be recycled, and low purity, so as to reduce waste liquid discharge, benefit environmental protection, The effect of improving the 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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  • Refining separation method for coarse piperyene
  • Refining separation method for coarse piperyene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7

[0026] 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.

[0027] 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

[0029] The tower top material (composition sees Table 3) obtained by embodiment 1 step 1 enters a rectifying tower and carries out rectifying, and the rectifying tower is a packed tower, and the number of theoretical plates is 50, and feed opening is positioned at the 28th plate, The rectifying towers of each embodiment are operated under normal pressure, and the distillation rate D / F is controlled to be 0.60. Other process conditions are shown in Table 6. The cyclopentene product is obtained at the top of the tower, and the cyclopentane product is obtained at the bottom of the tower. The purity of the cyclopentene and cyclopentane products obtained in each embodiment is shown in Table 7 with the product yield.

[0030]

[0031] Note: DMF is dimethylformamide; the water content of acetonitrile aqueous solution is 10wt%.

[0032] Cyclopentene

[0033] Tower kettle temperature

[0034] Purity of Piperylene Refined Products

[0035]...

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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) directing the process 1 wherein said overhead stream into a refinery column for refinery, and collecting an overhead product of cyclopentene, and a bottom product of cyclopententane. This invention ensures a high recovery and refinery rate to obtain refined m-pentadiene product with a purity higher than 95%, and also obtains a mixture of cyclopentene and cyclopententane with a high utility value.

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蒋方红
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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