Method for chemically removing trace cyclopentadiene from piperylene

A technology for cyclopentadiene and piperylene, which is applied in the field of chemically removing trace cyclopentadiene in piperylene, can solve the problem of complicated filtering and precipitation process, affecting material transfer, and generation of waste residue and waste liquid. It can solve the problems of large amount and other problems, so as to achieve the effect of simple distillation and purification process, less environmental pollution and simple process.

Active Publication Date: 2018-03-27
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the purification method has the following problems that have not yet been resolved: 1. In the process, crude piperylene is added in a certain proportion to butanone, ethanol, potassium hydroxide and soaked for 3-4 days and nights, after hydrocarbons need to be poured out from the precipitation part For rectification, precipitation is formed in the process, and the process of filtering out the precipitation is complicated, and the complete separation of liquid and solid cannot be achieved, which affects the transfer of materials
2. The reagents used in this process can only be used once and cannot be reused, and the amount of stripping agent and catalyst is large, the distillation purification process is complicated and energy-consuming, and the waste residue and waste liquid are generated in a large amount

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] At room temperature, add 20 g of n-butanol to 4 g of potassium hydroxide and stir for 5 minutes to obtain solution A.

[0025] 34 g of piperylene and 45 g of cyclohexanone were added to the solution A and stirred for 72 hours to obtain a mixed solution B1. At 75°C, the solution B1 was subjected to atmospheric distillation to obtain 30 g of the effluent C1 and the distillate D1 in the bottle. The cyclopentadiene content in the effluent C was analyzed by chromatography to be below 10 ppm.

[0026] Add 30 g of piperylene to the distillate D1 in the bottle and stir for 98 hours to obtain a mixed solution B2. At 75° C., solution B2 was subjected to atmospheric distillation to obtain 29 g of effluent C2 and bottle distillate D2. The cyclopentadiene content in effluent C2 was analyzed by chromatography to be below 10 ppm.

[0027] Add 29 g of piperylene to the distillate D2 in the bottle and stir for 72 hours to obtain a mixed solution B3. At 75° C., solution B3 was subjected to at...

Embodiment 2

[0029] At room temperature, 80 g of n-butanol was added to 4 g of potassium hydroxide and stirred for 5 minutes to obtain solution A.

[0030] 34 g of piperylene and 90 g of cyclohexanone were added to the solution A and stirred for 72 hours to obtain a mixed solution B. At 60° C., solution B was subjected to atmospheric distillation to obtain 29 g of effluent C1 and bottle distillate D. The content of cyclopentadiene in effluent C was analyzed by chromatography to be below 10 ppm.

Embodiment 3

[0032] At room temperature, 80 g of n-butanol was added to 4 g of potassium hydroxide and stirred for 5 minutes to obtain solution A.

[0033] 34 g of piperylene and 75 g of cyclohexanone were added to solution A and stirred for 72 hours to obtain mixed solution B. At 70°C, the solution B was subjected to atmospheric distillation to obtain 30 g of the effluent C1 and the distillate D in the bottle. The content of cyclopentadiene in the effluent C was analyzed by chromatography to be below 10 ppm.

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PUM

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Abstract

The invention provides a method for chemically removing trace cyclopentadiene from piperylene. Trace cyclopentadiene refers to that the mass content of cyclopentadiene in piperylene is less than or equal to 1%. The method comprises the following steps: (1) adding n-butanol into potassium hydroxide at room temperature and carrying out stirring until potassium hydroxide is completely dissolved so asto obtain a solution A; (2) adding piperylene and cyclohexanone into the solution A at room temperature and carrying out stirring to obtain a mixed solution B; (3) subjecting the solution B to atmospheric distillation to obtain an effluent C and an in-bottle distillate D, wherein the effluent C is refined piperylene in which the content of cyclopentadiene may drop to 10 ppm or less; and (4) cyclically using the distillate D, and adding piperylene into the distillate D to realize reuse of the distillate D for removal of trace cyclopentadiene from piperylene, wherein in the step (1), the mass ratio of n-butanol to potassium hydroxide is 5-20: 1.

Description

Technical field [0001] The method of the invention belongs to the field of piperylene refining, and specifically relates to a method for chemically removing trace cyclopentadiene in piperylene. Background technique [0002] The comprehensive utilization of petroleum cracking C5 fraction resources has increasingly become one of the important technologies in the chemical industry. Among the cracking C5 fractions, the most valuable and most valuable diolefins are isoprene, piperylene and cyclopentadiene. Among them, the value of piperylene is particularly outstanding, and it can be used in the preparation of synthetic resins and catalysts. [0003] Separating piperylene from C5 feedstock, due to the small boiling difference and the existence of azeotrope, in addition to alkynes, the removal of cyclopentadiene from piperylene is very difficult, and it is difficult to pass the process of industrial rectification. The complete removal of cyclopentadiene will also result in a large reflu...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C7/04C07C11/20
CPCC07C7/005C07C7/04C07C11/20
Inventor 孙福权陈加平韩明哲李科录王先武赵宇徐刚宋玉萍仝璐杨欢贾芳成史小松杨亮詹续芹黄春艳李文强康剑铭
Owner PETROCHINA CO LTD
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