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Method for removing alkynes from C5 fraction

A technology for C5 fractions and medium alkynes, which is applied in the field of removing alkynes in C5 fractions, can solve the problems of increased operating costs and energy consumption, high loss of isoprene, low alkyne content, and the like, and achieves reduced operating costs. Severity, product quality improvement, effect of reducing prenyne and 2-butyne content

Inactive Publication Date: 2017-04-26
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] From the point of view of the prior art, the disclosed method of CN1412165A and CN1410515A can effectively remove the alkynes in the C5 cut, save the second section of extraction and rectification, and simplify the technical process. 5. After the raw material pretreatment and before the isoprene extraction and rectification unit, the content of alkynes is low, the operation of selective hydrogenation is difficult, the loss of isoprene is large, and the corresponding operating costs and energy consumption will increase accordingly

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  • Method for removing alkynes from C5 fraction
  • Method for removing alkynes from C5 fraction
  • Method for removing alkynes from C5 fraction

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Embodiment 1～10

[0022] 1. Raw material of C5 distillate

[0023] The C5 fractions used in Examples 1-10 come from the C5 separation device and are in the isoprene production unit. The components of the C5 fraction are shown in Table 1.

[0024] Table 1. Components of the C5 fraction

[0025] components C5 fraction Total C4,% 0.02 3-Methylbutene-1,% 0.01 1.4-Pentadiene,% 0.02 2-Butyne,% 1.17 Prenyne,% 1.91 2-Methylbutene-1,% 0.02 Isoprene,% 98.23 2-Methylbutene-2,% 0.00 Cyclopentadiene,% 0.00 Cyclopentene,% 0.00 Other C5,% 0.00 Dimethylamine,% 0.5 pH 10

[0026] 2. Selective hydrogenation of C5 fraction

[0027] The selective hydrogenation of the C5 fraction is carried out in a stainless steel tubular bubbling bed reactor with a size of φ25mm×1500mm. 100ml of selective hydrogenation catalyst (HTC NI 400RPS 2.5mm) packed in the reactor. The catalyst was produced by Johnson Matthey Catalyst Company. ...

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Abstract

The invention belongs to the technical field of organic chemical engineering, and concretely relates to a method for removing alkynes from a C5 fraction. The method comprises the following steps: carrying out a selective hydrogenation reaction on a C5 fraction containing 2-butyne and pentone, obtained after an extraction and rectification process, by adopting a partially vulcanized Ni series catalyst, selectively hydrogenating the C5 fraction through a selective hydrogenation bubble column reactor to convert 2-butyne in the C5 fraction into 2-butylene, convert pentone into isoprene and effectively reduce the content of the alkynes to 15 mg / kg or less. The method allows the alkynes in the C5 fraction to be afresh used, and the hydrogenated C5 fraction and the C5 raw material are mixed to form an isoprene production raw material, so the isoprene yield and the isoprene quality are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of organic chemical industry, and in particular relates to a method for removing alkynes in C5 fractions, which meets the production requirements of polymer-grade isoprene. Background technique [0002] In the process of producing ethylene by steam cracking of naphtha, a considerable amount of carbon five fractions are by-produced, and the carbon five fractions can be separated to produce piperylene, isoprene and dicyclopentadiene products, these three diolefins Due to its special molecular structure and active chemical properties, it can be transformed into a series of high value-added chemical products after downstream processing. [0003] Isoprene is the main raw material for synthetic rubber. In order to prevent catalyst poisoning during the polymerization of isoprene, it is required that the total content of alkynes in the polymerization grade isoprene product be ≤50mg / kg. In the C5 separation device, ...

Claims

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Application Information

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IPC IPC(8): C07C11/18C07C7/167
Inventor 常慧曹强叶军明陆鑫孙骏方玲瞿卫国王禾夏蓉晖徐泽辉
Owner CHINA PETROLEUM & CHEM CORP
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