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Method for removing 2-butyne by conducting selective hydrogenation on C5 fractions

A C5 fraction, selective technology, used in hydrocarbons, chemical instruments and methods, hydrocarbon purification/separation, etc., can solve the problem of reducing isoprene yield, increasing energy consumption, and improving operational severity problems, to achieve the effect of preventing polymerization side reactions, reducing energy consumption, and reducing the severity of operations

Inactive Publication Date: 2017-04-26
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the main impurity in the polymer grade isoprene is three kinds of 2-butyne, isopentenyne and cyclopentadiene, the 2-butyne content in the raw material will be improved by recycling carbon five cuts, if to meet The requirement of 2-butyne content in polymer grade isoprene products ≤ 8mg / kg will inevitably increase the operating severity and increase energy consumption; and if the carbon five fraction is separated from the device as a by-product, the isoprene The yield of diene is reduced by 3-6%

Method used

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  • Method for removing 2-butyne by conducting selective hydrogenation on C5 fractions
  • Method for removing 2-butyne by conducting selective hydrogenation on C5 fractions
  • Method for removing 2-butyne by conducting selective hydrogenation on C5 fractions

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Embodiment 1～10

[0023] 1. Raw material of C5 distillate

[0024] The C5 fractions used in Examples 1 to 10 come from a part of the material produced by the C5 separation device when producing isoprene. The components of the C5 fraction are shown in Table 1.

[0025] Table 1.

[0026] components C5 fraction Total C4,% 0.00 3-Methylbutene-1,% 0.01 1.4-Pentadiene,% 0.07

[0027] 2-Butyne,% 1.17 Prenyne,% 0.00 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 11

[0028] 2. Dimethylamine removal of C5 fraction

[0029] The size of the water washing tower for removing dimethylamine from the carbon five fraction is It is carried out in a stainless steel tube, and 100 grams of spherical sulfonic acid-based cation exchange resin catalysts with a particle size of 0.40-1.25 mm are loaded into the tube ...

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Abstract

The invention belongs to the technical field of organic chemical industry, and particularly relates to a method for removing 2-butyne by conducting selective hydrogenation on C5 fractions. The method particularly comprises the following steps of 1 denitrification, wherein denitrification treatment is conducted on the C5 fractions through a fixed bed containing sulfonic group cation exchange resin and water; 2 selective hydrogenation, wherein selective hydrogenation is conducted on the C5 fractions obtained after denitrification through a bubbling bed reactor containing a Pd-Ni-Ag-M / Al2O3 catalyst, and then 2-butyne is converted into butane. The method has the advantages that the processes are simple, no wastewater is drained, the denitrification precision is high, no material is lost, and polymerization side reactions can be effectively inhibited.

Description

technical field [0001] The invention belongs to the technical field of organic chemical industry, and in particular relates to a method for selectively hydrogenating a C5 fraction to remove 2-butyne:. 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 chemical products with higher added value after downstream processing. [0003] In the process of producing isoprene in the C5 separation device, two extraction and rectification processes using N,N-dimethylformamide (hereinafter referred to as DMF) as the extraction agent are usually used to refine isoprene, extract The function of the agent is to change the relative volatility o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/18C07C7/167C07C7/12
CPCC07C7/005C07C7/12C07C7/167C07C11/18
Inventor 夏蓉晖方玲瞿卫国陆鑫孙骏常慧王禾曹强叶军明徐泽辉
Owner CHINA PETROLEUM & CHEM CORP
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