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Method for producing n-butene from isobutene

A technology for isobutene and n-butene, which is applied in chemical instruments and methods, isomerization hydrocarbon production, and hydrocarbon purification/separation, etc., which can solve the problem that the concentration of isobutene cannot be met, the yield of n-butene is low, and it cannot be alkylated. Use of chemical raw materials, etc.

Active Publication Date: 2021-03-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Although the above-mentioned method can convert part of isobutene into normal butene, the normal butene yield is low, and there is still a large amount of unreacted isobutene in the product, which cannot meet the limitation of the alkylation raw material to the isobutene concentration (requiring the isobutene concentration to be lower than 2 %), cannot be directly used as alkylation feedstock

Method used

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  • Method for producing n-butene from isobutene
  • Method for producing n-butene from isobutene

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Embodiment approach

[0032] The inventive method also can have another kind of implementation method: (2) step described methyl tertiary butyl ether is the mixture that adds methyl tertiary butyl ether and (1) step gained methyl tertiary butyl ether, (3) The isobutene described in the step is a mixture of isobutene and (2) step gained isobutene. In this case, the raw materials of the inventive method are C4 hydrocarbons, methyl tert-butyl ether and isobutene containing isobutene, and the C4 hydrocarbons containing isobutene are The mass ratio of the hydrocarbon, the added methyl tert-butyl ether, and the added isobutylene is 1:0.1-10:0.1-10.

[0033] The added methyl tert-butyl ether in the present invention comes from the etherification unit of the isobutane-propylene co-oxidation unit or other etherification units, and the added isobutene comes from high-purity isobutene obtained after dehydration and refining of tert-butanol.

[0034] The catalyst used for the isobutene normalization reaction i...

example 1

[0058] The normalization catalyst described in the present invention is prepared.

[0059] (1) Preparation of preform

[0060] Take SiO 2 / Al 2 o 3 Mole ratio is 90.0g of HZSM-35 molecular sieve and 5.0g white carbon black, 20.0g alkaline silica sol (SiO in silica sol 2 Content is 30% by mass, Na 2 O content is 0.4 mass %), the NaOH of 0.5g and 30.0g deionized water are mixed uniformly, and its molar composition is 0.041Na 2 O: 8.0ZSM-35 molecular sieve: SiO 2 : 15.1H 2 O, the number of moles of the ZSM-35 molecular sieve is calculated by SiO contained therein 2 The number of moles (the same below). The mixture was kneaded evenly, extruded into strands, and dried at 120°C for 10 hours to obtain a preform. The specific surface area of ​​the ZSM-35 molecular sieve measured by the BET method is 298m2 / g, the micropore specific surface area is 280m 2 / g, the pore volume is 0.202ml / g, and the micropore volume is 0.130ml / g.

[0061] (2) Preparation of composite carrier

...

example 2

[0066] Catalyst is prepared by the method of example 1, difference is the SiO of ZSM-35 molecular sieve used 2 / Al 2 o 3 Molar ratio is 52, and (3) step is that the nickel chloride of 0.5gNi / ml replaces palladium chloride with 20ml concentration, makes catalyst B, wherein the Ni content calculated on the basis of composite carrier is 0.05 mass %, Na 2 The O content is 0.02% by mass, and the composite carrier is composed of 89.1% by mass of ZSM-35 molecular sieve and 10.9% by mass of all-silicon ZSM-35 molecular sieve.

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Abstract

The invention relates to a method for producing n-butene from isobutene, which comprises the following steps of: (1) feeding mixed C4 hydrocarbon containing isobutene into an etherification reactor for pre-etherification to enable most isobutene in the C4 hydrocarbon raw material to react with methanol to generate methyl tert-butyl ether, feeding a pre-etherification product into a catalytic distillation tower to enable unreacted isobutene to be completely etherified, and rectifying to separate an etherification product so as to obtain methyl tert-butyl ether and a C4 hydrocarbon product without isobutene; (2) cracking the methyl tert-butyl ether to generate isobutene and methanol; and (3) feeding the isobutene obtained by cracking into a normalizing unit, performing normalizing reaction under the conditions of 280-480 DEG C and 0.05-1.0 MPa, removing C5<+> heavy components from the normalizing reaction product, and returning the normalizing reaction product and the methanol obtained in the step (2) to the etherification reactor in the step (1). According to the method, isobutene in the raw materials can be converted into a C4 product which is rich in n-butene and hardly contain isobutene, and an effective way is provided for utilization of isobutene and MTBE.

Description

technical field [0001] The invention is a method for normalizing isomeric olefins, specifically, a method for producing n-butene from isobutene. Background technique [0002] Isobutene is a by-product of petroleum refining and petrochemical process, catalytic cracking by-product C 4 The components usually contain 15-18 mass% isobutene, the by-product raffinate of ethylene cracking unit C 4 The isobutylene content in the component is as high as about 40% by mass. Although isobutylene is a raw material for the preparation of butyl rubber, polyisobutylene, methacrylonitrile, antioxidants, tert-butylphenol and other chemical products, its usage is limited. At present, it is mainly used for blending with methanol etherification to produce high-octane gasoline. Sub-methyl tert-butyl ether (MTBE). [0003] Bioenergy represented by biofuel ethanol is a national strategic emerging industry. Due to the limitation of oxygen content in gasoline standards, after the promotion of ethan...

Claims

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Application Information

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IPC IPC(8): C07C5/27C07C11/08
CPCC07C5/2775C07C7/14891C07C11/08C07C11/09Y02P20/10
Inventor 刘洪全于中伟马爱增孙义兰王子健
Owner CHINA PETROLEUM & CHEM CORP
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