Method for producing diisobutylene using mixed c4 fraction as raw material

A technology of diisobutene and manufacturing method, applied in the direction of organic chemical method, distillation purification/separation, chemical instrument and method, etc., can solve the problem of low conversion rate, etc., and achieve the effect of high reaction selectivity

Active Publication Date: 2014-03-05
IDEMITSU KOSAN CO LTD
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Problems solved by technology

In this technology, high-purity diisobutene can be obtained from a C4 mixed fraction as a raw material, but only the result of a low conversion rate of isobutene is disclosed, and the oligomerization catalyst is a completely different catalyst from the silica-alumina catalyst

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  • Method for producing diisobutylene using mixed c4 fraction as raw material

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Embodiment 1~3 and comparative example 1

[0073] Diene components such as butadiene in the mixed C4 fraction obtained by cracking naphtha are extracted with dimethylformaldehyde, and then selectively hydrogenated with a commercially available Pd catalyst to make the diene concentration 10% by mass. below ppm. Next, the S component and the N component were removed by water washing to 5 mass ppm or less. Further, the C3 components are removed from the top of the column by continuous distillation, thereby producing a raw material for producing diisobutene. (Raw material composition in Table 1).

[0074] As a polymerization catalyst, the silica-alumina catalyst [SiO 2 / Al 2 o 3 Mass ratio: 9, average pore diameter: 6nm, total pore volume: 0.5mL / g, BET specific surface area: 400m 2 / g] was filled into a tubular reactor to implement a fixed-bed continuous reaction. The reactor is heated with a mantle heater and the catalytic bed is controlled to be isothermal. The reaction conditions and reaction results are shown in...

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Abstract

A method for producing diisobutylene by bringing a raw mixed C4 fraction into contact with a solid acid catalyst, the method being characterized by comprising steps of: (a) an oligomerization reaction of isobutene; (b) a distillation to separate an unreacted C4 fraction and an oligomer fraction including a generated C8 fraction; and (C) a distillation to purify the diisobutylene in the C8 fraction, the conversion rate of the isobutene in the mixed C4 fraction being controlled to a range 60-95%.

Description

technical field [0001] The present invention relates to a method for producing diisobutene using a mixed C4 fraction as a raw material. More specifically, it relates to a method in which a mixed C4 fraction is contacted with a solid acid catalyst, preferably a silica-alumina catalyst, to react in one stage. After the oligomerization reaction of isobutene, distillation operation is carried out to produce high-purity diisobutene with high added value and high reaction selectivity. Background technique [0002] Diisobutene (hereinafter sometimes abbreviated as "DIB"), which is a dimer of isobutylene, is known as a raw material for oxoalcohol, isononanoic acid, p-octylphenol, rubber tackifier, Raw materials for surfactants as well as gasoline fuel additives, rubber chemicals, and the like are useful. [0003] As a method for producing diisobutylene, in general, isobutylene in the C4 fraction produced by FCC (fluid catalytic cracking) or ethylene production plant (ethylene produ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C07C2/12C07C7/04C07C11/02C07B61/00
CPCC07C7/04C07C2/12C07C2/06C07C11/02
Inventor山川文雄舘崎圭中川贵史
OwnerIDEMITSU KOSAN CO LTD