Preparation method of catalyst for isobutylene preparation through oxidative dehydrogenation of isobutane

A technology for oxidative dehydrogenation and production of isobutene, which is applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, carbon compound catalyst, etc. Catalyst cost and other issues, to achieve the effect of facilitating industrial scale-up, reducing concentration difference, and reducing metal consumption

Active Publication Date: 2017-07-14
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the presence of oxygen, the target product of isobutane oxidative dehydrogenation reaction and isobutane are prone to deep oxidation, resulting in waste of raw materials and low selectivity of target products.
The reaction of isobutane oxidative dehydrogenation to isobutene is also a fast reaction (this kind of fast reaction is generally carried out under the condition of mass transfer control), and the reaction is completed when the reactant reaches the outer surface of the catalyst, so the inner surface of the catalyst Does not contribute much to the target reaction, which results in lower metal utilization in the pores of the carrier, increases catalyst cost, and accelerates deep oxidation of the product

Method used

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  • Preparation method of catalyst for isobutylene preparation through oxidative dehydrogenation of isobutane
  • Preparation method of catalyst for isobutylene preparation through oxidative dehydrogenation of isobutane

Examples

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Embodiment 1

[0028] Weigh 2.97g of nickel nitrate and 0.55g of ammonium tungstate and dissolve them in 14mL of deionized water to obtain solution A; use equal volume impregnation method to load on 16g of alumina carrier (pore volume is 0.73mL / g, specific surface area is 253m 2 / g, strip shape, equivalent diameter 1.5mm), impregnated at room temperature for 2h, aged for 4h, dried at 80°C for 12h, and calcined at 700°C for 4h to prepare catalyst precursor B, wherein the supported Ni was calculated as the final catalyst The supported W is 2% of the final catalyst based on the weight of the element; the catalyst precursor B is activated in a mixed atmosphere containing hydrogen, and the hydrogen volume content in the mixed gas is 80%, and the reducing condition is 450 ° C, 0.2 MPa (absolute pressure), reduction time 4h; Dissolve 0.74g ammonium molybdate in 15mL deionized water to obtain solution C, and mix it with 4 times the mass of furfural aqueous solution with a mass fraction of 40%, and th...

Embodiment 2

[0030] Weigh 2.97g of nickel nitrate and 0.55g of ammonium tungstate and dissolve them in 14mL of deionized water to obtain solution A; use equal volume impregnation method to load on 16g of silica carrier (pore volume is 0.97mL / g, specific surface area is 372m 2 / g, spherical shape, equivalent diameter 0.5mm), impregnated at room temperature for 2h, aged for 4h, dried at 80°C for 12h, and calcined at 700°C for 4h to obtain the catalyst precursor B, wherein, the supported Ni is calculated by element weight, which is the weight of the final catalyst 3%, the supported W is 2% of the final catalyst based on the weight of the element; the catalyst precursor B is activated in a mixed atmosphere containing hydrogen, the volume content of hydrogen in the mixed gas is 80%, and the reducing conditions are 450 ° C, 0.2 MPa ( Absolute pressure), the reduction time is 4h; Dissolve 0.74g ammonium molybdate in 15mL deionized water to obtain solution C, and mix it with 4 times the mass of fur...

Embodiment 3

[0032] Weigh 2.97g of nickel nitrate and 0.55g of ammonium tungstate and dissolve them in 14mL of deionized water to obtain solution A; use equal volume impregnation method to load on 16g of SBA-15 carrier (pore volume is 1.23mL / g, specific surface area is 701m 2 / g, strip shape, equivalent diameter 1.5mm), impregnated at room temperature for 2h, aged for 4h, dried at 80°C for 12h, and calcined at 700°C for 4h to prepare catalyst precursor B, wherein the supported Ni was calculated as the final catalyst The supported W is 2% of the final catalyst based on the weight of the element; the catalyst precursor B is activated in a mixed atmosphere containing hydrogen, and the hydrogen volume content in the mixed gas is 80%, and the reducing condition is 450 ° C, 0.2 MPa (absolute pressure), reduction time 4h; Dissolve 0.74g ammonium molybdate in 15mL deionized water to obtain solution C, and mix it with 4 times the mass of furfural aqueous solution with a mass fraction of 40%, and the...

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Abstract

The present invention relates to a preparation method of a catalyst for isobutylene preparation through oxidative dehydrogenation of isobutane, wherein the catalyst comprises a first active component, a second active component, a first auxiliary agent, a second auxiliary agent and a carrier. The preparation method comprises: preparing a catalyst precursor A, and reducing the catalyst precursor A; dissolving an auxiliary agent precursor in water, and uniformly mixing with a furfural aqueous solution; adding the obtained mixture and the catalyst precursor A to a high pressure reaction kettle, adding a solution C, and carrying out a reaction; and treating and separating the obtained solid-liquid mixture, filtering the obtained solid sample, drying, and calcining to obtain the catalyst. According to the present invention, the waste residue oil hydrotreating catalyst is completely utilized so as to save the cost; and the prepared catalyst has characteristics of high reaction activity, metal consumption reducing, and isobutylene selectivity improving.

Description

technical field [0001] The invention relates to a preparation method of a catalyst for preparing isobutene by oxidative dehydrogenation of isobutane, in particular to a preparation method of a supported catalyst for preparing isobutene by oxidative dehydrogenation of isobutane. Background technique [0002] With the development of petrochemical technology, isobutene has become the most important basic chemical raw material in olefins except ethylene and propylene. The development of downstream products that use isobutene as a resource has led to a rapid increase in my country's demand for isobutene. [0003] Isobutane is mainly derived from the petroleum catalytic cracking production process. With the increasing demand of refineries to maximize economic benefits, the project of producing isobutene from isobutane has attracted extensive attention. At present, isobutene is mainly produced by catalytic dehydrogenation of isobutane in industry. The method for preparing isobute...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01J29/035B01J37/18C07C5/48C07C11/09
CPCB01J23/888B01J23/8885B01J29/0358B01J37/18B01J2229/18C07C5/48C07C2523/888C07C2529/035C07C11/09
Inventor 张舒冬孙晓丹刘继华
Owner CHINA PETROLEUM & CHEM CORP
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