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Catalyst for oxidative esterification of isobutene, preparation method and application thereof

An oxidative esterification and catalyst technology, which can be used in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., and can solve the problem of catalyst economy. High, low catalytic activity of the catalyst, etc., to achieve the effect of reducing energy consumption

Active Publication Date: 2021-07-23
北京水木滨华科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Once reported a kind of propylene oxidation esterification to synthesize the catalyst of allyl alcohol acetate in the prior art, but when it is used for isobutene oxidation esterification to synthesize 2-methyl allyl alcohol acetate, but find that the catalyst's The catalytic activity is obviously not high, that is, the economy of the catalyst is not high. How to prepare a catalyst suitable for the oxidative esterification of isobutylene and have a significantly improved economy has become a new research direction.

Method used

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  • Catalyst for oxidative esterification of isobutene, preparation method and application thereof
  • Catalyst for oxidative esterification of isobutene, preparation method and application thereof
  • Catalyst for oxidative esterification of isobutene, preparation method and application thereof

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preparation example Construction

[0040] The present invention also provides a preparation method for the above-mentioned catalyst for oxidative esterification of isobutylene, said method comprising the steps of:

[0041] (1) The carrier is first contacted with an alkaline solution, and then contacted with a metal solution to prepare a metal-loaded carrier;

[0042] (2) contacting the metal-loaded carrier in step (1) with a reducing agent to react to prepare a catalyst precursor; optionally, roasting the catalyst precursor;

[0043] (3) The catalyst precursor in step (2) is loaded with a catalytic promoter to prepare the catalyst for oxidative esterification of isobutylene.

[0044] Wherein, step (1) specifically includes the following steps:

[0045](1-1) Immersing the carrier into an alkaline solution and drying to obtain a carrier loaded with an alkaline substance;

[0046] (1-2) Spray the metal solution onto the carrier carrying the alkaline substance, and the metal component and the alkaline substance u...

Embodiment 1

[0089] (1) Dissolve 4.0 g of sodium metasilicate nonahydrate in 40 mL of water, and add to 40 g of 5 mm silica pellets (water absorption: 1.0 mL / g) for impregnation. After the impregnating liquid is completely absorbed, place the silica pellets in an oven at 110° C. for 12 hours to obtain dried silica pellets.

[0090] (2) Dissolve 1.7g of sodium tetrachloropalladate and 0.2g of copper chloride dihydrate in 40mL of water to form a metal solution. By means of spraying and dipping, the metal solution is evenly sprayed on the above-mentioned dried silica pellets, and left to stand for 24 hours for alkalization precipitation to obtain precipitated silica pellets.

[0091] (3) Add 40mL of 20wt.% hydrazine hydrate solution to the precipitated silica pellets, reduce the metal component precipitated on the silica pellets, wash, filter, and dry to obtain a catalyst precursor.

[0092] (4) 2.0 g of potassium acetate was dissolved in 40 mL of water, impregnated in the catalyst precursor...

Embodiment 2

[0095] Change the 4.0g sodium metasilicate nonahydrate in step (1) of embodiment 1 to 3.0g sodium metasilicate nonahydrate, and keep other steps unchanged.

[0096] Catalyst cross section photo as figure 2 shown.

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Abstract

The invention provides a catalyst for oxidative esterification of isobutene, a preparation method and application thereof. The catalyst includes a metal and a carrier, the metal is supported on the surface of the carrier within a certain thickness range, and the metal is loaded so that the catalyst presents a core-shell structure, wherein the core is the part of the carrier that is not supported by the metal, and the shell is the part that is supported by the metal. The concentration of the metal in the carrier part supported by the metal gradually changes from the outer layer to the inner layer in the radial direction. In the invention, the catalyst is prepared by impregnating the basic substance on the carrier first, and then impregnating the metal component. The principle is: when impregnating the metal solution, when the metal solution enters the center of the carrier, the metal component encounters the alkaline substance previously loaded on the carrier to form a precipitate, and before the metal solution reaches the center of the carrier, the metal component The catalyst has been consumed through precipitation to obtain a catalyst with a core-shell structure in which the metal components are concentrated and distributed on the outer layer of the carrier along the radial direction.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a catalyst for oxidative esterification of isobutene, a preparation method and application thereof. Background technique [0002] 2-Methallyl alcohol, also known as 2-methyl-2-propen-1-ol, 3-hydroxy-2-methylpropene or isobutenol, has a molecular weight of 72.11 and a boiling point of 113-115°C. Its performance is similar to that of allyl alcohol Similar, but much less toxic than allyl alcohol, it can be used as a substitute for allyl alcohol in many fields. [0003] The application fields of 2-methallyl alcohol in foreign countries are mainly concentrated in the fields of polymers, spices, and medicine. [0004] The existing 2-methallyl alcohol is usually prepared by oxidative esterification of isobutylene to generate 2-methallyl alcohol acetate, followed by hydrolysis of 2-methallyl alcohol acetate. And the key step of preparing 2-methallyl alcohol is the oxidati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/04B01J23/89C07C67/055C07C69/145
CPCB01J31/04B01J23/8926C07C67/055B01J2231/70B01J2231/49B01J35/19C07C69/145
Inventor 王世华宋立明郑虓
Owner 北京水木滨华科技有限公司
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