A kind of benzene cyclohexene catalyst and its preparation method and application

A catalyst and cyclohexene technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the difficulty of catalyst salt, the difficulty of precious metal recovery, and the conversion rate of benzene low level problem

Active Publication Date: 2016-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

USP4678861 discloses a technology for the partial hydrogenation of benzene to cyclohexene in a suspended state. The catalytic reaction is completed in two phases. The disadvantage of this process is that the catalyst must be separated from the organic phase and compared with possible salts. difficulty
Chinese patent CN1597099A discloses a ruthenium-based supported catalyst prepared by an impregnation precipitation method with metal oxide zirconia as a carrier. The yield of cyclohexene can only reach 40%, and the catalyst uses zirconia as a carrier, and the precious metal difficult to recycle
But the conversion rate of benzene is low

Method used

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  • A kind of benzene cyclohexene catalyst and its preparation method and application
  • A kind of benzene cyclohexene catalyst and its preparation method and application
  • A kind of benzene cyclohexene catalyst and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1 (if there is no special note below, the percentages are all percentages by weight)

[0027] The preparation steps of a kind of catalyst of the present invention are as follows:

[0028](1) Take 1 mole of ethyl orthosilicate and 20 moles of tetrabutyl titanate, mix them slowly and drop them into 100 liters of nitric acid solution with a pH value of 2 at 35°C, stir rapidly, and carry out hydrolysis. After completion, continue to stir for 20 minutes, let stand for aging for 4 hours, separate out the solid, dry at 110°C for 8 hours, and bake at 580°C for 3 hours to obtain a molar ratio of silicon dioxide to titanium dioxide of 1:20 and a specific surface area of ​​506m 3 / g, silica and titania composite oxide with a pore volume of 0.71cm3 / g.

[0029] (2) Take 400 grams of boric acid aqueous solution containing 15 grams of boron oxide, and 475 grams of the composite oxide obtained in step (1), fully mix them at room temperature, let stand for 12 hours, dry at...

Embodiment 2

[0032] The preparation method of a catalyst of the present invention is the same as that in Example 1, except that in the silicon dioxide and titanium dioxide composite oxide prepared in step (1), the molar ratio of silicon dioxide and titanium dioxide is 1:5, and the specific surface area is 537m 3 / g, the pore volume is 0.68cm3 / g; (2) the amount of boric acid used in the step is different; (3) the iron-containing compound used in the step is ferrous nitrate, and the content is different. A catalyst of the present invention was obtained, coded as E-2, its composition is shown in Table 1, and the reaction results of benzene partial hydrogenation to cyclohexene are shown in Table 2.

Embodiment 3

[0034] The preparation method of a catalyst of the present invention is the same as that in Example 1, except that in the silicon dioxide and titanium dioxide composite oxide prepared in step (1), the molar ratio of silicon dioxide and titanium dioxide is 1:10, and the specific surface area is 637m 3 / g, the pore volume is 0.60cm3 / g; (3) The active metal component used in the step is palladium, and the content is different. A catalyst of the present invention was obtained, coded as E-3, its composition is shown in Table 1, and the reaction results of cyclohexene produced by partial hydrogenation of benzene are shown in Table 2.

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Abstract

The invention discloses a catalyst for producing cyclohexene from benzene and a preparation method thereof. The catalyst uses titanium dioxide-silicon dioxide composite oxide as a carrier and VIII? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? One or more of the group elements are active metal components, and boron oxide and iron oxide are used as cocatalysts. According to the weight content of the final catalyst, the content of boron oxide is 0.2~10.0%, and the content of iron oxide is 0.5~10.0%. , the content of Group VIII active metal components is 0.1%~10%, and the balance is titanium dioxide-silicon dioxide composite oxide. A preparation method of a catalyst for preparing cyclohexene from benzene, which is prepared by loading boron oxide, iron oxide and Group VIII active metal components on a titanium dioxide-silicon dioxide composite oxide carrier. The catalyst can obviously improve the conversion rate of benzene and the selectivity of cyclohexene.

Description

technical field [0001] The invention relates to a catalyst for preparing cyclohexene from benzene, a preparation method and application thereof. Background technique [0002] Cyclohexene has active double bonds and is an important organic chemical raw material. As an intermediate, cyclohexene can be widely used in the production of medicines, pesticides, dyes, detergents, explosives, feed additives, polyesters and other fine chemicals. [0003] Industrially, there are many ways to obtain cyclohexene. Traditionally, there are methods such as dehydration of cyclohexanol and dehydrohalogenation of halocyclohexane. Due to the use of high-cost cyclohexanol and halocyclohexane as raw materials, and the complicated process, the production cost of cyclohexene obtained by traditional methods is relatively high. The cyclohexene obtained by the traditional method is usually only suitable for the preparation of products with small demand and high added value. Catalytic selective hyd...

Claims

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Application Information

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IPC IPC(8): B01J23/89
CPCY02P20/52
Inventor 徐会青贾立明王伟刘全杰
Owner CHINA PETROLEUM & CHEM CORP
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