O-phenyl phenol preparation catalyst by cyclohexanone dimer dehydrogenation and preparation method thereof

A technology of cyclohexanone dimer and o-phenylphenol is applied in the field of catalyst and preparation field for preparing o-phenylphenol by dehydrogenation of cyclohexanone dimer, and can solve the problem of low conversion rate and selectivity, low catalyst The problems of poor stability and high catalyst cost can achieve the effect of simple activation and regeneration procedure, improved structural stability, high yield and selectivity

Inactive Publication Date: 2009-06-17
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This catalyst has poor stability, low conversion rate and selectivity, and many reaction by-products
[0009] Chinese patent CN200610097298 discloses a preparation method of Cu-Mg catalyst for the preparation of o-phenylphenol. Co-precipitation method is adopted, and the conversion rate and selectivity are also high, but the stability is not good and the service life is not long
[0010] Chinese patent CN200710022479 discloses a preparation process of ortho-phenylphenol. The dehydrogenation reaction is carried out in a fixed-bed reactor, and the obtained product is then subjected to vacuum distillation and cooling slices to obtain the ortho-phenylphenol product. The focus of the article is on ortho-phenylphenol Although it is mentioned that the catalyst components are rare earth elements, alkali metals and noble metals, it fails to clearly mention the components loaded on the catalyst carrier and the preparation method of the catalyst.
[0011] Chinese patent CN200710103661 discloses a method for synthesizing o-phenylphenol with aniline compounds. Aniline compounds are diazotized and coupled to generate

Method used

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  • O-phenyl phenol preparation catalyst by cyclohexanone dimer dehydrogenation and preparation method thereof
  • O-phenyl phenol preparation catalyst by cyclohexanone dimer dehydrogenation and preparation method thereof
  • O-phenyl phenol preparation catalyst by cyclohexanone dimer dehydrogenation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] Example 1

[0036] Weigh 1300 grams of pseudo-boehmite and 1000 grams of water and mix and stir to prepare pseudo-boehmite slurry. After stirring, add 82 grams of lanthanum nitrate hexahydrate (La(NO) dissolved in 600 ml of deionized water while stirring. 3 ) 3 ·6H 2 O) Aqueous solution, stir to make it fully dissolved, evenly disperse, add nitric acid solution dropwise, dissolve until the pseudo-boehmite slurry becomes a sol state, after drying the sol at 100~120℃, at 500℃ It is calcined for 6 hours, and then developed into 20-40 mesh particles after cooling to obtain lanthanum oxide modified alumina (La 2 O 3 / γ-Al 2 O 3 ).

Example Embodiment

[0037] Example 2

[0038] Weigh 0.148 g of potassium sulfate and dissolve it in 6 ml of deionized water, take 8 g of the catalyst carrier in Example 1 and soak for 4 hours, then dry at a constant temperature of 100-120°C for 10 hours, and calcinate at 500°C for 6 hours; measure 0.02 g / ml of chloroplatinic acid (H 2 PtCl 6 ·6H 2 O) Add 3.19ml of solution to deionized water to make 6ml solution, and immerse the previously calcined catalyst in it for 4 hours, then dry it at a constant temperature of 100-120°C for 10 hours, and calcinate it at 500°C for 6 hours. Finally, the catalyst is activated with hydrogen diluted with nitrogen, the nitrogen flow rate is 60ml / min, and the hydrogen flow rate is 6ml / min. Under the pressure of 0.1MPa, reductive activation is carried out in a fixed bed reactor at 380°C for 6 hours until there is no steam at the outlet of the reactor, and it is cooled for use.

[0039] The composition of the catalyst is as follows: (based on the percentage weight of t...

Example Embodiment

[0042] Example 3

[0043] Except that the amount of potassium sulfate was changed to 0.296 g, and the chloroplatinic acid solution was changed to 4.26 ml. The catalyst preparation conditions were the same as in Example 2.

[0044] The composition of the catalyst is as follows: (based on the percentage by weight of the active component in the carrier)

[0045] Catalyst composition (wt%)

[0046]

[0047] The catalyst performance evaluation results are shown in Table 1.

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Abstract

The invention discloses an o-phenylphenol catalyst prepared by dehydrogenating cyclohexanone dimer, and a preparation method thereof. A carrier of the catalyst is alumina modified with rare earth oxide, and the catalyst consists of alkali oxide and precious metal which are loaded on the carrier. The invention has the most remarkable characteristic of using the alumina modified with rare earth oxide as the carrier, and another remarkable characteristic of the invention is the preparation method of the catalyst, and the method adopts an isopyknic fractional-step impregnation process, avoids competitive adsorption among components, increases the bonding strength between the components and the carrier, and the like. The catalyst has the advantages of high selectivity to o-phenylphenol, few byproducts, simple preparation process, good stability and capability of simple activation and regeneration after coking deactivation, and is an excellent high-selectivity catalyst with industrial practical value.

Description

technical field [0001] The invention relates to a catalyst for preparing ortho-phenylphenol by dehydrogenation of cyclohexanone dimer and a preparation method thereof. Specifically, the carrier of the catalyst is aluminum oxide modified by rare earth oxide lanthanum oxide (La 2 o 3 / Y-Al 2 o 3 ), alkali metal oxide potassium oxide (K 2 O) and the noble metal platinum (Pt). The performance of the catalyst prepared by this method is obviously better than that of the co-impregnation method. Finally, hydrogen diluted with nitrogen is used to reduce and activate the catalyst in a fixed-bed reactor, and the regenerated catalyst can be reused after deactivation by carbon deposition. Background technique [0002] Ortho-phenylphenol (OPP for short) is an important and widely used fine organic chemical product. It can be used as a dye intermediate, a heat stabilizer for plastics and a flame retardant for polymers. It can also be used for the fluorescence determination of trisac...

Claims

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Application Information

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IPC IPC(8): B01J23/63C07C39/15C07C37/07B01J37/02
Inventor 郭杨龙董艳娥王筠松刘继红卢冠忠郭耘王艳芹
Owner EAST CHINA UNIV OF SCI & TECH
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