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A kind of method of oxidation phenol

A technology of phenol and oxidant, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., to achieve the effects of being beneficial to industrial production and application, improving total life, and extending operating time

Active Publication Date: 2019-03-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is still room for improvement in the conversion rate of phenol, the selectivity of the target product hydroquinone, and the life of the catalyst in this preparation method.

Method used

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  • A kind of method of oxidation phenol
  • A kind of method of oxidation phenol
  • A kind of method of oxidation phenol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The reaction is carried out in two miniature fixed-bed reactors connected in series, wherein each reactor is filled with a catalyst bed with a circular cross-section and an equal diameter. Based on the flow direction of the liquid material, the first upstream The ratio of the inner diameter of the first catalyst bed in the first reactor to the inner diameter of the second catalyst bed in the second downstream reactor is 2:1, and the first catalyst bed is filled with hollow titanium-silicon molecular sieves, The second catalyst bed is filled with titanium-silicon molecular sieve TS-1, and the weight ratio of hollow titanium-silicon molecular sieve to titanium-silicon molecular sieve TS-1 is 2:1.

[0039] Phenol, hydrogen peroxide as an oxidant (provided in the form of 30% by weight hydrogen peroxide) and methanol as a solvent were fed from the bottom of the first reactor through the first catalyst bed in contact with the shaped hollow Titanium-silicon molecular sieve con...

Embodiment 2

[0043] Adopt the method identical with embodiment 1 to oxidize phenol, difference is, adjust the reaction temperature of catalyst in the first catalyst bed layer and the second catalyst bed layer, make the reaction temperature of the first catalyst bed layer be 70 ℃, the second catalyst bed layer The reaction temperature of the layer was 55°C.

[0044] The results are listed in Table 2 for reaction times of 1 hour, 120 hours and 240 hours.

Embodiment 3

[0046] Adopt the method identical with embodiment 1, difference is, adjust the temperature of reaction of catalyst in the first catalyst bed layer and the second catalyst bed layer, make the reaction temperature of the first catalyst bed layer be 55 ℃, the reaction temperature of the second catalyst bed layer The reaction temperature was 70°C.

[0047] The results are listed in Table 2 for reaction times of 1 hour, 120 hours and 240 hours.

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Abstract

The invention relates to a phenol oxidation method. According to the method, under a phenol oxidation condition, materials including phenol and an oxidant contact a catalyst with titanium silicalite molecular sieve as an active component in a fixed bed. The method is characterized in that the fixed bed comprises a first catalyst bed layer and a second catalyst bed layer that are at least connected in series; a liquid mixture flows through the first catalyst bed layer and the second catalyst bed layer sequentially; and the superficial velocity of the liquid mixture flowing through the first catalyst bed layer is lower than the superficial velocity of the liquid mixture flowing through the second catalyst bed layer. With the method, during a reaction contact process, catalyst activity, oxidant total conversion rate and target product selectivity can be maintained. Therefore, total catalyst one-way running time is extended, catalyst deactivation is retarded, and catalyst total service life is improved.

Description

technical field [0001] The present invention relates to a method for oxidizing phenol. Background technique [0002] Hydroquinone and catechol are two important chemical raw materials and chemical intermediates, which have a wide range of uses. Catechol can be used as rubber hardener, electroplating additive, skin antiseptic and fungicide, hair dye, photographic developer, color photo antioxidant, fur dyeing developer, paint and varnish anti-peeling agent. Hydroquinone is mainly used in developers, anthraquinone dyes, azo dyes, synthetic ammonia cosolvents, rubber antioxidants, polymerization inhibitors, stabilizers for paints and flavors, and antioxidants. [0003] In the prior art, benzoquinone is formed by oxidation of an aromatic hydroxyl compound (such as phenol) with oxygen or an oxygen-containing gas, a copper-containing catalyst, and an optional promoter, and then a reduction reaction is used to form hydroquinone. But this method can't prepare benzoquinone and hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C39/08C07C37/60
Inventor 林民史春风朱斌
Owner CHINA PETROLEUM & CHEM CORP
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