CN115385778B - Method for synthesizing benzenediol by phenol hydroxylation - Google Patents

Method for synthesizing benzenediol by phenol hydroxylation Download PDF

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CN115385778B
CN115385778B CN202211008185.1A CN202211008185A CN115385778B CN 115385778 B CN115385778 B CN 115385778B CN 202211008185 A CN202211008185 A CN 202211008185A CN 115385778 B CN115385778 B CN 115385778B
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molecular sieve
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catalyst
titanium
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CN115385778A (en
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闫海生
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Shenyang Kaichuang Lisi Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C37/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring
    • C07C37/60—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring by oxidation reactions introducing directly hydroxy groups on a =CH-group belonging to a six-membered aromatic ring with the aid of other oxidants than molecular oxygen or their mixtures with molecular oxygen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/89—Silicates, aluminosilicates or borosilicates of titanium, zirconium or hafnium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J33/00—Protection of catalysts, e.g. by coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
    • B01J2229/30—After treatment, characterised by the means used
    • B01J2229/32—Reaction with silicon compounds, e.g. TEOS, siliconfluoride
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts

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  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
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Abstract

The invention belongs to the technical field of synthesis of benzenediol, and particularly relates to a method for synthesizing benzenediol by hydroxylation of phenol. The method comprises the following steps: s1, selecting a titanium silicalite molecular sieve as a catalyst bed layer; s2, filling the catalyst bed prepared in the step S1 into a fixed bed reactor; s3, enabling a methanol solution of phenol and hydrogen peroxide to enter a catalyst bed to obtain a crude product; s4, rectifying and purifying the crude product to obtain the products of hydroquinone and catechol. The single pass conversion rate of the phenol can be 20-33%, and the selectivity of the benzenediol can reach 90-95%; simultaneously hydroquinone: the catechol ratio is 2.5-3.5:1, which is far higher than the prior art; and the effective utilization rate of hydrogen peroxide reaches 75-85% through a fixed bed continuous process, so that the waste of raw materials is effectively reduced.

Description

Method for synthesizing benzenediol by phenol hydroxylation
Technical Field
The invention belongs to the technical field of synthesis of benzenediol. More particularly, to a method for synthesizing benzenediol by hydroxylation of phenol.
Background
The benzenediol (including hydroquinone and catechol) is an important chemical raw material and has wide application field. Hydroquinone, also known as hydroquinone, is used in the photosensitive industry in large amounts as a developer, as well as a petroleum anticoagulant, catalytic desulfurization agent, and the like. Hydroquinone is an important raw material for anthraquinone dyes and azo dyes; is also an important raw material of the antioxidant of essence and grease; are used as antioxidants and inhibitors of autoxidation due to their easy reaction with peroxidized radicals; in addition, hydroquinone and its alkyl compounds are used as polymerization inhibitors for monomer storage and transportation. Catechol, also known as pyrocatechol, is used in the pharmaceutical, pesticide, fragrance, photographic, resin, paint, etc. industries. Guaiacol prepared from catechol is an important raw material for vanillin production; tert-butylcatechol, prepared from catechol, is a polymerization inhibitor for butadiene and styrene; the synthetic resin obtained by polycondensation of catechol and various aldehydes can improve the stability of nylon fiber.
In the prior art, the preparation methods of the benzenediol are numerous. In recent years, the method for preparing the benzenediol by oxidizing and hydroxylating the phenol with the hydrogen peroxide is focused by related expert students because of simple process and no three-waste emission, and the benzenediol generated by oxidizing the phenol is easier to oxidize than the phenol, so the selection of the catalyst and the optimization of the benzenediol preparation process are particularly important.
The titanium-silicon molecular sieve catalyst makes the reaction of preparing the benzenediol by oxidizing the phenol with the hydrogen peroxide advanced compared with the prior transition metal salt catalyst, and has the remarkable characteristics that: under proper reaction conditions, the titanium-silicon molecular sieve has good catalytic performance on the selective oxidation of phenol, can effectively avoid the deep oxidation of the benzenediol, and can be reused. However, only French Rona-Planck, italian Egyptian and Japanese Kogyo are successful in industrialization at present, but the molecular sieve is not fully used in other countries because of high cost, strict equipment requirements and high catalyst recovery requirements, high dehydration energy consumption due to the use of low-concentration hydrogen peroxide, complicated intermittent operation of a slurry bed, severe working environment and serious influence on the technical competitiveness. In addition, hydroquinone is much more expensive than catechol, so that ortho-contrast is also an important indicator for the phenol hydroxylation reaction in relation to economy.
CN112125786a discloses a method for synthesizing hydroquinone by hydroxylation of phenol, which comprises the steps of synthesizing hydroquinone by hydroxylation reaction of phenol and hydrogen peroxide in a system of a solvent and an acidic reagent under the action of a TS-1 catalyst; the specific method comprises the following steps: (1) Adding a TS-1 catalyst, phenol, a solvent and an acidic reagent into a four-necked flask, and continuously stirring and heating after circulating cooling and refluxing; (2) And then dropwise adding 30% or 50% hydrogen peroxide, and carrying out heat preservation reaction after the dropwise adding is finished to obtain hydroquinone. The method can obviously increase the proportion of hydroquinone in the products generated by phenol hydroxylation, and reduce the content of byproducts and tar.
CN201210489440.9, CN201410520453.7, CN201310342500.9, etc. all disclose preparation methods of titanium silicalite molecular sieve catalysts, but all have problems of low single pass conversion, poor selectivity of benzene diphenol, low para/catechol ratio, short catalyst life, etc.
Disclosure of Invention
The invention aims to overcome the defects and the shortcomings of the prior art and provide a method for synthesizing the benzenediol by hydroxylation of phenol. The method comprises the following steps: s1, selecting a titanium silicalite molecular sieve as a catalyst bed layer; s2, filling the catalyst bed prepared in the step S1 into a fixed bed reactor; s3, enabling a methanol solution of phenol and hydrogen peroxide to enter a catalyst bed to obtain a crude product; s4, rectifying and purifying the crude product to obtain the products of hydroquinone and catechol. The single pass conversion rate of the phenol can be 20-33%, and the selectivity of the benzenediol can reach 90-95%; simultaneously hydroquinone: the catechol ratio is 2.5-3.5:1, which is far higher than the prior art; and the effective utilization rate of hydrogen peroxide reaches 70-80% through a fixed bed continuous process, so that the waste of raw materials is effectively reduced.
The invention aims to provide a method for synthesizing hydroquinone by hydroxylation of phenol.
The above object of the present invention is achieved by the following technical scheme:
a method for preparing benzenediol, comprising the following steps:
s1, selecting a titanium silicalite molecular sieve as a catalyst bed layer;
s2, filling the catalyst bed prepared in the step S1 into a fixed bed reactor;
s3, enabling a methanol solution of phenol and hydrogen peroxide to enter a catalyst bed to obtain a crude product;
s4, rectifying and purifying the crude product to obtain the products of hydroquinone and catechol.
Preferably, the preparation method of the titanium silicalite molecular sieve in the step S1 comprises the steps of firstly uniformly mixing silica sol, organic amine, surfactant and silane coupling agent to form a mixture; uniformly mixing a titanium-silicon molecular sieve and the mixture to form slurry, and finally carrying out spray forming on the slurry to obtain a catalyst intermediate; mixing the obtained catalyst intermediate with water, pretreating, filtering, drying and roasting to obtain the microsphere titanium silicalite molecular sieve catalyst.
Preferably, in the preparation method of the titanium silicalite molecular sieve in the step S1, the organic amine is one of fatty amine, the surfactant is nonionic surfactant, and the silane coupling agent is KH792, DL602 or a mixture of the two in any proportion.
Preferably, siO 2: organic amine in silica sol: and (2) a surfactant: the mol ratio of the silane coupling agent is 1:0.08-0.12: 0.1-0.12:0.2-0.8.
Preferably, siO 2: organic amine in silica sol: and (2) a surfactant: the mol ratio of the silane coupling agent is 1:0.08-0.10: 0.1-0.11:0.5-0.6.
Preferably, in the preparation method of the titanium silicalite molecular sieve in the step S1, the organic amine is one of diethylamine, tripropylamine and n-butylamine, and the surfactant is linear 8-carbon octanol polyoxyethylene ether, linear 8-carbon isooctyl octanol polyoxyethylene ether or a mixture of the two in any proportion.
Preferably, in the preparation method of the titanium silicalite molecular sieve in the step S1, the weight ratio of SiO2 to the titanium silicalite molecular sieve in the mixture is 0.6-0.7:1, and the titanium silicalite molecular sieve is a molecular sieve containing skeleton titanium.
Preferably, in the preparation method of the titanium silicalite molecular sieve in the step S1, the obtained catalyst intermediate is mixed with water according to the weight ratio of 1:10-12, then the mixture is treated for 8-10 hours under the conditions of 120-140 ℃ and self-hydrothermal pressure, filtered and dried, and baked for 20-25 hours at 700-750 ℃ to obtain the microsphere titanium silicalite molecular sieve catalyst.
Preferably, the mole ratio of phenol to hydrogen peroxide is 1-5:1, wherein the mass concentration of the phenol is 15-30%, the reaction condition of the methanol solution of the phenol and the hydrogen peroxide entering the catalyst bed layer is 20-90 ℃, 0.1-4MPa, and the phenol airspeed is 0.05-4h < -1 >, and the continuous reaction is carried out under the condition.
Preferably, the reaction condition of the methanol solution of phenol and hydrogen peroxide entering the catalyst bed layer is 75-80 ℃, 0.8-1.2MPa, and the phenol airspeed is 0.1-0.2h < -1 >.
The invention has the following beneficial effects:
1. the single pass conversion rate of the phenol can reach 20-33%, and the selectivity of the benzenediol can reach 90-95%; simultaneously hydroquinone: the catechol ratio is 2.5-3.5:1, which is far higher than the prior art;
2. according to the invention, through a fixed bed continuous process, the effective utilization rate of hydrogen peroxide reaches 75-85%, so that the waste of raw materials is effectively reduced;
3. according to the invention, through the mutual coordination of the surfactant and the silane coupling agent in the preparation process, the interaction between the surfactant and the silane coupling agent is combined, and the catalyst prepared by combining a specific preparation method has proper pore volume, so that the carbon deposit resistance of the catalyst is remarkably improved, the catalyst has long-period reaction life, the catalyst life is more than or equal to 2000 hours, and the catalyst cost is reduced.
Detailed Description
The present invention is further illustrated below with reference to specific examples, which are not intended to limit the invention in any way. Unless specifically stated otherwise, the reagents, methods and apparatus employed in the present invention are those conventional in the art.
Reagents and materials used in the following examples are commercially available unless otherwise specified.
Example 1
Silica sol 0.1mol, diethylamine 0.01mol, linear 8-carbon octanol polyoxyethylene ether 0.004mol, linear 8-carbon isooctyl alcohol polyoxyethylene ether 0.006mol, silane coupling agent KH 792.03 mol, and silane coupling agent DL 602.02 mol; uniformly mixing to form a mixture; uniformly mixing the mixture with Ti-MWW to form slurry, wherein the weight ratio of SiO2 to titanium-silicon molecular sieve in the mixture is 0.63:1, and finally carrying out spray forming on the slurry to obtain a catalyst intermediate; mixing the obtained catalyst intermediate with water according to the weight ratio of 1:10, then treating for 8 hours under the conditions of 120 ℃ and self hydrothermal pressure, filtering, drying, and roasting for 22 hours at 730 ℃ to obtain the microsphere titanium silicalite molecular sieve catalyst.
Example 2
Uniformly mixing 0.1mol of silica sol, 0.01mol of diethylamine, 0.01mol of linear 8-carbon octanol polyoxyethylene ether, 0.03mol of silane coupling agent KH792 and 0.02mol of silane coupling agent DL602 to form a mixture; uniformly mixing the mixture with Ti-MWW to form slurry, wherein the weight ratio of SiO2 to titanium-silicon molecular sieve in the mixture is 0.63:1, and finally carrying out spray forming on the slurry to obtain a catalyst intermediate; mixing the obtained catalyst intermediate with water according to the weight ratio of 1:10, then treating for 8 hours under the conditions of 120 ℃ and self hydrothermal pressure, filtering, drying, and roasting for 22 hours at 730 ℃ to obtain the microsphere titanium silicalite molecular sieve catalyst.
Example 3
Uniformly mixing 0.1mol of silica sol, 0.01mol of diethylamine, 0.01mol of linear 8-carbon isooctyl alcohol polyoxyethylene ether and 0.05mol of silane coupling agent KH792 to form a mixture; uniformly mixing the mixture with Ti-MWW to form slurry, wherein the weight ratio of SiO2 to titanium-silicon molecular sieve in the mixture is 0.63:1, and finally carrying out spray forming on the slurry to obtain a catalyst intermediate; mixing the obtained catalyst intermediate with water according to the weight ratio of 1:10, then treating for 8 hours under the conditions of 120 ℃ and self hydrothermal pressure, filtering, drying, and roasting for 22 hours at 730 ℃ to obtain the microsphere titanium silicalite molecular sieve catalyst.
Example 4
Uniformly mixing 0.1mol of silica sol, 0.01mol of diethylamine, 0.004mol of linear 8-carbon octanol polyoxyethylene ether, 0.006mol of linear 8-carbon isooctyl alcohol polyoxyethylene ether and 0.05mol of silane coupling agent KH792 to form a mixture; uniformly mixing the mixture with Ti-MWW to form slurry, wherein the weight ratio of SiO2 to titanium-silicon molecular sieve in the mixture is 0.63:1, and finally carrying out spray forming on the slurry to obtain a catalyst intermediate; mixing the obtained catalyst intermediate with water according to the weight ratio of 1:10, then treating for 8 hours under the conditions of 120 ℃ and self hydrothermal pressure, filtering, drying, and roasting for 22 hours at 730 ℃ to obtain the microsphere titanium silicalite molecular sieve catalyst.
Example 5
Silica sol 0.1mol, diethylamine 0.01mol, linear 8-carbon octanol polyoxyethylene ether 0.004mol, linear 8-carbon isooctyl alcohol polyoxyethylene ether 0.006mol, and silane coupling agent DL 602.05 mol; uniformly mixing to form a mixture; uniformly mixing the mixture with Ti-MWW to form slurry, wherein the weight ratio of SiO2 to titanium-silicon molecular sieve in the mixture is 0.63:1, and finally carrying out spray forming on the slurry to obtain a catalyst intermediate; mixing the obtained catalyst intermediate with water according to the weight ratio of 1:10, then treating for 8 hours under the conditions of 120 ℃ and self hydrothermal pressure, filtering, drying, and roasting for 22 hours at 730 ℃ to obtain the microsphere titanium silicalite molecular sieve catalyst.
Example 6
Uniformly mixing 0.1mol of silica sol, 0.01mol of diethylamine, 0.01mol of linear 8-carbon octanol polyoxyethylene ether and 0.05mol of silane coupling agent KH792 to form a mixture; uniformly mixing the mixture with Ti-MWW to form slurry, wherein the weight ratio of SiO2 to titanium-silicon molecular sieve in the mixture is 0.62:1, and finally carrying out spray forming on the slurry to obtain a catalyst intermediate; mixing the obtained catalyst intermediate with water according to the weight ratio of 1:10, then treating for 8 hours under the conditions of 120 ℃ and self hydrothermal pressure, filtering, drying, and roasting for 22 hours at 730 ℃ to obtain the microsphere titanium silicalite molecular sieve catalyst.
Example 7
Uniformly mixing 0.2mol of silica sol, 0.02mol of tripropylamine, 0.022mol of linear 8-carbon isooctyl alcohol polyoxyethylene ether and 0.06mol of silane coupling agent DL602 to form a mixture; uniformly mixing the mixture with Ti-Beta to form slurry, wherein the weight ratio of SiO2 to titanium-silicon molecular sieve in the mixture is 0.64:1, and finally carrying out spray forming on the slurry to obtain a catalyst intermediate; mixing the obtained catalyst intermediate with water according to the weight ratio of 1:12, then treating for 10 hours under the conditions of 140 ℃ and self hydrothermal pressure, filtering, drying, and roasting for 25 hours at 750 ℃ to obtain the microsphere titanium silicalite molecular sieve catalyst.
Comparative example 1
Uniformly mixing 0.2mol of silica sol, 0.02mol of tripropylamine and 0.082mol of linear 8-carbon isooctyl alcohol polyoxyethylene ether to form a mixture; uniformly mixing the mixture with Ti-Beta to form slurry, wherein the weight ratio of SiO2 to titanium-silicon molecular sieve in the mixture is 0.64:1, and finally carrying out spray forming on the slurry to obtain a catalyst intermediate; mixing the obtained catalyst intermediate with water according to the weight ratio of 1:12, then treating for 10 hours under the conditions of 140 ℃ and self hydrothermal pressure, filtering, drying, and roasting for 25 hours at 750 ℃ to obtain the microsphere titanium silicalite molecular sieve catalyst.
Comparative example 2
Evenly mixing 0.2mol of silica sol, 0.02mol of tripropylamine and 0.082mol of silane coupling agent DL602 to form a mixture; uniformly mixing the mixture with Ti-Beta to form slurry, wherein the weight ratio of SiO2 to titanium-silicon molecular sieve in the mixture is 0.64:1, and finally carrying out spray forming on the slurry to obtain a catalyst intermediate; mixing the obtained catalyst intermediate with water according to the weight ratio of 1:12, then treating for 10 hours under the conditions of 140 ℃ and self hydrothermal pressure, filtering, drying, and roasting for 25 hours at 750 ℃ to obtain the microsphere titanium silicalite molecular sieve catalyst.
The molecular sieve catalysts prepared in examples 1-6 were tested as follows:
1kg of catalyst was charged into a fixed bed reactor, phenol: hydrogen peroxide (30%) =3:1 (mol ratio), phenol concentration 22wt%, solvent is methanol, the materials are mixed and then enter a reaction system (catalyst bed) through a high-pressure pump at a flow rate of phenol airspeed of 0.2h < -1 >, and after reaction, the materials enter a receiving bottle; the crude product is rectified and purified to obtain a product a (hydroquinone and catechol), the tail gas is discharged into the atmosphere after secondary absorption, and the temperature of a reaction system is 80 ℃ and the pressure is 1.0MPa.
The molecular sieve catalysts prepared in example 7 and comparative examples 1-2 were tested as follows:
1kg of catalyst B was charged into a fixed bed reactor, phenol: hydrogen peroxide (30%) =2:1 (mol ratio), the concentration of phenol is 23wt%, the solvent is methanol, the materials are mixed and then enter a reaction system (catalyst bed) through a high-pressure pump at the flow speed of phenol airspeed of 1.5h < -1 >, and after reaction, the materials enter a receiving bottle; the crude product is rectified and purified to obtain a product b (hydroquinone and catechol), the tail gas is discharged into the atmosphere after secondary absorption, and the temperature of a reaction system is 80 ℃ and the pressure is 1.0MPa.
The specific test results of examples 1-7 and comparative examples 1-2 are shown in Table 1:
TABLE 1
As can be seen from Table 1, the preparation process of the invention has excellent conversion rate, selectivity, i.e. para/catechol ratio, and hydrogen peroxide and catalyst life are relatively high.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.

Claims (8)

1. A preparation method for synthesizing benzenediol by phenol hydroxylation is characterized by comprising the following steps:
the method comprises the following steps:
s1, selecting a titanium silicalite molecular sieve as a catalyst bed layer;
s2, filling the catalyst bed prepared in the step S1 into a fixed bed reactor;
s3, enabling a methanol solution of phenol and hydrogen peroxide to enter a catalyst bed to obtain a crude product;
s4, rectifying and purifying the crude product to obtain hydroquinone and catechol;
the preparation method of the titanium silicalite molecular sieve in the step S1 comprises the steps of firstly uniformly mixing silica sol, organic amine, surfactant and silane coupling agent to form a mixture; uniformly mixing a titanium-silicon molecular sieve and the mixture to form slurry, and finally carrying out spray forming on the slurry to obtain a catalyst intermediate; mixing the obtained catalyst intermediate with water, pretreating, filtering, drying and roasting to obtain the microsphere titanium silicalite molecular sieve catalyst; the silane coupling agent is KH792, DL602 or the mixture of the two in any proportion; the surfactant is linear 8-carbon octanol polyoxyethylene ether, linear 8-carbon isooctyl polyoxyethylene ether or a mixture of the two at any proportion;
the molar ratio of phenol to hydrogen peroxide is 1-5:1, wherein the mass concentration of the phenol is 15-30%, the reaction condition of the methanol solution of the phenol and the hydrogen peroxide entering the catalyst bed layer is 20-90 ℃, 0.1-4MPa, and the space velocity of the phenol is 0.05-4h -1 。
2. The method of manufacturing according to claim 1, characterized in that:
in the preparation method of the titanium silicalite molecular sieve in the step S1, the organic amine is one of fatty amine.
3. The method of manufacturing according to claim 1, characterized in that:
SiO in silica sol 2 Organic amine: and (2) a surfactant: silicon (Si)The molar ratio of the alkane coupling agent is 1:0.08-0.12: 0.1-0.12:0.2-0.8.
4. A method of preparation according to claim 3, characterized in that:
SiO in silica sol 2 Organic amine: and (2) a surfactant: the mol ratio of the silane coupling agent is 1:0.08-0.10: 0.1-0.11:0.5-0.6.
5. The method of manufacturing according to claim 1, characterized in that:
in the preparation method of the titanium silicalite molecular sieve in the step S1, the organic amine is one of diethylamine, tripropylamine and n-butylamine.
6. The method of manufacturing according to claim 1, characterized in that:
in the S1 step titanium silicalite molecular sieve preparation method, siO in the mixture 2 The weight ratio of the titanium-silicon molecular sieve to the titanium-silicon molecular sieve is 0.6-0.7:1, and the titanium-silicon molecular sieve is a molecular sieve containing skeleton titanium.
7. The method of manufacturing according to claim 1, characterized in that:
in the preparation method of the titanium silicalite molecular sieve in the step S1, the obtained catalyst intermediate is mixed with water according to the weight ratio of 1:10-12, then the mixture is treated for 8-10 hours under the conditions of 120-140 ℃ and self hydrothermal pressure, filtered, dried and roasted for 20-25 hours at 700-750 ℃ to obtain the microsphere titanium silicalite molecular sieve catalyst.
8. The method of manufacturing according to claim 1, characterized in that:
phenol and H 2 O 2 The reaction condition of the methanol solution entering the catalyst bed layer is 75-80 ℃, 0.8-1.2MPa and the phenol airspeed is 0.1-0.2h -1 。
CN202211008185.1A 2022-08-22 2022-08-22 Method for synthesizing benzenediol by phenol hydroxylation Active CN115385778B (en)

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CN116253619A (en) * 2023-03-06 2023-06-13 沈阳开拓利思科技有限公司 Preparation method of benzenediol
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CN112774726A (en) * 2020-12-29 2021-05-11 上海华谊新材料有限公司 Spherical titanium-silicon molecular sieve catalyst and preparation method thereof
CN114345404A (en) * 2021-12-28 2022-04-15 万华化学集团股份有限公司 Phenol hydroxylation catalyst and preparation method thereof, and phenol hydroxylation method

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JPH10291948A (en) * 1997-04-18 1998-11-04 Mitsubishi Gas Chem Co Inc Production of dihydric phenols
CN101371989A (en) * 2007-08-22 2009-02-25 中国石油化工股份有限公司 Titanium silicon molecular sieve catalyst as well as preparation method and use thereof
CN112774726A (en) * 2020-12-29 2021-05-11 上海华谊新材料有限公司 Spherical titanium-silicon molecular sieve catalyst and preparation method thereof
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CN114345404A (en) * 2021-12-28 2022-04-15 万华化学集团股份有限公司 Phenol hydroxylation catalyst and preparation method thereof, and phenol hydroxylation method

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