CN113117723A - Composite catalyst for synthesizing p-phenyl dimethyl ether and preparation method and industrial application thereof - Google Patents

Composite catalyst for synthesizing p-phenyl dimethyl ether and preparation method and industrial application thereof Download PDF

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CN113117723A
CN113117723A CN202110409555.1A CN202110409555A CN113117723A CN 113117723 A CN113117723 A CN 113117723A CN 202110409555 A CN202110409555 A CN 202110409555A CN 113117723 A CN113117723 A CN 113117723A
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synthesizing
composite catalyst
antioxidant
catalyst
reaction
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薛其才
戚文博
严良
李蕾蕾
寇永利
徐桥桥
聂颖颖
拓婷婷
许明杰
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Shaanxi Coal and Chemical Technology Institute Co Ltd
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    • 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
    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/24—Nitrogen compounds
    • B01J27/25—Nitrates
    • 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
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
    • 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
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
    • B01J31/28—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24 of the platinum group metals, iron group metals or copper
    • B01J31/30—Halides
    • 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
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
    • B01J31/32—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24 of manganese, technetium or rhenium
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
    • C07C41/01—Preparation of ethers
    • C07C41/16—Preparation of ethers by reaction of esters of mineral or organic acids with hydroxy or O-metal groups

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  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • Inorganic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

The invention discloses a composite catalyst for synthesizing p-phenyl dimethyl ether, a preparation method and industrial application thereof, belonging to the technical field of chemical catalysts. The composite catalyst for synthesizing the p-xylylene ether comprises a main catalyst and an antioxidant; the main catalyst comprises an active component and an auxiliary agent; the active component is alkali metal or alkaline earth metal halide, and the auxiliary agent is metal nitrate; wherein, according to mole percentage, the main catalyst comprises: 30 to 90 percent of active component and 10 to 70 percent of auxiliary agent. The composite catalyst for synthesizing the p-xylylene ether has the advantages of simple preparation process and low cost. The catalyst for synthesizing the dimethyl terephthalate can be used for producing the dimethyl terephthalate by using hydroquinone as a raw material and dimethyl carbonate as a methylating agent, has high catalytic activity and high product yield, and realizes large-scale industrial application.

Description

Composite catalyst for synthesizing p-phenyl dimethyl ether and preparation method and industrial application thereof
Technical Field
The invention belongs to the technical field of chemical catalysts, and relates to a composite catalyst for synthesizing p-xylylene ether, a preparation method and industrial application thereof.
Background
The p-xylylene ether is a fine chemical product with high added value, and is widely applied to medical and agricultural chemicals. Can be used for producing medicines such as methoxylamine hydrochloride, dye black salt ANS, etc., fragrance fixative, daily chemicals, and essence for preparing food and cigarette; the additive can also be used as an anti-weathering agent for plastics and coatings.
At present, the main industrial production method is to react hydroquinone with alkali to obtain sodium phenolate, and then to react with dimethyl sulfate to obtain the product. The reaction condition of this route is comparatively mild, but raw materials dimethyl sulfate is high poison, and the potential safety hazard is big, produces a large amount of phenol-containing in the production process, contains salt waste water and waste solid, pollutes more seriously, and the aftertreatment cost is very high moreover, along with people's attention to the ecological environment, the environmental protection requirement is constantly upgraded, needs to study new to the dimethyl ether process route of benzene, realizes the reduction of environmental hazard, becomes the important problem that field research worker awaits the solution urgently.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a composite catalyst for synthesizing the dimethyl terephthalate, a preparation method and an industrial application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the invention discloses a composite catalyst for synthesizing p-phenyl dimethyl ether, which comprises a main catalyst and an antioxidant; the main catalyst comprises an active component and an auxiliary agent; the active component is alkali metal or alkaline earth metal halide, and the auxiliary agent is metal nitrate.
Preferably, the active component is NaCl, NaBr, NaI, KCl, CaCl2、MgCl2One or more of them.
Preferably, the auxiliary agent is Ca (NO)3)2、Cu(NO3)2、Mg(NO3)2、Zn(NO3)2、Al(NO3)3、Mn(NO3)2One or more of them.
Preferably, the antioxidant is one or more of antioxidant 264, antioxidant 330, antioxidant 1010 and antioxidant 1076.
Preferably, the amount of the substance added with the active component is 30-90% of the main catalyst, and the amount of the substance added with the auxiliary agent is 10-70% of the main catalyst according to the molar percentage; according to the mass percentage, the mass of the added antioxidant is 5-30% of that of the main catalyst.
The invention discloses a preparation method of the composite catalyst for synthesizing the p-xylylene ether, which comprises the steps of uniformly mixing an active component, an auxiliary agent and an antioxidant to obtain the composite catalyst for synthesizing the p-xylylene ether; wherein, the mixing adopts mechanical stirring, the stirring speed is 10-60 r/min, and the stirring time is 0.5-2.0 h.
The invention discloses industrial application of the composite catalyst for synthesizing the dimethyl ether, and the composite catalyst for synthesizing the dimethyl ether is used for synthesizing the dimethyl ether by taking hydroquinone and dimethyl carbonate as raw materials.
Preferably, the specific operation for synthesizing the p-xylylene ether comprises: uniformly mixing hydroquinone and dimethyl carbonate to obtain a reactant system, adding the composite catalyst during methylation reaction of the reactant system to perform catalytic reaction to obtain a product system, cooling the product system, purifying, and synthesizing to obtain the dimethyl terephthalate.
Further preferably, hydroquinone and dimethyl carbonate are mixed according to a molar ratio of 1 (2.0-4.0), and the mass percentage of the composite catalyst for synthesizing the dimethyl terephthalate added during the methylation reaction is 0.1-5.0 wt% of that of the hydroquinone. Further preferably, the operating parameters of the catalytic reaction include: the stirring speed is 50-200 r/min; the reaction pressure is 2-10 MPa; the reaction temperature is 150-380 ℃, and the reaction time is 2-15 h.
Wherein KCl and Al (NO) are preferably used in the composite catalyst for synthesizing the p-xylylene ether 3)3Forming a main catalyst, and taking an antioxidant 1010 as an antioxidant; wherein KCl is used as active component, Al (NO)3)3As an auxiliary agent, the amount of a substance added with KCl is 80 percent of that of the main catalyst according to molar percentage, and Al (NO) is added3)3The amount of substance (b) is 20% of the main catalyst; according to the mass percentage, the mass of the added antioxidant 1010 is 10 percent of that of the main catalyst; the reaction temperature is 250 ℃ and the reaction pressure is 5 MPa.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a composite catalyst for synthesizing dimethyl terephthalate, which takes alkali metal halide or alkaline earth metal halide as a main catalyst, takes metal nitrate as an auxiliary agent, is added with an antioxidant, can be used for catalyzing hydroquinone and dimethyl carbonate to react to generate the dimethyl terephthalate, and avoids environmental pollution and equipment corrosion caused by the reaction of taking highly toxic dimethyl sulfate as a methylating agent. Therefore, the composite catalyst for synthesizing the p-xylylene ether solves the problem of dependence on toxic raw materials and processes in the preparation and production of the p-xylylene ether in the prior art, and realizes the synthesis process of the p-xylylene ether which is harmless, nontoxic and pollution-free to the environment.
The invention also discloses a preparation method of the composite catalyst for synthesizing the p-xylylene ether, and the composite catalyst has the advantages of simple preparation process, no use of a complex preparation device, simple process conditions and low preparation cost.
The invention also discloses the industrial application of the composite catalyst for synthesizing the dimethyl terephthalate, the composite catalyst for synthesizing the dimethyl terephthalate can be used for producing the dimethyl terephthalate by using hydroquinone as a raw material and dimethyl carbonate as a methylating agent, the catalytic activity is high, the product yield is high, and the industrial application is successfully realized. By selecting dimethyl carbonate with low pollution and environmental protection as a raw material, compared with the existing dimethyl sulfate process, the raw material cost is low, the production efficiency is high, almost no waste water and waste solids are generated, and the existing high-pollution process can be quickly replaced. Therefore, the method can effectively avoid using a methylation reagent dimethyl sulfate with high toxicity and high safety risk in the traditional production process of the dimethyl terephthalate, further avoid producing a large amount of solid waste and high-salt and high-toxicity wastewater in the production process, and has great pollution. In the specific implementation mode of the invention, after the composite catalyst for synthesizing the dimethyl terephthalate is used, the yield of the dimethyl terephthalate is more than 75% and the purity is more than 99.5% in the industrial application of synthesizing the dimethyl terephthalate by taking hydroquinone and dimethyl carbonate as raw materials. In particular, the optimal synthesis conditions in the industrial applications described in the present invention are: the main catalyst is 80% KCl and 20% Al (NO) 3)3(ii) a 10% antioxidant 1010; the yield of the dimethyl ether reaches 90 percent and the purity is more than 99.5 percent at the temperature of 250 ℃ and the pressure of 5 MPa.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terms first, second and the like in the description and in the claims of the present invention are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a composite catalyst for synthesizing dimethyl terephthalate by using hydroquinone and dimethyl carbonate as raw materials, which comprises a main catalyst and an antioxidant; the main catalyst comprises an active component and an auxiliary agent, wherein the active component is alkali metal or alkaline earth metal halide NaCl, NaBr, NaI, KCl, CaCl2、MgCl2One or more of the above; the auxiliary agent is metal nitrate Ca (NO)3)2、Cu(NO3)2、Mg(NO3)2、Zn(NO3)2、Al(NO3)3、Mn(NO3)2One or more of the above;
the main catalyst comprises the following components in percentage by mole: 30-90% of active component and 10-70% of auxiliary agent;
the antioxidant is one or more of antioxidant 264, antioxidant 330, antioxidant 1010 and antioxidant 1076.
According to the mass percentage, the mass of the added antioxidant is 5-30% of that of the main catalyst.
Correspondingly, the invention further provides a preparation method of the catalyst for synthesizing the dimethyl terephthalate by taking the hydroquinone and the dimethyl carbonate as raw materials, which comprises the following steps:
1) according to the composition proportion of the main catalyst, a certain amount of active components of alkali metal or alkaline earth metal halide and auxiliary agent metal nitrate are weighed, the usage amount of each component enables the final active component to account for 30-90% of the main catalyst by mol percent, the auxiliary agent to account for 10-70% of the main catalyst by mol percent, and then antioxidant with the mass percent of 5-30% of the main catalyst is weighed.
2) Mechanically mixing the three components at room temperature at a stirring speed of 10-60r/min for 0.5-2.0 h.
The invention also provides the application of the composite catalyst in synthesizing the dimethyl terephthalate by taking the hydroquinone and the dimethyl carbonate as raw materials, the scale of the production line of the dimethyl terephthalate is 100 tons/year, and the volume of a single reaction kettle is 2.5m3. Hydroquinone and dimethyl carbonate are mixed according to the molar ratio of 1 (2.0-4.0), the composite catalyst is added with the mass percent of 0.1-5.0 wt% of the hydroquinone during methylation reaction, the stirring speed is 50-200 r/min, the reaction temperature is 150-380 ℃, the reaction pressure is 2-10 MPa, and the reaction time is 2-15 h. The reaction mixed liquid is purified by freezing, cooling, crystallizing and obtaining the required p-xylylene ether.
The invention will be further illustrated with reference to specific examples:
example 1
Weighing 50% NaCl and 50% Ca (NO) according to mol percentage3)2The method is used for preparing a main catalyst, antioxidant 264 with the mass fraction of 5% of the main catalyst is weighed, the corresponding three components are added into a solid mixing device, the stirring speed is 50r/min at room temperature, and the stirring time is 0.5 h. And barreling the mixed composite catalyst for synthesizing the p-xylylene ether for later use.
At 2.5m3In the reaction kettle, hydroquinone and dimethyl carbonate are mixed according to a molar ratio of 1: 2.0, carrying out methylation reaction on the composite catalyst, wherein the dosage of the prepared composite catalyst for synthesizing the dimethyl ether is 1 wt% of hydroquinone, the stirring rate is 80r/min, the reaction temperature is 200 ℃, and the reaction pressure is highThe force is 4MPa, and the reaction time is 6 h. After the reaction is finished, the mixed solution is frozen, cooled, crystallized and purified, the yield of the p-xylylene ether is 81 percent, and the purity is more than 99.5 percent.
Example 2
Weighing 50% NaBr and 50% Cu (NO) according to mol percentage3)2The method is used for preparing a main catalyst, then the antioxidant 330 with the mass fraction of 10 percent of the main catalyst is weighed, the corresponding three components are added into a solid mixing device, the stirring speed is 50r/min under the room temperature condition, and the stirring time is 0.5 h. And barreling the mixed composite catalyst for synthesizing the p-xylylene ether for later use.
At 2.5m3In the reaction kettle, hydroquinone and dimethyl carbonate are mixed according to a molar ratio of 1: 2.5, carrying out methylation reaction on the composite catalyst, wherein the dosage of the prepared composite catalyst for synthesizing the dimethyl terephthalate is 1.5 wt% of hydroquinone, the stirring rate is 100r/min, the reaction temperature is 210 ℃, the reaction pressure is 5MPa, and the reaction time is 6 h. After the reaction is finished, the mixed solution is frozen, cooled, crystallized and purified, the yield of the p-xylylene ether is 87%, and the purity is more than 99.5%.
Example 3
Weighing 67% NaI and 33% Zn (NO) according to mol percentage3)2The preparation method is used for preparing a main catalyst, antioxidant 1010 with the mass fraction of 15% of the main catalyst is weighed, the corresponding three components are added into a solid mixing device, the stirring speed is 50r/min at room temperature, and the stirring time is 0.5 h. And barreling the mixed composite catalyst for synthesizing the p-xylylene ether for later use.
At 2.5m3In the reaction kettle, hydroquinone and dimethyl carbonate are mixed according to a molar ratio of 1: 3.0, carrying out methylation reaction on the composite catalyst, wherein the dosage of the prepared composite catalyst for synthesizing the dimethyl terephthalate is 2 wt% of hydroquinone, the stirring rate is 150r/min, the reaction temperature is 175 ℃, the reaction pressure is 3MPa, and the reaction time is 12 h. After the reaction is finished, the mixed solution is frozen, cooled, crystallized and purified, the yield of the p-xylylene ether is 77 percent, and the purity is more than 99.5 percent.
Example 4
Weighing 30% NaCl and 20% Mg (NO) according to mol percentage3)2The method is used for preparing a main catalyst, then the antioxidant 1076 with the mass fraction of 30 percent of the main catalyst is weighed, the corresponding three components are added into a solid mixing device, and the stirring speed is 50r/min and the stirring time is 0.5h under the condition of room temperature. And barreling the mixed composite catalyst for synthesizing the p-xylylene ether for later use.
At 2.5m3In the reaction kettle, hydroquinone and dimethyl carbonate are mixed according to a molar ratio of 1: 3.5, carrying out methylation reaction on the composite catalyst, wherein the dosage of the prepared composite catalyst for synthesizing the dimethyl terephthalate is 3.0 wt% of hydroquinone, the stirring rate is 200r/min, the reaction temperature is 150 ℃, the reaction pressure is 2MPa, and the reaction time is 15 h. After the reaction is finished, the mixed solution is frozen, cooled, crystallized and purified, the yield of the p-xylylene ether is 75%, and the purity is more than 99.5%.
Example 5
Weighing 80% KCl and 20% Al (NO) according to mol percentage3)3The preparation method is used for preparing a main catalyst, antioxidant 1010 with the mass fraction of 10% of the main catalyst is weighed, the corresponding three components are added into a solid mixing device, the stirring speed is 10r/min at room temperature, and the stirring time is 1.0 h. And barreling the mixed composite catalyst for synthesizing the p-xylylene ether for later use.
At 2.5m3In the reaction kettle, hydroquinone and dimethyl carbonate are mixed according to a molar ratio of 1: 4.0, carrying out methylation reaction on the composite catalyst, wherein the dosage of the prepared composite catalyst for synthesizing the dimethyl terephthalate is 4.0 wt% of hydroquinone, the stirring rate is 150r/min, the reaction temperature is 250 ℃, the reaction pressure is 5MPa, and the reaction time is 9 h. After the reaction is finished, the mixed solution is frozen, cooled, crystallized and purified, the yield of the p-xylylene ether is 90 percent, and the purity is more than 99.5 percent.
Example 6
Weighing 90 percent of CaCl according to the mol percentage2With 10% Mn (NO)3)2Used for preparing a main catalyst, then weighing antioxidant 1010 with the mass fraction of the main catalyst being 10 percent, and adding the corresponding three componentsThe solid mixture was stirred at room temperature for 2.0h at a rate of 10 r/min. And barreling the mixed composite catalyst for synthesizing the p-xylylene ether for later use.
At 2.5m3In the reaction kettle, hydroquinone and dimethyl carbonate are mixed according to a molar ratio of 1: 2.25, carrying out methylation reaction on the composite catalyst, wherein the dosage of the prepared composite catalyst for synthesizing the dimethyl terephthalate is 5 wt% of hydroquinone, the stirring rate is 150r/min, the reaction temperature is 300 ℃, the reaction pressure is 6.5MPa, and the reaction time is 4 h. After the reaction is finished, the mixed solution is frozen, cooled, crystallized and purified, the yield of the p-xylylene ether is 82%, and the purity is more than 99.5%.
Example 7
Weighing 50% MgCl according to mol percentage2With 50% Zn (NO)3)2The method is used for preparing a main catalyst, antioxidant 264 with the mass fraction of 10% of the main catalyst is weighed, the corresponding three components are added into a solid mixing device, the stirring speed is 30r/min at room temperature, and the stirring time is 1.5 h. And barreling the mixed composite catalyst for synthesizing the p-xylylene ether for later use.
At 2.5m3In the reaction kettle, hydroquinone and dimethyl carbonate are mixed according to a molar ratio of 1: 2.75, carrying out methylation reaction on the composite catalyst, wherein the dosage of the prepared composite catalyst for synthesizing the dimethyl terephthalate is 0.5 wt% of hydroquinone, the stirring rate is 100r/min, the reaction temperature is 340 ℃, the reaction pressure is 8MPa, and the reaction time is 3 h. After the reaction is finished, the mixed solution is frozen, cooled, crystallized and purified, the yield of the p-xylylene ether is 88 percent, and the purity is more than 99.8 percent.
Example 8
Weighing 35 percent of NaCl and 35 percent of CaCl according to molar percentage2With 30% Al (NO)3)3The method comprises the steps of preparing a main catalyst, weighing a mixed antioxidant of an antioxidant 264 and an antioxidant 1010 with the mass fraction of the main catalyst being 10% (wherein the mass ratio of the antioxidant 264 to the antioxidant 1010 is 1:1), adding the corresponding three components into a solid mixing device, stirring at room temperature at the stirring speed of 30r/min for a stirring time of 30r/minIs 0.5 h. And barreling the mixed composite catalyst for synthesizing the p-xylylene ether for later use.
At 2.5m3In the reaction kettle, hydroquinone and dimethyl carbonate are mixed according to a molar ratio of 1: 2.25, carrying out methylation reaction on the composite catalyst, wherein the dosage of the prepared composite catalyst for synthesizing the dimethyl terephthalate is 0.1 wt% of hydroquinone, the stirring rate is 150r/min, the reaction temperature is 380 ℃, the reaction pressure is 10MPa, and the reaction time is 2 h. After the reaction is finished, the mixed solution is frozen, cooled, crystallized and purified, the yield of the p-xylylene ether is 86%, and the purity is more than 99.8%.
Example 9
Weighing 20% NaBr, 40% NaI and 70% Zn (NO) according to mol percentage3)2The method is used for preparing a main catalyst, then a mixed antioxidant of an antioxidant 264 and an antioxidant 1010 with the mass fraction of the main catalyst being 50 percent is weighed (wherein the mass ratio of the antioxidant 264 to the antioxidant 1076 is 1:4), the corresponding three components are added into a solid mixing device, the stirring speed is 60r/min under the condition of room temperature, and the stirring time is 1 h. And barreling the mixed composite catalyst for synthesizing the p-xylylene ether for later use.
At 2.5m3In the reaction kettle, hydroquinone and dimethyl carbonate are mixed according to a molar ratio of 1: 3.5, carrying out methylation reaction on the composite catalyst, wherein the dosage of the prepared composite catalyst for synthesizing the dimethyl terephthalate is 3.5 wt% of hydroquinone, the stirring rate is 50r/min, the reaction temperature is 190 ℃, the reaction pressure is 7MPa, and the reaction time is 10 h. After the reaction is finished, the mixed solution is frozen, cooled, crystallized and purified, the yield of the p-xylylene ether is 80 percent, and the purity is more than 99.5 percent.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.

Claims (10)

1. The composite catalyst for synthesizing the p-xylylene ether is characterized by comprising a main catalyst and an antioxidant; the main catalyst comprises an active component and an auxiliary agent; the active component is alkali metal or alkaline earth metal halide, and the auxiliary agent is metal nitrate.
2. The composite catalyst for synthesizing p-xylylene ether as claimed in claim 1, wherein the active component is NaCl, NaBr, NaI, KCl, CaCl2、MgCl2One or more of them.
3. The composite catalyst for synthesizing p-xylylene ether as claimed in claim 1, wherein the auxiliary is Ca (NO)3)2、Cu(NO3)2、Mg(NO3)2、Zn(NO3)2、Al(NO3)3、Mn(NO3)2One or more of them.
4. The composite catalyst for synthesizing p-xylylene ether as claimed in claim 1, wherein the antioxidant is one or more of antioxidant 264, antioxidant 330, antioxidant 1010 and antioxidant 1076.
5. The composite catalyst for synthesizing p-xylylene ether as claimed in claim 1, wherein the amount of the substance added with the active component is 30-90% of the main catalyst, and the amount of the substance added with the auxiliary agent is 10-70% of the main catalyst in terms of mole percentage;
according to the mass percentage, the mass of the added antioxidant is 5-30% of that of the main catalyst.
6. The preparation method of the composite catalyst for synthesizing p-xylylene ether as claimed in any one of claims 1 to 5, wherein the composite catalyst for synthesizing p-xylylene ether is obtained by uniformly mixing an active component, an auxiliary agent and an antioxidant;
wherein, the mixing adopts mechanical stirring, the stirring speed is 10-60 r/min, and the stirring time is 0.5-2.0 h.
7. The industrial application of the composite catalyst for synthesizing the dimethyl terephthalate as claimed in any one of claims 1 to 5, wherein the composite catalyst for synthesizing the dimethyl terephthalate is used for synthesizing the dimethyl terephthalate by using hydroquinone and dimethyl carbonate as raw materials.
8. Industrial application according to claim 7, characterized by comprising the following operations: uniformly mixing hydroquinone and dimethyl carbonate to obtain a reactant system, adding the composite catalyst during methylation reaction of the reactant system to perform catalytic reaction to obtain a product system, cooling the product system, purifying, and synthesizing to obtain the dimethyl terephthalate.
9. The industrial application of claim 8, wherein hydroquinone and dimethyl carbonate are mixed in a molar ratio of 1 (2.0-4.0), and the mass percentage of the composite catalyst for synthesizing the dimethyl terephthalate added during the methylation reaction is 0.1-5.0 wt% of the hydroquinone.
10. Industrial application according to claim 8, characterized in that the operating parameters of the catalytic reaction comprise: the stirring speed is 50-200 r/min; the reaction pressure is 2-10 MPa; the reaction temperature is 150-380 ℃, and the reaction time is 2-15 h.
CN202110409555.1A 2021-04-16 2021-04-16 Composite catalyst for synthesizing p-phenyl dimethyl ether and preparation method and industrial application thereof Pending CN113117723A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113509947A (en) * 2021-07-21 2021-10-19 陕西煤业化工技术研究院有限责任公司 Catalyst for synthesizing p-methyl anisole and preparation method and application thereof
CN115555043A (en) * 2022-09-09 2023-01-03 陕西煤业化工技术研究院有限责任公司 Preparation method and application of catalyst for synthesizing m-phenyl dimethyl ether by using resorcinol and dimethyl carbonate as raw materials

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110841663A (en) * 2019-11-25 2020-02-28 陕西煤业化工技术研究院有限责任公司 Catalyst for synthesizing anisole by taking phenol and dimethyl carbonate as raw materials, preparation method and application
CN111298843A (en) * 2020-04-03 2020-06-19 陕西煤业化工技术研究院有限责任公司 Catalyst for catalyzing reaction of pyrogallol and dimethyl carbonate to synthesize 1,2, 3-trimethoxybenzene, and preparation method and application thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110841663A (en) * 2019-11-25 2020-02-28 陕西煤业化工技术研究院有限责任公司 Catalyst for synthesizing anisole by taking phenol and dimethyl carbonate as raw materials, preparation method and application
CN111298843A (en) * 2020-04-03 2020-06-19 陕西煤业化工技术研究院有限责任公司 Catalyst for catalyzing reaction of pyrogallol and dimethyl carbonate to synthesize 1,2, 3-trimethoxybenzene, and preparation method and application thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113509947A (en) * 2021-07-21 2021-10-19 陕西煤业化工技术研究院有限责任公司 Catalyst for synthesizing p-methyl anisole and preparation method and application thereof
CN113509947B (en) * 2021-07-21 2023-09-26 陕西煤业化工技术研究院有限责任公司 Catalyst for synthesizing p-methylanisole as well as preparation method and application thereof
CN115555043A (en) * 2022-09-09 2023-01-03 陕西煤业化工技术研究院有限责任公司 Preparation method and application of catalyst for synthesizing m-phenyl dimethyl ether by using resorcinol and dimethyl carbonate as raw materials
CN115555043B (en) * 2022-09-09 2023-08-29 陕西煤业化工技术研究院有限责任公司 Preparation method and application of catalyst for synthesizing isophthalate by taking resorcinol and dimethyl carbonate as raw materials

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Application publication date: 20210716