CN107537460B - Catalyst system for preparing pyromellitic dianhydride by gas-phase oxidation of durene - Google Patents
Catalyst system for preparing pyromellitic dianhydride by gas-phase oxidation of durene Download PDFInfo
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- CN107537460B CN107537460B CN201710916092.1A CN201710916092A CN107537460B CN 107537460 B CN107537460 B CN 107537460B CN 201710916092 A CN201710916092 A CN 201710916092A CN 107537460 B CN107537460 B CN 107537460B
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Abstract
The invention discloses a catalyst for preparing pyromellitic dianhydride by catalyzing durene and a preparation method thereof. The main catalyst in the catalyst is V2O5And TiO2V, V: molar ratio of Ti 0.05: 1-0.15: 1; the cocatalyst is B2O3And SnO2The amount of substance of V is 1, wherein the amount of substance of B is 0.005-0.05, the amount of substance of Sn is 0.01-0.1, and the catalyst carrier is SiC with phi 5-6 mm. The method has simple process and wide raw materials, can prepare a large amount of catalysts with fine particles, good selectivity and low vanadium content, and is suitable for the application of durene gas-phase oxidation.
Description
Technical Field
The invention relates to the technical field of chemistry, in particular to a catalyst and a preparation method thereof, and especially relates to a catalyst for preparing pyromellitic dianhydride.
Background
Pyromellitic dianhydride (pyromellitic dianhydride for short) is an important chemical raw material and is mainly used as a curing matting agent for synthesizing polyimide and epoxy resin, a cross-linking agent for polyester resin and the like, products produced by the pyromellitic dianhydride have important application in high-end fields such as aviation, microelectronics, separation membranes and the like, and the quality of pyromellitic dianhydride directly determines the quality and the application of subsequent products.
At present, durene is mostly used as a raw material in the production of the pyromellitic anhydride, and the durene is obtained by a liquid phase or gas phase oxidation method. Among them, the gas phase oxidation method is a major method developed at home and abroad due to the characteristics of simple process, omission of dehydration to anhydride process, oxidation under air condition, continuous production and the like.
The catalyst used in the synthesis process of the pyromellitic dianhydride largely determines the yield, selectivity and purity of the product, and common preparation processes for preparing the pyromellitic dianhydride catalyst include a spraying method, an immersion method and the like. The preparation of the catalyst is generally carried out by mixing the components in a predetermined ratio to prepare a suspension for later use by a spray method, then spraying the suspension onto the surface of a carrier by a spray gun to form a certain thickness, and finally calcining and activating the catalyst.
The existing gas phase oxidation method for preparing the pyromellitic anhydride has the problems of low catalyst yield and selectivity, and the catalyst adopted in industry is V2O5-TiO2The catalyst is a composite catalyst mainly comprising other oxides as auxiliaries, but the prepared catalyst has larger particles and poor selectivity, so that the yield is low. In addition, V2O5Has certain toxicity, and the relative content of vanadium is reduced as much as possible while the activity of the catalyst is improved, so that the yield and the purity of the pyromellitic dianhydride are improved.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a catalyst with fine particles, good selectivity and low vanadium content and the preparation of pyromellitic dianhydride by gas-phase oxidation of durene by using the catalyst.
In order to solve the above technical problems, a technical solution of a first aspect of the present invention is: a catalyst system for preparing pyromellitic dianhydride by gas-phase oxidization of durene comprises a main catalyst and a cocatalyst, wherein the main catalyst is V2O5And TiO2V, V: the molar ratio of Ti is 0.05: 1-0.15: 1; the cocatalyst is B2O3And SnO2When the amount of the substance V is 1, the amount of the substance B is 0.005 to 0.05 and the amount of the substance Sn is 0.01 to 0.1.
Preferably, the main catalyst and the cocatalyst are respectively sprayed on a carrier according to the proportion, and the carrier is SiC with the diameter of 5-6 mm.
Preferably, the TiO is2Is nano anatase type TiO2。
Preferably, V: the molar ratio of Ti is 0.05: 0.5-0.5: 1.
The method for preparing the pyromellitic dianhydride by the gas-phase oxidation of the durene comprises the following steps:
50ml of catalyst is loaded into a phi 40mm reaction tube, the temperature of a heating furnace is controlled to be 430-450 ℃, and air is pre-introduced for 5-20 min, so that a small amount of organic matters in the catalyst are decomposed and can form a porous shape on the active surface layer of the catalyst; introducing durene, and carrying out catalytic oxidation by using air at a space velocity of 4500--1And measuring the product yield once every 2 hours, wherein the highest weight yield of the obtained product is 92-94%, and the content of pyromellitic dianhydride is about 94%.
The second aspect of the present invention provides a method for preparing a catalyst for gas phase oxidation of durene to pyromellitic dianhydride, comprising the steps of:
(1) adding ammonium metavanadate into the oxalic acid solution, and reducing the ammonium metavanadate into original vanadium at a certain temperature;
(2) dropwise adding acid into the solution to adjust the pH value to 2-3, and adding a butyl titanate solution dissolved in absolute ethyl alcohol to ensure that the ratio of V: molar ratio of Ti 0.05: 1-0.15: 1, controlling the reaction temperature to prepare V-Ti sol;
(3) adding boric acid and tin tetrachloride pentahydrate into the V-Ti sol according to the molar ratio by taking the mass reference of the V as 1 to prepare sol spraying liquid;
(4) and (4) spraying the sol spraying solution obtained in the step (3) on a carrier, and then putting into a roasting activation mode.
Preferably, in step (1), the vanadium is reduced to vanadium at 80-90 ℃.
Preferably, in the step (2), the reaction temperature is controlled to be 80 to 90 ℃.
Preferably, in the step (4), the carrier is preheated to 230-250 ℃ before spraying; the roasting condition is that the temperature is kept for 30 minutes at 250 ℃, and then the temperature is continuously increased to 480 ℃ for roasting for 2 hours.
The invention has the following beneficial effects:
(1) the catalyst prepared by the method has high mechanical strength, and the active layer on the surface of the catalyst is not easy to crack in the process of transporting and filling the catalyst. The catalyst shows, in use, at a space velocity of4500-4900h-1When the hot spot temperature of the durene is 430-450 ℃, the highest weight yield of the obtained pyromellitic dianhydride is 95 percent, and the purity of the pyromellitic dianhydride is about 95 percent. (2) The invention prepares the spray coating liquid by a sol method, and then the spray coating liquid is roasted and activated to obtain the multi-component nano catalyst which has high purity, uniform particle size distribution, large chemical activity, good selectivity and high yield.
Detailed Description
The above-described scheme is further illustrated below with reference to specific examples. It should be understood that these examples are for illustrative purposes and are not intended to limit the scope of the present invention. The conditions used in the examples may be further adjusted according to the conditions of the particular manufacturer, and the conditions not specified are generally the conditions in routine experiments.
Introduction and summary
The present invention is illustrated by way of example and not by way of limitation. It should be noted that references to "an" or "one" embodiment in this disclosure are not necessarily to the same embodiment, but to at least one.
Various aspects of the invention are described below. It will be apparent, however, to one skilled in the art that the present invention may be practiced according to only some or all aspects of the present invention. For purposes of explanation, specific numbers, materials and configurations are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without specific details. In other instances, well-known features are omitted or simplified in order not to obscure the present invention.
Various operations will be described as multiple discrete steps in turn, and in a manner that is most helpful in understanding the present invention; however, the description in order should not be construed as to imply that these operations are necessarily order dependent.
Various embodiments will be described in terms of typical classes of reactants. It will be apparent to those skilled in the art that the present invention may be practiced using any number of different types of reactants, not just those provided herein for purposes of illustration. Furthermore, it will also be apparent that the invention is not limited to any particular hybrid example.
Example 1:
adding ammonium metavanadate into oxalic acid solution, reducing into vanadium at 80-90 deg.C, dropwise adding hydrochloric acid to adjust pH to 2-3, adding butyl titanate solution dissolved in anhydrous ethanol to make V: ti molar ratio of 0.1: 1, controlling the reaction temperature to prepare V-Ti sol; adding H according to the molar ratio by taking the amount of the substance V as 13BO3Is 0.05, SnCl4·5H2O is 0.05, and is sprayed on SiC which is heated to 230-250 ℃ in advance and phi 5-6mm after being prepared into sol spraying liquid. Then putting the mixture into a muffle furnace, preserving the heat for 30 minutes at 250 ℃, and continuously heating to 480 ℃ to roast for 2 hours. Cooling and taking out for later use.
50ml of catalyst is loaded into a phi 40mm reaction tube, the temperature of a heating furnace is controlled to be 430-450 ℃, and air is pre-introduced for 5min, so that a small amount of organic matters in the catalyst are decomposed, and a porous state can be formed on the active surface layer of the catalyst. Introducing durene, and carrying out catalytic oxidation by using air at a space velocity of 4500--1And measuring the product yield once every 2 hours, wherein the highest weight yield of the obtained product is 92-94%, and the content of pyromellitic dianhydride is about 94%.
Example 2:
adding ammonium metavanadate into oxalic acid solution, reducing into vanadium at 80-90 deg.C, dropwise adding hydrochloric acid to adjust pH to 2-3, adding butyl titanate solution dissolved in anhydrous ethanol to make V: molar ratio of Ti 0.05:1, controlling the reaction temperature to prepare V-Ti sol; adding H according to the molar ratio by taking the amount of the substance V as 13BO3Is 0.01, SnCl4·5H2O is 0.01, and is sprayed on SiC which is heated to 230-250 ℃ in advance and phi 5-6mm after being prepared into sol spraying liquid. Then putting the mixture into a muffle furnace, preserving the heat for 30 minutes at 250 ℃, and continuously heating to 480 ℃ to roast for 2 hours. Cooling and taking out for later use.
50ml of catalyst is loaded into a phi 40mm reaction tube, the temperature of a heating furnace is controlled to be 430 ℃ and 450 ℃, air is pre-introduced for 5min, so that a small amount of organic matters in the catalyst are decomposed,the catalyst active surface layer can be formed in a porous state. Introducing durene, and carrying out catalytic oxidation by using air at a space velocity of 4500--1And measuring the product yield once every 2 hours, wherein the highest weight yield of the obtained product is 93-95%, and the content of pyromellitic dianhydride is about 95%.
Example 3:
adding ammonium metavanadate into oxalic acid solution, reducing into vanadium at 80-90 deg.C, dropwise adding hydrochloric acid to adjust pH to 2-3, adding butyl titanate solution dissolved in anhydrous ethanol to make V: ti molar ratio of 0.15:1, controlling the reaction temperature to prepare V-Ti sol; adding H according to the molar ratio by taking the amount of the substance V as 13BO3Is 0.1, SnCl4·5H2O is 0.1, and is sprayed on SiC which is heated to 230-250 ℃ in advance and phi 5-6mm after being prepared into sol spraying liquid. Then putting the mixture into a muffle furnace, preserving the heat for 30 minutes at 250 ℃, and continuously heating to 480 ℃ to roast for 2 hours. Cooling and taking out for later use.
50ml of catalyst is loaded into a phi 40mm reaction tube, the temperature of a heating furnace is controlled to be 430-450 ℃, and air is pre-introduced for 5min, so that a small amount of organic matters in the catalyst are decomposed, and a porous state can be formed on the active surface layer of the catalyst. Introducing durene, and carrying out catalytic oxidation by using air at a space velocity of 4500--1And measuring the product yield once every 2 hours, wherein the highest weight yield of the obtained product is 92-94%, and the content of pyromellitic dianhydride is about 94%.
Example 4:
adding ammonium metavanadate into oxalic acid solution, reducing into vanadium at 80-90 deg.C, dropwise adding hydrochloric acid to adjust pH to 2-3, adding butyl titanate solution dissolved in anhydrous ethanol to make V: ti molar ratio of 0.15:1, controlling the reaction temperature to prepare V-Ti sol; adding H according to the molar ratio by taking the amount of the substance V as 13BO3Is 0.01, SnCl4·5H2O is 0.1, and is sprayed on SiC which is heated to 230-250 ℃ in advance and phi 5-6mm after being prepared into sol spraying liquid. Then putting the mixture into a muffle furnace, preserving the heat for 30 minutes at 250 ℃, and continuously heating to 480 ℃ to roast for 2 hours. Cooling and taking out for later use.
50ml of the catalyst was loaded into a phi 40mm reaction tube and controlledThe temperature of the heating furnace is 430-450 ℃, and air is introduced in advance for 5min, so that a small amount of organic matters in the catalyst are decomposed, and a porous state can be formed on the active surface layer of the catalyst. Introducing durene, and carrying out catalytic oxidation by using air at a space velocity of 4500--1And measuring the product yield once every 2 hours, wherein the highest weight yield of the obtained product is 93-95%, and the content of pyromellitic dianhydride is about 94%.
The above-described specific embodiments are merely preferred embodiments of the present invention, and it should be noted that, for those skilled in the art, various modifications or substitutions can be made without departing from the principle of the present invention, and these modifications or substitutions should also be regarded as the protection scope of the present invention.
Claims (6)
1. The catalyst for preparing pyromellitic dianhydride by gas-phase oxidation of durene is characterized by comprising a main catalyst and a cocatalyst, wherein the main catalyst is V2O5And TiO2V, V: the molar ratio of Ti is 0.05: 1-0.15: 1; the cocatalyst is B2O3And SnO2The amount of the substance B is 0.005-0.05 and the amount of the substance Sn is 0.01-0.1, based on the amount of the substance V being 1;
the preparation method comprises the following steps:
(1) adding ammonium metavanadate into the oxalic acid solution, and reducing the ammonium metavanadate into original vanadium at a certain temperature;
(2) dropwise adding acid into the solution to adjust the pH value to 2-3, and adding a butyl titanate solution dissolved in absolute ethyl alcohol to ensure that the ratio of V: molar ratio of Ti 0.05: 1-0.15: 1, controlling the reaction temperature to prepare V-Ti sol;
(3) adding boric acid and tin tetrachloride pentahydrate into the V-Ti sol according to the molar ratio by taking the mass reference of the V as 1 to prepare sol spraying liquid;
(4) and (4) spraying the sol spraying solution obtained in the step (3) on a carrier, and then putting into a roasting activation mode.
2. The catalyst according to claim 1, wherein the main catalyst and the cocatalyst are sprayed on a carrier respectively according to the mixture ratio, and the carrier is SiC with the diameter phi of 5-6 mm.
3. The catalyst of claim 1, wherein the TiO is selected from the group consisting of2Is nano anatase type TiO2。
4. The catalyst of claim 1, wherein in step (1), the vanadium is reduced to vanadium at 80-90 ℃.
5. The catalyst according to claim 1, wherein in the step (2), the reaction temperature is controlled to be 80 to 90 ℃.
6. The catalyst as claimed in claim 1, wherein in the step (4), the carrier is preheated to 230 ℃ and 250 ℃ before spraying; the roasting condition is that the temperature is kept for 30 minutes at 250 ℃, and then the temperature is continuously increased to 480 ℃ for roasting for 2 hours.
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| CN108421544B (en) * | 2018-04-24 | 2021-04-13 | 鹏辰新材料科技股份有限公司 | Preparation of three-dimensional double-continuous-hole catalyst and application of catalyst in durene |
| CN108686686A (en) * | 2018-05-09 | 2018-10-23 | 常熟理工学院 | It is used to prepare vanadium-boron-tin-na oxide catalyst of pyromellitic acid anhydride |
| CN109336900A (en) * | 2018-11-19 | 2019-02-15 | 鹏辰新材料科技股份有限公司 | Pyromellitic acid anhydride preparation method based on modified vanadium titanium oxide composite catalyzing |
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| CN1213584A (en) * | 1997-10-03 | 1999-04-14 | 株式会社日本触媒 | Catalyst for catalytic oxidation use |
| CN1232033A (en) * | 1998-03-17 | 1999-10-20 | 株式会社日本触媒 | Production process for pyromellitic dianhydride |
| CN102319580A (en) * | 2011-06-14 | 2012-01-18 | 常熟理工学院 | Catalyst and preparation method thereof |
| CN102626648A (en) * | 2012-03-20 | 2012-08-08 | 常熟市联邦化工有限公司 | Preparation of pyromellitic dianhydride (PMDA) multi-component oxide catalyst through catalytic gas phase oxidation method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1213584A (en) * | 1997-10-03 | 1999-04-14 | 株式会社日本触媒 | Catalyst for catalytic oxidation use |
| CN1232033A (en) * | 1998-03-17 | 1999-10-20 | 株式会社日本触媒 | Production process for pyromellitic dianhydride |
| CN102319580A (en) * | 2011-06-14 | 2012-01-18 | 常熟理工学院 | Catalyst and preparation method thereof |
| CN102626648A (en) * | 2012-03-20 | 2012-08-08 | 常熟市联邦化工有限公司 | Preparation of pyromellitic dianhydride (PMDA) multi-component oxide catalyst through catalytic gas phase oxidation method |
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