CN102000596B - Catalyst for preparing pyromellitic dianhydride from durene through gaseous catalytic oxidation and preparation method thereof - Google Patents
Catalyst for preparing pyromellitic dianhydride from durene through gaseous catalytic oxidation and preparation method thereof Download PDFInfo
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- CN102000596B CN102000596B CN201010543303XA CN201010543303A CN102000596B CN 102000596 B CN102000596 B CN 102000596B CN 201010543303X A CN201010543303X A CN 201010543303XA CN 201010543303 A CN201010543303 A CN 201010543303A CN 102000596 B CN102000596 B CN 102000596B
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Abstract
The invention relates to a catalyst for preparing pyromellitic dianhydride from durene through gaseous catalytic oxidation and a preparation method thereof, belonging to the technical field of catalytic oxidation. The catalyst is characterized by comprising V2O5, TiO2 and P2O5, wherein the molar ratio of V2O5 to TiO2 to P2O5 is 1:3.750-15.000:0.125-0.313. The catalyst provided by the invention has the advantages of low airspeed, low energy consumption, high selectivity and high weight gain percentage during application, is helpful to energy saving and resource consumption reduction and is beneficial to increasing the yield and the purity of pyromellitic dianhydride and reducing the production cost for preparing pyromellitic dianhydride through gaseous catalytic oxidation. The provided preparation method of the catalyst has simple and succinct technological steps and can ensure the overall embodiment of the effect of the catalyst.
Description
Technical field
The invention belongs to the catalytic oxidation technical field, relate to and a kind ofly produce the catalyst that pyromellitic acid anhydride is used, and relate to this Preparation of catalysts method by the durol catalytic gas phase oxidation.
Background technology
Pyromellitic acid anhydride (Pyromellitic Dianhydride; Be called for short PMDA and then be called for short equal acid anhydride) be a kind of important organic chemical industry's product intermediate with high added value; It is mainly used in production engineering plastics, coating additive, plastic additive and binding agent etc., is widely used in numerous areas such as electromechanics, aerospace and electronics industry owing to PMDA has excellent insulating properties, high and low temperature resistance and mechanical performance.
The industrial process of PMDA has multiple, like gas phase air catalytic oxidation method, liquid-phase air oxidation, nitric acid oxidation method and chromic acid oxidation etc., but is main with the catalytic gas phase oxidation method.Because the catalytic gas phase oxidation method is a raw material with durol (durene) mainly, directly make equal acid anhydride without dehydration, it is simple therefore to have technology; Production cost is relatively low; Being easy to automation mechanized operation, being fit to many advantages such as commercial production, is the main flow technology of producing PMDA in the world at present.
Catalyst is the core that the catalytic gas phase oxidation legal system is equipped with PMDA.In the technology of preparation catalyst, known technology adopts and passes through TiCl
4Or (C
4H
9O)
4Catalyst activity component TiO is obtained in the decomposition of Ti
2Yet through TiCl
4Or (C
4H
9O)
4TiO is produced in the Ti decomposition
2The time, need control TiO through certain process conditions
2Crystal habit, thereby make the process conditions relative complex and the harshness of preparation; Simultaneously, the catalyst weightening finish that this preparation technology produces is relatively low, thus the service life of having reduced catalyst.In addition, TiCl
4Itself have volatility and excitant, unstable chemcial property has certain corrosivity to Preparation of catalysts equipment; (C
4H
9O)
4The price of Ti is comparatively expensive, has caused increasing of production cost.Therefore seek a kind of alternative titanium source and become the key factor in the new catalyst research and development.
The durol catalytic gas phase oxidation process of preparation PMDA is the heterogeneous catalysis process of a complicacy; Because in the catalytic oxidation process, durol also can generate many accessory substances except can oxidized generation PMDA; Like trimellitic anhydride (Trimellitic Anhydride; Abbreviation TMA), phthalic anhydride (Phthalic Anhydride is called for short PA) and maleic anhydride (Maleic anhydride is called for short MAA) etc.; And the existence of accessory substance has not only reduced the purity of PMDA, and makes refining separate complexization.Yet, select for use have high-efficiency catalytic activity and optionally catalyst not only can improve yield and the purity of PMDA effectively, and oversimplified exquisite the separation.Therefore, the research and development of efficient catalyst has crucial value.
Japan Patent JP 6202704 has invented the catalyst of a kind of PMDA of preparation, and catalytic active component is respectively the V of 1%-80% quality
2O
5, the TiO of 9%-20% quality
2, the P of 0.02%-10% quality
2O
5Sb with the 0.1%-30% quality
2O
3Though this catalyst has catalytic activity preferably, owing to use titanium tetrachloride as the titanium source, and the furnace temperature of having relatively high expectations, thereby the consumption that has increased the energy, improved production cost.
The V that Japan Patent JP 45-15252 delivers
2O
5-TiO
2-Na
2O or V
2O
5-TiO
2-Na
2O-P
2O
5Catalyst has been applied in the commercial production that the durol catalytic gas phase oxidation prepares PMDA, but requires high-speed, about 14000-16000h
-1, and yield is relatively low, weight yield is 82%-98%, and is in addition, also relatively low through the purity of the PMDA of this catalyst oxidation preparation.
U.S.pat.No.6084109 discloses a kind of V
2O
5-WO
3System Catalyst, co-catalyst comprise the oxide of manganese, antimony, bismuth, phosphorus, copper, aluminium, titanium or its mixture, a kind of oxide of element in the periodic table of elements VIIIB family, the oxide of alkali metal or alkaline-earth metal.This System Catalyst active component is various, preparation technology's relative complex, and the high-speed of the about 6000-10000h-1 of needs, the yield of PMDA is also lower simultaneously, and weight yield is merely 84%-100%.
Chinese patent CN 1321543A discloses a kind of catalyst that PMDA is produced in the durol gaseous oxidation that is used for, and this catalyst is can be by V
2O
5, TiO
2, Nb
2O
5, Cs
2O and P
2O
5The isoreactivity component is formed, also can be by V
2O
5, TiO
2, Nb
2O
5, Na
2O and B
2O
3The isoreactivity component is formed, yet two kinds of its active components of catalyst system and catalyzing are all comparatively complicated, and Nb
2O
5In water, separate, cause in the spraying process catalyst component inhomogeneous easily than indissoluble.Use titanium tetrachloride as the titanium source in addition in the Preparation of catalysts technology, preparation technology is comparatively complicated.
Chinese patent CN 101037439A discloses a kind of carrier model polyoxometallate catalyst, can under the process conditions of low furnace temperature, use, yet the higher air speed of demand is about 4500-6000h
-1In addition, the yield of PMDA and selectivity are also relatively low, and all the weight yield of acid anhydride is about 90%, and purity is about 85%.
Though the production of China PMDA has certain scale at present; Yet owing to receive the factor affecting of research funding and scientific research condition and so on; The catalyst that industry is used still mainly is the vanadium titanium System Catalyst of the development seventies in last century; Its weight yield is about 85%-90%, and purity is about 95%, yet but requires higher relatively air speed and furnace temperature.High-speed, high furnace temperature have restricted the actual production of PMDA, have not only caused energy resource consumption too high, have increased production cost, have also influenced the purity of PMDA simultaneously to a certain extent.In addition, defective such as the production of China PMDA exists technology to fall behind for a long time, thick acid anhydride yield is low and purity is low, simultaneously because the restriction of actual production and process conditions, the yield of PMDA can not get bigger lifting.Therefore; For improving the preparation level of China PMDA; Improve the conversion ratio and the selectivity of catalytic gas phase oxidation, reduce production costs, develop and a kind ofly have low-speed, low fused salt temperature, high yield, high selectivity and energy-conservation catalyst and not only have real but also have long-range positive effect.
Summary of the invention
Top priority of the present invention be to provide a kind of to air speed require low, help energy savings and selectivity is high, and can improve pyromellitic acid anhydride yield and purity produce the catalyst that pyromellitic acid anhydride is used by the durol catalytic gas phase oxidation.
Another task of the present invention is to provide a kind of and produces the Preparation of catalysts method that pyromellitic acid anhydride is used by the durol catalytic gas phase oxidation, and preparation technology is simple for this method, and preparation cost is low and can ensure comprehensive embodiment of catalyst effect.
Top priority of the present invention is done in such a way that a kind ofly produces the catalyst that pyromellitic acid anhydride is used by the durol catalytic gas phase oxidation, and be characterised in that: it is by V
2O
5, TiO
2And P
2O
5Constitute, wherein, V
2O
5, TiO
2And P
2O
5Mol ratio be: 1: 3.750-15.000: 0.125-0.313.
TiO described in the present invention
2Be anatase titanium dioxide TiO
2
Another task of the present invention is accomplished like this, a kind ofly produces the Preparation of catalysts method that pyromellitic acid anhydride is used by the durol catalytic gas phase oxidation, may further comprise the steps:
A) produce oxalic acid vanadyl ammonium salt solution, take by weighing oxalic acid and place and fill distilled water and container that have heater and agitator, stir and heat up; And control intensification temperature; Treat that oxalic acid dissolves the back fully and adds ammonium metavanadate, and continue to stir that reaction obtains oxalic acid vanadyl ammonium salt solution;
B) produce spray coating liquor, press V
2O
5: TiO
2: P
2O
5Mol ratio be: 1: 3.750-15.000: 0.125-0.313 is with (NH
4)
2VO
3, TiO
2(NH
4)
2HPO
4Join in the oxalic acid vanadyl solution, and stir, obtain spray coating liquor;
C) spraying sprays to spray coating liquor on the inert carrier equably, and the control spraying temperature;
D) roasting is inserted activation in the Muffle furnace with the inert carrier that is coated with spray coating liquor, and heats up stage by stage and step heat preservation, and after cooling off with stove, coming out of the stove obtains producing the catalyst that pyromellitic acid anhydride is used by the durol catalytic gas phase oxidation.
In a concrete embodiment of the present invention, steps A) oxalic acid described in and the mol ratio of distilled water are 1: 21-23; The mol ratio of described oxalic acid and ammonium metavanadate is 1: 0.4-0.5.
In another concrete embodiment of the present invention, steps A) the control intensification temperature described in is that the intensification temperature is controlled to be 60-90 ℃.
In another concrete embodiment of the present invention, oxalic acid vanadyl ammonium salt solution and TiO
2Weight ratio is about 4.6: 1.
In another concrete embodiment of the present invention, step C) and step D) described in inert carrier be the SiC ball of diameter 4-6mm or the porcelain ring that diameter is similarly 4-6mm.
Also have among the concrete embodiment step C of the present invention) described in the control spraying temperature be that temperature is controlled to be 220-260 ℃.
In of the present invention and then concrete embodiment, step D) intensification stage by stage and step heat preservation described in are meant insulation 30-60min when furnace temperature rises to 240-260 ℃, are incubated 60-360min when then furnace temperature being risen to 480-560 ℃ once more.
Catalyst provided by the invention has the high advantage of low-speed, low energy consumption, high selectivity and rate of body weight gain when using; Help conserve energy and reduce resource consumption; Help improving the yield and the purity of pyromellitic acid anhydride, reduce the production cost that catalytic gas phase oxidation is produced pyromellitic acid anhydride; The Preparation of catalysts method processing step that provides is terse and can ensure comprehensive embodiment of the said effect of catalyst.
The specific embodiment
Utilize that of the present invention to produce the reaction equation of the Preparation of Catalyst pyromellitic acid anhydride that pyromellitic acid anhydride uses by the durol catalytic gas phase oxidation as follows.
1,2,4, the 5-durene; The durol pyromellitic acid anhydride
1，2，4，5-Tetramethylbenzene PMDA
In catalyst of the present invention, TiO
2(titanium white powder) is as the catalyst activity component.Catalyst has the characteristics of low furnace temperature, low-speed, high selectivity; And weightening finish is high; Solved that the traditional catalyst rate of body weight gain is low, the defective of poor selectivity, simplified relative complex and harsh catalyst preparation process, reduced the consumption of energy and resource; Reduce the production cost of PMDA, had important industrial application value.V
2O
5-TiO
2-P
2O
5System Catalyst has excellent catalytic activity, is 4000-4600h in space-time speed
-1, furnace temperature 375-385 ℃, durol reaction hot(test)-spot temperature is that the highest weight yield of PMDA can reach 99%-105% under 440-450 ℃ the condition, the purity of PMDA is more than 97%.This System Catalyst weightening finish height, favorable reproducibility, stability height are that a kind of new and effective vapour phase oxidation process prepares the PMDA catalyst in addition.
Catalyst involved in the present invention can reach catalytic activity preferably under process conditions such as lower air speed and furnace temperature.Among the preparation technology of PMDA, the reduction of space-time speed can reduce power consumption, reduces production costs.In space-time speed is 3500-4500h
-1, furnace temperature 375-385 ℃, durol reaction hot(test)-spot temperature is that the weight yield of PMDA can reach 96%-101% under 440-450 ℃ the condition, the purity of PMDA is more than 95.5%.The reduction of furnace temperature can reduce temperature of molten salt, has reduced the consumption of electric power energy, has increased load simultaneously, has improved the output of PMDA.In space-time speed is 4000-4600h
-1, furnace temperature 355-375 ℃, durol reaction hot(test)-spot temperature is that the load of catalyst can reach 60-80g/Lh under 440-450 ℃ the condition, and the weight yield of PMDA can reach 97%-103%, and the purity of PMDA is more than 95.5%.In order to reach the catalyst research and development purpose of low-speed, low furnace temperature, find in space-time speed to be 3500-4500h through systematic research
-1, furnace temperature 365-375 ℃, durol reaction hot(test)-spot temperature is that the weight yield of PMDA can reach 95%-100% under 440-450 ℃ the condition, the purity of PMDA is more than 95.0%.Therefore, catalyst involved in the present invention has the advantage of efficient energy-saving, has reduced energy resource consumption, has reduced production cost.
Embodiment 1:
A) produce oxalic acid vanadyl ammonium salt solution, the mol ratio of oxalic acid and distilled water is by 1: 21, with the oxalic acid input that takes by weighing fill distilled water and container that be furnished with heater and agitator in; Stirring is warming up to 90 ℃; After treating that oxalic acid fully promptly dissolves fully, slowly add ammonium metavanadate, the mol ratio of ammonium metavanadate and oxalic acid is 0.4: 1; Continue stirring reaction, obtain oxalic acid vanadyl ammonium salt solution;
B) produce spray coating liquor, according to V
2O
5: TiO
2(anatase titanium dioxide): P
2O
5Mol ratio=1: 3.8: 0.125 with (NH
4)
2VO
3, TiO
2(NH
4)
2HPO
4Join by steps A) in the oxalic acid vanadyl ammonium salt solution that obtains, oxalic acid vanadyl ammonium salt solution and TiO
2Weight be 4.6: 1 and stir, obtain spray coating liquor;
C) spraying will be by step B) spray coating liquor that obtains under 260 ℃, spray to equably as inert carrier and diameter be the SiC spherome surface of 4-6mm, thereby supporting spray coating liquor by the SiC spheroid, rate of body weight gain is 10-15wt%;
D) roasting; Insert in the Muffle furnace being coated with the SiC spheroid that spray coating liquor promptly supporting spray coating liquor; Insulation 60min when being warming up to 240 ℃; Insulation 60min when again furnace temperature being risen to 560 ℃ cools to room temperature with the furnace after roasting finishes, and obtains after coming out of the stove being loaded in producing the catalyst that pyromellitic acid anhydride is used by the durol catalytic gas phase oxidation on the SiC spheroid.
Will be by step D) the 50ml catalyst that obtains puts into the fixed bed reaction pipe of Φ 25mm, and control reaction hot(test)-spot temperature feeds durol at 440-450 ℃, uses air to carry out oxidation, reacts 2 hours.Catalyst loading 55-65g/Lh, air speed 4000-4600h
-1, furnace temperature 375-385 ℃, the weight yield of PMDA is 99%-105%, purity is more than 97.0%.
Embodiment 2:
A) produce oxalic acid vanadyl ammonium salt solution, the mol ratio of oxalic acid and distilled water is by 1: 23, with the oxalic acid input that takes by weighing fill distilled water and container that be furnished with heater and agitator in; Stirring is warming up to 60 ℃; After treating that oxalic acid fully promptly dissolves fully, slowly add ammonium metavanadate, the mol ratio of ammonium metavanadate and oxalic acid is 0.5: 1; Continue stirring reaction, obtain oxalic acid vanadyl ammonium salt solution;
B) produce spray coating liquor, according to V
2O
5: TiO
2(anatase titanium dioxide): P
2O
5Mol ratio=1: 15: 0.313 with (NH
4)
2VO
3, TiO
2(NH
4)
2HPO
4Join by steps A) in the oxalic acid vanadyl ammonium salt solution that obtains, wherein, oxalic acid vanadyl ammonium salt solution and TiO
2Weight ratio be 4.6: 1, and stir, obtain spray coating liquor;
C) spraying will be by step B) spray coating liquor that obtains under 220 ℃, spray to equably as inert carrier and diameter be the porcelain ring surface of 4-6mm, thereby supporting spray coating liquor by the porcelain ring, rate of body weight gain is 10-15wt%;
D) roasting; Insert in the Muffle furnace being coated with the porcelain ring body that spray coating liquor promptly supporting spray coating liquor; Insulation 30min when being warming up to 260 ℃; Insulation 360min when again furnace temperature being risen to 480 ℃ cools to room temperature with the furnace after roasting finishes, and obtains after coming out of the stove being loaded in producing the catalyst that pyromellitic acid anhydride is used by the durol catalytic gas phase oxidation on the porcelain ring.
Will be by step D) the 50ml catalyst that obtains puts into the fixed bed reaction pipe of Φ 25mm, and control reaction hot(test)-spot temperature feeds durol at 440-450 ℃, uses air to carry out oxidation, reacts 2 hours.Catalyst loading 45～55g/Lh, air speed 3500～4500h
-1, 375～385 ℃ of furnace temperature, the weight yield of PMDA is 96%～101%, purity is more than 95.5%.
Embodiment 3:
To prepare catalyst and evaluation of catalyst activity with instance 2 same methods; The 50ml catalyst that obtains is put into the fixed bed reaction pipe of Φ 25mm, and control reaction hot(test)-spot temperature feeds durol at 440-450 ℃; Use air to carry out oxidation, reacted 2 hours.Catalyst loading 60～80g/Lh, air speed 4000～4600h
-1, 355～375 ℃ of furnace temperature, the weight yield of PMDA is 97%～103%, purity is more than 95.5%.
Embodiment 4:
To prepare catalyst and evaluation of catalyst activity with instance 2 same methods; The 50ml catalyst that obtains is put into the fixed bed reaction pipe of Φ 25mm, and control reaction hot(test)-spot temperature feeds durol at 440-450 ℃; Use air to carry out oxidation, reacted 2 hours.Catalyst loading 60～70g/Lh, air speed 3500～4500h
-1, 365～375 ℃ of furnace temperature, the weight yield of PMDA is 95%～100%, purity is more than 95.0%.
Claims (7)
1. produce the Preparation of catalysts method that pyromellitic acid anhydride is used by the durol catalytic gas phase oxidation for one kind, it is characterized in that may further comprise the steps:
A) produce oxalic acid vanadyl ammonium salt solution, take by weighing oxalic acid and place and fill distilled water and container that have heater and agitator, stir and heat up; And control intensification temperature; Treat that oxalic acid dissolves the back fully and adds ammonium metavanadate, and continue to stir that reaction obtains oxalic acid vanadyl ammonium salt solution;
B) produce spray coating liquor, press V
2O
5: TiO
2: P
2O
5Mol ratio be: 1: 3.750-15.000: 0.125-0.313 is with (NH
4)
2VO
3, TiO
2(NH
4)
2HPO
4Join in the oxalic acid vanadyl ammonium salt solution, and stir, obtain spray coating liquor;
C) spraying sprays to spray coating liquor on the inert carrier equably, and the control spraying temperature;
D) roasting is inserted activation in the Muffle furnace with the inert carrier that is coated with spray coating liquor, and heats up stage by stage and step heat preservation, and after cooling off with stove, coming out of the stove obtains producing the catalyst that pyromellitic acid anhydride is used by the durol catalytic gas phase oxidation.
2. according to claim 1ly produce the Preparation of catalysts method that pyromellitic acid anhydride is used, it is characterized in that steps A by the durol catalytic gas phase oxidation) described in oxalic acid and the mol ratio of distilled water be 1: 21-23; The mol ratio of described oxalic acid and ammonium metavanadate is 1: 0.4-0.5.
3. according to claim 1ly produce the Preparation of catalysts method that pyromellitic acid anhydride is used, it is characterized in that steps A by the durol catalytic gas phase oxidation) described in control intensification temperature be that the intensification temperature is controlled to be 60-90 ℃.
4. according to claim 1ly produce the Preparation of catalysts method that pyromellitic acid anhydride is used, it is characterized in that oxalic acid vanadyl ammonium salt solution and TiO by the durol catalytic gas phase oxidation
2Weight ratio is 4.6: 1.
5. according to claim 1ly produce the Preparation of catalysts method that pyromellitic acid anhydride is used, it is characterized in that step C by the durol catalytic gas phase oxidation) and step D) described in inert carrier be the SiC ball of diameter 4-6mm or the porcelain ring that diameter is similarly 4-6mm.
6. according to claim 1ly produce the Preparation of catalysts method that pyromellitic acid anhydride is used, it is characterized in that step C by the durol catalytic gas phase oxidation) described in the control spraying temperature be that temperature is controlled to be 220-260 ℃.
7. according to claim 1ly produce the Preparation of catalysts method that pyromellitic acid anhydride is used by the durol catalytic gas phase oxidation; It is characterized in that step D) described in intensification stage by stage and step heat preservation be meant insulation 30-60min when furnace temperature rises to 240-260 ℃, be incubated 60-360min when then furnace temperature being risen to 480-560 ℃ once more.
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|---|---|---|---|
| CN201010543303XA CN102000596B (en) | 2010-11-15 | 2010-11-15 | Catalyst for preparing pyromellitic dianhydride from durene through gaseous catalytic oxidation and preparation method thereof |
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| CN102000596B true CN102000596B (en) | 2012-06-06 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102319580B (en) * | 2011-06-14 | 2014-05-28 | 常熟理工学院 | Catalyst and preparation method thereof |
| CN102626648B (en) * | 2012-03-20 | 2014-12-31 | 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 |
| CN104785281B (en) * | 2015-03-26 | 2017-09-26 | 常熟理工学院 | It is a kind of to be used to prepare catalyst of pyromellitic acid dianhydride and preparation method thereof |
| CN107866251B (en) * | 2016-09-23 | 2019-12-10 | 中国石油化工股份有限公司 | Catalyst for preparation of pyromellitic anhydride |
| CN108043435B (en) * | 2017-12-15 | 2020-10-20 | 大连龙想催化化学股份有限公司 | Catalyst for preparing pyromellitic dianhydride by gas-phase oxidation of durene and preparation and application thereof |
| CN108404988A (en) * | 2018-04-24 | 2018-08-17 | 鹏辰新材料科技股份有限公司 | A kind of catalyst and preparation method thereof of pyromellitic acid anhydride and Pyromellitic Acid |
| 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 |
| CN109666032B (en) * | 2018-12-11 | 2020-07-07 | 沾化大荣化工科技有限公司 | Preparation method of pyromellitic anhydride |
| CN111841613B (en) * | 2020-08-18 | 2021-11-02 | 连云港鹏辰特种新材料有限公司 | Composite catalyst with high specific surface area and application thereof in preparation of pyromellitic dianhydride by catalytic oxidation |
| CN115591565B (en) * | 2022-10-23 | 2024-03-19 | 浙江安诺芳胺化学品有限公司 | Method for continuously synthesizing pyromellitic dianhydride and catalyst used in method |
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| CN1104643A (en) * | 1993-02-25 | 1995-07-05 | 电化学工业有限公司（国际） | Process for preparing pyromellitic dianhydride |
| US6084109A (en) * | 1998-07-31 | 2000-07-04 | Chinese Petroleum Corp. | Process for the preparation of pyromellitic dianhydride |
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2010
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1104643A (en) * | 1993-02-25 | 1995-07-05 | 电化学工业有限公司（国际） | Process for preparing pyromellitic dianhydride |
| US6084109A (en) * | 1998-07-31 | 2000-07-04 | Chinese Petroleum Corp. | Process for the preparation of pyromellitic dianhydride |
| CN1321543A (en) * | 2001-04-06 | 2001-11-14 | 陈永和 | Catalyst for preparing pyromellitic acid dianhydride by gas phase oxidation of durene and its preparation method |
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