CN1048197C - Maleic anhydride catalyst with heavy rare earth oxide and its application - Google Patents
Maleic anhydride catalyst with heavy rare earth oxide and its application Download PDFInfo
- Publication number
- CN1048197C CN1048197C CN94107337A CN94107337A CN1048197C CN 1048197 C CN1048197 C CN 1048197C CN 94107337 A CN94107337 A CN 94107337A CN 94107337 A CN94107337 A CN 94107337A CN 1048197 C CN1048197 C CN 1048197C
- Authority
- CN
- China
- Prior art keywords
- benzene
- catalyzer
- catalyst
- rare earth
- heavy rare
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Catalysts (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Abstract
The present invention relates to a spherical carrier catalyst with heavy rare earth oxide, which is used for producing cis-butenedioic anhydride in a fixed bed by oxidizing benzene. The present invention is made by spraying solution which is composed of active substances on a spherical carrier surface which takes silicon carbide as skeleton particles. The active substances comprise vanadium, molybdenum, phosphorus, sodium, nickel and heavy rare earth oxide. The mol ratio of all constituents is that V2O5: MoO3: P2O5: Na2O: NiO: R2O3 is 0.30 to 0.90: 0.005 to 0.100: 0.01 to 0.20: 0.005 to 0.050: 0.0001 to 0.0080, and the R2O3 can be selected from the oxide of gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, etc. The content of the active substances in the catalyst of the present invention is from 13% to 21%, and benzene carrying capacity can be improved to 105 to 135 g/l (catalysts). hr.
Description
The invention belongs to organic synthesis heterogeneous catalyst field
MALEIC ANHYDRIDE (abbreviation cis-butenedioic anhydride) is important Organic Chemicals, is mainly used in to produce synthetic resins, agricultural chemicals, medicine, papermaking etc.In nineteen ninety, we are to a patent of invention CN90107749.6 (publication number: CN1060042A of Patent Office of the People's Republic of China's application, open day: 1992.4.8), set forth strong, active high, selectivity is good, yield the is high carried catalyst of a kind of anti-sulphur ability, purpose is at external catalyzer the shortcoming of thiophene content requirement harshness in the benzene feedstock to be carried out study on the modification.The present invention is on this invention basis, introducing the heavy rare earth metal element is that heavy rare earth metal oxide is in the catalyst activity component, and use with the ball-type carrier of silicon carbide as main component, reach the remarkable catalyst performance that improves, improve the purpose of benzene lifting capacity and cis-butenedioic anhydride throughput.As the embodiment that puts down in writing among the Chinese patent CN90107749.6, its catalyzer is used for the reaction process that benzene prepares cis-butenedioic anhydride, and the cis-butenedioic anhydride weight yield is 90～97.5%, and the benzene lifting capacity is lower, is 84～88 gram benzene/rise catalyzer hour.
According to the literature (Ж. Φ .X., 55[8], 2121 (1981) .), in the V-Mo-O of benzene preparing cis-butenedioic anhydride by oxidation catalyzer, add rare-earth oxide, can improve the reactivity worth of catalyzer, promptly improve transformation efficiency, selectivity and yield of maleic anhydride, thereby improve the throughput of cis-butenedioic anhydride.What (a) that rare-earth oxide big or small available per hour every liter of catalyzer of role in catalyzer obtains cis-butenedioic anhydride represent (unit be mmole cis-butenedioic anhydride/rise catalyzer hour):
| Additive (being the oxide compound of rare earth element) | / La Pr Nd Sm Eu Gd Tb Dy Ho Er Lu |
| a | 200 230 / 650 300 670 910 1000 1090 / 900 / |
Show that by above-mentioned numeral all rare-earth oxides all have promoter action to catalyst performance, but it varies in size.Press the tactic rare-earth oxide of ordination number, it is earlier ascending to the promoter action of catalyzer, and descending, forms periodic Changing Pattern.As from La to Sm and from Sm to Lu, a value is ascending, descending more periodically variation; Locate to occur maximum value at (Pr, Nd) and (Tb, Dy, Ho, Er) respectively again.
The rare earth oxide that the present invention selects comprises the oxide compound of gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium elements such as (Lu), claims that usually these elements are heavy rare earth element.
In addition, there is abundant rare earth resources in China, great variety of goods, total reserves have more than 3,000 ten thousand tons, are about 5 times of external reserves, and have exploitation and separate the synthesis that smelting is machined in one, grasp advanced isolation technique, can produce various rare earth metals and alloy and extension product thereof, therefore, there is not the raw material sources problem in the application of exploitation rare earth metal in cis-butenedioic anhydride production, and significant to development China rare-earth industry.
The preparation technology that catalyzer of the present invention adopts is as follows:
1, the preparation of carrier: with silicon carbide is the carrier framework particle, and low pressure china clay and silicon sol are binding agent, and methylcellulose gum and polypropylene are interim binding agent and pore-forming material.Select raw material according to processing requirement, the granularity that requires silicon carbide is 20～200 orders, and the china clay granularity is 60～300 orders, and methylcellulose gum viscosity is 17～555 centipoises, and the polypropylene granularity is 10～150 orders, and silicon sol is not for containing the acidic silicasol of sodium.The ratio of components of various raw materials is a silicon carbide: china clay: methylcellulose gum: polypropylene: silicon sol=1: (0.10～0.40): (0.04～0.20): (0.06～0.30): (0.10～0.40), best proportioning are 1: (0.15～0.35): (0.06～0.10): (0.10～0.20): (0.17～0.35).
The above-mentioned various materials of proportioning weighing according to the rules mix, and add water and mediate, and place 8～24 hours, and through extrusion, chop the chop, dry and 1250～1400 ℃ of following roastings, naturally cool to room temperature, promptly having made diameter is the spherical porous carrier of φ 5～6.After tested, its physicals is as follows: compressive strength is 3.5～10 kilograms/, and specific surface area (BET assay method) is 0.1～0.5 meter
2/ gram, porosity is 40～55%, Na
2O content≤0.3% (weight).
2, the preparation of actives solution: solid oxalic acid and ammonium meta-vanadate are added in the normal-temperature water, heat while stirring, until dissolving; Add ammonium molybdate solution again; The hydrochloric acid soln that under agitation adds solid phosphoric acid sodium, nickelous nitrate and Erbium trioxide has then successively made cyan actives solution like this.Proportioning between this active ingredient (mol ratio) is Vanadium Pentoxide in FLAKES (V
2O
5): molybdic oxide (MoO
3): Vanadium Pentoxide in FLAKES (P
2O
5): sodium oxide (Na
2O): nickel oxide (NiO): heavy rare earth metal oxide (R
2O
3)=1: (0.30～0.90): (0.005～0.100): (0.01～0.20): (0.005～0.050): (0.0001～0.0080), best proportioning are 1: (0.5～0.7): (0.01～0.05): (0.03～0.08): (0.008～0.030): (0.0002～0.0010).Promotor heavy rare earth metal oxide (R
2O
3) can be from Gd
2O
3, Tb
2O
3, Dy
2O
3, Ho
2O
3, Er
2O
3, Tm
2O
3, Yb
2O
3, Lu
2O
3Deng in select.
3, Preparation of catalysts:
Adopt spraying method, the actives solution spraying of above-mentioned preparation is obtained desired carried catalyst to carrier surface.Its working method: carrier of the present invention is placed in the rotary drum of being furnished with outer heating equipment, by spray gun with the preparation the actives solution spraying to carrier, the rotary drum rotating speed is 10～30 rev/mins, temperature maintenance is at 200～300 ℃, after treating that the catalyzer finished product is cooled to room temperature, weigh airtight preservation, and the content that calculates actives in the catalyzer is 17 ± 4%, and catalyst buildup density is 0.8～1.0 kg/liter.
4, Application of Catalyst and benchmark test:
Adopting loaded catalyst is that 120 milliliters, the height of bed are that 30 centimetres fixed-bed reactor carry out the catalyst performance evaluation test, or to adopt loadings be that 1000 milliliters, the height of bed are that 2600 millimeters fixed-bed reactor carry out Application of Catalyst and benchmark test.Test conditions: salt temperature is 350～370 ℃, and air speed is 1900～3000 hours
-1, benzene concentration is 35～55 gram/rice
3Benzene under catalyst action with air in oxygen molecule generation oxidizing reaction make cis-butenedioic anhydride, the cis-butenedioic anhydride weight yield is 90～100%, selectivity improves, and is 75～85%, the benzene lifting capacity is brought up to 105～135 gram benzene/rise catalyzer hour, cis-butenedioic anhydride throughput improves thereupon.
The advantage of catalyzer of the present invention:
1, catalyzer of the present invention has high reactivity, highly selective; Because rare-earth oxide inherent supraconductivity, semiconduction, magnetic impel the reactivity worth of catalyzer to improve, and make the benzene transformation efficiency more than 99%, reaction end gas can directly discharge without the catalyzer burn processing.
2, catalyzer of the present invention is used for the benzene preparing cis-butenedioic anhydride by oxidation, and the benzene lifting capacity increases, and cis-butenedioic anhydride throughput is than improving 20～30% with former catalyzer (Chinese patent CN90107749.6).
3, catalyzer regularity height of the present invention, filling are easily.
4, use Catalyst Production cis-butenedioic anhydride of the present invention, the soak time of catalyzer is short, reduces investment outlay.
Embodiment 1
Take by weighing 200 gram 60 purpose silicon carbide, 50 respectively and restrained the china clay of 100 mesh sieves, methylcellulose gum, 33.4 grams, 20～40 purpose polypropylene that 16.6 gram viscosity are 17～23 centipoises, then, these solid material are placed on uniform mixing in the barrel; In addition, the silicon sol that to measure 50 milliliters of trades mark be 90-IV is dissolved in 50 ml distilled waters, then, is added in the above-mentioned solid mixture again, stirs, mediates, and places more than 8 hours; At last, put into a forcing machine and be extruded into bar, again it is twisted into ball, treat product oven dry after, placing temperature is that 1280 ± 10 ℃ retort furnace burnt 6.5 hours, naturally cooling, promptly having obtained diameter is the spherical porous carrier of greyish-green of 5～6 millimeters of φ.Measure the physicals of this product, obtain following data: compressive strength is 4 kilograms/, and specific surface area is 0.15 meter
2/ gram, porosity is 52%, Na
2O content is 0.15% (weight).
Embodiment 2
1, preparing carriers: the method according to embodiment 1 makes the spherical permeability support of the catalyst that diameter is φ 5～6.
2, the preparation of actives solution: 38.80 gram oxalic acid under agitation are dissolved in 200 ml waters, add the ammonium meta-vanadate of 31.05 grams again, heat until solids while stirring and all dissolve; Add the aqueous solution that contains 14.10 gram ammonium molybdates then, under agitation add the hydrochloric acid soln that solid phosphoric acid sodium 2.03 restrains, nickelous nitrate 0.3 restrains and contain 0.017 gram Erbium trioxide successively, made blackish green actives solution at last.
3, Preparation of Catalyst: earlier carrier is put into a coating pan that is rotating, the rotating speed of pot is 15 rev/mins, a heating unit is arranged below the coating pan, and kettle temperature is controlled at 250 ± 20 ℃.The actives solution for preparing is sprayed to carrier surface by spray gun, spraying while rotating; Spraying finishes, and takes out blackish green finished product, has just made catalyzer of the present invention.Test and calculation result: active matter content is 17 ± 4% in the catalyzer, and the tap density of catalyzer is 0.85～0.87 kg/liter.
4, the catalyzer use properties is estimated: the employing loadings is 120 milliliters a fixed-bed reactor evaluate catalysts performance.Tube inner diameter is 25 millimeters, and the interpolation external diameter is 5 millimeters a thermocouple sheath, and the catalyzer height of bed is 30 centimetres, is provided with molten salt bath outside the pipe and heats.The operation beginning mixes benzene and preheated air earlier, and gas mixture is 2500 hours in air speed
-1, benzene concentration is 43.4 gram/rice
3Down, enter reactor from the upper end, salt temperature is 365 ± 2 ℃, and under catalyst action of the present invention, oxygen molecule generation oxidizing reaction in benzene and the air generates gas and discharges from the lower end, enters atmosphere after catch captures cis-butenedioic anhydride.Carry out bypass sampling analysis and calculating in reactor outlet threeway place, the gained data are as follows: the benzene transformation efficiency is 98.29%, and selectivity is 79.04%, and the cis-butenedioic anhydride weight yield is 97.51%, and the benzene lifting capacity is 108.5 gram benzene/rise catalyzer hour.
Embodiment 3
1, preparing carriers: adopt the preparation technology identical to produce spherical porous carrier in batches with embodiment 1.
2, the preparation of actives solution: adopt the method identical to prepare actives solution with embodiment 2.Each add-on of preparing burden is respectively oxalic acid 299.32 grams, ammonium meta-vanadate 239.53 grams, ammonium molybdate 108.77 grams (being dissolved in 240 ml waters). and sodium phosphate 15.66 grams, nickelous nitrate 3.08 restrain and contain the hydrochloric acid soln of 0.1319 gram Erbium trioxide.During preparation, earlier oxalic acid under agitation is dissolved in 960 ml waters, adds ammonium meta-vanadate again, heating is all dissolved until solids while stirring; Add ammonium molybdate solution again, and add solid phosphoric acid sodium, nickelous nitrate and Erbium trioxide hydrochloric acid soln successively, stir and all dissolve, obtained blackish green actives solution at last until solids.
3, Preparation of Catalyst: identical with embodiment 2.
4, the catalyzer use properties is estimated: with the catalyzer of the present invention caliber of packing into is that φ 30 * 3, length are in 3 meters the stainless steel single tube fixed-bed reactor, loaded catalyst is 1000 milliliters, the height of bed is 2600 millimeters, be inserted with the thermocouple sheath of a φ 5 * 1 in the reaction tubes, pipe external application molten salt bath heating, fused salt recycles.Benzene enters reactor from the upper end, and oxidizing reaction generation MALEIC ANHYDRIDE takes place under catalyst action oxygen molecule in benzene and the air, and reaction generates gas and discharges from the lower end, and the water absorption bottle captures MALEIC ANHYDRIDE.Reaction conditions is air speed 2500 hours
-1, benzene concentration 52.48 gram/rice
3, 366 ℃ of salt temperatures.Calculate after measured: yield of maleic anhydride is that 95.94% (weight), catalyst selectivity are 79.36%, and the benzene lifting capacity is 131.20 gram benzene/rise catalyzer hour.
Embodiment 4
This example is the application of catalyzer of the present invention on the benzene preparing cis-butenedioic anhydride by oxidation production equipment of 700 tons of annual outputs.Adopt one to be that the fixed-bed reactor that 25 millimeters carbon steel tubulations are formed are tested, four movably thermocouple measurement temperature of reaction are housed on the different positions of reactor, also have two thermopairs of measuring temperature of molten salt by 1170 internal diameters.Operate as follows: at first reactor is carried out Passivation Treatment, with in the tubulation of catalyst loading of the present invention in reactor, the loadings of catalyzer is 1.16 tons then, and bed height is 2.60 ± 0.05 meters.Ready, with pump water to be squeezed in the benzene feedstock jar, the benzene of extrusion is after the spinner-type flowmeter metering, enter the air mixed of Venturi vaporizer and process preheating, mixed gas enters from the upper end of reactor, carries out oxidizing reaction under catalyst action, and benzene concentration is 46.4～50.1 gram/rice
3, air speed is 2200～2500 hours
-1, the outer temperature of molten salt of tubulation is 360 ± 2 ℃, reacted gas is flowed out by the lower end of reactor, goes air preheater to carry out heat exchange; The reaction generation gas of having lowered the temperature enters Venturi absorber and the water absorption is carried out on eddy flow Ban Shui absorption tower, becomes maleic acid liquid, and the tail gas behind the absorption cis-butenedioic anhydride enters atmosphere from cat head.Collect in the total acid water pot along acid solution, reach finite concentration after, squeeze into pump that treatment and finishing section dewaters, rectifying, obtain the white solid thing at last, be cis-butenedioic anhydride.Fused salt in the fused salt case recycles.Catalyzer of the present invention has moved 6 months continuously on the cis-butenedioic anhydride industrial installation, obtain following result: the benzene transformation efficiency is 98.9～99.6%, and the cis-butenedioic anhydride weight yield is 90～91.6%
*, the benzene lifting capacity is 112.2 gram benzene/rise catalyzer hour.Cis-butenedioic anhydride quality product after the purification meets State Standard of the People's Republic of China GB3673-73 first grade standard.
* annotate: do not comprise the cis-butenedioic anhydride amount that tail gas is taken away, be about 0.5% (weight).
Claims (4)
1. one kind is used for fixing a carried catalyst of benzene oxidation production MALEIC ANHYDRIDE, it is characterized in that support of the catalyst is is the porous inert material of skeleton particle with silicon carbide, its profile is the spheroplast of diameter of phi 5-6, compressive strength is 3.5-10 kilogram/grain, is 0.1-0.5 rice with BET assay method measurement the specific area
2/ gram, porosity is 40-55%, Na
2O content by weight≤0.3%; Catalyst activity component is by Vanadium Pentoxide in FLAKES (V
2O
5), molybdic oxide (MoO
3), Vanadium Pentoxide in FLAKES (P
2O
5), sodium oxide (Na
2O), nickel oxide (NiO) and heavy rare earth metal oxide (R
2O
3) form, the mol ratio between each component is V
2O
5: MoO
3: P
2O
5: Na
2O: NiO: R
2O
3=1: (0.30-0.90): (0.005-0.100): (0.01-0.20): (0.005-0.050): (0.0001-0.0080); Promotor R
2O
3Be selected from heavy rare earth metal oxide Gd
2O
3, Tb
2O
3, Dy
2O
3, Ho
2O
3, Er
2O
3, Tm
2O
3, Yb
2O
3, Lu
2O
3Adopt spraying method, under 200-300 ℃, will promptly make catalyzer according to the active constituent solution spraying of processing requirement preparation to the porous support surface; In this carried catalyst, active matter content is 17 ± 4% by weight, and catalyst buildup density is the 0.8-1.0 kg/liter.
2. according to the catalyzer described in the claim 1, it is characterized in that carrier is is raw material with silicon carbide, china clay, methylcellulose gum, polypropylene, silicon sol, through kneading, extrusion, chop the chop, oven dry, roasting and make.
3. catalyzer according to claim 1 and 2 is characterized in that preparing the raw materials used ratio of components of carrier and is silicon carbide by weight: china clay: methylcellulose gum: polypropylene: silicon sol=1: (0.10-0.40): (0.04-0.20): (0.06-0.30): (0.10-0.40).
4. the application of the described catalyzer of claim 1 in the benzene preparing cis-butenedioic anhydride by oxidation is produced is characterized in that, adopts fixed-bed tube reactor, and the benzene lifting capacity is 105-135 gram benzene/a rise catalyzer hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94107337A CN1048197C (en) | 1994-07-05 | 1994-07-05 | Maleic anhydride catalyst with heavy rare earth oxide and its application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94107337A CN1048197C (en) | 1994-07-05 | 1994-07-05 | Maleic anhydride catalyst with heavy rare earth oxide and its application |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1106714A CN1106714A (en) | 1995-08-16 |
| CN1048197C true CN1048197C (en) | 2000-01-12 |
Family
ID=5032959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94107337A Expired - Lifetime CN1048197C (en) | 1994-07-05 | 1994-07-05 | Maleic anhydride catalyst with heavy rare earth oxide and its application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1048197C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107999107A (en) * | 2016-10-28 | 2018-05-08 | 中国石油化工股份有限公司 | A kind of maleic anhydride catalyst and its preparation method and application |
| CN109201095A (en) * | 2017-07-04 | 2019-01-15 | 中国石油化工股份有限公司 | A kind of benzene oxidatoin catalyst for preparing cis-anhydride and the preparation method and application thereof |
| CN107597159B (en) * | 2017-09-12 | 2020-06-12 | 山西大学 | Catalyst for preparing succinic anhydride by maleic anhydride hydrogenation and preparation method thereof |
| CN112439435A (en) * | 2019-08-28 | 2021-03-05 | 中国石油化工股份有限公司 | Catalyst for preparing maleic anhydride by benzene oxidation, preparation method and application |
| CN114100651B (en) * | 2020-08-25 | 2023-12-08 | 中国石油化工股份有限公司 | Catalyst for preparing maleic anhydride by benzene oxidation and preparation method and application thereof |
| CN114100623B (en) * | 2020-08-26 | 2023-12-08 | 中国石油化工股份有限公司 | Catalyst for improving selectivity of maleic anhydride prepared by benzene oxidation and preparation method and application thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3101507A1 (en) * | 1976-08-23 | 1982-09-02 | Viktor Grigor'evič Širokov | Catalyst for the oxidation of benzene to give maleic anhydride |
| SU333793A1 (en) * | 1970-08-10 | 1983-07-23 | Lyubarskij A G | Method for preparing catalyst |
| CN1060042A (en) * | 1990-09-19 | 1992-04-08 | 中国石油化工总公司 | maleic anhydride catalyst and application thereof |
| CN1020453C (en) * | 1985-03-26 | 1993-05-05 | 日本触媒化学工业株式会社 | Process for producing maleic anhydride |
-
1994
- 1994-07-05 CN CN94107337A patent/CN1048197C/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU333793A1 (en) * | 1970-08-10 | 1983-07-23 | Lyubarskij A G | Method for preparing catalyst |
| DE3101507A1 (en) * | 1976-08-23 | 1982-09-02 | Viktor Grigor'evič Širokov | Catalyst for the oxidation of benzene to give maleic anhydride |
| CN1020453C (en) * | 1985-03-26 | 1993-05-05 | 日本触媒化学工业株式会社 | Process for producing maleic anhydride |
| CN1060042A (en) * | 1990-09-19 | 1992-04-08 | 中国石油化工总公司 | maleic anhydride catalyst and application thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1106714A (en) | 1995-08-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101291757B1 (en) | Method for producing a nanocrystalline bismuth-molybdenum mixed oxide | |
| CN1024003C (en) | Method for manufacture of phthalic anhydride | |
| CN102451702B (en) | Acrylic acid catalyst prepared by acrolein oxidation and preparation method thereof | |
| EP1452227B1 (en) | Process for production of acrylic acid using a composite oxide catalyst | |
| CN1792443A (en) | Catalysts for oxidation of methanol to formaldehyde | |
| BRPI0200854B1 (en) | catalyst for the preparation of methacrolein and methacrylic acid or acrolein and acrylic acid, and process for the catalytic vapor phase oxidation of isobutylene, tertiary butanol or propylene | |
| CN1048197C (en) | Maleic anhydride catalyst with heavy rare earth oxide and its application | |
| EP3275548A1 (en) | Method for producing catalyst and method for producing unsaturated nitrile | |
| CN102527419A (en) | Method for preparing m-phthalodinitrile catalyst through ammoxidation | |
| CN109201095A (en) | A kind of benzene oxidatoin catalyst for preparing cis-anhydride and the preparation method and application thereof | |
| CN103896807A (en) | Preparation method of terephthalonitrile through ammonium oxidation | |
| CN108136377A (en) | Conjugated diene catalyst for producing and its manufacturing method | |
| EP3450018B1 (en) | Production method for ammoxidation catalyst and production method for acrylonitrile | |
| CN107666959A (en) | The method that the multielement oxide of bismuth-containing and tungstenic is prepared by coprecipitation | |
| CN110639492A (en) | Catalyst for preparing methyl acrylate from methyl acetate and formaldehyde and application thereof | |
| JP2003507180A (en) | Fluidized bed catalyst for the ammoxidation of propylene to acrylonitrile. | |
| CN101121130B (en) | Ammoxidation method to manufacturing unsaturated nitrile catalyst | |
| CN1060042A (en) | maleic anhydride catalyst and application thereof | |
| CN106694023A (en) | Catalyst for synthesizing p-hydroxybenzonitrile (2-hydroxybenzonitrile) and preparation method of catalyst | |
| EP3778541A1 (en) | Method for producing at least one of unsaturated aldehyde and unsaturated carboxylic acid, and catalyst for production of at least one of unsaturated aldehyde and unsaturated carboxylic acid | |
| CN1097556C (en) | Process for production of prussic acid | |
| JP4889149B2 (en) | Catalyst for acrylonitrile production | |
| CN113713824B (en) | Catalyst for preparing methacrolein by selective oxidation and preparation method and application thereof | |
| CN1903845A (en) | Preparation method of 3-cyanopyridine | |
| CN102219710A (en) | Method for preparing cyanobenzene |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20140705 Granted publication date: 20000112 |