CN1242972C - Catalyst prepared by using M/Mn/Al hydrotalcite as precursor for producing benzyl formaldehyde by gaseous phase hydrogenation of benzoic acid or methoylbenzoatc - Google Patents
Catalyst prepared by using M/Mn/Al hydrotalcite as precursor for producing benzyl formaldehyde by gaseous phase hydrogenation of benzoic acid or methoylbenzoatc Download PDFInfo
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- CN1242972C CN1242972C CN 03142119 CN03142119A CN1242972C CN 1242972 C CN1242972 C CN 1242972C CN 03142119 CN03142119 CN 03142119 CN 03142119 A CN03142119 A CN 03142119A CN 1242972 C CN1242972 C CN 1242972C
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- methyl benzoate
- hydrogen
- reaction
- phenylformic acid
- hydrotalcite
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Abstract
The present invention relates to a method for generating benzaldehyde by catalyzing the gas-phase hydrogenation of benzoic acid or methyl benzoate by a catalyst prepared from an M/Mn/Al hydrotalcite precursor. The technology does not exist at present. The present invention adopts a coprecipitation method to prepare an M/Mn/Al hydrotalcite precursor, and the M/Mn/Al hydrotalcite precursor is roasted at an air or nitrogen atmosphere to obtain the catalyst with high dispersion and high specific surface. Under the condition of the existence of the catalyst containing Mn, Al, M (M=Mg, Zn, Pb, Ni and Cr) and K metallic elements, an appropriate reactant ratio and a feeding rate are selected at a temperature of 350 to 500 DEG C and a pressure of 0.1 to 1.0MPa, and thus, the conversion rate and the selectivity of generating benzaldehyde by the gas-phase hydrogenation of the benzoic acid or the methyl benzoate reach more than 90%.
Description
Technical field
The present invention be a kind of be that the catalyzer of presoma preparation is used for phenylformic acid or the methyl benzoate gas phase hydrogenation generates method of benzaldehyde with the M/Mn/Al hydrotalcite.
Background technology
Phenyl aldehyde is important fine chemical product and reaction intermediate, is widely used in fields such as medicine, agricultural chemicals, spices, resin additive and dyestuff.One step of vapor phase process, hydrogenation can directly obtain phenyl aldehyde, and this method is simple to operate, and product is purified easily, has caused people's common concern in recent years, has has also researched and developed a series of hydrogenation catalysts in succession.Nineteen eighty-two, U.S. Pat 4,328,373 have reported α-Al
2O
3Load Y
2O
3, ZrO
2, CeO
2Deng catalyzer be used for the synthetic corresponding aldehyde of carboxylic acid (ester) step hydrogenation.U.S. Pat 4,613,700 and Japanese Patent JP 60-152,434 have reported ZrO respectively
2Catalyst series is used for the catalysis of phenylformic acid gas phase hydrogenation and generates phenyl aldehyde, and its phenylformic acid transformation efficiency and phenyl aldehyde selectivity are all more than 90%.U.S. Pat 4,328,373, European patent EP 290,096 and Chinese patent CN 1,225,353 have reported MnO/ γ-Al respectively
2O
3Catalyzer is used for the phenylformic acid gas phase hydrogenation and generates phenyl aldehyde.Prior art Preparation of Catalyst cost height, the method complexity needs further improvement.
Summary of the invention
The purpose of this invention is to provide a kind of new phenylformic acid or the method for methyl benzoate gas phase catalysis synthesizing benzaldehyde.
Embodiment of the present invention relate to, and are containing Mn, Al, and (M=Mg, Zn, Pb, Ni, hydrotalcite Cr) they are that presoma and karat gold belong under the catalyst action of element modification to M, are generated the process of phenyl aldehyde by phenylformic acid or methyl benzoate hydrogenating reduction.Catalyzed reaction is being carried out in the gas-solid catalysis bed continuously.
The present invention is under above-mentioned catalyzer, and reaction can be carried out under 350-500 ℃; Reaction pressure is 0.1-1.0MPa; The mol ratio of hydrogen and phenylformic acid or methyl benzoate was controlled at 10: 1 to 100: 1; The gas hourly space velocity scope of hydrogen is 100-1400h
-1The phenylformic acid transformation efficiency reaches 98% among the present invention, and the transformation efficiency of methyl benzoate reaches 93%, and the selectivity of phenyl aldehyde reaches 95%.
The present invention for benzene feedstock formic acid preferably reaction conditions be: temperature of reaction 410-450 ℃; Reaction pressure 0.5-1Mpa; Hydrogen and benzoic mol ratio are 50: 1 to 80: 1; The gas hourly space velocity of hydrogen is 700-900h
-1
The present invention for the benzene feedstock methyl-formiate preferably reaction conditions be: temperature of reaction 370-410 ℃; Reaction pressure 0.5-1Mpa; The mol ratio of hydrogen and methyl benzoate is 20: 1 to 50: 1; The gas hourly space velocity of hydrogen is 500-700h
-1
The used catalyzer of the present invention is containing Mn, Al, M (M=Mg, Zn, Pb, Ni, Cr) and karat gold to belong to the compound of element synthetic, the Preparation of catalysts method adopts the coprecipitation method preparation, preparation is undertaken by following step:
(1) will contain Mn, the metal-nitrate solutions of Al mixes according to a certain percentage, adds suitable water, makes that the metal ion total concn is 1-3mol/l, is named as solution (1).Wherein the molar ratio range of element M n and Al is 2-4.
(2) will contain Mn, Al, M (M=Mg, Zn, Pb, Ni, metal-nitrate solutions Cr) mixes according to a certain percentage, adds suitable water, makes that the metal ion total concn is 1-3mol/l, is named as solution (2).Wherein the molar ratio range of element M n+M and Al is 2-4, and the molar ratio range of metallic element M and Mn is 0-3.
(3) under nitrogen protection, in 100ml water, add the basic solution of solution (1) or (2) and 1-3mol/l simultaneously, i.e. carry out in the alkaline system of co-precipitation, as OH
-, or OH
-/ CO
3 2-Compound alkaline solution.PH=7～10 that keep solution, after continuing to stir 2-4h, the suspension liquid of gained is in 50-80 ℃ of ageing 12-48h.
(4) throw out after filtration and repetitive scrubbing, until the pH=7 of filtrate.The filter cake of gained in 60-100 ℃ of dry 20-40h, obtains having the catalyst precursor of hydrotalcite structure under air atmosphere, be designated as M
xMn
yAl
z-HT ((x+y)/z=2-4, x/y=03).
(5) with hydrotalcite M
xMn
yAl
z-HT is a presoma, adopts equi-volume impregnating, with the KNO of 1-5mol/l
3Aqueous solution dipping 2-40h, the dipping system is drying and grinding under infrared lamp, and the gained powder obtains the hydrotalcite precursor modified through K in 60 ℃ of dry 24h under air atmosphere, be designated as K/M
xMn
yAl
z-HT (K%=0-10%).
(6) sample that obtains through (4), (5) respectively in air or nitrogen atmosphere roasting 3h finish 5 ℃/min of temperature rise rate, 500 ℃ of maturing temperatures.Sample is designated as M respectively after the roasting
xMn
yAl
z-a (roasting in the air), M
xMn
yAl
z-n (roasting in the nitrogen) and K/M
xMn
yAl
z-n (roasting in the nitrogen).
(7) through (6) resulting catalyzer before reaction through the pure hydrogen temperature programmed reduction(TPR), respectively 260 ℃ of reduction 150 minutes, 360 ℃ of reductase 12s 00 minute, 420 ℃ of reduction 150 minutes.Temperature rise rate is 5 ℃/min.
The present invention is containing Mn, Al, M (M=Mg, Zn, Pb, Ni Cr) belongs under the catalyzer existence of element with karat gold, and phenylformic acid or methyl benzoate gas-phase catalytic hydrogenation generate phenyl aldehyde.This one step of synthetic method finishes, and typical example proof is 370 ℃ in temperature of reaction, the mol ratio of hydrogen and methyl benzoate 20: 1 o'clock, and the transformation efficiency of methyl benzoate and phenyl aldehyde select performance to reach more than 90%; In temperature of reaction is 420 ℃, hydrogen and benzoic mol ratio 60: 1 o'clock, and benzoic transformation efficiency and phenyl aldehyde select performance to reach more than 90%;
Embodiment
Embodiment:
1. with 1.5ml Mn
3The Al-a catalyzer diameter of packing into is in the stainless steel reactor of 5mm, catalyzer reduces through pure hydrogen before reaction, reduction temperature is by room temperature temperature programming to 260 ℃, temperature rise rate is 5 ℃/minute, and kept 150 minutes, temperature programming to 360 ℃ again kept 200 minutes, final program is warming up to 420 ℃, keeps 150 minutes.Methyl benzoate solution is gone in the vaporizer with the metering infusion, raw material is heated to more than the boiling point is gasified totally, mixes forming unstripped gas and enter catalytic bed and react then with hydrogen after the heating.The condensation after the water cooler cooling of the product of reaction receives.Be reflected under 430 ℃ and carry out, pressure 1Mpa, the mol ratio of hydrogen and methyl benzoate was controlled at 20: 1, and the gas hourly space velocity of hydrogen in reaction is 700h
-1The methyl benzoate transformation efficiency is 94.5%, and the phenyl aldehyde selectivity is 70.2%
2. adopt catalyzer Mn
2Al-a, adopting example 1 identical method of reducing, temperature of reaction is 500 ℃, and the mol ratio of hydrogen and methyl benzoate was controlled at 10: 1, and the hydrogen gas hourly space velocity is 100h
-1, other reaction conditions is consistent with embodiment 1.The methyl benzoate transformation efficiency is 92.9%, and the phenyl aldehyde selectivity is 70.6%.
3. adopt catalyzer Mn
1Al
4-a, adopting example 1 identical method of reducing, temperature of reaction is 410 ℃, other reaction conditions is consistent with embodiment 1.The methyl benzoate transformation efficiency is 94.8%, and the phenyl aldehyde selectivity is 70.6%.
4. adopt catalyzer Mg
0.2Mn
1.8Al-a adopts the identical reductive condition of example 1,390 ℃ of temperature of reaction, and other reaction conditions is consistent with embodiment 1.The methyl benzoate transformation efficiency is 96.4%, and the phenyl aldehyde selectivity is 78.3%.
5. adopt catalyzer Mg
0.2Mn
2.8Al-a adopts the identical reductive condition of example 1,350 ℃ of temperature of reaction, and other reaction conditions is consistent with embodiment 1.The methyl benzoate transformation efficiency is 70.4%, and the phenyl aldehyde selectivity is 92.3%.
6. adopt catalyzer Mn
3Al-n adopts example 4 identical reduction and reaction conditions.The methyl benzoate transformation efficiency is 80.2%, and the phenyl aldehyde selectivity is 85.5%.
7. adopt catalyzer Mn
2Al-n adopts example 4 identical reduction and reaction conditions.The methyl benzoate transformation efficiency is 93.6%, and the phenyl aldehyde selectivity is 78.2%.
8. adopt catalyzer Mg
0.2Mn
1.8Al-n adopts example 4 identical reduction and reaction conditions.The methyl benzoate transformation efficiency is 95.2%, and the phenyl aldehyde selectivity is 75.2%.
9-12. adopt catalyzer K/Mg
0.2Mn
1.8Al-n adopts example 4 identical reduction and reaction conditions.The gained experimental result is listed in the table below.
| Sample | K％ | Transformation efficiency (%) | Phenyl aldehyde selectivity (%) |
| Example 9 examples 10 examples 11 examples 12 | 1 3 5 7 | 94.6 89.0 84.0 67.8 | 83.6 88.0 90.0 92.9 |
13-17. adopt catalyzer M
0.2Mn
1.8Al-n (M=Mg, Zn, Pb, Ni Cr), adopts the identical reductive condition of example 1,370 ℃ of temperature of reaction, other reaction conditions is consistent with embodiment 1.Experimental result is listed in the table below.
| Sample | Doping element | Transformation efficiency (%) | Phenyl aldehyde selectivity (%) |
| Example 13 examples 14 examples 15 examples 16 examples 17 | Mg Zn Ni Pb Cr | 69.4 90.7 54.3 94.4 93.3 | 91.4 73.8 42.3 84.9 80.0 |
18. adopt catalyzer 3%K/Pb
0.2Mn
1.8Al-n adopts example 13 identical reduction and reaction conditions.The methyl benzoate transformation efficiency is reached for 93.2%, and the phenyl aldehyde selectivity is 92.1%.
19. adopt catalyzer 7%K/Pb
0.2Mn
1.8Al-n adopts the identical reductive condition of example 13, and pressure is 0.1Mpa, and temperature of reaction is 500 ℃, and other reaction conditionss are constant.The methyl benzoate transformation efficiency is reached for 95.6%, and the phenyl aldehyde selectivity is 78.6%.
20. adopt catalyzer 3%K/Mn
2Al-n adopts the identical reductive condition of example 13, and raw material is used phenylformic acid instead, phenylformic acid adopts the saturated steam process vaporization before charging, be reflected under 410 ℃ and carry out, and pressure is 1.0Mpa, hydrogen and benzoic mol ratio were controlled at 100: 1, and the gas hourly space velocity of hydrogen in reaction is 500h
-1The phenylformic acid transformation efficiency is reached for 96.4%, and the selectivity of phenyl aldehyde reaches 88.4.
21. adopt catalyzer 10%K/Mg
0.2Mn
1.8Al-n adopts example 20 identical reductive condition and feeding manner, is reflected under 500 ℃ and carries out, and pressure is 0.5Mpa, and hydrogen and benzoic mol ratio were controlled at 50: 1, and the gas hourly space velocity of hydrogen in reaction is 1400h
-1The phenylformic acid transformation efficiency is reached for 98%, and the selectivity of phenyl aldehyde reaches 70%.
22. adopt catalyzer 5%K/Pb
0.2Mn
1.8Al-n adopts example 20 identical reductive condition and feeding manner, is reflected under 420 ℃ and carries out, and pressure is that 1.0Mpa hydrogen and benzoic mol ratio were controlled at 60: 1, and the gas hourly space velocity of hydrogen in reaction is 900h
-1The phenylformic acid transformation efficiency is reached for 94.6%, and the selectivity of phenyl aldehyde reaches 95.2%.
Claims (3)
1. one kind is that the catalyzer that presoma prepares is used for phenylformic acid or methyl benzoate gas phase hydrogenation generation method of benzaldehyde with the M/Mn/Al hydrotalcite, it is characterized in that being labeled as K/M
xMn
yAl
z-HT, hydrotalcite are that the catalyzer of presoma preparation exists down, and phenylformic acid or one step of methyl benzoate gas phase hydrogenation generate phenyl aldehyde, wherein K%=0-10%; M=Mg, Zn, Pb, Ni, Cr; (x+y)/z=2-4, x/y=0-3, methyl benzoate or phenylformic acid be at first through being heated to the vaporization of boiling point or vapo(u)rous method, and with enter catalytic bed after pure hydrogen mixes and react, its reaction conditions is as follows:
(1) temperature of catalyzed reaction is 350-500 ℃;
(2) pressure of catalyzed reaction is 0.1-1.0MPa;
(3) mol ratio of hydrogen and phenylformic acid or methyl benzoate was at 10: 1 to 100: 1;
(4) the gas hourly space velocity scope of oxygen is 100-1400h
-1
2. method according to claim 1, it is characterized in that being used for phenylformic acid gas phase oxygenation and generate phenyl aldehyde, and reaction conditions is as follows:
(1) temperature of catalyzed reaction is 410-450 ℃;
(2) pressure of catalyzed reaction is 0.5-1MPa;
(3) hydrogen and benzoic mol ratio were at 50: 1 to 80: 1;
(4) the gas hourly space velocity scope of hydrogen is 700-900h
-1
3. method according to claim 1, it is characterized in that being used for the methyl benzoate gas phase hydrogenation and generate phenyl aldehyde, and reaction conditions is as follows:
(1) temperature of change reaction is 370-410 ℃;
(2) pressure of catalyzed reaction is 0.5-1MPa;
(3) mol ratio of hydrogen and methyl benzoate was at 20: 1 to 50: 1;
(4) the gas hourly space velocity scope of hydrogen is 500-700h
-1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03142119 CN1242972C (en) | 2003-08-07 | 2003-08-07 | Catalyst prepared by using M/Mn/Al hydrotalcite as precursor for producing benzyl formaldehyde by gaseous phase hydrogenation of benzoic acid or methoylbenzoatc |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03142119 CN1242972C (en) | 2003-08-07 | 2003-08-07 | Catalyst prepared by using M/Mn/Al hydrotalcite as precursor for producing benzyl formaldehyde by gaseous phase hydrogenation of benzoic acid or methoylbenzoatc |
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|---|---|
| CN1473810A CN1473810A (en) | 2004-02-11 |
| CN1242972C true CN1242972C (en) | 2006-02-22 |
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| CN 03142119 Expired - Fee Related CN1242972C (en) | 2003-08-07 | 2003-08-07 | Catalyst prepared by using M/Mn/Al hydrotalcite as precursor for producing benzyl formaldehyde by gaseous phase hydrogenation of benzoic acid or methoylbenzoatc |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1300075C (en) * | 2005-03-24 | 2007-02-14 | 复旦大学 | Method for synthesizing benzoic alcohol by using temperature gradient |
| CN101785996A (en) * | 2010-03-10 | 2010-07-28 | 天津大学 | Catalyst for eliminating carbon soot particles and nitrogen oxides simultaneously, preparation and application thereof |
| CN103204767B (en) * | 2013-04-25 | 2015-12-09 | 江苏理工学院 | Phenylformic acid gas-phase catalytic hydrogenation prepares the method without chlorobenzaldehyde |
| CN106964343B (en) * | 2017-04-11 | 2020-06-02 | 北京恩泽福莱科技有限公司 | Catalyst for preparing benzaldehyde by methyl benzoate hydrogenation and preparation method thereof |
| CN109225249B (en) * | 2018-09-14 | 2019-05-24 | 成都理工大学 | A kind of nickel manganese aluminium composite oxide catalyst for acetic acid self-heating reforming hydrogen manufacturing |
| CN109939692A (en) * | 2019-02-14 | 2019-06-28 | 北京氦舶科技有限责任公司 | A kind of manganese oxide catalyst and its preparation method and application |
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