CN101108367A - Method for manufacturing catalyst used for synthesizing benzaldehyde - Google Patents
Method for manufacturing catalyst used for synthesizing benzaldehyde Download PDFInfo
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- CN101108367A CN101108367A CNA2007100623318A CN200710062331A CN101108367A CN 101108367 A CN101108367 A CN 101108367A CN A2007100623318 A CNA2007100623318 A CN A2007100623318A CN 200710062331 A CN200710062331 A CN 200710062331A CN 101108367 A CN101108367 A CN 101108367A
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Abstract
The invention discloses a catalyst for synthesizing benzaldehyde, which is characterized in that chrome Schiff base complex is taken as an active component, silica gel is taken as a carrier, and the ratio of silica gel to the chrome Schiff base complex is 1 g: 0.04-0.4 mmol. The invention has a simple preparation method and easy operation. In the synthesizing reaction of benzaldehyde, the invention has the high transformation rate of the benzaldehyde, the good selectivity of the produced benzaldehyde and the good repeated use performance for the catalyst.
Description
Technical field:
The invention belongs to solid catalyst and preparation method and application that a kind of Oxybenzene methyl alcohol prepares benzaldehyde.
Background technology
Benzaldehyde claims almond oil again, be the simplest, also be industrial most important aromatic aldehyde.It is an intermediate of making dyestuff, also is the important source material of making fine chemicals such as medicine, spices, flavouring, coating.The conventional production methods of benzaldehyde is to be raw material with toluene, by Benzyl Side-Chain Chloride then hydrolysis make or prepare benzoic accessory substance as toluene oxidation.In last process, the benzaldehyde of being produced often comprises the halogen ion of trace; In one process of back, its selectivity is lower again.In order to produce the benzaldehyde of needed Halogen on spices and the pharmaceutical industries, the selective catalytic oxidation phenmethylol is present topmost synthesizing mean.Wherein, be oxidant with the hydrogen peroxide, because accessory substance has only water, be a low pollution, eco-friendly route.
The method of catalytic oxidation phenmethylol can be divided into: homogeneous phase method and heterogeneous method.Homogeneous catalyst mainly comprises: heteropoly acid, sodium tungstate and various quaternary amine.The homogeneous catalyst activity is higher, but unavoidably has problems such as product separation and catalyst repeated use, so heterogeneous catalysis has been subjected to attention gradually.Yet heterogeneous catalysis such as HTS commonly used at present, alum si molecular sieves all exist phenmethylol conversion ratio and lower drawback (conversion ratio＜20% of benzaldehyde selectivity; Selectivity＜60%).Thereby need purify to product, and with reactant repeatedly cyclic oxidation just can reach industrial requirement, energy consumption, material consumption are comparatively serious.
Summary of the invention:
The purpose of this invention is to provide a kind of selectivity that can improve benzaldehyde, possess the good catalyst of high catalytic activity and repeat performance and preparation method and application simultaneously.
Catalyst of the present invention is characterized in that with the chromium schiff bases complex be active constituent, and silica gel is carrier, silica gel: chromium schiff bases complex=1g: 0.04-0.4mmol.
Preparation of catalysts method of the present invention comprises the steps:
(1) aminopropyl trimethoxysilane is configured to cyclohexane solution, after stirring silica gel is immersed wherein, add hot reflux 8-12h, cooling, suction filtration, solid sample is with toluene extracting 8-12h, and 80-100 ℃ of following vacuum drying 8-12h promptly gets the silica gel (NH of aminopropyl functionalization
2/ SiO
2), wherein the mass ratio of aminopropyl trimethoxysilane, cyclohexane and silica gel is 5: 50-100: 3-4;
(2) with ethanol total amount 50% salicylic aldehyde is configured to the salicylic aldehyde ethanolic solution, with 50% of ethanol total amount o-phenylenediamine is configured to the o-phenylenediamine ethanolic solution, the o-phenylenediamine ethanolic solution is added dropwise in the salicylic aldehyde ethanolic solution, 80 ℃ of following backflow 1-3h, add chromium chloride again, continue stirring and refluxing 3-6h, cooling, suction filtration, both got chromium schiff bases complex (Cr (salphen)), wherein the mass ratio of salicylic aldehyde, o-phenylenediamine, ethanol and chromium chloride is 1.2: 0.55: 50-120: 1.5-2;
(3) silica gel and the chromium schiff bases complex with the aminopropyl functionalization joins in the cyclohexane, behind the stirring and refluxing 8-12h, cooling, suction filtration, solid sample toluene extracting 8-12h, 80-100 ℃ of following vacuum drying 8-12h, promptly get the chromium schiff bases complex catalyst of silica gel grafting, wherein silica gel (the NH of aminopropyl functionalization
2/ SiO
2), the mass ratio of chromium schiff bases complex Cr (salphen) and cyclohexane is 1: 0.5-2: 50-100.
Catalyst of the present invention is used for synthesizing benzaldehyde, method is that the hydrogen peroxide with phenmethylol and 30-90% is 1 with mol ratio: the ratio of 2-5, and consumption is that the catalyst of reactant gross weight 0.5-2% adds in the reactor together, under stirring condition, be warming up to 30-80 ℃, reaction 4-10h obtains product through centrifugal sedimentation.
Product analysis: product is analyzed with the GC-920 that sea, Shanghai glad chromatogram Co., Ltd produces.Chromatographic condition is as follows: chromatographic column: external diameter 3mm, the stainless steel column of long 2m; Carrier: GDX-203 (60-80 order); Detector: hydrogen flame; Injector temperature: 250 ℃; The column temperature temperature programming: 40 ℃ of initial temperature, 10 ℃/min of heating rate, temperature is 220 ℃ eventually, time 15min; Sample size: 0.1ul.
The present invention compared with prior art has following advantage:
(1) method for preparing catalyst is simple, and is easy to operate.
(2) in the benzaldehyde synthetic reaction, phenmethylol conversion ratio height, product benzaldehyde selectivity is good.
(3) the catalyst repeat performance is good.
(4) cost is low, reaction condition gentleness, green.
The specific embodiment:
Embodiment 1:
The 5.0g aminopropyl trimethoxysilane joined in the 50g cyclohexane be configured to solution, the back that stirs adds hot reflux 8h to wherein adding 3.0g silica gel, and cooling, suction filtration, solid sample are with toluene extracting 8h, and 80 ℃ of following vacuum drying 8h promptly get NH
2/ SiO
2The 25g ethanol solution that will be dissolved with the 0.55g o-phenylenediamine then is added drop-wise in the 25g anhydrous alcohol solution that is dissolved with the 1.2g salicylic aldehyde, and 80 ℃ of following backflow 1h add the chromium chloride of 1.5g again, continue stirring and refluxing 3h, cooling, suction filtration, both Cr (salphen).With 1gNH
2/ SiO
2Join in the 50g cyclohexane with 0.5g Cr (salphen), behind the stirring and refluxing 8h, cooling, suction filtration, solid sample toluene extracting 8h, 80 ℃ of following vacuum drying 8h promptly get this catalyst for reaction.Phenmethylol, hydrogen peroxide and catalyst are added in the 75mL autoclave, and phenmethylol and hydrogen peroxide mol ratio are 1: 2, and catalyst amount is the 0.5%wt of reactant gross weight, under the stirring condition, be warming up to 30 ℃, reaction 4h, product is got the supernatant liquor gas chromatographic analysis through centrifugal sedimentation.The results are shown in Table 1.
Embodiment 2:
The 5.0g aminopropyl trimethoxysilane joined in the 80g cyclohexane be configured to solution, the back that stirs adds hot reflux 9h to wherein adding 3.3g silica gel, and cooling, suction filtration, solid sample are with toluene extracting 9h, and 80 ℃ of following vacuum drying 9h promptly get NH
2/ SiO
2The 30g ethanol solution that will be dissolved with the 0.55g o-phenylenediamine then is added drop-wise in the 30g anhydrous alcohol solution that is dissolved with the 1.2g salicylic aldehyde, and 80 ℃ of following backflow 2h add the chromium chloride of 1.5g again, continue stirring and refluxing 3h, cooling, suction filtration, both Cr (salphen).With 1g NH
2/ SiO
2Join in the 60g cyclohexane with 0.5g Cr (salphen), behind the stirring and refluxing 9h, cooling, suction filtration, solid sample toluene extracting 10h, 80 ℃ of following vacuum drying 10h promptly get this catalyst for reaction.Phenmethylol, hydrogen peroxide and catalyst are added in the 75mL autoclave, and phenmethylol and hydrogen peroxide mol ratio are 1: 2.5, and catalyst amount is the 0.5%wt of reactant gross weight, under the stirring condition, be warming up to 40 ℃, reaction 4h, product is got the supernatant liquor gas chromatographic analysis through centrifugal sedimentation.Knot
Fruit sees Table 1.
Embodiment 3:
The 5.0g aminopropyl trimethoxysilane joined in the 100g cyclohexane be configured to solution, the back that stirs adds hot reflux 10h to wherein adding 3.7g silica gel, and cooling, suction filtration, solid sample are with toluene extracting 10h, and 100 ℃ of following vacuum drying 10h promptly get NH
2/ SiO
2The 40g ethanol solution that will be dissolved with the 0.55g o-phenylenediamine then is added drop-wise in the 40g anhydrous alcohol solution that is dissolved with the 1.2g salicylic aldehyde, and 80 ℃ of following backflow 3h add the chromium chloride of 1.7g again, continue stirring and refluxing 6h, cooling, suction filtration, both Cr (salphen).With 1g NH
2/ SiO
2And 0.8gCr (salphen) joins in the 100g cyclohexane, and behind the stirring and refluxing 10h, cooling, suction filtration, solid sample are with toluene extracting 10h, and 90 ℃ of following vacuum drying 10h promptly get this catalyst for reaction.Phenmethylol, hydrogen peroxide and catalyst are added in the 75mL autoclave, and phenmethylol and hydrogen peroxide mol ratio are 1: 2.5, and catalyst amount is the 1%wt of reactant gross weight, under the stirring condition, be warming up to 50 ℃, reaction 4h, product is got the supernatant liquor gas chromatographic analysis through centrifugal sedimentation.The results are shown in Table 1.
Embodiment 4:
The 5.0g aminopropyl trimethoxysilane joined in the 1 00g cyclohexane be configured to solution, the back that stirs adds hot reflux 11h to wherein adding 3.8g silica gel, and cooling, suction filtration, solid sample are with toluene extracting 12h, and 80 ℃ of following vacuum drying 12h promptly get NH
2/ SiO
2The 50g ethanol solution that will be dissolved with the 0.55g o-phenylenediamine then is added drop-wise in the 50g anhydrous alcohol solution that is dissolved with the 1.2g salicylic aldehyde, and 80 ℃ of following backflow 1h add the chromium chloride of 2 g again, continue stirring and refluxing 3h, cooling, suction filtration, both Cr (salphen).With 1g NH
2/ SiO
2Join in the 100g cyclohexane with 1g Cr (salphen), behind the stirring and refluxing 10h, cooling, suction filtration, solid sample toluene extracting 10h, 80 ℃ of following vacuum drying 12h promptly get this catalyst for reaction.Phenmethylol, hydrogen peroxide and catalyst are added in the 75mL autoclave, and phenmethylol and hydrogen peroxide mol ratio are 1: 3, and catalyst amount is the 1.5%wt of reactant gross weight, under the stirring condition, be warming up to 80 ℃, reaction 4h, product is got the supernatant liquor gas chromatographic analysis through centrifugal sedimentation.The results are shown in Table 1.
Embodiment 5:
The 5.0g aminopropyl trimethoxysilane joined in the 100g cyclohexane dispose solution, the back that stirs adds hot reflux 12h to wherein adding 4.0g silica gel, cooling, suction filtration, and solid sample is with toluene extracting 12h, 100 ℃ of following vacuum drying 10h.Promptly get NH
2/ SiO
2The 50g ethanol solution that will be dissolved with the 0.55g o-phenylenediamine then is added drop-wise in the 50g anhydrous alcohol solution that is dissolved with the 1.2g salicylic aldehyde, and 80 ℃ of following backflow 1h add the chromium chloride of 2g again, continue stirring and refluxing 3h, cooling, suction filtration, both Cr (salphen).With 1g NH
2/ SiO
2And in the 100g cyclohexane that joins of 1.5gCr (salphen), behind the stirring and refluxing 12h, cooling, suction filtration, solid sample are with toluene extracting 12h, and 100 ℃ of following vacuum drying 10h promptly get this catalyst for reaction.Phenmethylol, hydrogen peroxide and catalyst are added in the 75mL autoclave, and phenmethylol and hydrogen peroxide mol ratio are 1: 3, and catalyst amount is the 1.5%wt of reactant, under the stirring condition, be warming up to 50 ℃, reaction 8h, product is got the supernatant liquor gas chromatographic analysis through centrifugal sedimentation.
The results are shown in Table 1.
Embodiment 6:
The 5.0g aminopropyl trimethoxysilane joined in the 100g cyclohexane be configured to solution, the back that stirs adds hot reflux 12h to wherein adding 4.0g silica gel, cooling, suction filtration, and solid sample is with toluene extracting 12h, 100 ℃ of following vacuum drying 12h.Promptly get NH
2/ SiO
2The 60g ethanol solution that will be dissolved with the 0.55g o-phenylenediamine then is added drop-wise in the 60g anhydrous alcohol solution that is dissolved with the 1.2g salicylic aldehyde, and 80 ℃ of following backflow 3h add the chromium chloride of 1.5g again, continue stirring and refluxing 6h, cooling, suction filtration, both Cr (salphen).With 1g NH
2/ SiO
2And 2gCr (salphen) joins in the 100g cyclohexane, and behind the stirring and refluxing 12h, cooling, suction filtration, solid sample are with toluene extracting 12h, and 100 ℃ of following vacuum drying 12h promptly get this catalyst for reaction.With phenmethylol, hydrogen peroxide and catalyst add in the 75mL autoclave, phenmethylol and hydrogen peroxide mol ratio 1: 5, catalyst amount is the 2%wt of reactant gross weight, under the stirring condition, is warming up to 50 ℃, reaction 10h, product is got the supernatant liquor gas chromatographic analysis through centrifugal sedimentation.With isolated catalyst detergent drying, standby.The results are shown in Table 1.
Embodiment 7:
The isolated catalyst in embodiment 3 reaction backs is reused as this catalysts.Phenmethylol, hydrogen peroxide and catalyst are added in the 75mL autoclave, and phenmethylol and hydrogen peroxide mol ratio are 1: 2.5, and catalyst amount is the 1%wt of reactant gross weight, under the stirring condition, be warming up to 50 ℃, reaction 4h, product is got the supernatant liquor gas chromatographic analysis through centrifugal sedimentation.With isolated catalyst detergent drying, standby.The results are shown in Table 1.
Embodiment 8:
The isolated catalyst in embodiment 7 reaction backs is reused as this catalysts.Phenmethylol, hydrogen peroxide and catalyst are added in the 75mL autoclave, and phenmethylol and hydrogen peroxide mol ratio are 1: 2.5, and catalyst amount is the 1%wt of reactant gross weight, under the stirring condition, be warming up to 50 ℃, reaction 4h, product is got the supernatant liquor gas chromatographic analysis through centrifugal sedimentation.With isolated catalyst detergent drying, standby.The results are shown in Table 1.
Embodiment 9:
The isolated catalyst in embodiment 8 reaction backs is reused as this catalysts.Phenmethylol, hydrogen peroxide and catalyst are added in the 75mL autoclave, and phenmethylol and hydrogen peroxide mol ratio are 1: 2.5, and catalyst amount is the 1%wt of reactant gross weight, under the stirring condition, be warming up to 50 ℃, reaction 4h, product is got the supernatant liquor gas chromatographic analysis through centrifugal sedimentation.With isolated catalyst detergent drying, standby.The results are shown in Table 1.
Embodiment 10:
The isolated catalyst in embodiment 9 reaction backs is reused as this catalysts.Phenmethylol, hydrogen peroxide and catalyst are added in the 75mL autoclave, and phenmethylol and hydrogen peroxide mol ratio are 1: 2.5, and catalyst amount is the 1%wt of reactant gross weight, under the stirring condition, be warming up to 50 ℃, reaction 4h, product is got the supernatant liquor gas chromatographic analysis through centrifugal sedimentation.
The results are shown in Table 1.
Table 1
| Embodiment | Phenmethylol conversion ratio (%) | Benzaldehyde selectivity (%) |
| Embodiment 1 | 20.1 | 80.4 |
| Embodiment 2 | 29.3 | 85.2 |
| Embodiment 3 | 55.0 | 100 |
| Embodiment 4 | 59.6 | 88.1 |
| Embodiment 5 | 57.5 | 90.6 |
| Embodiment 6 | 60.7 | 83.0 |
| Embodiment 7 | 52.3 | 95.4 |
| Embodiment 8 | 48.9 | 91.7 |
| Embodiment 9 | 45.5 | 90.5 |
| Embodiment 10 | 40.0 | 88.6 |
Claims (3)
1. a catalyst that is used for synthesizing benzaldehyde is characterized in that with the chromium schiff bases complex be active constituent, and silica gel is carrier, silica gel: chromium schiff bases complex=1g: 0.04-0.4mmol.
2. a kind of Preparation of catalysts method that is used for synthesizing benzaldehyde as claimed in claim 1 is characterized in that comprising the steps:
(1) aminopropyl trimethoxysilane is configured to cyclohexane solution, after stirring silica gel is immersed wherein, add hot reflux 8-12h, cooling, suction filtration, solid sample toluene extracting 8-12h, 80-100 ℃ of following vacuum drying 8-12h promptly gets the silica gel of aminopropyl functionalization, and wherein the mass ratio of aminopropyl trimethoxysilane, cyclohexane and silica gel is 5: 50-100: 3-4;
(2) with ethanol total amount 50% salicylic aldehyde is configured to the salicylic aldehyde ethanolic solution, with 50% of ethanol total amount o-phenylenediamine is configured to the o-phenylenediamine ethanolic solution, the o-phenylenediamine ethanolic solution is added dropwise in the salicylic aldehyde ethanolic solution, 80 ℃ of following backflow 1-3h, add chromium chloride again, continue stirring and refluxing 3-6h, cooling, suction filtration, both got the chromium schiff bases complex, wherein the mass ratio of salicylic aldehyde, o-phenylenediamine, ethanol and chromium chloride is 1.2: 0.55: 50-120: 1.5-2;
(3) silica gel and the chromium schiff bases complex with the aminopropyl functionalization joins in the cyclohexane, behind the stirring and refluxing 8-12h, cooling, suction filtration, solid sample toluene extracting 8-12h, 80-100 ℃ of following vacuum drying 8-12h, promptly get the chromium schiff bases complex catalyst of silica gel grafting, wherein the mass ratio of the silica gel of aminopropyl functionalization, chromium schiff bases complex and cyclohexane is 1: 0.5-2: 50-100.
3. a kind of Application of Catalyst that is used for synthesizing benzaldehyde as claimed in claim 1, it is characterized in that the hydrogen peroxide with phenmethylol and 30-90% is 1 with mol ratio: the ratio of 2-5, and consumption is that the catalyst of reactant gross weight 0.5-2% adds in the reactor together, under stirring condition, be warming up to 30-80 ℃, reaction 4-10h obtains product through centrifugal sedimentation.
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Cited By (5)
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| CN101550074B (en) * | 2009-05-25 | 2011-12-07 | 哈尔滨师范大学 | Catalytic synthesizing method of benzaldehyde |
| CN102773078A (en) * | 2012-07-16 | 2012-11-14 | 武汉纺织大学 | Solid complexation extractant capable of simultaneously adsorbing cation and anion, and preparation and application thereof |
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| CN1170834C (en) * | 2000-08-30 | 2004-10-13 | 中国科学院大连化学物理研究所 | Epoxidizing catalyst for polymerizing chiral Xifu alkali-metal |
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| CN101550074B (en) * | 2009-05-25 | 2011-12-07 | 哈尔滨师范大学 | Catalytic synthesizing method of benzaldehyde |
| CN102773078A (en) * | 2012-07-16 | 2012-11-14 | 武汉纺织大学 | Solid complexation extractant capable of simultaneously adsorbing cation and anion, and preparation and application thereof |
| CN103962182A (en) * | 2014-05-20 | 2014-08-06 | 武汉工程大学 | Heteropoly acid doped Schiff base mononuclear manganese complex catalyst as well as synthesis method and application thereof |
| CN107899572A (en) * | 2017-10-24 | 2018-04-13 | 安徽省福泰精细化工有限责任公司 | A kind of preparation method for the catalyst for electrolytic silver for being used to produce formaldehyde |
| CN107899572B (en) * | 2017-10-24 | 2020-10-16 | 安徽省福泰精细化工有限责任公司 | Preparation method of electrolytic silver catalyst for producing formaldehyde |
| CN115819201A (en) * | 2022-11-22 | 2023-03-21 | 江苏万隆化学有限公司 | Green synthesis process of o-chlorobenzaldehyde catalyzed by titanium silicalite molecular sieve |
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