CN100509741C - Method for synthesizing crotonic acid by using byproduct of croton aldehyde - Google Patents
Method for synthesizing crotonic acid by using byproduct of croton aldehyde Download PDFInfo
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- CN100509741C CN100509741C CNB2007100192942A CN200710019294A CN100509741C CN 100509741 C CN100509741 C CN 100509741C CN B2007100192942 A CNB2007100192942 A CN B2007100192942A CN 200710019294 A CN200710019294 A CN 200710019294A CN 100509741 C CN100509741 C CN 100509741C
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Abstract
This invention relates to a method for synthesizing crotonic acid from crotonaldehyde byproduct. The method comprises: distilling 20-40% crotonaldehyde byproduct by controlling the boiling point of the distillate on the top of the column at 25-65 deg.C to remove light components and obtain 45-60% crotonaldehyde in the solution in distillation kettle, adopting the solution in distillation kettle as the raw material, acetone, acetic acid, benzene or toluene as the solvent, phosphomolybdic acid as the main catalyst, and V2O5 as the cocatalyst, and reacting at 30-100 deg.C and 0.3-0.9 MPa in the presence of O2, separating the catalyst, distilling to remove the solvent, and recrystallizing with deionized water for twice to obtain crotonic acid with a purity higher than 99%. Phosphomolybdic acid can be supported by such carriers as active carbon, SiO2, gamma-Al2O3 or molecular sieve. Therefore, the catalyst can be separated from the reaction solution by filtration, and dried in air at 120 deg.C for recycling. The method has such advantages as simple process and high crotonic acid yield.
Description
Technical field
The present invention relates to a kind of method of comprehensive utilization of chemical industry by product, specifically a kind of method of utilizing by-product crotonic aldehyde synthesizing crotonic acid.
Background technology
Acetaldehyde is the important source material of synthesis of acetic acid, pyridine, tetramethylolmethane and Sorbic Acid etc., and its major industry production method has oxidation of ethanol method and direct oxidation of ethylene to method.Because acetaldehyde character is active, in the acetaldehyde production process, two molecules of acetaldehyde generation condensation dehydration reactions generate crotonic aldehyde, the by-product crotonic aldehyde is the 8th column plate side line extraction from acetaldehyde treating tower top, the main chemical composition of extraction liquid comprises crotonic aldehyde, acetaldehyde, water and paraldehyde etc., crotonic aldehyde and water have also formed binary azeotropic, and the crotonic aldehyde chemical property is active, polymerization easily, therefore adopt conventional distillation to be difficult to separate, even employing azeotropic distillation, special separation means such as extractive distillation with salt, the purity of gained crotonic aldehyde product does not still reach the requirement of industrial goods crotonic aldehyde purity (〉=99%).And these special separation methods have special requirement, separating energy consumption height to equipment anticorrosion etc.
The by-product crotonic aldehyde is carried out pre-treatment can improve crotons aldehyde concentration in the by product, can be used for important organic chemical industry's intermediates such as synthesizing crotonic acid, utilize Ba Dousuan at normal temperatures for the crystalline characteristics, can separate easily by crystallization and recrystallization separation method, obtain qualified derived product.This method has been avoided the refining separating step of by-product crotonic aldehyde, has not only realized the comprehensive utilization of by product resource, reaches the cleaner production purpose, has also improved the value of by product.
(Jiangsu Petrochemical Engineering College journal such as Li Weimin, 2002,14 (4): 4～6) the by-product crotonic aldehyde is anhydrated by removing with the salt pre-treatment earlier, rectifying gets content and is about 65% crotonic aldehyde then, at benzene is catalyzed oxidation synthesizing crotonic acid under the solvent condition, and the mass yield of Ba Dousuan is 58.03% (being converted to molar yield is 47.25%).The yield of this method synthesizing crotonic acid is low, and use with salt rectifying pretreatment process complexity, equipment is had corrodibility.
Summary of the invention
For overcoming above-mentioned shortcoming, the purpose of this invention is to provide a kind of method of by-product crotonic aldehyde synthesizing crotonic acid.The by-product crotonic aldehyde is at first deviate from light constituents such as most of acetaldehyde by simple distillation, this light constituent send the acetaldehyde treating tower of acetaldehyde device to reclaim acetaldehyde, distillation kettle liquid adopts the dioxygen oxidation synthesizing crotonic acid under catalyst action, contain the Ba Dousuan reacting liquid filtering and reclaim solid catalyst, the filtrate distillation is from the recovered overhead solvent, the distillation kettle liquid heating for dissolving is in the crystallization of deionized water postcooling, obtains mass content greater than 99% Ba Dousuan product with the deionized water recrystallization then.
A kind of method of by-product crotonic aldehyde synthesizing crotonic acid comprises:
1, the by-product crotonic aldehyde is carried out air distillation, control overhead product boiling point must concentrate the distillation kettle liquid of crotonic aldehyde at 25～65 ℃.
2, the crotonic aldehyde that obtains with distillation kettle liquid be raw material in the presence of solvent, catalyzer, 30～100 ℃ of temperature of reaction, pressure 0.3～0.9MPa, logical oxygen reaction 1～8 hour, the crotonic aldehyde reaction generates Ba Dousuan.
Reaction can be recycled after 3 hours in air drying under 120 ℃ after catalyzer and the reaction product filtering separation after finishing, and catalyst activity is constant substantially.
Pass through distillating recovering solvent with the reaction product after the catalyst separating, solvent can recycle.Distillation kettle liquid cooling back water recrystallization twice, Ba Dousuan crystal can get mass content and surpass 99% Ba Dousuan product being no more than 50 ℃ of following vacuum-dryings
Solvent can be acetone, acetate, benzene, toluene, and preferred acetone, solvent load are 2～8 times of crotonic aldehyde quality (calculating according to folding hundred), preferred 4～6 times.It is Primary Catalysts that catalyzer is formed with the phospho-molybdic acid, and Vanadium Pentoxide in FLAKES is a promotor, and phospho-molybdic acid both can directly use, also it can be loaded on the support of the catalyst, be advisable with loading type phospho-molybdic acid catalyzer, the catalyzer after the load can be recycled, and activity is constant substantially; The support of the catalyst of using can be gac, SiO
2, γ-Al
2O
3, molecular sieve etc., preferred gac,
The consumption of phospho-molybdic acid is 10～50% of a load rear catalyst total mass, preferred 15～20%, the total consumption of phospho-molybdic acid and Vanadium Pentoxide in FLAKES is 1～10% of a crotonic aldehyde quality (calculating according to folding hundred), and is preferred 4～6%, the mass ratio of phospho-molybdic acid and Vanadium Pentoxide in FLAKES is 30/1～10/4, and preferred 20/1～10/1.Preferred 40～50 ℃ of temperature of reaction, the preferred 0.45～0.55MPa of reaction pressure, preferred 4～5 hours of reaction times.
Another object of the present invention provides the load method of phospho-molybdic acid catalyzer in a kind of by-product crotonic aldehyde synthesizing crotonic acid, comprises the steps:
(1) carrier is put into nitric acid or the hydrochloric acid soln of 1～6mol/L, was left standstill at least 12 hours after 1～3 hour in room temperature to 100 a ℃ following heated and stirred, again with deionized water wash to neutral, the oven dry back is standby.With SiO
2In 100～120 ℃ dry 4～5 hours down, again in retort furnace in 400～600 ℃ of calcinations 3～4 hours, the cooling back is standby.γ-Al
2O
3, the molecular sieve pre-treatment is 400～500 ℃ of following roastings 4～6 hours, removes behind the physical absorption water standby.
(2) phospho-molybdic acid is dissolved in the less easy volatile solvent of surface tension, being mixed with concentration is 0.05～0.3g/mL phosphorus molybdenum acid solution.
(3) phosphorus molybdenum acid solution for preparing is mixed with pretreated support of the catalyst, left standstill at least 12 hours after 5～10 hours 50～90 ℃ of following stirring and refluxing, boil off solvent then, oven dry is placed in the moisture eliminator standby.
Every gram gac uses 5～15mL nitric acid or hydrochloric acid soln in the described step (1), and easy volatile solvent is methyl alcohol, ethanol, acetone, ether etc. described in the step (2), preferred acetone.
The acetaldehyde device by-product crotonic aldehyde pretreatment process that the inventive method is used adopts distillation to remove after the part light constituent, distillation kettle liquid direct oxidation synthesizing crotonic acid, and the pretreatment process of by product is simple, the rate of recovery height of crotonic aldehyde.The catalyst for oxidation reaction that the inventive method is used is easy to prepare, and cost is lower, and reactive behavior height, selectivity height, good stability can be realized separating of catalyzer and reaction product by filtering, and the catalyzer repeated use that can repeatedly circulate.Because Ba Dousuan is a kind of high added value derived product of crotonic aldehyde, therefore, the inventive method has realized the value promotion of acetaldehyde device by-product crotonic aldehyde, has reduced the organic by-products discharging of acetaldehyde device, and is favourable to the cleaner production of acetaldehyde device.
Embodiment
Further describe the present invention below in conjunction with embodiment, but scope of the present invention is not limited to these embodiment.The by-product crotonic aldehyde is produced by raising sub-petrochemical industry chemical plant in following examples.
Embodiment 1:
Adding 800g crotonic aldehyde content is 23.37% acetaldehyde device by-product crotonic aldehyde in the 1000ml there-necked flask of diameter 25mm distillation tower, being distilled to tower top temperature under do not have refluxing reaches 65 ℃ and stops, the remaining still liquid 371g that weighs in the flask, still liquid adopts gas chromatographic analysis, the crotonic aldehyde mass content is 45.75%, and the rate of recovery of crotonic aldehyde is 90.79%.
Embodiment 2:
Adding 800g crotonic aldehyde content is 33.54% acetaldehyde device by-product crotonic aldehyde in the 1000ml there-necked flask of diameter 25mm distillation tower, being distilled to tower top temperature under do not have refluxing reaches 65 ℃ and stops, the remaining still liquid 443g that weighs in the flask, still liquid adopts gas chromatographic analysis, the crotonic aldehyde mass content is 55.01%, and the rate of recovery of crotonic aldehyde is 90.82%.
Embodiment 3:
Adding 800g crotonic aldehyde content is 23.37% acetaldehyde device by-product crotonic aldehyde in the 1000ml there-necked flask of diameter 25mm distillation tower, being distilled to tower top temperature under do not have refluxing reaches 25 ℃ and stops, the remaining still liquid 698g that weighs in the flask, still liquid adopts gas chromatographic analysis, the crotonic aldehyde mass content is 26.50%, and the rate of recovery of crotonic aldehyde is 98.95%.
Embodiment 4:
The 65g gac is put into the salpeter solution that 280mL concentration is 4mol/L, at 90 ℃ of following heated and stirred 1h, left standstill 12 hours, to neutral, 120 ℃ were dried by the fire 12 hours down in baking oven with deionized water wash.Compound concentration is the phospho-molybdic acid methanol solution 150mL of 0.1g/mL, add the pretreated gac of 60g again, 55 ℃ of following stirring and refluxing 6 hours, left standstill 12 hours, in water-bath, boil off unnecessary methyl alcohol, in baking oven 120 ℃ dry 24 hours down, make supported quantity and be 20% the immobilized phospho-molybdic acid catalyzer of gac, place moisture eliminator standby.
Embodiment 5:
With 20gSiO
2Drying is 5 hours under 120 ℃, and then 500 ℃ of following calcinations 4 hours, cooling places moisture eliminator standby.Compound concentration is the phosphomolybdic acid ethanol solution 50mL of 0.3g/mL, adds the pretreated SiO of 15g again
2, 55 ℃ of following stirring and refluxing 6 hours, left standstill 12 hours, in water-bath, boil off unnecessary methyl alcohol, 120 ℃ of bakings 24 hours down in baking oven again make supported quantity and are 50% SiO
2Immobilized phospho-molybdic acid catalyzer places moisture eliminator standby.
Embodiment 6:
With 50g γ-Al
2O
3500 ℃ of calcinations 5 hours, cooling placed moisture eliminator standby.Compound concentration is the phospho-molybdic acid acetone soln 100mL of 0.05g/mL, adds the pretreated γ-Al of 45g again
2O
3, 55 ℃ of following stirring and refluxing 6 hours, left standstill 12 hours, in water-bath, boil off unnecessary methyl alcohol, 120 ℃ of bakings 24 hours down in baking oven again make supported quantity and are 10% the immobilized phospho-molybdic acid catalyzer of gac, place moisture eliminator standby.
Embodiment 7:
500 ℃ of calcinations 5 hours, cooling placed moisture eliminator standby with 65g Hydrogen beta-molecular sieve.Compound concentration is the phospho-molybdic acid acetone soln 100mL of 0.15g/mL, add the pretreated Hydrogen beta-molecular sieve of 60g again, 55 ℃ of following stirring and refluxing 6 hours, left standstill 12 hours, in water-bath, boil off unnecessary acetone, 120 ℃ of down bakings 24 hours in baking oven again make supported quantity and are 20% the immobilized phospho-molybdic acid catalyzer of beta-molecular sieve, place moisture eliminator standby.
Embodiment 8:
In 1L high pressure tank reactor, add the crotonic aldehyde still liquid 150g after embodiment 1 distills, solvent acetone 412g, the 0.13g Vanadium Pentoxide in FLAKES, phospho-molybdic acid catalyzer 2.61g, 45 ℃ of control reaction temperature, reaction pressure 5atm, the aerating oxygen reaction is 8 hours continuously.The reaction product gas chromatographic analysis, the transformation efficiency that calculates crotonic aldehyde is 91.24%, and the selectivity of Ba Dousuan is 65.83%, and the molar yield of Ba Dousuan is 60.06%.
Embodiment 9:
In 1L high pressure tank reactor, add the crotonic aldehyde still liquid 150g after embodiment 1 distills, solvent acetone 345g, 0.31g Vanadium Pentoxide in FLAKES, the immobilized phospho-molybdic acid catalyzer of the gac that embodiment 4 newly makes 15.6g, 45 ℃ of control reaction temperature, reaction pressure 5atm, the aerating oxygen reaction is 4 hours continuously.The reaction product gas chromatographic analysis, the transformation efficiency that calculates crotonic aldehyde is 92.56%, and the selectivity of Ba Dousuan is 66.78%, and the molar yield of Ba Dousuan is 61.81%.
Embodiment 10:
In 1L high pressure tank reactor, add the crotonic aldehyde still liquid 300g after embodiment 1 distills, solvent toluene 275g, 0.39g Vanadium Pentoxide in FLAKES, the SiO that embodiment 5 newly makes
2Immobilized phospho-molybdic acid catalyzer 1.96g, 30 ℃ of control reaction temperature, reaction pressure 3atm, the aerating oxygen reaction is 1 hour continuously.The reaction product gas chromatographic analysis, the transformation efficiency that calculates crotonic aldehyde is 88.41%, and the selectivity of Ba Dousuan is 62.32%, and the molar yield of Ba Dousuan is 55.10%.
Embodiment 11:
In 1L high pressure tank reactor, add the crotonic aldehyde still liquid 100g after embodiment 2 distills, solvent benzol 440g, 0.16g Vanadium Pentoxide in FLAKES, γ-Al that embodiment 6 newly makes
2O
3Immobilized phospho-molybdic acid catalyzer 48.4g, 50 ℃ of control reaction temperature, reaction pressure 9atm, aerating oxygen is 8 hours continuously.The reaction product gas chromatographic analysis, the transformation efficiency that calculates crotonic aldehyde is 84.25%, and the selectivity of Ba Dousuan is 67.51%, and the molar yield of Ba Dousuan is 56.88%.
Embodiment 12:
In 1L high pressure tank reactor, add the crotonic aldehyde still liquid 150g after embodiment 2 distills, solvent acetic acid 560g, 0.45g Vanadium Pentoxide in FLAKES, the immobilized phospho-molybdic acid catalyzer of the beta-molecular sieve that embodiment 7 newly makes 22.5g, 100 ℃ of control reaction temperature, reaction pressure 9atm, the aerating oxygen reaction is 5 hours continuously.The reaction product gas chromatographic analysis, the transformation efficiency that calculates crotonic aldehyde is 92.64%, and the selectivity of Ba Dousuan is 68.57%, and the molar yield of Ba Dousuan is 63.52%.
Embodiment 13:
In 1L high pressure tank reactor, add the crotonic aldehyde still liquid 150g after embodiment 3 distills, solvent acetone 318g, 0.36g Vanadium Pentoxide in FLAKES, the immobilized phospho-molybdic acid catalyzer of the gac that embodiment 4 newly makes 18.1g, 45 ℃ of control reaction temperature, reaction pressure 7atm, the aerating oxygen reaction is 5 hours continuously.The reaction product gas chromatographic analysis, the transformation efficiency that calculates crotonic aldehyde is 80.83%, and the selectivity of Ba Dousuan is 61.35%, and the molar yield of Ba Dousuan is 49.59%.
Embodiment 14:
In 1L high pressure tank reactor, add the crotonic aldehyde still liquid 150g after embodiment 2 distills, solvent acetone 413g, 0.38g Vanadium Pentoxide in FLAKES, the immobilized phospho-molybdic acid catalyzer of the gac that embodiment 4 newly makes 18.8g, 50 ℃ of control reaction temperature, reaction pressure 5atm, the aerating oxygen reaction is 4 hours continuously.The reaction product gas chromatographic analysis, the transformation efficiency that calculates crotonic aldehyde is 93.15%, and the selectivity of Ba Dousuan is 68.31%, and the molar yield of Ba Dousuan is 63.63%.
Embodiment 15:
In 1L high pressure tank reactor, add the crotonic aldehyde still liquid 150g after embodiment 2 distills, solvent acetone 413g, catalyzer among the embodiment 14 filters the back and is recycling after 3 hours in air drying under 120 ℃ from reaction solution, 50 ℃ of control reaction temperature, reaction pressure 5atm, the aerating oxygen reaction is 4 hours continuously.The reaction result that reaction product gas chromatographic analysis, catalyzer repeatedly recycle is as shown in table 1.
Table 1
| Cycle index | Crotonic aldehyde transformation efficiency [%] | Ba Dousuan selectivity [%] | Ba Dousuan molar yield [%] |
| 1 | 92.85 | 68.17 | 63.30 |
| 2 | 92.82 | 67.96 | 63.08 |
| 3 | 92.59 | 68.03 | 63.00 |
| 4 | 92.43 | 67.58 | 62.46 |
| 5 | 92.51 | 67.66 | 62.59 |
| 6 | 92.42 | 67.32 | 62.22 |
| 7 | 91.98 | 67.11 | 61.73 |
| 8 | 92.03 | 67.25 | 61.89 |
Comparing embodiment 1:
The crotonic aldehyde content that adds not process distillation processing in 1L high pressure tank reactor is 23.37% by-product crotonic aldehyde 150g, solvent acetone 210g, 0.19g Vanadium Pentoxide in FLAKES, the immobilized phospho-molybdic acid catalyzer of the gac that embodiment 4 newly makes 9.55g, 45 ℃ of control reaction temperature, reaction pressure 5atm, the aerating oxygen reaction is 5 hours continuously.The reaction product gas chromatographic analysis, the transformation efficiency that calculates crotonic aldehyde is 65.50%, and the selectivity of Ba Dousuan is 56.13%, and the molar yield of Ba Dousuan is 36.77%.
Comparing embodiment 2:
The crotonic aldehyde content that adds not process distillation processing in 1L high pressure tank reactor is 33.54% by-product crotonic aldehyde 150g, solvent acetone 302g, 0.18g Vanadium Pentoxide in FLAKES, the immobilized phospho-molybdic acid catalyzer of the gac that embodiment 4 newly makes 9.15g, 45 ℃ of control reaction temperature, reaction pressure 5atm, the aerating oxygen reaction is 5 hours continuously.The reaction product gas chromatographic analysis, the transformation efficiency that calculates crotonic aldehyde is 72.57%, and the selectivity of Ba Dousuan is 61.46%, and the molar yield of Ba Dousuan is 44.60%.
Claims (8)
1, a kind of method of by-product crotonic aldehyde synthesizing crotonic acid may further comprise the steps:
1), the by-product crotonic aldehyde is carried out air distillation, control overhead product boiling point must concentrate the distillation kettle liquid of crotonic aldehyde at 25～65 ℃;
2) crotonic aldehyde that obtains with distillation kettle liquid is a raw material, in the presence of solvent, is Primary Catalysts with the phospho-molybdic acid, and Vanadium Pentoxide in FLAKES is a promotor, 30～100 ℃ of temperature of reaction, and pressure 0.3～0.9MPa, logical oxygen reaction 1～8 hour, reaction generates Ba Dousuan.
2, method according to claim 1 is characterized in that step 2) described phospho-molybdic acid is the loading type phospho-molybdic acid.
3, method according to claim 2 is characterized in that support of the catalyst is gac, SiO
2, γ-Al
2O
3, molecular sieve.
4, method according to claim 3 is characterized in that support of the catalyst is a gac.
5, method according to claim 2 is characterized in that the total consumption of phospho-molybdic acid and Vanadium Pentoxide in FLAKES is 1～10% of a crotonic aldehyde quality, and the mass ratio of phospho-molybdic acid and Vanadium Pentoxide in FLAKES is 30/1～10/4.
6, method according to claim 2 is characterized in that the total consumption of phospho-molybdic acid and Vanadium Pentoxide in FLAKES is a crotonic aldehyde quality 4～6%, and the mass ratio of phospho-molybdic acid and Vanadium Pentoxide in FLAKES is 20/1～10/1.
7, method according to claim 2 is characterized in that: reaction is recycling after 3 hours in air drying under 120 ℃ after catalyzer and the reaction product filtering separation after finishing, and catalyst activity is constant substantially.
8, method according to claim 2 is characterized in that comprising the steps: the carrying method of loading type phospho-molybdic acid catalyzer wherein
(1), gac is put into nitric acid or the hydrochloric acid soln of 1～6mol/L, left standstill at least 12 hours after 1～3 hour in room temperature to 100 a ℃ following heated and stirred, again with deionized water wash to neutral, oven dry; With SiO
2In 100～120 ℃ dry 4～5 hours down, again in retort furnace in 400～600 ℃ of calcinations 3～4 hours, cooling; γ-Al
2O
3, the molecular sieve pre-treatment is 400～500 ℃ of following roastings 4～6 hours;
(2), phospho-molybdic acid is dissolved in methyl alcohol, ethanol, acetone, the ether, be mixed with the phosphorus molybdenum acid solution that concentration is 0.05～0.3g/mL;
(3), the pretreated support of the catalyst of phosphorus molybdenum acid solution and step (1) for preparing is mixed, left standstill at least 12 hours after 5～10 hours, boil off solvent then 50～90 ℃ of following stirring and refluxing, 120～140 ℃ dry 24 hours down.
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| CN114349631A (en) * | 2022-01-14 | 2022-04-15 | 北京富盛嘉华医药科技有限公司 | Preparation method and application of 4-methoxy crotonic acid |
| CN114315557B (en) * | 2022-02-11 | 2022-06-10 | 北京弗莱明科技有限公司 | Production method of trans-2-butenoic acid with high yield |
| CN114560765B (en) * | 2022-03-02 | 2023-09-08 | 广西金源生物化工实业有限公司 | Industrial production method of crotonic acid by adopting microchannel reactor |
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