CN109096096B - Free radical protective agent for preparing adipic acid by direct oxidation of cyclohexane - Google Patents
Free radical protective agent for preparing adipic acid by direct oxidation of cyclohexane Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
- C07C51/31—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation of cyclic compounds with ring-splitting
- C07C51/313—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation of cyclic compounds with ring-splitting with molecular oxygen
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- C—CHEMISTRY; METALLURGY
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- C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
- C07B61/00—Other general methods
- C07B61/02—Generation of organic free radicals; Organic free radicals per se
Abstract
The invention relates to a free radical protective agent for preparing adipic acid by directly oxidizing cyclohexane, which mainly solves the problem that a free radical catalyst is easy to deactivate and decompose in the reaction for preparing adipic acid by directly oxidizing cyclohexane in the prior art. A free radical protectant for adipic acid produced by direct oxidation with cyclohexane, comprising at least one of citric acid and/or a substituted phenol of the formula; wherein, X and Y are independently selected from H or tertiary butyl, and X and Y are not H technical scheme at the same time, have solved this problem well, can be used for the industrial production of adipic acid of direct oxidation of cyclohexane.
Description
Technical Field
The invention relates to a free radical protective agent for preparing adipic acid by directly oxidizing cyclohexane.
Background
Adipic acid (adipic acid), also known as adipic acid, is an important organic diacid, and is an important raw material for preparing polyurethane and nylon 66. The international application field of adipic acid in nylon 66 is over 70 percent, and the international application field of adipic acid in polyurethane is 78 percent. At present, the world has four methods for producing adipic acid, namely a phenol method, a cyclohexane method, a cyclohexene method, a butadiene method and the like. Before the fifty years, the production of adipic acid mainly uses phenol as a raw material, and the production of adipic acid by using a phenol method is a more classical method. But the phenol resource is limited, the price is expensive, the product cost is high, and the phenol is basically eliminated at present. The modern industrial production mainly adopts a cyclohexane method, the yield of which accounts for about 93 percent of the total yield, and the method mainly comprises two steps of adipic acid synthesis. The first step of oxidizing cyclohexane to give cyclohexanol and cyclohexanone (KA oil), followed by separation of the reaction mixture, recycling of unreacted cyclohexane, and the second step of oxidizing the KA oil to adipic acid with nitric acid. The method has the advantages that: the process is mature, the process is dominant in the production of adipic acid, byproducts are mainly succinic acid and glutaric acid, the separation is easy, and the product is relatively pure. The disadvantages are as follows: in the process of synthesizing KA oil, the conversion per pass is low, the conversion rate is generally 5% -12%, and a large amount of strong acid and strong alkali solution is needed, so that equipment is corroded, and the environment is polluted; in the second step, in the process of preparing adipic acid by oxidizing KA oil, the used oxidant is nitric acid, 68 percent of nitric acid is consumed for producing 1t of adipic acid product, the corrosion to equipment is serious, and a large amount of nitrogen oxide compounds which seriously pollute the environment can be generated.
In order to solve the problem, researchers explore a more environment-friendly and simple process route for synthesizing adipic acid by taking cyclohexane as a raw material and air or oxygen as an oxidant.
Chinese invention patents CN 1247501C (title of the invention: cyclohexane catalytic oxidation process), CN 1218922C (title of the invention: method for preparing adipic acid by air oxidation of hexacyclic carbon ring compound) and CN 1231449C (title of the invention: method for preparing adipic acid by biomimetic catalytic oxygen oxidation of cyclohexane) disclose methods for preparing adipic acid by air oxidation of cyclohexane using metalloporphyrin as a catalyst. Chinese invention patents CN 101239899B (title of the invention: a method for preparing adipic acid by one-step catalytic oxidation of cyclohexane) and CN 101337878B (title of the invention: a method for directly producing adipic acid by catalytic oxidation of cyclohexane) disclose a method for preparing adipic acid by one-step oxidation of cyclohexane by using a carbon material as a carrier to load a nano ruthenium dioxide catalyst or directly as a catalyst.
In the literature Organic Process Research&Development 1998,2,255-260 (article title: Direct Conversion of cyclic hexane in o-adaptive Acid with Molecular oxygenated catalyst bound by N-Hydroxyphthalimide bound with Mn (acac)2and Co(OAc)2) In Ishii et al used a free radical catalyst NHPI with the addition of a small amount of a transition metal promoter to oxidize cyclohexane directly to adipic acid with oxygen. The reaction was carried out in acetic acid solvent with NHPI (10 mol%) and manganese acetylacetonate (1 mol%) as catalysts at 100 ℃ for 20 hours, with a cyclohexane conversion of 73% and an adipic acid yield of 53%.
The methods well solve the problem of synthesis of adipic acid from various angles, but have some defects and shortcomings, for example, in the existing preparation methods of many adipic acids, the conversion rate of cyclohexane is low, the selectivity of adipic acid is low, carriers used in some methods are expensive and difficult to prepare, organic small molecules are used as free radical catalysts to catalyze and oxidize the adipic acid, although the conversion rate of cyclohexane and the selectivity of adipic acid are improved, the used free radical catalysts are volatile and active to decompose and cannot be recycled, and the like, and a certain distance is left from industrial production of adipic acid.
Disclosure of Invention
The invention provides a free radical protective agent for preparing adipic acid by directly oxidizing cyclohexane, which aims to solve the technical problem that a free radical catalyst is easy to deactivate and decompose in the reaction for preparing adipic acid by directly oxidizing cyclohexane in the prior art.
The second technical problem to be solved by the invention is a method for preparing adipic acid by directly oxidizing cyclohexane by adopting the free radical protective agent.
In order to solve one of the technical problems of the invention, the technical scheme of the invention is as follows:
a free radical protectant for preparing adipic acid by direct oxidation of cyclohexane comprises at least one of citric acid and/or substituted phenol shown as formula I:
wherein X and Y are independently selected from H or tert-butyl, and X and Y are not both H.
The relative positions of X, Y and OH are not particularly limited, and the technical effects of the present invention can be obtained.
In the above technical solution, the radical protectant preferably includes both citric acid and substituted phenol, which have a synergistic effect in reducing the decomposition rate of the radical catalyst.
In the above technical scheme, the substituted phenol is preferably at least one of p-tert-butylphenol and 2, 6-di-tert-butylphenol.
In the above technical scheme, the molar ratio of citric acid to substituted phenol is preferably (0.1-1) to (0.1-1).
In the above technical solution, the radical protectant further preferably comprises (R)1O)(R2O)(R3O) a phosphite triester represented by P, wherein R1～R3Independently selected from aryl of C6-C10 or alkyl of C1-C10. In this case, citric acid and the triester of phosphorous acid, and the substituted phenol and the triester of phosphorous acid, have synergistic effects in reducing the decomposition rate of the radical catalyst, and it has been surprisingly found that the radical protectant of the present invention, including citric acid, the substituted phenol and the triester of phosphorous acid, has a better combined synergistic effect.
In the above technical scheme, the molar ratio of citric acid to substituted phenol to phosphoric acid triester is preferably (0.1-1): 0.1-1) (0.1-1.5).
To solve the second technical problem, the technical solution of the present invention is as follows:
a method for preparing adipic acid by directly oxidizing cyclohexane comprises the steps of taking acetic acid or acetonitrile as a solvent, taking oxygen-containing gas as an oxidizing agent, and carrying out an oxidation reaction on cyclohexane in the presence of a free radical protective agent, a metal catalyst and a free radical catalyst in the technical scheme to obtain the adipic acid.
In the above technical solution, the metal catalyst may be selected from those commonly used in the art, such as but not limited to at least one of Co, Cu and Mn, and more preferably the above three metal elements.
In the above technical scheme, the radical catalyst is not particularly limited, and those commonly used in the art can be selected, for example, but not limited to, at least one selected from N-hydroxyphthalimide (NHPI), N-hydroxysuccinimide (NHS), and derivatives having these as a skeleton structure.
In the above technical scheme, the reaction temperature is preferably 70-120 ℃.
In the above-mentioned technical means, the reaction pressure is preferably 1 to 5MPa in terms of gauge pressure.
The pressures are gage pressuresThe selectivity of the product adipic acid is detected by liquid phase HPLC. The solid-liquid mixed product obtained by the reaction of preparing adipic acid by oxidizing cyclohexane is electromagnetically stirred and dissolved by water and methanol in a ratio of 90:10(V/V), and is filtered and diluted into a high-efficiency liquid phase for detection. Chromatographic analysis conditions: the chromatography column model is ZORBAX SAX 4.6mm X250 mm 5 μm, and the mobile phase is methanol: 50mmol/L KH2PO4The column temperature was 25 ℃, the flow rate was 1.0mL/min, the amount of sample was 20 μ L, and the detection wavelength was 210 nm.
By adopting the technical scheme of the invention, the deactivation rate of the free radical catalyst NHS is lower than 20 percent, and is higher than 70 percent compared with the deactivation rate of NHS in the prior art, so that the technical effect is better, and the method can be used for industrial production of adipic acid by directly oxidizing cyclohexane.
The invention is further illustrated by the following examples.
Detailed Description
[ example 1 ]
Adding 5mol of acetic acid, 0.02mol of NHS, 0.01mol of cobalt acetate, 0.01mol of manganese acetate, 0.01mol of copper acetate, 1mol of cyclohexane, 0.01mol of p-tert-butylphenol, 0.01mol of citric acid and 0.01mol of triphenyl phosphite into a 1-step-up pressure reaction kettle (provided with a reflux condensing device communicated with the atmosphere through a pressure-backup valve), sealing and stirring, heating to 90 ℃, continuously introducing air at 5 liters/min, controlling the pressure in the kettle to be kept at 3MPa all the time, cooling to room temperature after reacting for 5 hours, taking out a reaction mixture for analysis, and analyzing the result: cyclohexane conversion was 52%, adipic acid selectivity was 83%, and NHS decomposition rate after the reaction was 6%, and the main reaction conditions and the reaction results are shown in table 1 for convenience of comparison.
[ example 2 ]
Adding 5mol of acetic acid, 0.02mol of NHPI, 0.01mol of cobalt acetate, 0.01mol of manganese acetate, 0.01mol of copper acetate, 1mol of cyclohexane, 0.01mol of p-tert-butylphenol and 0.01mol of triphenyl phosphite into a 1-step pressure-rising reaction kettle (provided with a reflux condensing device communicated with the atmosphere through a pressure-backup valve), sealing and stirring, heating to 90 ℃, continuously introducing air at 5 liters per minute, controlling the pressure in the kettle to be kept at 3MPa, reacting for 5 hours, cooling to room temperature, taking out a reaction mixture for analysis, and analyzing the result: the cyclohexane conversion was 47%, the adipic acid selectivity was 81%, and the NHS decomposition rate after the reaction was 12%. The main reaction conditions and the reaction results are shown in Table 1 for convenience of comparison.
[ example 3 ]
Adding 5mol of acetic acid, 0.02mol of NHS, 0.01mol of cobalt acetate, 0.01mol of manganese acetate, 0.01mol of copper acetate, 1mol of cyclohexane, 0.01mol of citric acid and 0.01mol of triphenyl phosphite into a 1-step-up pressure reaction kettle (provided with a reflux condensing device communicated with the atmosphere through a pressure-backup valve), sealing and stirring, heating to 90 ℃, continuously introducing air at 5 liters per minute, controlling the pressure in the kettle to be kept at 3MPa all the time, reacting for 5 hours, cooling to room temperature, taking out a reaction mixture for analysis, and analyzing the result: cyclohexane conversion was 42%, adipic acid selectivity was 78%, and NHS decomposition rate after reaction was 18%, and the main reaction conditions and the reaction results are shown in table 1 for convenience of comparison.
[ example 4 ]
Adding 5mol of acetic acid, 0.02mol of NHS, 0.01mol of cobalt acetate, 0.01mol of manganese acetate, 0.01mol of copper acetate, 1mol of cyclohexane, 0.01mol of p-tert-butylphenol and 0.01mol of trinonyl phosphite into a 1-liter pressure reaction kettle (provided with a reflux condensing device communicated with the atmosphere through a pressure-backup valve), sealing and stirring, heating to 90 ℃, continuously introducing air at 5 liters/min, controlling the pressure in the kettle to be kept at 3MPa, cooling to room temperature after 5 hours of reaction, taking out a reaction mixture for analysis, and analyzing the result: cyclohexane conversion of 45%, adipic acid selectivity of 76% and NHS decomposition of 15% after the reaction, the main reaction conditions and the reaction results are shown in table 1 for convenience of comparison.
[ example 5 ]
Adding 5mol of acetic acid, 0.02mol of NHS, 0.01mol of cobalt acetate, 0.01mol of manganese acetate, 0.01mol of copper acetate, 1mol of cyclohexane, 0.05mol of p-tert-butylphenol, 0.01mol of citric acid and 0.01mol of triphenyl phosphite into a 1-step-up pressure reaction kettle (provided with a reflux condensing device communicated with the atmosphere through a pressure-backup valve), sealing and stirring, heating to 90 ℃, continuously introducing air at 5 liters/min, controlling the pressure in the kettle to be kept at 3MPa all the time, cooling to room temperature after reacting for 5 hours, taking out a reaction mixture for analysis, and analyzing the result: cyclohexane conversion was 48%, adipic acid selectivity was 82%, and NHS decomposition rate after reaction was 8%, and the main reaction conditions and the reaction results are shown in table 1 for convenience of comparison.
[ example 6 ]
Adding 5mol of acetic acid, 0.02mol of NHS, 0.01mol of cobalt acetate, 0.01mol of manganese acetate, 0.01mol of copper acetate, 1mol of cyclohexane, 0.01mol of p-tert-butylphenol, 0.05mol of citric acid and 0.01mol of triphenyl phosphite into a 1-step-up pressure reaction kettle (provided with a reflux condensing device communicated with the atmosphere through a pressure-backup valve), sealing and stirring, heating to 90 ℃, continuously introducing air at 5 liters/min, controlling the pressure in the kettle to be kept at 3MPa all the time, cooling to room temperature after reacting for 5 hours, taking out a reaction mixture for analysis, and analyzing the result: cyclohexane conversion was 46%, adipic acid selectivity was 79%, and NHS decomposition rate after the reaction was 10%, and the main reaction conditions and the reaction results are shown in table 1 for convenience of comparison.
[ example 7 ]
Adding 5mol of acetic acid, 0.02mol of NHS, 0.01mol of cobalt acetate, 0.01mol of manganese acetate, 0.01mol of copper acetate, 1mol of cyclohexane, 0.01mol of p-tert-butylphenol and 0.01mol of citric acid into a 1-liter high-pressure reaction kettle (provided with a reflux condensing device communicated with the atmosphere through a pressure-backup valve), sealing and stirring, heating to 90 ℃, continuously introducing air at 5 liters per minute, controlling the pressure in the kettle to be kept at 3MPa, cooling to room temperature after 5 hours of reaction, taking out a reaction mixture for analysis, and analyzing the result: cyclohexane conversion was 40%, adipic acid selectivity was 82%, and NHS decomposition rate after the reaction was 13%, and the main reaction conditions and the reaction results are shown in table 1 for convenience of comparison.
[ example 8 ]
Adding 5mol of acetic acid, 0.02mol of NHS, 0.01mol of cobalt acetate, 0.01mol of manganese acetate, 0.01mol of copper acetate, 1mol of cyclohexane, 0.01mol of 2, 6-di-tert-butylphenol and 0.01mol of triphenyl phosphite into a 1-step-up pressure reaction kettle (provided with a reflux condensing device communicated with the atmosphere through a pressure-backup valve), sealing and stirring, heating to 90 ℃, continuously introducing air at 5 liters per minute, controlling the pressure in the kettle to be kept at 3MPa, reacting for 5 hours, cooling to room temperature, taking out a reaction mixture for analysis, and analyzing the result: cyclohexane conversion was 42%, adipic acid selectivity was 76%, and NHS decomposition rate after reaction was 16%, and the main reaction conditions and the reaction results are shown in table 1 for convenience of comparison.
[ example 9 ]
Adding 5mol of acetic acid, 0.02mol of NHS, 0.01mol of cobalt acetate, 0.01mol of manganese acetate, 0.01mol of copper acetate, 1mol of cyclohexane and 0.01mol of triphenyl phosphite into a 1-step-up pressure reaction kettle (provided with a reflux condensing device communicated with the atmosphere through a pressure-backup valve), sealing and stirring, heating to 90 ℃, continuously introducing air at 5 liters/minute, controlling the pressure in the kettle to be kept at 3MPa all the time, reacting for 5 hours, cooling to room temperature, taking out a reaction mixture for analysis, and analyzing the result: cyclohexane conversion was 32%, adipic acid selectivity was 77%, and NHS decomposition rate after reaction was 58%, and the main reaction conditions and the reaction results are shown in table 1 for convenience of comparison.
[ example 10 ]
Adding 5mol of acetic acid, 0.02mol of NHS, 0.01mol of cobalt acetate, 0.01mol of manganese acetate, 0.01mol of copper acetate, 1mol of cyclohexane and 0.01mol of p-tert-butylphenol into a 1-step pressure-rising reaction kettle (provided with a reflux condensing device communicated with the atmosphere through a pressure-backup valve), hermetically stirring, heating to 90 ℃, continuously introducing air at 5 liters/minute, controlling the pressure in the kettle to be kept at 3MPa all the time, reacting for 5 hours, cooling to room temperature, taking out a reaction mixture for analysis, and analyzing the result: cyclohexane conversion 36%, adipic acid selectivity 76%, NHS decomposition 62% after the reaction, and the prevailing reaction conditions and reaction results are presented in table 1 for comparison.
[ example 11 ]
Adding 5mol of acetic acid, 0.02mol of NHS, 0.01mol of cobalt acetate, 0.01mol of manganese acetate, 0.01mol of copper acetate, 1mol of cyclohexane and 0.01mol of citric acid into a 1-liter high-pressure reaction kettle (provided with a reflux condensing device communicated with the atmosphere through a pressure-backup valve), hermetically stirring, heating to 90 ℃, continuously introducing air at 5 liters/minute, controlling the pressure in the kettle to be kept at 3MPa all the time, reacting for 5 hours, cooling to room temperature, taking out a reaction mixture for analysis, and analyzing the result: cyclohexane conversion was 35%, adipic acid selectivity was 78%, and NHS decomposition rate after reaction was 64%, and the main reaction conditions and the reaction results are shown in table 1 for convenience of comparison.
[ COMPARATIVE EXAMPLE 1 ]
Adding 5mol of acetic acid, 0.02mol of NHS, 0.01mol of cobalt acetate, 0.01mol of manganese acetate, 0.01mol of copper acetate and 1mol of cyclohexane into a 1-step pressure-rising reaction kettle (provided with a reflux condensing device communicated with the atmosphere through a pressure-backup valve), sealing and stirring, heating to 90 ℃, continuously introducing air at 5 liters/min, controlling the pressure in the kettle to be kept at 3MPa, reacting for 5 hours, cooling to room temperature, taking out a reaction mixture for analysis, and analyzing the result: cyclohexane conversion was 28%, adipic acid selectivity was 74%, and NHS decomposition rate after reaction was 75%, and the main reaction conditions and the reaction results are shown in table 1 for convenience of comparison.
TABLE 1
Note: in the test, 5mol of acetic acid, 0.02mol of NHS, 0.01mol of cobalt acetate, 0.01mol of manganese acetate, 0.01mol of copper acetate and 1mol of cyclohexane were used.
Claims (9)
1. A method for preparing adipic acid by directly oxidizing cyclohexane comprises the steps of taking acetic acid or acetonitrile as a solvent, taking oxygen-containing gas as an oxidant, and carrying out an oxidation reaction on cyclohexane in the presence of a free radical protective agent, a metal catalyst and a free radical catalyst to obtain adipic acid; wherein the free radical protective agent contains at least one of citric acid and/or substituted phenol shown as the formula I:
wherein X and Y are independently selected from H or tert-butyl, and X and Y are not both H.
2. The method of claim 1, wherein the substituted phenol is selected from at least one of p-tert-butylphenol and 2, 6-di-tert-butylphenol.
3. The method of claim 1, wherein the molar ratio of citric acid to substituted phenol is (0.1-1) to (0.1-1).
4. The process according to claim 1, wherein the radical protectant further comprises (R)1O)(R2O)(R3O) a phosphite triester represented by P, wherein R1～R3Independently selected from aryl of C6-C10 or alkyl of C1-C10.
5. The method of claim 4, wherein the molar ratio of the citric acid to the substituted phenol to the phosphorous acid triester is (0.1-1) - (0.1-1) (0.1-1.5).
6. The method according to claim 1, characterized in that the metal catalyst is selected from at least one of Co, Cu and Mn.
7. The process according to claim 1, characterized in that the radical catalyst is selected from at least one of N-hydroxyphthalimide, N-hydroxysuccinimide or derivatives with their skeletal structure.
8. The process according to claim 1, wherein the reaction temperature is from 70 to 120 ℃.
9. The process according to claim 1, wherein the reaction pressure is from 1 to 5MPa in gauge.
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