CN112279773A - Synthesis method of high-quality m-phenylenediamine - Google Patents
Synthesis method of high-quality m-phenylenediamine Download PDFInfo
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- CN112279773A CN112279773A CN202011179650.9A CN202011179650A CN112279773A CN 112279773 A CN112279773 A CN 112279773A CN 202011179650 A CN202011179650 A CN 202011179650A CN 112279773 A CN112279773 A CN 112279773A
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- phenylenediamine
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- isophthalonitrile
- isophthalimide
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- WZCQRUWWHSTZEM-UHFFFAOYSA-N 1,3-phenylenediamine Chemical compound NC1=CC=CC(N)=C1 WZCQRUWWHSTZEM-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229940018564 m-phenylenediamine Drugs 0.000 title claims abstract description 36
- 238000001308 synthesis method Methods 0.000 title abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 44
- LAQPNDIUHRHNCV-UHFFFAOYSA-N isophthalonitrile Chemical compound N#CC1=CC=CC(C#N)=C1 LAQPNDIUHRHNCV-UHFFFAOYSA-N 0.000 claims abstract description 30
- YRCLULQVBWQJCG-UHFFFAOYSA-N 3-azabicyclo[3.3.1]nona-1(9),5,7-triene-2,4-dione Chemical compound C1=CC(C(=O)NC2=O)=CC2=C1 YRCLULQVBWQJCG-UHFFFAOYSA-N 0.000 claims abstract description 25
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000005708 Sodium hypochlorite Substances 0.000 claims abstract description 13
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 13
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims abstract description 13
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 12
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 12
- 239000003054 catalyst Substances 0.000 claims abstract description 7
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical group O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 10
- 238000000605 extraction Methods 0.000 claims description 9
- 238000004821 distillation Methods 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 7
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- 229910052681 coesite Inorganic materials 0.000 claims description 6
- 229910052906 cristobalite Inorganic materials 0.000 claims description 6
- 239000003960 organic solvent Substances 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 229910052682 stishovite Inorganic materials 0.000 claims description 6
- 229910052905 tridymite Inorganic materials 0.000 claims description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- KGRVJHAUYBGFFP-UHFFFAOYSA-N 2,2'-Methylenebis(4-methyl-6-tert-butylphenol) Chemical compound CC(C)(C)C1=CC(C)=CC(CC=2C(=C(C=C(C)C=2)C(C)(C)C)O)=C1O KGRVJHAUYBGFFP-UHFFFAOYSA-N 0.000 claims description 2
- FDPIMTJIUBPUKL-UHFFFAOYSA-N dimethylacetone Natural products CCC(=O)CC FDPIMTJIUBPUKL-UHFFFAOYSA-N 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 230000002194 synthesizing effect Effects 0.000 claims 9
- 239000002530 phenolic antioxidant Substances 0.000 claims 1
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 abstract description 4
- 238000003786 synthesis reaction Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 230000003647 oxidation Effects 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 12
- 230000003197 catalytic effect Effects 0.000 description 6
- 239000012295 chemical reaction liquid Substances 0.000 description 6
- 238000004817 gas chromatography Methods 0.000 description 6
- 238000006460 hydrolysis reaction Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000002481 ethanol extraction Methods 0.000 description 2
- 239000000469 ethanolic extract Substances 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 238000003811 acetone extraction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009903 catalytic hydrogenation reaction Methods 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
- C07C209/54—Preparation of compounds containing amino groups bound to a carbon skeleton by rearrangement reactions
- C07C209/58—Preparation of compounds containing amino groups bound to a carbon skeleton by rearrangement reactions from or via amides
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
- C07C209/82—Purification; Separation; Stabilisation; Use of additives
- C07C209/90—Stabilisation; Use of additives
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C231/00—Preparation of carboxylic acid amides
- C07C231/06—Preparation of carboxylic acid amides from nitriles by transformation of cyano groups into carboxamide groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C231/00—Preparation of carboxylic acid amides
- C07C231/06—Preparation of carboxylic acid amides from nitriles by transformation of cyano groups into carboxamide groups
- C07C231/065—By hydration using metals or metallic ions as catalyst
Abstract
The invention belongs to the technical field of petrochemical organic synthesis, and particularly relates to a synthesis method of high-quality m-phenylenediamine. The invention takes isophthalonitrile, anhydrous sodium carbonate and hydrogen peroxide as raw materials, and the isophthalonitrile, the anhydrous sodium carbonate and the hydrogen peroxide are synthesized into the isophthalimide under the action of a catalyst; and then reacting the isophthalimide with sodium hypochlorite, and after the reaction is finished, adding an antioxidant into the isophthalimide for post-treatment to obtain the m-phenylenediamine. The method has the advantages of simple synthesis process and simple post-treatment, effectively solves the problems of easy oxidation and low quality of the m-phenylenediamine, has the yield of more than 95 percent and the purity of more than 99 percent, greatly reduces the production cost, and meets the requirement of the market on high-quality resorcinol.
Description
Technical Field
The invention belongs to the technical field of petrochemical organic synthesis, and particularly relates to a synthesis method of high-quality m-phenylenediamine.
Background
M-phenylenediamine is white needle-like crystal, has a melting point of 62-63 ℃, and is a large amount of known fine chemicals with wide application in related fields such as petroleum, dye, pigment, medicine, pesticide, building auxiliary materials and the like. The traditional process adopts benzene as a starting material, and the process involves double nitration reaction in a nitric acid/sulfuric acid strong corrosive medium and subsequent metal catalysis and/or high-pressure hydrogenation double reduction reaction (iron powder reduction or catalytic hydrogenation, CN108164425, CN 107540554). In the traditional post-treatment process of the m-phenylenediamine, because the reaction solution contains a large amount of iron mud and wastewater which are difficult to treat, the yield is low (about 70 percent), the post-treatment is complex, the m-phenylenediamine product is easy to oxidize in the production process, the product purity is not high, and the high-purity and high-quality m-phenylenediamine is not in demand.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a synthesis method of high-quality m-phenylenediamine, and the product obtained by the method has high purity, high yield, simple post-treatment and low cost.
The invention relates to a synthesis method of high-quality m-phenylenediamine, which comprises the following steps:
(1) dissolving isophthalonitrile in dimethyl sulfoxide, adding anhydrous sodium carbonate and hydrogen peroxide, then adding a catalyst, reacting at 60-80 ℃, and filtering and washing to obtain isophthalimide after the reaction is finished;
(2) under the protection of nitrogen, dissolving sodium hypochlorite in water, controlling the temperature to be-5-20 ℃, adding the isophthalimide under rapid stirring, after the addition, carrying out heat preservation reaction for 2 hours, and then heating to 40-50 ℃ for reaction for 2-3 hours;
(3) and after the reaction is finished, adjusting the pH value of the reaction solution to 7.5-8.5, adding an antioxidant into the reaction solution, distilling under reduced pressure, extracting, and concentrating to obtain the m-phenylenediamine.
In the step (1), the addition amount of dimethyl sulfoxide is 10-15 times of the mass of isophthalonitrile, and the mass of anhydrous sodium carbonate is 5-10% of the mass of isophthalonitrile.
In the step (1), the catalyst is MnO2/SiO2Or Au/TiO2Or Raney-Cu, the adding amount of the catalyst is 0.5 to 2.0 percent of the mol amount of the isophthalonitrile.
In the step (1), the mass fraction of the hydrogen peroxide is 32%, and the molar ratio of the pure substances is as follows: h2O2＝1:1.2～1.3。
In the step (2), the mass of the water is 4.5-8.0 times of that of the sodium hypochlorite.
In step (2), the molar ratio of isophthalimide: sodium hypochlorite 1: 2.2-2.5.
In the step (3), the antioxidant is selected from hindered phenol antioxidants BBMBP or Cyanox2246 or BHT; antioxidant, in terms of mole ratios: isophthalimide is 0.5-1: 1.
In the step (3), after reduced pressure distillation, extracting the kettle substrate by using an organic solvent, wherein the amount of the organic solvent is 3-7 times of the weight of the isophthalimide, and equally dividing into three times of extraction. The organic solvent is selected from ethanol or dimethyl sulfoxide or acetone.
Compared with the prior art, the invention has the beneficial effects that: the synthesis process is simple, the post-treatment is simple, the problems of easy oxidation and low quality of the m-phenylenediamine are effectively solved, the yield reaches more than 95 percent, the purity reaches more than 99 percent, the production cost is greatly reduced, and the market demand on high-quality resorcinol is met.
Detailed Description
In order to better understand the technical scheme of the present invention, the following detailed description of the present invention is provided by way of examples, but the present invention should not be construed as limited to the above description.
The percentages mentioned in the following examples are given by mass.
Example 1
128g of isophthalonitrile is dissolved in 1280g of dimethyl sulfoxide, 12.8g of anhydrous sodium carbonate and 127.2g of 32% hydrogen peroxide are added into the reaction solution at a time, and then Au/TiO is added2，Au/TiO2The addition amount of the isophthalonitrile is 0.5 percent of the molar amount of the isophthalonitrile, the temperature is reduced after the catalytic hydrolysis reaction is carried out for 4 hours at the temperature of 80 ℃, and the reaction solution is filtered and washed to obtain 160.8g of pure product of the isophthalimide.
Under the protection of nitrogen, firstly, 160.4g of sodium hypochlorite is dissolved in 800g of water, 160.8g of isophthalimide is added under the condition of rapid stirring, the feeding temperature is controlled to be-5 ℃, the reaction is carried out for 2 hours under the heat preservation condition after the addition is finished, and then the temperature is raised to 50 ℃ for reaction for 2 hours;
after the reaction is finished, the temperature is reduced to normal temperature, hydrochloric acid is used for adjusting the pH value of reaction liquid to be 7.5, meanwhile, 0.9mol of antioxidant BHT is added, the water is removed by reduced pressure distillation, 500g of ethanol is used for extraction in three batches at the bottom of a kettle, the ethanol extraction liquid is concentrated to obtain 104.8g of offwhite product m-phenylenediamine, the yield is 97.0 percent based on isophthalonitrile, and the purity of the product m-phenylenediamine is 99.8 percent through gas chromatography detection.
Example 2
128g of isophthalonitrile is dissolved in 1280g of dimethyl sulfoxide, 12.8g of anhydrous sodium carbonate and 137.8g of 32% hydrogen peroxide are added to the reaction solution at a time, and MnO is added2/SiO2，MnO2/SiO2The addition amount of the compound is 0.5 percent of the molar amount of the isophthalonitrile, the temperature is reduced after the catalytic hydrolysis reaction is carried out for 5 hours at the temperature of 80 ℃, and the reaction solution is filtered and washed to obtain 158.8g of pure product of the isophthalimide.
Under the protection of nitrogen, firstly, 180g of sodium hypochlorite is dissolved in 1400g of water, 158.8g of isophthalimide is added under the condition of rapid stirring, the feeding temperature is controlled to be 20 ℃, the reaction is carried out for 2 hours after the feeding is finished, and then the temperature is raised to 50 ℃ for reaction for 3 hours;
after the reaction is finished, the temperature is reduced to normal temperature, hydrochloric acid is used for adjusting the pH value of reaction liquid to be 8.5, meanwhile, 0.5mol of antioxidant BHT is added, the water is removed by reduced pressure distillation, 1000g of ethanol is used for extraction in three batches at the bottom of a kettle, ethanol extract is concentrated to obtain 103.1g of off-white product m-phenylenediamine, the yield is 95.5 percent based on isophthalonitrile, and the purity of the product m-phenylenediamine is 99.7 percent detected by gas chromatography.
Example 3
128g of isophthalonitrile was dissolved in 1920g of dimethyl sulfoxide, and 6.4g of anhydrous sodium carbonate and 128.4g of 32% hydrogen peroxide were added to the reaction solution at a time, followed by addition of MnO2/SiO2，MnO2/SiO2The addition amount of the compound is 2.0 percent of the molar amount of the isophthalonitrile, the temperature is reduced after 5 hours of catalytic hydrolysis reaction at 60 ℃, and the reaction solution is filtered and washed to obtain 159.8g of pure product of the isophthalimide.
Under the protection of nitrogen, firstly, 166.7g of sodium hypochlorite is dissolved in 1000g of water, 159.8g of the intermediate isophthalimide is added under the rapid stirring, the feeding temperature is controlled to be minus 5 ℃, the reaction is carried out for 2 hours under the heat preservation after the addition is finished, and then the temperature is raised to 50 ℃ for reaction for 2 hours;
after the reaction is finished, the temperature is reduced to normal temperature, hydrochloric acid is used for regulating the pH value of reaction liquid to be 7.5, cyanox22460.6mol is added at the same time, reduced pressure distillation is carried out to remove water, 800g of ethanol is used for extraction at the bottom of a kettle in three batches, ethanol extract is concentrated to obtain an off-white product, namely m-phenylenediamine 103.8g, the yield is 96.1 percent based on the content of the isophthalonitrile, and the purity of the m-phenylenediamine is 99.5 percent through gas chromatography detection.
Example 4
128g of isophthalonitrile is dissolved in 1520g of dimethyl sulfoxide, 9g of anhydrous sodium carbonate and 130.6g of 32% hydrogen peroxide are added into the reaction solution at one time, then Raney-Cu is added, the addition amount of the Raney-Cu is 2.0% of the molar amount of the isophthalonitrile, the temperature is reduced after the catalytic hydrolysis reaction is carried out for 3h at the temperature of 60 ℃, and 161.8g of pure isophthalimide is obtained after the reaction solution is filtered and washed with water.
Under the protection of nitrogen, firstly, 161.4g of sodium hypochlorite is dissolved in 1130g of water, 161.8g of the intermediate isophthalimide is added under the condition of rapid stirring, the feeding temperature is controlled to be 10 ℃, the reaction is carried out for 2 hours under the heat preservation condition after the addition is finished, and then the temperature is raised to 40 ℃ for reaction for 3 hours;
after the reaction is finished, the temperature is reduced to normal temperature, hydrochloric acid is used for regulating the pH value of reaction liquid to be 8.0, 0.9mol of antioxidant BBMBP is added at the same time, the water is removed by reduced pressure distillation, 900g of ethanol is used for extraction in three batches at the bottom of a kettle, the ethanol extraction liquid is concentrated to obtain an off-white product m-phenylenediamine of 104.4g, the yield is 96.7 percent based on the content of isophthalonitrile, and the purity of the m-phenylenediamine product is 99.3 percent by gas chromatography detection.
Example 5
128g of isophthalonitrile is dissolved in 1660g of dimethyl sulfoxide, 10.2g of anhydrous sodium carbonate and 133.6g of 32% hydrogen peroxide are added to the reaction solution at a time, and then Au/TiO is added2，Au/TiO2The addition amount of the compound is 2.0 percent of the molar amount of the isophthalonitrile, the temperature is reduced after the catalytic hydrolysis reaction is carried out for 3.5h at the temperature of 65 ℃, and the reaction solution is filtered and washed to obtain 161.2g of pure isophthalimide.
Under the protection of nitrogen, firstly 182.7g of sodium hypochlorite is dissolved in 1000g of water, 161.2g of the intermediate isophthalimide is added under the condition of rapid stirring, the feeding temperature is controlled at 10 ℃, the reaction is carried out for 2 hours under the heat preservation condition after the addition is finished, and then the temperature is raised to 40 ℃ for reaction for 2 hours;
after the reaction is finished, the temperature is reduced to normal temperature, hydrochloric acid is used for regulating the pH value of reaction liquid to be 7.5, 0.6mol of antioxidant BBMBP is added at the same time, the water is removed by reduced pressure distillation, 900g of dimethyl sulfoxide is used for extraction in three batches at the bottom of a kettle, the extraction liquid of the dimethyl sulfoxide is concentrated to obtain 103.8g of off-white product m-phenylenediamine, the yield is 96.1 percent based on the isophthalonitrile, and the purity of the product m-phenylenediamine is 99.6 percent detected by gas chromatography.
Example 6
128g of isophthalonitrile is dissolved in 1600g of dimethyl sulfoxide, 9g of anhydrous sodium carbonate and 130.6g of 32% hydrogen peroxide are added into the reaction solution at one time, then Raney-Cu is added, the addition amount of the Raney-Cu is 1.0% of the molar amount of the isophthalonitrile, the temperature is reduced after the catalytic hydrolysis reaction is carried out for 3h at the temperature of 60 ℃, and the reaction solution is filtered and washed by water to obtain 160.0g of pure isophthalimide.
Under the protection of nitrogen, firstly 181.4g of sodium hypochlorite is dissolved in 1000g of water, 160.0g of the intermediate isophthalimide is added under the condition of rapid stirring, the feeding temperature is controlled to be 5 ℃, the reaction is carried out for 2 hours under the heat preservation after the addition is finished, and then the temperature is raised to 40 ℃ for reaction for 3 hours;
after the reaction is finished, the temperature is reduced to normal temperature, hydrochloric acid is used for adjusting the pH value of reaction liquid to be 8.5, antioxidant Cyanox22460.9mol is added at the same time, the reduced pressure distillation is carried out to remove the water, 1000g of acetone is used for extraction in three batches at the bottom of a kettle, the acetone extraction liquid is concentrated to obtain an off-white product, namely m-phenylenediamine 104.2g, the yield is 96.5 percent based on the content of the isophthalonitrile, and the purity of the m-phenylenediamine is 99.4 percent through gas chromatography detection.
Claims (9)
1. A method for synthesizing high-quality m-phenylenediamine is characterized by comprising the following steps:
(1) dissolving isophthalonitrile in dimethyl sulfoxide, adding anhydrous sodium carbonate and hydrogen peroxide, then adding a catalyst, reacting at 60-80 ℃, and filtering and washing to obtain isophthalimide after the reaction is finished;
(2) under the protection of nitrogen, dissolving sodium hypochlorite in water, controlling the temperature to be-5-20 ℃, adding the isophthalimide under rapid stirring, after the addition, carrying out heat preservation reaction for 2 hours, and then heating to 40-50 ℃ for reaction for 2-3 hours;
(3) and after the reaction is finished, adjusting the pH value of the reaction solution to 7.5-8.5, adding an antioxidant into the reaction solution, distilling under reduced pressure, extracting, and concentrating to obtain the m-phenylenediamine.
2. The method for synthesizing high-quality m-phenylenediamine according to claim 1, wherein in step (1), the amount of dimethyl sulfoxide added is 10 to 15 times the mass of isophthalonitrile, and the amount of anhydrous sodium carbonate is 5 to 10% of isophthalonitrile.
3. The method for synthesizing high-quality m-phenylenediamine according to claim 1, wherein in step (1), said catalyst is MnO2/SiO2Or Au/TiO2Or Raney-Cu, the adding amount of the catalyst is 0.5 to 2.0 percent of the mol amount of the isophthalonitrile.
4. The method for synthesizing high-quality m-phenylenediamine according to claim 1, wherein in step (1), the hydrogen peroxide is 32% by mass, and the molar ratio of the pure substances is isophthalonitrile: h2O2＝1:1.2～1.3。
5. The method for synthesizing high-quality m-phenylenediamine according to claim 1, wherein in the step (2), the mass of water is 4.5 to 8.0 times of the mass of sodium hypochlorite.
6. The method for synthesizing high-quality m-phenylenediamine according to claim 1, wherein in step (2), the molar ratio of isophthalimide: sodium hypochlorite 1: 2.2-2.5.
7. The method for synthesizing high-quality m-phenylenediamine according to claim 1, wherein in the step (3), said antioxidant is selected from hindered phenolic antioxidants BBMBP or Cyanox2246 or BHT; antioxidant, in terms of mole ratios: isophthalimide is 0.5-1: 1.
8. The method for synthesizing high-quality m-phenylenediamine according to claim 1, wherein in the step (3), after reduced pressure distillation, the still bottoms are extracted by using an organic solvent, the amount of the organic solvent is 3-7 times of the weight of the isophthalimide, and the extraction is divided into three times.
9. The method for synthesizing high-quality m-phenylenediamine according to claim 8, wherein said organic solvent is selected from the group consisting of ethanol, dimethyl sulfoxide and acetone.
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| PCT/CN2020/129931 WO2022088301A1 (en) | 2020-10-29 | 2020-11-19 | Method for synthesizing m-phenylenediamine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022088302A1 (en) * | 2020-10-29 | 2022-05-05 | 山东兴强化工产业技术研究院有限公司 | Preparation method for isophthalamide |
| WO2022088303A1 (en) * | 2020-10-29 | 2022-05-05 | 山东兴强化工产业技术研究院有限公司 | Method for preparing m-phenylenediamine |
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| JPH05255214A (en) * | 1992-03-11 | 1993-10-05 | Showa Denko Kk | Hydration of nitrile compound |
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| WO2022088303A1 (en) * | 2020-10-29 | 2022-05-05 | 山东兴强化工产业技术研究院有限公司 | Method for preparing m-phenylenediamine |
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