A kind of preparation method and application of water-soluble polyacrylic acid supported tempo catalyst
A technology of polyacrylic acid and catalyst, which is applied in catalytic reactions, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of poor catalytic oxidation of cellulose, achieve high selectivity, save production costs, and reduce waste water Effect
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Embodiment 1
[0023] 1. Preparation of water-soluble catalyst PAA-PTMA11%
[0024] 1) In a constant temperature oil bath, add 1.4g of n-dodecanethiol, 35g of isopropanol and 10ml of deionized water into a 500ml reactor, and stir; mix 35g of acrylic acid and 35g of isopropanol to form solution A, and 1.4g of Dissolve ammonium sulfate in 30ml deionized water to make solution B; when the temperature of the material rises to 80°C, use a peristaltic pump to add solution A and solution B dropwise at the same time, the dropping rate of solution A is 0.5ml / min, and the dropping rate of solution B After the dropwise addition, the reaction was continued for 3 hours to obtain a colorless viscous polyacrylic acid solution. After cooling, isopropanol and water were distilled off under reduced pressure, then vacuum-dried and pulverized to obtain 34.5 g of polyacrylic acid PAA.
[0025] 2) Under nitrogen protection, ultrasonically disperse 3.0 g of polyacrylic acid PAA (containing 0.042 mol of carboxyl gr...
Embodiment 2
[0032] 1. Preparation of water-soluble catalyst PAA-PTMA26%
[0033] 1) In a constant temperature oil bath, add 1.0g of n-dodecanethiol, 35g of isopropanol and 10ml of deionized water into a 500ml reactor, and stir; mix 35g of acrylic acid and 35g of isopropanol to form solution A, and 1.0g of Dissolve ammonium sulfate in 30ml deionized water to make solution B; when the temperature of the material rises to 82°C, use a peristaltic pump to add solution A and solution B dropwise at the same time, the dropping rate of solution A is 0.5ml / min, and the dropping rate of solution B After the dropwise addition, the reaction was continued for 3 hours to obtain a colorless viscous polyacrylic acid solution. After cooling, isopropanol and water were distilled off under reduced pressure, then vacuum-dried and pulverized to obtain 34.3 g of polyacrylic acid PAA.
[0034] 2) Under the protection of nitrogen, ultrasonically disperse 4.0g of polyacrylic acid PAA (containing 0.056mol of carbox...
Embodiment 3
[0041] 1. Preparation of water-soluble catalyst PAA-PTMA37%
[0042] 1) In a constant temperature oil bath, add 0.7g of n-dodecanethiol, 35g of isopropanol and 10ml of deionized water into a 500ml reactor, and stir; mix 35g of acrylic acid and 35g of isopropanol to form solution A, and 0.7g of Dissolve ammonium sulfate in 30ml deionized water to make solution B; when the temperature of the material rises to 85°C, use a peristaltic pump to add solution A and solution B dropwise at the same time, the dropping rate of solution A is 0.5ml / min, and the dropping rate of solution B 0.25ml / min; after the dropwise addition, continue the reaction for 3h to obtain a colorless viscous polyacrylic acid solution. After cooling, distill under reduced pressure to remove isopropanol and water, then vacuum dry and pulverize to obtain 34.8g polyacrylic acid PAA.
[0043] 2) Under the protection of nitrogen, ultrasonically disperse 2.0g of polyacrylic acid PAA (containing 0.028mol of carboxyl gro...
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