A kind of preparation method and application of separable emulsion catalyst
A catalyst and emulsion technology, which is applied in the field of emulsion catalyst preparation, can solve the problems such as difficult recovery of catalysts and surfactants
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Embodiment 1
[0020] Dissolve 10 mmol of PEO-PPO-PEO triblock polymer with a molecular weight of 4200 and an HLB value of 14 into 100 mL of tetrahydrofuran, then add 10 mmol of allyl bromide to mix, and react at room temperature for 24 hours; distill under reduced pressure to remove tetrahydrofuran and unreacted Allyl bromide; then add 50mL triethoxysilane tetrahydrofuran solution with a concentration of 0.2mol / L; add 10ppm chloroplatinic acid as a catalyst, react at 50°C for 24h, cool and stand still. Then 2 mmol of phosphotungstic heteropoly salt was added, and 4 mmol of hydrochloric acid was added dropwise, and reacted at room temperature for 24 hours. After vacuum distillation, it was washed with cyclohexane, acetone, and acetonitrile in sequence, and dried in vacuum to obtain an emulsion catalyst.
[0021] 50mmol benzyl alcohol and 250mmol water were added to a 50mL airtight reaction vessel; then 60mmol of H 2 o 2 Into the above reaction system; then add an emulsion catalyst with a to...
Embodiment 2
[0023] Dissolve 10 mmol of PEO-PPO-PEO triblock polymer with a molecular weight of 8900 and an HLB value of 30 in tetrahydrofuran, then add 50 mmol of allyl bromide to mix, and react at room temperature for 48 hours; distill under reduced pressure to remove tetrahydrofuran and unreacted allyl base bromide; then add 100 mL of triethoxysilane tetrahydrofuran solution with a concentration of 0.2 mol / L; add 100 ppm of 1,3-divinyl-1,1,3,3-tetramethyldisiloxane platinum (0 ) as a catalyst, reacted at 30°C for 24h, cooled and stood still. Subsequently, 5 mmol phosphotungstic heteropoly salt was added, and 15 mmol hydrochloric acid was added dropwise, and reacted at room temperature for 24 hours. After vacuum distillation, it was washed with cyclohexane, acetone, and acetonitrile in sequence, and the emulsion catalyst was obtained after vacuum drying.
[0024] Add 50mmol benzyl alcohol and 1000mmol water to a 50mL airtight reactor; then add 60mmol H 2 o 2 Into the above reaction sys...
Embodiment 3
[0026] Dissolve 10 mmol of PEO-PPO-PEO triblock polymer with a molecular weight of 20,000 and an HLB value of 40 in tetrahydrofuran, then add 50 mmol of allyl bromide to mix, and react at room temperature for 48 hours; distill under reduced pressure to remove tetrahydrofuran and unreacted allyl base bromide; then add 100mL triethoxysilane tetrahydrofuran solution with a concentration of 0.2mol / L; add 100ppm 1,3-divinyl-1,1,3,3-tetramethyldisiloxane platinum (0 ) as a catalyst, reacted at 50°C for 24h, cooled and stood still. Subsequently, 5 mmol of phosphotungstic heteropoly salt was added, and 15 mmol of hydrochloric acid was added dropwise, reacted at room temperature for 24 hours, after vacuum distillation, washed with cyclohexane, acetone, and acetonitrile in sequence, and vacuum-dried to obtain an emulsion catalyst.
[0027] 50mmol benzyl alcohol and 500mmol water were added to a 50mL airtight reactor; then 60mmol H 2 o 2 Into the above reaction system; add an emulsion ...
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