A kind of preparation method of alkyl ketene dimer
An alkyl ketene dimer and system technology, which is applied in the preparation/purification of carbon, the preparation of organic compounds, the preparation of carboxylate, etc., can solve the problem of affecting the adaptability of the alkyl ketene dimer and the expansion of the application range. , the adverse effect of alkyl ketene dimer sizing effect, the decline of alkyl ketene dimer sizing effect, etc., to achieve the effect of excellent long-term stability, excellent sizing effect, and excellent sizing performance
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Embodiment 1
[0033] A preparation method of alkyl ketene dimer, specifically as follows:
[0034] 1. Preparation of intermediates
[0035] Put a predetermined number of stearic acid into the intermediate reactor, with the heating rate of 2 ℃ / min, be warmed up to 75 ℃ insulation, 10RPM stirring 2h; Then under the stirring condition of 30RPM, with the feeding rate of 10mL / min, A predetermined number of catalysts were put in, and the temperature in the intermediate reactor was kept stable at 78° C. during the catalyst input process; after the catalyst was put in, the stirring was continued at 30 RPM for 20 min; 3 The feeding rate of / h, feeding carbonyl chloride; after the feeding of carbonyl chloride is completed, it is cooled naturally, and when it is cooled to 60 °C, 2 m 3 At a rate of / h, pure nitrogen was introduced for 0.5h; then a predetermined amount of modified activated carbon was put in, stirred at 10 RPM for 40 min, and the modified activated carbon was separated by suction filtr...
Embodiment 2
[0060] A preparation method of alkyl ketene dimer, specifically as follows:
[0061] 1. Preparation of intermediates
[0062] Put a predetermined number of stearic acid into the intermediate reactor, with a heating rate of 3 ℃ / min, heat up to 78 ℃ and keep warm, and stir at 15RPM for 2.5h; then under the stirring condition of 40RPM, with a feeding rate of 15mL / min , put in a predetermined number of catalysts, during the process of catalyst input, keep the temperature in the intermediate reactor stable at 80 ° C; after the catalyst input is completed, continue stirring at 40 RPM for 30 min; then at 75 m 3 The feeding rate of / h, feeding phosgene; after the feeding of phosgene is completed, it is cooled naturally, and when it is cooled to 65 °C, a 2.5 m 3 At the inflow rate of / h, pure nitrogen was introduced, and the nitrogen inflow time was 0.8h; then a predetermined amount of modified activated carbon was put in, stirred at 15 RPM for 50 min, and the modified activated carbo...
Embodiment 3
[0087] A preparation method of alkyl ketene dimer, specifically as follows:
[0088] 1. Preparation of intermediates
[0089]Put a predetermined number of stearic acid into the intermediate reactor, with a heating rate of 5 ℃ / min, heat up to 80 ℃ and keep warm, and stir at 20RPM for 3h; then under the stirring condition of 50RPM, with a feeding rate of 20mL / min, A predetermined number of catalysts were put in, and the temperature in the intermediate reactor was kept stable at 82° C. during the catalyst input process; after the catalyst was put in, the stirring was continued at 50 RPM for 50 min; 3 The feeding rate of / h is to feed phosgene; after the phosgene is fed, it is cooled naturally, and when it is cooled to 70 °C, 3 m 3 At a rate of / h, pure nitrogen was introduced for 1 h; then a predetermined number of modified activated carbons were put in, stirred at 20 RPM for 60 min, and the modified activated carbon was separated by suction filtration to obtain stearic acid chl...
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