Process for producing hydroxy propyl cellulose with high substitution degree
A technology of hydroxypropyl and cellulose, which is applied in the field of producing highly substituted hydroxypropyl cellulose, can solve the problems of high concentration of propylene oxide, difficult control of side reactions, and difficult purification of by-products, etc., so as to improve the quality Stability, improving labor efficiency and production safety, and reducing labor intensity
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Embodiment 1
[0037] 1) Pulverization: Unpack 600 parts by mass of natural refined cellulose, pulverize it with a rotary knife pulverizer, and separate it through a cyclone separator to reach 0.03-0.15mm (about 80 meshes). ;
[0038] 2) Alkalinization: Add 8500 parts by mass of benzene solvent and 2000 parts by mass of ethanol solvent into the reaction kettle, start the mixer to stir, add 120 parts by mass of caustic soda, heat up to 60°C to alkalize, after the alkalizes , cool down to normal temperature, add the pulverized refined cellulose prepared in step 1), and alkalize at 20°C for 1 hour;
[0039] 3) Reaction: Add 1200 parts by mass of propylene oxide to the reactor, and the reaction is carried out in two steps:
[0040] In the first step, 55% propylene oxide is added to the reaction kettle. The reaction is divided into two stages. The reaction temperature of the first stage is 50°C, and the reaction time is 2 hours. The reaction temperature of the second stage is 75°C. The reactio...
Embodiment 2
[0049] 1) Pulverization: Unpack 600 parts by mass of natural refined cellulose, pulverize it with a rotary knife pulverizer, and separate it through a cyclone separator to reach 0.03-0.15mm (about 80 meshes). ;
[0050] 2) Alkalinization: Add 8500 parts by mass of toluene solvent and 1500 parts by mass of isopropanol solvent into the reaction kettle, start the mixer to stir, add 150 parts by mass of caustic soda, and heat up to 78°C to alkalize and alkalize After the end, cool down to normal temperature, add the pulverized refined cellulose prepared in step 1), and alkalize at 30°C for 0.8 hours;
[0051] 3) Reaction: Add 1500 parts by mass of propylene oxide to the reaction kettle, and the reaction is carried out in two steps:
[0052] In the first step, 40% propylene oxide is added to the reaction kettle. The reaction is divided into two stages. The reaction temperature of the first stage is 55°C, and the reaction time is 3 hours. The reaction temperature of the second sta...
Embodiment 3
[0061] 1) Pulverization: Unpack 600 parts by mass of natural refined cellulose, pulverize it with a rotary knife pulverizer, and separate it through a cyclone separator to reach 0.03-0.15mm (about 80 meshes). ;
[0062] 2) Alkalinization: Add 9000 parts by mass of xylene solvent and 1500 parts by mass of n-propanol solvent into the reaction kettle, start the mixer to stir, add 180 parts by mass of caustic soda, heat up to 70°C to catalyze the alkali, and After the alkali is finished, cool down to normal temperature, add the pulverized refined cellulose prepared in step 1), and alkalize at 25°C for 0.5 hours;
[0063] 3) Reaction: Add 1800 parts by mass of propylene oxide to the reactor, and the reaction is carried out in two steps:
[0064] In the first step, 50% propylene oxide is added to the reaction kettle. The reaction is divided into two stages. The reaction temperature of the first stage is 50°C, and the reaction time is 4 hours. The reaction temperature of the second...
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