Manufacturing method of monophenyl diisodecyl phosphite
Monophenyl diisodecyl phosphite is an important raw material for the production of chemicals, which is widely used in the fields of plastics, rubber and lubricating oil. In this paper, a manufacturing method of monobenzene diisodecyl phosphite will be introduced.
I. Raw materials and equipment
1. Raw materials: phenol, isodecanol, phosphorus trichloride, sodium hydroxide.
2. Equipment: reaction kettle, stirrer, thermometer, condenser, water separator, oil pump, filter and so on.
2. Manufacturing steps
1. Add phenol and isodecanol into the reaction kettle at the ratio of molar ratio of 1:2, turn on the stirrer, and heat up to 80-90℃.
2. In another reaction kettle, phosphorus trichloride was added with sodium hydroxide in the ratio of molar ratio 1:1.2, and heated to 80-90°C with stirring to generate sodium phosphite.
3. Slowly add the generated sodium phosphite to the mixture of phenol and isodecanol, control the dosing rate and keep the reaction temperature at 100-110°C, meanwhile turn on the condenser and reflux split water.
4. After the addition is completed, continue to stir the reaction for 2-3 hours, then reduce the temperature to 50-60 ℃, add a small amount of activated carbon decolorization, filtration to remove activated carbon.
5. Vacuum distillation, collect the fraction of 180-200℃/2kPa, which is monobenzene diisodecyl phosphite.
3. Precautions
1. The temperature should be strictly controlled during operation to prevent too high or too low temperature from affecting the reaction.
2. The speed of adding needs to be moderate, to avoid too fast leading to uneven reaction.
3. Vacuum distillation needs to control the vacuum degree and distillation temperature to ensure product quality.
Four, product quality indexes
The product quality indexes of Isodecyl diphenyl phosphite are as follows: appearance is colorless transparent liquid, acid value ≤0.5mgKOH/g, ester content ≥98%, moisture ≤0.1%. V. Safety and environmental protection
1. Strictly follow the safety operation regulations and wear protective gears during operation to prevent acid and alkali burns and other accidents.
2. Waste materials need to be properly disposed of to avoid pollution to the environment.
6. Yield and cost
The yield of this manufacturing method is about 85%, and the cost is affected by the price of raw materials, equipment depreciation, labor costs and other factors, the specific cost needs to be accounted for according to the actual situation.
Summary: This paper describes a manufacturing method of monodiphenyl isodecyl phosphite, which is easy to operate, the raw materials are easy to obtain, the yield is high, and it is suitable for industrialized production. At the same time, the operation process should pay attention to safety and environmental protection issues to ensure product quality and production efficiency.
