Phosphorus acid monophenyl diisodecyl ester (Phosphorus acid monophenyl diisodecyl ester) is an important raw material for the production of chemicals, which is widely used in the fields of plastics, rubber and lubricating oil. This article will introduce the manufacturing method of Phosphorus acid monophenyl diisodecyl ester, including raw material preparation, reaction process, post-treatment and precautions.
I. Raw material preparation
1. Phenol: as the main raw material for the reaction, phenol should have high purity to ensure the quality of the product.
2. Isooctanol: as the raw material of alcohol for esterification reaction, isooctanol should also have high purity.
3. Phosphorous acid: as a phosphatizing agent, phosphorous acid needs to be strictly controlled for its purity and acidity.
II. Reaction process
1. Esterification reaction: add phenol and isooctanol into the reactor at the ratio of 1:2 molar ratio, heat it to 120-140℃, and carry out esterification reaction under the action of catalyst. The water generated during the reaction needs to be removed continuously to promote the reaction.
2. Phosphorylation reaction: After the esterification reaction is completed, lower the temperature to 80-90°C, add the calculated amount of phosphite, and continue to stir the reaction for 2-3 hours. In this process, phosphite and esterification products undergo phosphorylation reaction to produce monophenyl diisooctyl phosphite.
III. Post-treatment
1. Cooling: After the reaction, cool the reaction solution to room temperature.
2. Washing: Wash the reaction solution with sodium carbonate solution to remove the acidic impurities in it.
3. Splitting: The washed reaction solution is split to separate the organic and aqueous phases.
4. Drying: add a desiccant, such as anhydrous sodium sulfate, to the organic phase, stir and dry for a period of time, then filter to remove the desiccant.
5. Distillation: The dried organic phase is distilled to collect fractions of the target product monoisooctyl diphenyl phosphite.
4. Precautions
1. Strictly control the purity and proportion of raw materials to ensure the quality and yield of the product.
2. During the esterification reaction, the water generated needs to be removed continuously to facilitate the reaction.
3. During the phosphating reaction, proper temperature and reaction time should be controlled to avoid excessive phosphating or incomplete reaction.
4. The post-treatment process should pay attention to the operation specification and safety to avoid pollution to the environment.
In conclusion, the manufacturing method of monoisooctyl diphenyl phosphite involves two key steps, esterification reaction and phosphorylation reaction, which requires strict control of the operating conditions and parameters in the preparation of raw materials, the reaction process, and the post-treatment to ensure the quality and yield of the product. Meanwhile, the production process should follow the principle of safety and environmental protection to reduce the impact on the environment.
