Seeking advice on the reasons for variations in the quality of silicone monomer products
Thread Content
After the silicone monomer synthesis plant is put into operation, the quality of the crude monomer mixture remains good for only a short period of time – generally 7 to 10 days – after which its quality deteriorates rapidly. This is manifested by an increase in the levels of monoalkyl hydrogen and monoalkyl compounds; sometimes the level of monoalkyl compounds rises gradually while the level of monoalkyl hydrogen increases more slowly, and at other times the level of monoalkyl hydrogen rises quickly followed by an increase in the level of monoalkyl compounds. Sometimes, the price of methyl hydrogen and that of methyl increase simultaneously. Those of you involved in silicone production – do any of you know what causes such changes?
The issues related to synthesis are quite complex. However, the market conditions for D4 and DMC are poor at the moment, while hydrogenated silicone oils are still in good demand; it’s not a bad thing to produce more hydrogenated products as well. By carrying out a disproportionation reaction between monoform and triform, diform can also be obtained.
Different factories use different catalysts, and the proportions of various additives affect the composition of the crude monomer; this requires adjustment based on experience. After all, there are significant differences among fluidized bed systems, so it’s not possible to make generalizations!
It’s also related to the structure of the fluidized bed! ! ! The proportion of silicon powder also has a significant impact! ! ! It is recommended to conduct an experiment
Fluidized bed reactions are relatively complex and variable. This includes adjustments to the catalytic system; factors such as bed temperature, gas flow rate, silicon powder particle size, and bed height have a significant impact. It’s most important to pay close attention and draw lessons from experience.
The addition of catalyst must be adjusted continuously based on the yield of crude monomer; it’s not a one-time solution! Sometimes a class needs to be adjusted several times
After the silicone monomer synthesis plant is put into operation, the quality of the crude monomer mixture remains good for only a short period of time – generally 7 to 10 days – after which its quality deteriorates rapidly. This is manifested by an increase in the levels of monoalkyl hydrogen and monoalkyl compounds; sometimes the level of monoalkyl compounds rises gradually while the level of monoalkyl hydrogen increases more slowly, and at other times the level of monoalkyl hydrogen rises quickly followed by an increase in the level of monoalkyl compounds. Sometimes, the hydrogen content in methyl group and the price of methyl group rise simultaneously. Those who are involved in silicone production – does anyone know what causes such changes? I think it might be: 1. Unstable operating parameters ； 2. There are changes in the raw material components of chloromethane and silicon powder ； 3. There is a lack of in-depth understanding regarding the adjustment of catalyst combination formulations, and the mechanism of action of each component in the catalyst has not been properly understood ；