What type of vacuum pump should I choose during drying?
Thread Content
I have an organic intermediate that is slightly soluble in water. Its suspension solution still contains about 2% moisture after being separated by a centrifuge. However, the user requires that the moisture content be lower than 0.2%, and it cannot reach such a low moisture level even if it is exposed to the sun. Therefore, I want to use vacuum drying. The problem is that The melting point of the material is low. The melting point of the pure material is about 70-75°C. As the water content increases, the melting point decreases accordingly. Therefore, the drying temperature at the beginning cannot exceed 40°C. Later, as the water content decreases, the drying temperature can be increased accordingly. I would like to ask all experts, the initial drying temperature should not be higher than 40°C, and what should be the corresponding vacuum degree during drying? If the air pumping volume is considered to be 70 liters/minute, what should be the ultimate vacuum degree of the selected vacuum pump? What type of vacuum pump should be selected for such dry conditions? Thanks!
After centrifuge separation, it still contains about 2% moisture, indicating that the material is very loose and should be easier to dry. I have also encountered your material. I use a rotary double cone dryer that can be vacuumed. The jacket is heated with hot water at about 50 degrees. The volume of 1 cubic meter can dry 600L of material at a time. The vacuum pump uses an oil-free lubrication vertical vacuum pump WLW-50, and the pump motor is 4KW. Generally, drying can be completed in 4 to 8 hours.