After the water circulation in the vacuum system, what method can be used to remove all the water?
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After the water circulation in the vacuum system, what method can be used to remove all the water? The water content is required to be below 10PPM
There are many theoretical methods: drying, purging, washing with a volatile solvent and then drying. But I haven’t seen any specific examples, and I’m really looking forward to hearing about efficient methods from those with practical experience
The system is too large, making drying difficult; we wanted to use a hot nitrogen cycle, but some of the towers cannot be operated under pressure.
Yes, anyone can talk about theoretical aspects, but it’s difficult to find effective methods that have been actually put into use. Is water circulation used in large-scale chemical production? And how is that water removed? Or are the requirements for the remaining water lower after exclusion?
After the water-linked commissioning, operation is carried out using organic solvents; through the circulation of these solvents, water is delivered to the solvent recovery unit, where the solvents are recovered and the water is discharged
After the water interconnection of large systems, drying is carried out on a per-subsystem and per-device basis. For pipes, purging is commonly used; high-temperature, low-dewpoint dry gas is employed for purification. For vacuum equipment that cannot withstand pressure, vacuuming is performed, followed by repeated filling with low-dewpoint nitrogen to remove moisture gradually. For equipment that can tolerate a slight positive pressure, high-temperature, low-dewpoint gas is used for purification. There is also the method of using organic solvents to remove water, but the choice depends on the size of the system and the subsequent processing steps, as well as considerations regarding cost and residual organic solvents. Different approaches are required for the commissioning of different systems