Concentration Method of Ethylene Glycol Solution by Dissolved Air Vacuum Membrane Distillation
A vacuum membrane distillation, ethylene glycol technology, applied in chemical instruments and methods, pervaporation, preparation of organic compounds, etc., can solve problems such as membrane hydrophilicity, achieve high processing efficiency, low operating temperature, and reduce hydrophilization. effect of the problem
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Embodiment 1
[0038] For a schematic diagram of the process, see figure 1 .
[0039] The main water quality characteristics of the ethylene glycol solution in the ethylene glycol hydration process of ethylene oxide are: monoethylene glycol (MEG): 14% (wt), diethylene glycol (DEG): 0.5% (wt), three Ethylene glycol (TEG): 0.5% (wt), the rest is an aqueous ethylene glycol solution of water.
[0040] The membrane module used is a polytetrafluoroethylene (PTFE) hollow fiber hydrophobic membrane module with a membrane pore size of 0.2 μm. There are two groups of hollow fiber hydrophobic membrane modules, which are used alternately. The process is as follows:
[0041]First, pump the ethylene glycol aqueous solution with a temperature of about 90°C into the raw water tank; secondly, pump the ethylene glycol aqueous solution and air in the raw water tank into the tube of the hollow fiber membrane module at a specific membrane surface flow rate and gas-liquid ratio through the dissolved air pump. ...
Embodiment 2
[0046] The main water quality characteristics of the ethylene glycol solution in the ethylene glycol hydration process are the same as in Example 1.
[0047] For a schematic diagram of the process, see figure 1 .
[0048] The membrane module used is a polytetrafluoroethylene (PTFE) hollow fiber hydrophobic membrane module with a membrane pore size of 0.2 μm. There are two groups of hollow fiber hydrophobic membrane modules, which are used alternately. The process is as follows:
[0049] First, pump the ethylene glycol aqueous solution with a temperature of about 85°C into the raw water tank; secondly, pump the ethylene glycol aqueous solution and nitrogen in the raw water tank into the tube of the hollow fiber membrane module at a specific membrane surface flow rate and gas-liquid ratio through the dissolved air pump. Finally, vacuumize the permeate side of the hollow fiber membrane module, that is, the shell side. Under the action of vacuum, the water vapor and nitrogen in...
Embodiment 3
[0054] The main water quality characteristics of the ethylene glycol solution in the ethylene glycol hydration process are the same as in Example 1.
[0055] For a schematic diagram of the process, see figure 1 .
[0056] The membrane module used is a polytetrafluoroethylene (PTFE) hollow fiber hydrophobic membrane module with a membrane pore size of 0.2 μm. There are two groups of hollow fiber hydrophobic membrane modules, which are used alternately. The process is as follows:
[0057] First, pump the ethylene glycol aqueous solution with a temperature of about 85°C into the raw water tank; secondly, pump the ethylene glycol aqueous solution and nitrogen in the raw water tank into the tube of the hollow fiber membrane module at a specific membrane surface flow rate and gas-liquid ratio through the dissolved air pump. Finally, vacuumize the permeate side of the hollow fiber membrane module, that is, the shell side. Under the action of vacuum, the water vapor and nitrogen in...
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