Internal pressure vacuum membrane distillation concentration method of ethylene glycol solution
A vacuum membrane distillation and ethylene glycol technology, which is applied to the internal pressure vacuum membrane distillation technology to concentrate and process ethylene glycol solution, and the use of membrane distillation technology to concentrate and process the ethylene glycol solution field can solve problems such as membrane hydrophilicity and achieve treatment High efficiency, reduced hydrophilization problems, low operating pressure effects
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Embodiment 1
[0038] process flow advice 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), triethylene glycol Alcohol (TEG) 0.5% (wt), the rest is ethylene glycol aqueous 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 at a temperature of 90°C into the raw water tank; secondly, pump the ethylene glycol aqueous solution in the raw water tank into the tube side of the hollow fiber membrane module at a specific membrane surface flow rate through the feed pump; finally, pump the The permeation side of the hollow fiber membra...
Embodiment 2
[0046] process flow advice figure 1 . The main water quality characteristics of the ethylene glycol solution in the ethylene glycol hydration process are the same as in Example 1.
[0047] 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:
[0048] 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 in the raw water tank into the tube side of the hollow fiber membrane module at a specific membrane surface flow rate through the feed pump; finally, Vacuumize the permeate side of the hollow fiber membrane module, that is, the shell side. Under the action of vacuuming, the water vapor in the ethylene glycol aqueous solution passes through the membrane pores and conde...
Embodiment 3
[0053] process flow advice figure 1 . The main water quality characteristics of the ethylene glycol solution in the ethylene glycol hydration process are the same as in Example 1.
[0054] 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:
[0055] First, pump the ethylene glycol aqueous solution at a temperature of about 95°C into the raw water tank; secondly, pump the ethylene glycol aqueous solution in the raw water tank into the tube side of the hollow fiber membrane module at a specific membrane surface flow rate through the feed pump; finally, Vacuumize the permeate side of the hollow fiber membrane module, that is, the shell side. Under the action of vacuuming, the water vapor in the ethylene glycol aqueous solution passes through the membrane pores and condens...
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Abstract
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