A method for refining polyether polyol using bipolar membrane electrodialysis system
A bipolar membrane electrodialysis and polyether polyol technology is applied in the field of polyether polyol to achieve the effects of short production cycle, green and simple process, and reduced production cost
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Embodiment 1
[0037] (1) Surface modification of the cation exchange membrane by dipping method.
[0038] The first step, pretreatment: take a 600*1200mm PVA cation exchange membrane, wash the membrane surface impurities with deionized water, and then soak it in absolute ethanol for 2 hours before use.
[0039] The second step is to prepare the immersion solution: stir 50ml of butyl titanate and 50ml of absolute ethanol with a magnetic stirrer for 1 hour, and then slowly and continuously drop in (45min added) with 50ml of absolute ethanol, 5ml of water and 2.5ml of concentrated hydrochloric acid. The resulting mixture was continued to stir for 1 h before use.
[0040] The third step, dip coating: the cation exchange membrane of the first step is immersed in the dipping solution of the second step, taken out after 4 hours, heat-treated at 90°C for 12 hours, and washed with water for use.
[0041] (2) Build as image 3 The bipolar membrane electrodialysis device shown, the anode and cathode...
Embodiment 2
[0045] (1) Surface modification of the cation exchange membrane by dipping method.
[0046] The first step, pretreatment: take a 600*1200mm PVA cation exchange membrane, wash the membrane surface impurities with deionized water, and then soak it in absolute ethanol for 2 hours before use.
[0047] The second step is to prepare the immersion solution: stir 15ml of butyl titanate and 10ml of absolute ethanol with a magnetic stirrer for 1 hour, and then slowly and continuously drop in (35min added), which is made up of 50ml of absolute ethanol, 1.5ml of water and 10ml of acetic acid The mixture was continued to stir for 1 h before use.
[0048] The third step, dipping coating: the cation exchange membrane of the first step is immersed in the dipping solution of the second step, taken out after 2 hours, heat treated at 90°C for 24 hours, washed with water for use.
[0049] (2) Build as image 3 The bipolar membrane electrodialysis device shown is different from Example 1 in that...
Embodiment 3
[0053] (1) Surface modification of the cation exchange membrane by dipping method.
[0054] The first step, pretreatment: take a 600*1200mm PVA cation exchange membrane, wash the membrane surface impurities with deionized water, and then soak it in absolute ethanol for 2 hours before use.
[0055] The second step is to prepare the immersion solution: stir 15ml of isopropyl titanate and 15ml of absolute ethanol with a magnetic stirrer for 1 hour, then slowly and continuously drop in (60min added), which is made up of 60ml of absolute ethanol, 3ml of water and 10ml of acetic acid The mixture was continued to stir for 1 h before use.
[0056] The third step, dipping coating: the cation exchange membrane of the first step is immersed in the dipping solution of the second step, taken out after 3 hours, heat treated at 100°C for 16 hours, and washed with water for use.
[0057] (2) Build as image 3 The bipolar membrane electrodialysis device shown differs from Example 1 in that t...
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