Process for preparing low-free-alkali sodium methoxide methanol solution based on alkaline method
A methanol solution and sodium methoxide technology, which is used in the preparation of metal alcohols, sustainable manufacturing/processing, separation/purification of hydroxyl compounds, etc., can solve problems such as easy damage, reduce waste, improve mechanical properties, and achieve reasonable design.
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Embodiment 1
[0036] Preparation of vapor permeable membrane:
[0037] S1: Add polyvinyl alcohol and 4-methylumbelliferyl-β-D-xylopyranoside (the mass ratio of the two is 19.2:1) to deionized water (the mass ratio of polyvinyl alcohol to deionized water is 1: 13.6), keep stirring at 85°C for 4h to form a homogeneous solution;
[0038] S2: Lower the temperature to 55°C, add adipaldehyde with a concentration of 24% dropwise to make it account for 0.52% of the total solution, and maintain the pH of the solution at 3.0 with sulfuric acid with a concentration of 24wt%, and continue stirring for 2 hours to obtain a mixed solution M ;
[0039] S3: Immerse the PAN hollow fiber membrane in the mixed solution M described in step S2 for 15 minutes, take it out and hang it to dry, then immerse it in the mixed solution M again, take it out and hang it upside down to dry to obtain a vapor permeable membrane. Among them, the thickness of the functional film on both sides is 62±4.5 μm.
Embodiment 2
[0041] The difference between the preparation of vapor permeable membrane and embodiment 1 is:
[0042] In step S1, the mass ratio of polyvinyl alcohol to 4-methylumbelliferyl-B-D-xylopyranoside is 18.8:1, and the mass ratio of polyvinyl alcohol to deionized water is 1:12.7;
[0043] The amount of adipaldehyde added in step S2 is 0.45% of the total mass of the mixed solution.
Embodiment 3
[0045] The difference between the preparation of vapor permeable membrane and embodiment 1 is:
[0046] In step S1, the mass ratio of polyvinyl alcohol to 4-methylumbelliferyl-B-D-xylopyranoside is 19.7:1, and the mass ratio of polyvinyl alcohol to deionized water is 1:14.3;
[0047] The amount of adipaldehyde added in step S2 is 0.55% of the total mass of the mixed solution.
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