A process for producing fuel-grade anhydrous butanol by a double-membrane method without rectification
A double-membrane method, butanol technology, applied in the field of membrane separation, can solve problems such as unfavorable continuity of biological butanol, complicated separation process, etc., to improve fermentation efficiency and bioalcohol yield, excellent separation performance, and inhibit product inhibition effect. Effect
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[0045] Examples of the preparation of alcohol-preferential membranes:
[0046] The porous base membrane is polysulfone (PSf) flat-plate ultrafiltration membrane, the molecular weight cut-off is 20000, the high molecular polymer used is PDMS (viscosity is 20000mPa s), the solvent is n-heptane, and the high-temperature baking lamp selected is Yuba heating lamp .
[0047] Preparation method and steps:
[0048] Step a. Dissolve 10wt.% PDMS into 100mL n-heptane, stir for 1 hour and then add covalent organic framework material COF-42. The loading of COF-42 is 0.5wt.% of the polymer, and ultrasonically mix for 30 minutes. Evenly, then add 1wt.% ethyl orthosilicate and 0.05wt.% dibutyltin dilaurate, continue to stir for 0.5h, and prepare a COF-42 / PDMS mixed membrane solution;
[0049] Step b. Under the condition that the ambient humidity is 20% lower, cut the pretreated PSf base film into a disc with a diameter of 20 cm and immerse it in the COF-42 / PDMS mixed film solution described...
Embodiment 1
[0073] The temperature of the feed liquid is 80°C (controlled by the water bath 1, measured by the digital thermometer 6), the flow rate of the feed liquid is 27L / h (controlled by the peristaltic pump 2, the valve 8 is adjusted, and measured by the flow meter 10), and the membrane permeates The side pressure is 200Pa (controlled by vacuum pump 13 and measured by vacuum 12), and the effective evaluation area of the membrane in the membrane pool is 26.4cm 2 .
[0074] (1) Using the low-concentration n-butanol aqueous solution in the simulated fermentation product as the initial feed liquid 3, prepare 500 mL of n-butanol aqueous solution with a n-butanol mass fraction of 3 wt.%.
[0075] (2) Pass the 3wt.% n-butanol aqueous solution into the preferential alcohol pervaporation membrane pool 5 by the peristaltic pump 2, and make it contact with the membrane surface of the preferential alcohol permeable membrane 7; The gaseous phase component of crossing membrane is cooled by col...
Embodiment 2
[0080] The temperature of the feed liquid is 80°C (controlled by the water bath 1, measured by the digital thermometer 6), the flow rate of the feed liquid is 27L / h (controlled by the peristaltic pump 2, the valve 8 is adjusted, and measured by the flow meter 10), and the membrane permeates The side pressure is 200Pa (controlled by vacuum pump 13 and measured by vacuum 12), and the effective evaluation area of the membrane in the membrane pool is 26.4cm 2 .
[0081] (1) Using the low-concentration n-butanol aqueous solution in the simulated fermentation product as the initial feed liquid 3, prepare 500 mL of n-butanol aqueous solution with a n-butanol mass fraction of 4wt.%.
[0082] (2) Pass the 4wt.% n-butanol aqueous solution into the preferential alcohol pervaporation membrane pool 5 through the peristaltic pump 2, and make it contact with the membrane surface of the preferential alcohol permeable membrane 7; The gaseous phase component of crossing membrane is cooled by...
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