Method for preparing anhydrous alcohol
An anhydrous ethanol and ethanol fermentation technology, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of restricting the development of anhydrous ethanol, high cost, and large amount of gas permeable membranes used
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preparation example Construction
[0020] According to the method for preparing dehydrated alcohol provided by the invention, the method may further comprise the steps:
[0021] (1) under the condition of vacuum distillation, the ethanol fermentation mash is distilled to obtain the first gas phase product and distillation raffinate;
[0022] (2) cooling the first gas-phase product, and performing gas-liquid separation to obtain the first aqueous ethanol solution and the second gas-phase product;
[0023] (3) heating and vaporizing the first aqueous ethanol solution to obtain a third gas phase product;
[0024] (4) Under the gas membrane separation condition, the third gas phase product is permeated and separated by a gas permeable membrane, and anhydrous ethanol gas and residual gas are recovered.
[0025] Wherein, the vacuum distillation has no special dependence on equipment, and can be carried out using various known gas-liquid mass transfer equipment capable of completing vacuum distillation. In order to b...
preparation example
[0062] This preparation example is used to prepare ethanol fermentation mash.
[0063] 100 parts by weight of corn were pulverized to obtain a pulverized product with an average particle diameter of 1500 microns, and the pulverized product was mixed with 220 parts by weight of water to obtain a starch slurry. At 50° C., the obtained starch slurry was mixed with α-amylase (purchased from Novozymes) to obtain a mixture, and the pH value of the mixture was adjusted to 5, and kept for 50 minutes to obtain an enzymatic hydrolysis product. Wherein, 20 enzyme activity units of α-amylase are added according to the dry weight per gram of the pulverized product. Lower the temperature of the enzymatic hydrolyzate to 33°C, and inoculate 10 5 Alcoholic yeast with colony-forming units (Anqi super Saccharomyces cerevisiae high active dry yeast, Hubei Angel Yeast Co., Ltd.), the resulting mixture was stirred and cultured in a fermenter at 33°C for 65 hours to obtain ethanol fermentation mash...
Embodiment 1
[0065] use figure 1 In the process flow shown, the ethanol fermentation mash obtained in the preparation example is heated to 67° C. in a heat exchanger, and the feed is fed from the feed port of the F1 type valve tower. In the F1 type valve tower, the number of theoretical plates is 24. The pressure at the top of the tower is 0.035MPa, the temperature is 60°C, the pressure at the bottom of the tower is 0.05MPa, and the temperature is 80°C. The number of theoretical plates between the feed inlet and the bottom of the tower accounts for the total number of theoretical plates in the F1 type float valve tower 90% of the board count. The gas distilled from the top of the tower is the first gas phase product. The distillation raffinate is extracted and heated to 90°C, and then returned to the bottom of the F1 valve tower for flash vaporization.
[0066] Condensing the first gaseous product above in a heat exchanger, the temperature at the outlet of the first gaseous product in th...
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