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Method for preparing ethyl alcohol through cassava

A cassava and ethanol technology, applied in biofuels, fermentation, etc., can solve the problems of large steam consumption, low yield, loss of fermentable substances, etc., and achieve the effect of saving steam

Inactive Publication Date: 2013-12-25
徐大鹏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the ethanol production process using cassava as raw material generally adopts high-temperature and high-pressure cooking method for liquefaction, which will cause the loss of fermentable substances in the raw material, consume a large amount of steam, and result in low yield, resulting in increased production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Crush the cassava to a fine powder with a particle size of 1.2 mm, add water 2.5 times the weight of the cassava and stir well, add amylase at a ratio of 5 U / g cassava, and liquefy at 96°C for 20 minutes to obtain a liquefied slurry; measure the total amount of cassava in the liquefied slurry Sugar content is 25.1%;

[0017] 2) Cool down the cassava liquefied slurry to 58°C in vacuum, add sulfuric acid to adjust the pH to 4.5 by injection, then add glucoamylase to the cassava liquefied slurry at a ratio of 150U / g cassava and keep it saccharified for 40 minutes to obtain mash;

[0018] 3) Inoculate the activated yeast into the mash with an amount of 0.5‰ of the cassava weight, pre-ferment at 31°C for 5 hours, then adjust the temperature to 38°C, and carry out the main fermentation for 18 hours. Fermentation continued for 34 hours, and mature mash was obtained at the end of fermentation; the ethanol content in the mature mash was determined to be 18.2%, and the starch ...

Embodiment 2

[0021] 1) Crush the cassava to a fine powder with a particle size of 1.5 mm, add water 3.0 times the weight of the cassava and stir well, add amylase at a ratio of 10 U / g cassava, and liquefy at 98°C for 30 minutes to obtain a liquefied slurry; measure the total amount of cassava in the liquefied slurry The sugar content is 26.6%;

[0022] 2) Cool down the cassava liquefaction slurry to 62°C in vacuum, add sulfuric acid to adjust the pH to 5.0 by injection, then add glucoamylase to the cassava liquefaction slurry at a ratio of 200U / g cassava and keep saccharification for 50 minutes to obtain mash;

[0023] 3) Inoculate the activated yeast into the mash with an amount of 1‰ of the cassava weight, pre-ferment at 33°C for 10 hours, then adjust the temperature to 40°C, and carry out the main fermentation for 24 hours. After the main fermentation, enter the post-fermentation. The fermentation continued for 40 hours, and the mature mash was obtained at the end of the fermentation; t...

Embodiment 3

[0026] 1) Crush the cassava to a fine powder with a particle size of 1.4 mm, add water 2.8 times the weight of the cassava and stir well, add amylase at a ratio of 8 U / g cassava, and liquefy at 97°C for 25 minutes to obtain a liquefied slurry; measure the total amount of cassava in the liquefied slurry The sugar content is 27.8%;

[0027] 2) Cool down the cassava liquefaction slurry to 60°C in vacuum, add sulfuric acid by injection to adjust the pH to 4.8, then add glucoamylase to the cassava liquefaction slurry at a ratio of 180U / g cassava and keep it saccharified for 45 minutes to obtain mash;

[0028] 3) Inoculate the activated yeast into the mash with an amount of 0.8‰ of the cassava weight, pre-ferment at 32°C for 8 hours, then adjust the temperature to 39°C, and carry out the main fermentation for 22 hours. The fermentation continued for 38 hours, and the mature mash was obtained at the end of the fermentation; the ethanol content in the mature mash was determined to be ...

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Abstract

The invention discloses a method for preparing ethyl alcohol through cassava. The method for preparing the ethyl alcohol through the cassava comprises the steps of cassava liquidation, saccharification, fermentation and extraction of the ethyl alcohol in a distilling mode. According to the step of cassava liquidation, the cassava is smashed and is evenly mixed up with water, amylase is added to the liquefied cassava according to the proportion 5-10U / g, and then the cassava is liquefied for 20-30 minutes at the temperature of 96-98 GEG C to obtain the liquefied pulp liquid. According to the step of saccharification, the pulp liquid obtained by liquefying the cassava is cooled to be at 58-62 DEG C in a vacuum mode, sulfuric acid is added in an injection mode to adjust the pH value to be 4.5-5.0, then saccharifying enzyme is added to the liquefied cassava pulp liquid according to the proportion of 150-200U / g, and heat-preservation saccharification is carried out for 40-50 minutes. By means of the method for preparing the ethyl alcohol through the cassava, a low-temperature liquidation method is adopted, the total content of sugar in the liquefied pulp liquid is large than or equal to 25%, the starch convert ratio is larger than or equal to 53%, microbiological contamination is not caused easily, steam consumption is smaller than or equal to 0.7 ton / ton ethyl alcohol, energy consumption is largely reduced, and production cost is lowered.

Description

technical field [0001] The invention relates to a method for preparing ethanol, in particular to a method for preparing ethanol from cassava. Background technique [0002] Cassava is a food and economic crop widely planted in the tropics and subtropics. It has strong adaptability, tolerance to drought, barrenness, and water. It has low requirements on soil quality and can grow in various soils. The starch content of cassava is relatively high. The root starch content of cassava reaches 25-30%, and the dry starch content of cassava reaches about 70%. It is known as the "king of starch" and is a promising raw material for alcohol production. Using cassava as raw material to produce fuel alcohol can speed up the country's escape from the oil crisis and reduce environmental pollution, which has great strategic significance and social benefits. [0003] In the prior art, the ethanol production process using cassava as raw material generally adopts high-temperature and high-press...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/06C12P19/14
CPCY02E50/10
Inventor 徐大鹏冯英
Owner 徐大鹏