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Method for producing ethanol by fermenting raw thick mash at low temperature

A technology of thick mash fermentation and ethanol, applied in the direction of microorganism-based methods, biochemical equipment and methods, fermentation, etc., can solve the problems of time and energy consumption, reduce production costs, etc., save the cooking process, reduce the amount of steam, Avoid the effects of substrate inhibition

Inactive Publication Date: 2011-02-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention overcomes the time-consuming and energy-consuming shortcomings of raw material pretreatment liquefaction, cooking and saccharification in the prior art, and provides a method for producing ethanol by fermenting low-temperature raw meal thick mash. reduce manufacturing cost

Method used

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  • Method for producing ethanol by fermenting raw thick mash at low temperature
  • Method for producing ethanol by fermenting raw thick mash at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to the process route figure 1 As shown, carry out low-temperature raw material dense mash fermentation to produce ethanol, the specific steps are as follows:

[0024] 1. Utilize dried cassava flakes as a raw material, after the dried cassava flakes are pulverized, calculate with process water by weight, add 1.7 parts of process water to 1 part of cassava dry flakes for batching, and obtain a powder slurry with a mass concentration of 33.3%;

[0025] 2. The above-mentioned slurry is heated to 80° C., calculated by the weight of the dried cassava slices, and 50 units of amylase is added to each gram of the dried cassava slices to carry out low-temperature liquefaction treatment, wherein the liquefaction temperature is 80° C. and the time is 45 minutes;

[0026] 3. Cool the mash after the above-mentioned liquefaction treatment to normal temperature (28° C.), add 100 units of glucoamylase per gram of cassava dry flakes, and insert it into brewer's yeast (Saccharom...

Embodiment 2

[0034] According to the process route figure 1 As shown, carry out low-temperature raw material dense mash fermentation to produce ethanol, the specific steps are as follows:

[0035] 1. Using fresh cassava as raw material, cassava is pulverized, and process water is calculated by weight, 1 part of fresh cassava is added to 1.7 parts of process water for batching, and a powder slurry with a mass concentration of 30% is obtained;

[0036] 2. The above-mentioned slurry is heated to 75°C, calculated according to the weight of the dried cassava slices, and 30 units of amylase is added to each gram of the dried cassava slices to carry out low-temperature liquefaction treatment, wherein the liquefaction temperature is 75°C and the time is 60 minutes;

[0037] 3. Cool the mash after the above-mentioned liquefaction treatment to normal temperature (30° C.), calculate by the weight of cassava dry slices, add 80 units of glucoamylase per gram of cassava dry slices, insert brewing yeast ...

Embodiment 3

[0045] According to the process route figure 1 As shown, carry out low-temperature raw material dense mash fermentation to produce ethanol, the specific steps are as follows:

[0046] 1. Using fresh cassava as raw material, cassava is pulverized, and process water is calculated by weight, 1 part of fresh cassava is added to 1.7 parts of process water for batching, and a powder slurry with a mass concentration of 30% is obtained;

[0047] 2. The above-mentioned slurry is heated to 70°C, calculated according to the weight of the dried cassava slices, and 30 units of amylase is added to each gram of the dried cassava slices to carry out low-temperature liquefaction treatment, wherein the liquefaction temperature is 70°C and the time is 30 minutes;

[0048] 3. Cool the mash after the above-mentioned liquefaction treatment to normal temperature (32° C.), calculate by the weight of cassava dry slices, add 120 units of glucoamylase per gram of cassava dry slices, insert brewer’s yeas...

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Abstract

The invention discloses a method for producing ethanol by fermenting raw thick mash at a low temperature. The method comprises the following steps of: (1) preparing over 30 mass percent powder syrup; (2) adding 30 to 50 unit / gram of amylase into the powder syrup to liquefy the powder syrup at a low temperature; (3) cooling the liquefied powder syrup to normal temperature and adding yeast and saccharifying enzyme for saccharifying and fermenting the raw thick mash synchronously, measuring the yeast concentration once every 2 hours 6 to 10 hours after fermentation, adjusting the feeding speed of the saccharifying enzyme according to the concentration change of yeast cells, entering a post maturation stage after primary fermentation is performed for 32 to 36 hours, stopping feeding the saccharifying enzyme so as to obtain mature mash 32 to 36 hours later, wherein the concentration of initial yeast is 50,000,000 / milliliter, the initial adding amount of the saccharifying enzyme is 80 to 120 units into every gram of raw material and the saccharifying enzyme is fed at the initial speed value of 5.5 units / gram of raw material every hour; and (4) rectifying the mature mash so as to obtain the ethanol. The method is simple and convenient and has low material consumption, low energy consumption and low production cost.

Description

technical field [0001] The patent of the present invention relates to a method for producing ethanol, in particular to a method for producing ethanol by fermenting low-temperature raw meal thick mash. Background technique [0002] As one of the most important products of renewable energy to solve the energy crisis, how to further improve its production technology, reduce its production cost, and reduce environmental pollution has always been a hot spot and focus of the world's energy industry. Many countries in the world have begun to use biomass resources for industrial production of fuel ethanol. In 2008, Brazil, the largest producer of fuel ethanol, produced 30 billion liters of fuel ethanol; the consumption of fuel ethanol in the European Union was 1.75 million tons; the United States produced 11 billion gallons. Will reach 23 million tons. [0003] Under the current technical conditions, the most important problems faced by ethanol production are the pollution of the ...

Claims

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Application Information

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IPC IPC(8): C12P7/06C12R1/865C12P19/14
CPCY02E50/17Y02E50/10
Inventor 严宗诚陈砺王红林包莹玲
Owner SOUTH CHINA UNIV OF TECH
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