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Improved method of excess calcium hydrate detoxification during cellulose ethanol production

A technology of cellulosic ethanol and calcium hydroxide, applied in the direction of microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve the problems of large amount of calcium hydroxide and low conversion rate of cellulosic ethanol, and achieve low price, Simple equipment, good fermentation effect

Inactive Publication Date: 2010-04-14
HARBIN INST OF TECH
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of large amount of calcium hydroxide and low conversion rate of cellulose ethanol in the existing calcium hydroxide excessive detoxification method, and provide an improved method for excessive calcium hydroxide detoxification in the production of cellulose ethanol

Method used

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  • Improved method of excess calcium hydrate detoxification during cellulose ethanol production
  • Improved method of excess calcium hydrate detoxification during cellulose ethanol production
  • Improved method of excess calcium hydrate detoxification during cellulose ethanol production

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specific Embodiment approach 1

[0011] Specific Embodiment 1: In this embodiment, the method for improving the detoxification of excessive calcium hydroxide in the production of cellulose ethanol is carried out according to the following steps: 1. Cut the mature corn stalks into sections, and then heat the corn stalks at a temperature of 220-240°C and a pressure of 1.6-1.8 Steam explosion pretreatment under the condition of MPa for 4-6 minutes to obtain steam-exploded straw; 2. Put the steam-exploded straw into distilled water and mix, then stir for 20-30 minutes at a stirring speed of 150-300r / min, filter, Obtain filtrate A and filter residue; 3. Use calcium hydroxide to adjust the pH of filtrate A to 10-11, then heat-preserve it in a water bath at 65°C for 20-30 minutes, then cool to room temperature and filter to obtain filtrate B; 4. Put the filtrate B into the filter residue in step 1 and adjust the pH to 4.8-5.5, then sterilize with moist heat for 20 minutes at a temperature of 121°C, then add cellulase...

specific Embodiment approach 2

[0021] Embodiment 2: This embodiment is different from Embodiment 1 in that the mature corn stalks in step 1 are cut into 4-6 cm segments. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0022] Embodiment 3: This embodiment is different from Embodiment 1 in that the mature corn stalks in step 1 are cut into 5 cm segments. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

A method for improving the detoxification of excess calcium hydrate during cellulose ethanol production relates to the method for improving the detoxification of the excess calcium hydrate. The invention solves the problems of big dosage of calcium hydroxide and low converting rate of cellulose ethanol of existing detoxification methods of the excess calcium hydrate, the method comprises the following steps: firstly, preparing a steam explosion straw, secondly, preparing filtrate A and a filter residue, thirdly, preparing filtrate B, fourthly, placing the filtrate B into the residue and adjusting the PH, then carrying out the damp-heat disinfection, adding cellulose and saccharomyces cerevisiae, then carrying out the saccharifying and fermentation, namely completing the improvement of the detoxification of the excess calcium hydrate during cellulose ethanol production. The invention not only reduces the dosage of the calcium hydrate, and the dosage is only 50%-60% of that of the prior art, but also improves the conversion rate of the cellulose ethanol to 84%-95% from the original 75%-79%, and can be widely applied in the production technologies. The method of the invention has the advantages that the required equipment is simple, and the cost of raw materials is low.

Description

technical field [0001] The invention relates to an improved method for detoxifying excessive calcium hydroxide. Background technique [0002] In the production of cellulosic ethanol, based on the special structure of natural cellulose, it is a necessary technical means to perform appropriate pretreatment to open the molecular structure of lignocellulose before enzymatic hydrolysis of cellulose. Steam explosion pretreatment is currently the most widely used cellulose pretreatment method. However, the formic acid, acetic acid, furan substances (such as furfural and carboxymethylfurfural) and various phenolic compounds produced in the pretreatment process of corn stalks treated by this method have a strong inhibitory effect on ethanol fermentation. Therefore, it is necessary to remove these poisons in advance or reduce their toxic effects. [0003] At present, the method of excessive calcium hydroxide is the most widely used and most effective detoxification method. Excessive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/10C12R1/865
CPCY02E50/16Y02E50/10
Inventor 冯玉杰于艳玲李贺于丽新
Owner HARBIN INST OF TECH
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