New purpose of corn core

A corn cob and new-use technology, applied in the field of comprehensive utilization of agricultural waste, can solve the problems of not being used, and achieve the effect of reducing the cost of raw materials

Active Publication Date: 2008-06-11
ANHUI BBCA FERMENTATION TECH ENG RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The annual output of corn in my country reaches 123 million tons. According to the calculation of the grain cob ratio of 1:0.25, the corn cob is also produced about 30 million tons per year. It is a renewable resource with gre

Method used

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Examples

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Example Embodiment

[0017] In the following, the present invention will be further described in conjunction with the embodiments:

[0018] 1. Corncob pretreatment

[0019] Take 100Kg of corncob, after cleaning, add tap water to clean the dirt and dust on the surface of the corncob. Then drain the sewage, put it into a 1000L reactor, and then add 0.1% H 2 SO 4 The solution is 600Kg, heated to 80°C with stirring, stays for 1 hour, and releases dilute acid water. Or reverse the order of the above two processes.

[0020] Enamel kettle (produced by Zibo Industrial Enamel Factory) with anchor stirring, rotating speed 60rpm, jacket heating and cooling.

[0021] 2. Acidolysis of corn cob

[0022] Add 0.8% of H to the above kettle 2 SO 4 The solution is 400-600kg, heated to 120°C with stirring, kept for 2 hours, the acid hydrolysis is over, centrifugal filtration, washing, the filtrate is xylose liquid, defermentation to produce xylitol or other products. The filter residue is 162Kg of acid hydrolysis residue...

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PUM

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Abstract

The invention relates to a new use of corn core, in particular to the application of the corn core in the citric acid preparation with a fermentation method. The preparation method comprises acidolysis, enzymolysis, fermentation, separation, and post treatment. The acid hydrolysis, namely, the corn core is hydrolyzed in 0.5 to 1.2 percent of dilute sulfuric acid solution at the temperature of 90 to 140 DEG C for 1.0 to 3.5 hours, and is separated and cleaned to obtain acidolysis sludge, the enzymolysis, namely, enzyme hydrolysis is performed to the acidolysis sludge with cellulase and cellobiase, so as to convert the cellulose into glucose, the glucose is separated and cleaned, and then enzymolysis liquid containing glucose is fermented with known spergillus niger, so as to convert the glucose into citric acid, and finally a monohydrate citric acid crystal with the purity being more than or equal to 99.8 percent can be obtained through the post treatment. About 5 to 7 tons of corn core are consumed for producing 1 ton of citric acid at a time, and therefore the raw material cost of the citric acid is greatly reduced.

Description

1. Technical field [0001] The invention relates to a comprehensive utilization of agricultural waste, in particular to a new application for preparing citric acid by fermenting corn cobs. 2. Background technology [0002] Citric acid is also known as citric acid, its English name is citric acid, and its chemical name is 3-hydroxy-3-carboxyglutaric acid. Appearance Colorless translucent crystal, or white granule, or white crystalline powder. The crystalline form of citric acid is different due to different crystallization conditions. There is anhydrous citric acid C 6 h 8 o 7 , there is also citric acid 2C containing crystal water 6 h 8 o 7 ·H 2 O, C 6 h 8 o 7 ·H 2 O or C 6 h 8 o 7 2H 2 O. Commercial citric acid is mainly anhydrous citric acid and monohydrate citric acid. [0003] The traditional production method of citric acid in my country is to use starchy agricultural products as raw materials. The applicant once pioneered the method of preparing citric...

Claims

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Application Information

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IPC IPC(8): C12P7/48
Inventor 李荣杰薛培俭郑辉黄之文宋家林邓远德尚海涛穆晓玲
Owner ANHUI BBCA FERMENTATION TECH ENG RES
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