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A kind of pretreatment method of corn stalk
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A corn stalk and pretreatment technology, applied in the field of cellulosic ethanol, can solve problems such as harsh conditions and environmental pollution by alkaline reagents, and achieve the effects of low equipment requirements, saving usage, and improving enzymatic hydrolysis efficiency.
Active Publication Date: 2019-01-22
TIANJIN UNIV
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Problems solved by technology
However, although sodiumhydroxide or quicklime can be used under normal pressure, a large amount of water is required to wash after pretreatment to remove alkaline reagents, and the discharge of alkaline reagents will pollute the environment; and pretreatment with ammonia or liquid ammonia High-voltage equipment is required when the conditions are harsh
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Effect test
Embodiment 1
[0028] Weigh and shred dry matter content and be that 5g corn stalks with water content of 5% are spread flat on the tray, the thickness is 0.5cm, put into the reactor, add 25ml ethylenediamine at the bottom of the reactor, close the reactor, Raise the temperature of the reactor to 150°C, react for 3 hours, cool the reactor to 110°C, wait for the ethylenediamine gas in the reactor to condense completely, open the upper cover of the reactor, raise the temperature to 180°C again to dry the solid, and obtain pretreated corn straw.
[0029] After saccharification analysis of the pretreated corn stalks, the glucose yield was 90%.
Embodiment 2
[0031] Weigh and shred dry matter content and be that 5g of corn stalks with moisture content of 60% are spread flat on the pallet, the thickness is 2cm, put into the reactor, add 50ml ethylenediamine at the bottom of the reactor, close the reactor, raise Reactor temperature to 200°C, react for 5 hours, cool the reactor to 90°C, wait for the ethylenediamine gas in the reactor to condense completely, open the upper cover of the reactor, raise the temperature to 120°C again to dry the solid, and obtain pretreated corn stalks .
[0032] After saccharification analysis of the pretreated corn stalks, the glucose yield was 79%.
Embodiment 3
[0034] The dry matter content of taking and shredding is 5g and the corn stalk of 40% water content is spread flat on the pallet, and thickness is 5cm, puts into reactor, adds 0.5ml ethylenediamine at the bottom of reactor, airtight reactor, liter Raise the reactor temperature to 120°C, react for 0.5h, cool the reactor to 50°C, wait for the ethylenediamine gas in the reactor to condense completely, open the upper cover of the reactor, raise the temperature to 70°C again to dry the solid, and obtain the pretreated Corn stalks.
[0035] The saccharification analysis of the pretreated corn stalks showed that the glucose yield was 40%.
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Abstract
The invention provides a pretreatment method for maize straws. The pretreatment method comprises the following steps of placing the maize straws and ethylenediamine into a closed reactor, and heating to the temperature of 120-200 DEG C to react to obtain pretreated maize straws. According to the pretreatment method, ethylenediamine can be sufficiently and uniformly mixed with materials, so that the usage amount of ethylenediamine can be reduced; ethylenediamine has relatively strong alkalinity, so that ether bonds between lignin and hemicellulose can be opened, lignin can be degraded, cellulose and hemicellulose are retained to the maximum extent, and the enzymolysis efficiency of the pretreated maize straws is increased. The pretreatment method is simple in operation, free of high-pressure equipment, low in equipment requirement and energy consumption and suitable for industrial production.
Description
technical field [0001] The invention belongs to the technical field of celluloseethanol, and in particular relates to a method for pretreatment of corn stalks. Background technique [0002] Liquid fuels are convenient for transportation and utilization, and have become important industrial and daily energy sources. Among them, petroleum is currently the most used liquid fuel in the world, however, petroleum resources are non-renewable and CO 2 And other polluting gas emissions will lead to environmental degradation. The development of renewable clean energy has become the top priority of my country's energy development strategy. As an alternative clean liquid energy source, ethanol has received widespread attention and attention. The traditional method of producing ethanol is to use grain as raw material and use yeast to directly ferment ethanol to produce ethanol. land and compete with others for food". People gradually turn their attention to agricultural wastes, such...
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Application Information
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