Method for using lignocellulose as raw material to co-produce ethyl alcohol and electric energy

A technology for lignocellulose and raw materials, applied in the field of co-production of ethanol and electric energy, can solve the problems of low conversion efficiency of biomass to electric energy, complicated process, poor contact, etc.

Active Publication Date: 2016-03-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among these fuel cell technologies that indirectly use lignocellulose to generate electricity, although MFC can be operated under mild conditions below 50°C, the discharge rate is slow and the power density is often lower than 0.5mW / cm2. When raw materials and phenolic compounds are used as fuels, the power density is lower than 0.05mW / cm2
When SOFC uses syngas as fuel, it can obtain a power density as high as 1500mW / cm2, but the operation of SOFC needs to be carried out at a high temperature of 600-900°C, and impurities such as sulfur in the syngas will cause catalyst deactivation and reduce battery life. efficiency
Although DSFC can directly use solid carbon materials as raw materials, and the power density can reach 900mW / cm2, the poor contact between fuel (solid carbon) and electrodes and catalysts and serious electrode corrosion are the main bottlenecks restricting the large-scale application of DSFC.
In addition, these indirect biomass fuel cells need to combine the external biomass conversion system with the fuel cell system, not only need to add additional equipment, the process is more complicated, but also the external chemical and biological conversion causes significant losses, resulting in low conversion efficiency of biomass to electricity

Method used

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  • Method for using lignocellulose as raw material to co-produce ethyl alcohol and electric energy
  • Method for using lignocellulose as raw material to co-produce ethyl alcohol and electric energy
  • Method for using lignocellulose as raw material to co-produce ethyl alcohol and electric energy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Optimization of lignocellulose pretreatment conditions with heteropolyacids.

[0039] The lignocellulosic raw material used is wheat straw, and its main component content is determined to be 35.1% dextran, 23.4% xylan and 21.1% lignin. Adopt phosphomolybdic acid to carry out pretreatment, carry out pretreatment under the solid-liquid ratio of 1:10 (w / v), analyze phosphomolybdic acid concentration C (mol / L), pretreatment temperature T ( ℃ ), time t(h) and phosphoric acid concentration C P (mol / L) on the composition of pretreated cellulose solids and the impact of simultaneous saccharification and fermentation on the production of ethanol, the results are shown in the table below. It can be seen that phosphomolybdic acid can pretreat wheat straw raw materials under the conditions of concentration of 0.1-0.4, temperature of 100-160° C., time of 0.5-2.0 hours and phosphoric acid concentration of 0-0.6 mol / L. The optimal conditions for pretreatment of wheat straw with phos...

Embodiment 2

[0044] Comparison of pretreatment of wood fiber with different heteropolyacids or their salts.

[0045] The lignocellulosic raw material used is the same as in Example 1, and the concentration of heteropoly acid or its salt is 0.3mol / L, the concentration of phosphoric acid is 0.2mol / L, the solid-liquid ratio (w / v) is 1:10, and the temperature is 140°C. After 0.5 hour, the results of pretreatment with different heteropolyacids or their salts are shown in the table below. It can be seen that different oxidation states of heteropolyacids or their salts can obtain better pretreatment effects on wood fibers, and the pretreatment effects of phosphomolybdic acid, phosphotungstic acid, phosphomolybdovanadic acid, and phosphotungstovanadic acid most.

[0046] Table 2 Comparison of different oxidation states of heteropolyacids or their salts pretreated wood fiber

[0047]

Embodiment 3

[0049] Performance comparison of different reduced heteropolyacids or their salts in the oxidative regeneration of liquid flow fuel cells.

[0050] The reduced heteropolyacid or its salt obtained after pretreatment of wheat straw at 140°C was used as the anode electron donor, and oxygen was used as the cathode electron acceptor. figure 2 discharge in a liquid flow fuel cell. The liquid flow fuel cell is composed of a graphite bipolar plate, a carbon cloth electrode, a Nafion 115 proton exchange membrane produced by DuPont, and a plexiglass splint. Among them, there are grooves inside the graphite bipolar plate, which are used as the anode or cathode liquid or gas flow path and reaction chamber, and the active electrode area of ​​the battery is 40cm 2 , load 5mg / cm on the cathode carbon cloth -1 Pt(60%)-C as catalyst. The discharge temperature is room temperature (25°C). The comparison of the maximum power density generated by the discharge of different reduced heteropolya...

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Abstract

The invention discloses a method for using lignocellulose as a raw material to co-produce ethyl alcohol and electric energy. According to the method, oxidation-state heteropolyacid or its salt is adopted to pretreat the lignocellulose, most of lignin and hemicellulose are oxidized so that the accessibility of the cellulose can be remarkably improved, further conversion from the lignocellulose to ethanol is facilitated, and the heteropolyacid or its salt is reduced. The reduced-state heteropolyacid or its salt performs discharge in a liquid flow type fuel cell, so that the reduced-state heteropolyacid or its salt is re-oxidized into regenerated oxidation-state heteropolyacid or its salt while electric energy is obtained, and the oxidation-state heteropolyacid or its salt is cyclically used for pretreatment of the lignocellulose. By means of the method, the pretreated lignocellulose and biomass are directly converted into electric energy for coupling, the pretreatment process is regarded as the 'charging' process, the oxidization and regeneration process of the reduced-state heteropolyacid or its salt is regarded as the 'discharging' process, and accordingly ethyl alcohol and electric energy co-production is achieved by utilizing the lignocellulose under the mild conditions.

Description

technical field [0001] The invention belongs to the field of biomass energy, in particular to a method for co-producing ethanol and electric energy by using lignocellulose as a raw material. Background technique [0002] Lignocellulose, such as crop stalks and forestry residues, is the most abundant organic substance in nature, and it is the main raw material for the production of second-generation fuel ethanol. The production of fuel ethanol from lignocellulose generally requires steps such as pretreatment, enzymatic saccharification, fermentation, and ethanol recovery and purification. Among them, pretreatment is a key step in the production of cellulosic ethanol, and its main purpose is to improve the enzymatic hydrolysis performance of cellulose so that cellulose can be effectively saccharified into glucose. A variety of pretreatment methods have been developed, such as dilute acid pretreatment, alkali treatment, oxidation pretreatment, organic solvent pretreatment, etc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/10H01M8/18
CPCC12P7/10H01M8/188Y02E50/10Y02E60/50
Inventor 赵雪冰刘德华
Owner TSINGHUA UNIV
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