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Subcritical or supercritical water electrochemically enhanced liquid-phase catalyzed biomass cracking method

A technology of supercritical water and biomass, which is applied in the preparation of liquid hydrocarbon mixtures, the petroleum industry, and the treatment of hydrocarbon oils. The effect of low consumption and high yield

Active Publication Date: 2017-05-10
坤育环境发展(云南)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent 200910098433.4 "Method for preparing fuel oil by liquefaction of biomass using supercritical methanol as a medium" describes a method for decomposing solid biomass into low-molecular-weight fuel oil using supercritical methanol as a medium, although it eventually produces a part of oil products, such as Alcohols, ethers and esters equivalent to gasoline components, but without hydrogenation in the patent, the oil has high oxygen content and low calorific value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: take subcritical water as medium, with K 2 CO 3 Poplar liquefied bio-oil as catalyst

[0021] (1) Mix 1 kg of dried poplar wood powder with a particle size of 20 mesh, 0.5 kg of catalyst, and 5 L of water in a mixer, stir evenly, and then add the raw material slurry into the high-pressure reactor;

[0022] (2) Select the mesh carbon fiber electrode as the anode, and the rod-shaped platinum electrode as the cathode. Heat up the temperature to 340°C with a pressure of 17.5MPa, and apply a DC voltage of 0.5V to the cathode. When biomass pyrolysis starts to produce gas, it will automatically discharge The pressure was kept constant for 0.4 hours in this state. The volatile matter generated by the reaction was condensed and dried to obtain bio-oil. The main components of bio-oil were acetic acid and furfural. The biomass conversion rate was 86wt%, the oil production rate was 70wt%, and the oxygen content in bio-oil was 8wt%.

[0023] (3) Select the mesh carb...

Embodiment 2

[0025] Example 2: Liquefied bio-oil from Phyllostachys pubescens with supercritical water as medium and NaOH as catalyst.

[0026](1) Mix 1.8 kg of dried bamboo powder with a particle size of 40 mesh, 0.108 kg of catalyst, and 8 L of water in a mixer, stir evenly, and then add the raw material slurry into the high-pressure reactor;

[0027] (2) Select the plate-shaped graphite electrode as the anode, and the plate-shaped aluminum electrode as the cathode; seal the temperature to 400°C, the pressure is 25.1MPa, and apply 1.5V AC voltage to the cathode and anode, and the biomass pyrolysis begins to produce gas. When the pressure is high, the pressure is automatically exhausted and the constant pressure is kept at this state for 1.0 hours. The volatile matter generated by the reaction is condensed and dried to obtain bio-oil. The main components of bio-oil are 2,3-dihydrobenzofuran, methoxy, ethyl , vinyl and allyl and other H-type phenols and a small amount of acetic acid, the b...

Embodiment 3

[0030] Example 3: Tobacco leaf liquefaction bio-oil with subcritical water as medium and CoMo / γ-silicon dioxide as catalyst

[0031] (1) Mix 2.5kg of dried tobacco leaf powder with a particle size of 60 mesh, 0.15kg of catalyst, and 17L of water in a mixer, stir evenly, and then add the raw material slurry into the high-pressure reactor;

[0032] (2) Select the mesh platinum electrode as the anode and the plate graphite electrode as the cathode, heat up to 350°C with a pressure of 23.4MPa after sealing, apply an AC voltage of 5V to the anode, and automatically discharge when the biomass pyrolysis starts to produce gas and overpressure Keep the gas under constant pressure for 0.5 hours; the volatile matter generated by the reaction is condensed and dried to obtain bio-oil. The main components of bio-oil are ketones such as 2-cyclopentene-1,4-dione, furfural, 5 -Hydroxymethylfurfural, 5-methylfurfural and furfuryl alcohol have a biomass conversion rate of 85wt%, an oil yield of ...

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Abstract

The invention discloses a subcritical or supercritical water electrochemistry reinforced liquid phase catalytic biomass pyrolysis method. The method takes subcritical or supercritical water as a medium to process the biomass in presence of a catalyst, by electrolyzing water to produce hydrogen, the biomass is pyrolyzed and dissolved, and the solid biomass is decomposed and converted to low molecular weight biological oil; on one hand, the subcritical or supercritical water transfers heat to the biomass, on the other hand, free hydrogen is released under an electrolysis function, free radical chain reaction is timely blocked, yield of liquid fuel is effectively increased and quality is improved; the biomass is uniformly heated, a chemical bond of lignocellulose is ruptured, an ion pair intermediate is generated and is stimulated by an electric field, a pyrolysis rate is quickened, efficiency is high, a process is easy to control and a use rate of the biomass is improved.

Description

technical field [0001] The invention relates to the technical field of renewable energy, in particular to a method for producing bio-oil from biomass by electrolyzing water to produce hydrogen by using subcritical or supercritical water as a medium. Background technique [0002] The production of liquid fuels from biomass currently mainly adopts pyrolysis methods, which are generally divided into high-pressure liquefaction, rapid pyrolysis and conventional pyrolysis. The high-pressure liquefaction pressure is generally about 20MPa, the temperature is 250-400°C, and the material residence time is 15min-2h. 2 Fuel oil with good quality and high calorific value can be obtained by pyrolysis under the action of a catalyst: fast pyrolysis at normal pressure, heating rate 1000-10000°C / s, reaction temperature about 500°C, material residence time 0.5-1s, liquid yield Higher, but the calorific value of its products is lower; the conventional cracking temperature is less than 500°C, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G1/00
CPCC10G1/00C10G2300/1011
Inventor 瞿广飞赵茜李军燕宁平谷俊杰
Owner 坤育环境发展(云南)有限公司
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