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Method for preparing bio-oil by liquefying biomass by high efficiency hydro-thermal method

A hydrothermal liquefaction and biomass technology, applied in the preparation of liquid hydrocarbon mixtures, petroleum industry, etc., can solve the problems of gasification, low reduction efficiency of reducing gas, low product yield, etc., and achieve coking, equipment and operation inhibition. The effect of high cost and high oil yield

Inactive Publication Date: 2013-08-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the resistance of gas-liquid mass transfer in hydrothermal liquefaction, the reduction efficiency of reducing gas is low, the problems of coking and gasification are serious, and the product yield is low

Method used

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  • Method for preparing bio-oil by liquefying biomass by high efficiency hydro-thermal method
  • Method for preparing bio-oil by liquefying biomass by high efficiency hydro-thermal method
  • Method for preparing bio-oil by liquefying biomass by high efficiency hydro-thermal method

Examples

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Effect test

Embodiment 1

[0027] see figure 1 , In this example, sawdust (passed through a 20-mesh screen) with a moisture content (mass percentage) of 21.2% is used as biomass, and the elemental analysis of the material is shown in Table-1. A 2L high-pressure reactor is used as a liquefaction reactor, and tetralin is used as a hydrogen-donating solvent. The aromatic carbon rate is 0.6, and the boiling point is 207.6°C. Sodium hydroxide is used as a catalyst, and no reducing gas is introduced. Gas N 2 Provide initial pressure to prepare bio-oil, the specific steps are as follows:

[0028] Weigh 126.9g of wood chips, add 123.1g of water to form 250g of biomass slurry with a water content of 60%, and then mix with 10g of hydrogen-donating solvent (10% of the dry mass of biomass) and 1g of catalyst sodium hydroxide (that is, biomass 1% of the mass on a dry basis), poured into a 2L high-pressure reactor together, and introduced an inert gas N 2 (Non-reducing gas) to an initial pressure of 5MPa, the reac...

Embodiment 2

[0032] see figure 1 In this example, wood chips (passing through a 20-mesh screen) with a moisture content (mass percentage) of 21.2% are used as biomass. The elemental analysis of the material is shown in Table-1, and a 2L high-pressure reactor is used for the liquefaction reaction. device, and tetrahydronaphthalene is used as a hydrogen-donating solvent, its aromatic carbon rate is 0.6, and its boiling point is 207.6°C. No catalyst is added, and H 2 As a reducing gas and providing initial pressure to prepare bio-oil, the specific steps are as follows:

[0033] Weigh 126.9g of sawdust, add 39.8g of water to form 166.7g of biomass slurry with a water content of 40%, and then pour it into a 2L high-pressure reactor together with 80g of hydrogen-donating solvent (that is, 80% of the dry mass of biomass), Introduce reducing gas H 2 To the initial pressure of 5MPa, the reactor stirrer maintained a rotation speed of 1000r / min, and the high-pressure reactor was heated to 250°C at ...

Embodiment 3

[0036] see figure 1 In this embodiment, fresh pig manure with a water content (mass percentage) of 72.8% is used as biomass. The elemental analysis of the material is shown in Table-1. A 2L high-pressure reactor is used as a liquefaction reactor, and the distillation range is The coal hydrogenation liquefaction circulating solvent at 180-400°C is the hydrogen-donating solvent, and the aromatic carbon ratios before and after hydrogenation are 0.41 and 0.30 respectively. Sodium carbonate is used as the catalyst, and non-reducing gas N is used instead of reducing gas. 2 Provide initial pressure to prepare bio-oil, the specific steps are as follows:

[0037] Weigh 183.8g of fresh pig manure, add 316.2g of water to form 500g of biomass slurry with a moisture content of 90%, and then mix it with 15g of hydrogen-donating solvent (ie, 30% of the dry mass of biomass) and 4g of catalyst sodium carbonate (ie, 8% of the mass of the substance on a dry basis), poured into a 2L high-pressur...

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Abstract

The invention discloses a method for preparing bio-oil by liquefying biomass by a high efficiency hydro-thermal method, comprising the following steps of: (a) sending a biomass slurry with 40-90% of water content and a hydrogen-donor solvent into a liquefaction reactor, and reacting for 1-180min at 250-450 DEG C and under total pressure intensity of 5-30MPa, to generate a liquid-solid mixed slurry and gases; and (b) separating an oil phase from the liquid-solid mixed slurry, to obtain the bio-oil contain a hydrogen-poor solvent. The method introduces the hydrogen-donor solvent into a traditional 'CO / H2O / alkali metal catalyst' line, to obtain a new 'hydrogen-donor solvent / H2O' line, is especially suitable for biomass with high water content, and can still obtain a high oil-production rate under a condition without a catalyst and / or a reducing gas.

Description

technical field [0001] The invention relates to a method for preparing bio-oil by hydrothermal liquefaction of biomass, which belongs to the field of new energy technology. The bio-oil produced can be further processed to prepare high-grade liquid alternative fuel or chemical raw material, and can also be directly used as boiler fuel, and the generated gas and solid by-products can be collected and utilized. Background technique [0002] Biomass thermochemical conversion technologies mainly include: gasification, pyrolysis and liquefaction technologies. The former is aimed at gaseous fuels, and the latter two are aimed at liquid fuels. [0003] Pyrolysis technology rapidly heats biomass fine particles to 450-550°C under normal pressure to generate small molecule gas, condensable gas, aerosol and solid coke. Under the high-speed airflow, the gas products whose temperature is controlled at 400-500°C are quickly discharged (material residence time <2S), and rapidly cooled ...

Claims

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Application Information

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IPC IPC(8): C10G1/00
Inventor 张志剑李鸿毅
Owner ZHEJIANG UNIV
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