Method for improving quality of bio-oil

A bio-oil and biomass technology, applied in the preparation of bio-fuel, liquid hydrocarbon mixture, waste fuel, etc., can solve the instability of bio-oil, increase the cost of bio-oil refining, and the ineffective utilization of furfural and its derivatives, etc. problems, to achieve the effect of improving the quality of bio-oil, easy separation, and reducing coking.

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, furfural and its derivatives have not been effectively utilized in this method.
Moreover, the high content of carboxylic acid in the bio-oil makes the bio-oil overall acidic, causing the instability of the bio-oil. Even if the carboxylic acid is removed by separation to improve the oil product, it also increases the refining cost of the bio-oil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 1 kg of sawdust, soak it with 1.5 kg of sulfuric acid solution with a concentration of 0.5 mol / L for 1 hour, and dry it at 120° C. for 4 hours to obtain the cracking raw material. The pyrolysis raw material is thermally cracked at 600° C. for 50 minutes to obtain bio-oil a. Take 100g of bio-oil a produced by cracking and add it into the autoclave. The pH of bio-oil a is 2.5, and the calorific value is 16.83 MJ / kg.

[0028]Add 40g of calcium oxide in the autoclave, and seal it with a lid. Replace the air in the autoclave with nitrogen for 6 times, and fill the autoclave with 1.0 MPa nitrogen. Put the autoclave in an oil bath, at 70°C, fully stir and react for 3 hours; continue to heat up to 170°C, fully stir and react for 1.5 hours; cool down to 110°C, continue to keep warm, fully stir and react for 1.5 hours. After the reaction is finished, the catalyst is recovered by filtration to obtain upgraded bio-oil b. The compositions of bio-oil a and upgraded bio-oil b ...

Embodiment 2

[0030] Get the bio-oil a of 100g embodiment 1 and join in the autoclave, and add 45g calcium oxide, add a cover and seal. Replace the air in the autoclave with nitrogen for 6 times, and fill the autoclave with 1.0 MPa nitrogen. Put the autoclave in an oil bath, fully stir and react at 60°C for 4 hours; continue to heat up to 180°C, stir and react for 1 hour; cool down to 90°C, continue to keep warm and stir for 1 hour. After the reaction is finished, the catalyst is recovered by filtration to obtain the upgraded bio-oil c. After GC-MS analysis, the c composition of the upgraded bio-oil is shown in Table 1. As can be seen from Table 1, after the treatment of the present invention, organic carboxylic acids and aldehydes and ketones are greatly reduced, and are all converted into furfuryl acetones and other condensation products. The addition of calcium oxide increases, and the amount of condensation products also increases. The pH of the upgraded bio-oil was 5.7, the heat valu...

Embodiment 3

[0039] Take 1 kg of sawdust, soak it in 2 kg of 0.5 mol / L sulfuric acid solution for 2 hours, and dry it at 100° C. for 6 hours to obtain cracking raw materials. The cracked raw material was cracked at 600° C. for 30 minutes to obtain bio-oil f. Take 100g of bio-oil f produced by pyrolysis and add it into the autoclave. The pH of bio-oil f is 2.7, and the calorific value is 17.26 MJ / kg. The composition is shown in Table 2.

[0040] Add 45g of calcium oxide in the autoclave, cover and seal. Replace the air in the autoclave with nitrogen for 6 times, and fill the autoclave with 1.0 MPa nitrogen. Put the autoclave in an oil bath, stir and react at 80°C for 2 hours; continue to heat up to 160°C, stir and react for 2 hours; cool down to 120°C, continue to keep warm and stir for 2 hours. After the reaction is finished, the catalyst is recovered by filtration to obtain the upgraded bio-oil g. After GC-MS analysis, the g composition of the upgraded bio-oil is shown in Table 2. It ...

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Abstract

The invention relates to a method for improving the quality of bio-oil. The method comprises the following steps: adding bio-oil produced by the pyrolysis into an autoclave, adding calcium oxide and reacting for 1-4 hours at 30-80 DEG C under nitrogen atmosphere, heating to 160-180 DEG C, reacting for 0.5-2 hours, and finally cooling to 80-120 DEG C, and further carrying out heat preservation and reacting for 0.5-2 hours to obtain precursors of C7-C15 alkane fuels. By the method, the content of acid in the bio-oil can be well decreased, the pH and stability of the bio-oil are increased and meanwhile, produced ketone substances and aldehyde substances in the bio-oil can be reacted to obtain the precursors of the C7-C15 alkane fuels and thus the quality of the bio-oil is improved.

Description

technical field [0001] The invention belongs to the field of biomass energy, and in particular relates to a method for improving the quality of bio-oil. Background technique [0002] With the gradual depletion of global petroleum fossil resources, the development and utilization of biomass energy has attracted much attention. Bio-oil has the characteristics of wide source of raw materials, renewable, convenient transportation, high energy density, etc., and is a potential liquid fuel and chemical raw material. Biomass pyrolysis to produce bio-oil technology has developed rapidly since its advent in the 1980s. Internationally, technical means such as biomass thermal cracking and biomass microwave cracking have been developed to prepare bio-oil. Biodiesel from biomass is a general direction for the development of bio-oil. Although biodiesel has the characteristics of good lubricating performance, good safety and stability, high cetane number, and good environmental protectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G2/00C10B53/02C10B57/08
CPCC10B53/02C10B57/08C10G3/44Y02E50/10Y02E50/30Y02T50/678
Inventor 李政王鑫张全白富栋乔凯王领民
Owner CHINA PETROLEUM & CHEM CORP
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