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Method for separating phenols from bio-oil

A technology for bio-oil and phenols, which is applied in the separation/purification of carbonyl compounds, ether separation/purification, chemical instruments and methods, etc. The effect of improving economic value and expanding use

Inactive Publication Date: 2013-03-20
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, there are few studies on the separation of phenols from bio-oil, and there are not many published patent reports.

Method used

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  • Method for separating phenols from bio-oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The bio-oil was subjected to atmospheric distillation at 160°C to obtain distillation fractions. The main phenolic substances and contents in the bio-oil and fractions are shown in Table 1. Take 5 mL of bio-oil distillation fraction and add 2.5 mol / L sodium hydroxide solution to alkalinize to pH 10.5. Take 2 mL of alkalized solution and extract 3 times with 2 mL of ethyl acetate, mix and shake and let stand for 1 h to form a distinct organic phase and aqueous phase. Take 2 mL of the aqueous phase solution and add 2.5 mol / L hydrochloric acid solution to acidify to pH about 6.0, and add 2 mL of 2.5 mol / L sodium chloride solution. Then extracted three times with 2 mL of ethyl acetate, mixed and oscillated, and after standing for 1 h, the organic phase containing phenols was collected, and the purity of phenols was measured to be 73.2 wt%.

[0020] Table 1

[0021]

Embodiment 2

[0023] Similar to Example 1, 5 mL of bio-oil distillation fraction was added into 2.5 mol / L sodium hydroxide solution for alkalinization to pH 12.0. Take 2 mL of alkalized solution and extract 3 times with 2 mL of ethyl acetate, mix and shake and let stand for 1 h to form a distinct organic phase and aqueous phase. Take 2 mL of the aqueous phase solution and add 2.5 mol / L hydrochloric acid solution to acidify to pH about 6.0, and add 2 mL of 2.5 mol / L sodium chloride solution. Then extracted three times with 2 mL of ethyl acetate, mixed and oscillated, and after standing for 1 h, the organic phase containing phenols was collected, and the purity of phenols was measured to be 74.7 wt%.

Embodiment 3

[0025]Similar to Example 1, 5 mL of bio-oil distillation fraction was added to 2.5 mol / L sodium hydroxide solution for alkalinization to pH 11.5. Take 2 mL of alkalized solution and extract 3 times with 2 mL of ethyl acetate, mix and shake and let stand for 1 h to form a distinct organic phase and aqueous phase. Take 2 mL of the aqueous phase solution and add 2.5 mol / L hydrochloric acid solution to acidify to pH about 6.0, and add 2 mL of 2.5 mol / L sodium chloride solution. Then extracted three times with 2 mL of butyl acetate, mixed and oscillated, and after standing for 1 h, the organic phase containing phenols was collected, and the purity of phenols was measured to be 78.1 wt%.

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Abstract

The invention provides a method for separating phenols from bio-oil, which relates to a method for separating phenols from oil obtained through pyrolysis of biomass. The method comprises the following steps: distilling bio-oil, intercepting fractions obtained at a temperature below 160 DEG C and adding aqueous alkali for alkalization until the pH value of the fractions is greater than 10; and extracting an alkalized solution with an extractant, acidifying a water phase left after extraction with an acid, then adding a saline solution, carrying out extraction again by using a back-extractant and removing an organic phase through reduced pressure distillation so as to obtain a mixture of phenols. The method provided by the invention both broadens usage and improves the economic value of the bio-oil and opens up a wide prospect for separation and utilization of the bio-oil.

Description

technical field [0001] The invention relates to a method for separating phenols from biomass pyrolysis oil. Background technique [0002] The environmental problems caused by the use of fossil energy and the energy crisis caused by the depletion of traditional energy sources have received more and more attention. Therefore, it is very necessary to develop alternative energy sources. At present, among all kinds of renewable energy, biomass is the only environmentally friendly energy that can be converted into liquid fuel. Its conversion and utilization can not only realize CO 2 It can also use agricultural and forestry waste, domestic waste, etc. to produce gas, liquid, and solid materials that can be used as energy, so as to achieve the purpose of turning waste into treasure and comprehensive utilization. In particular, chemicals with higher added value can be further separated and extracted from the liquid obtained from biomass conversion. Therefore, the development and u...

Claims

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Application Information

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IPC IPC(8): C07C43/23C07C41/44C07C39/04C07C39/06C07C39/07C07C37/86C07C47/58C07C45/85
Inventor 吕东灿刘运权王夺
Owner XIAMEN UNIV
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