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Process for separating bio-oil via solvent with high boiling point

A high-boiling solvent, bio-oil technology, applied in lignin derivatives, chemical instruments and methods, petroleum industry, etc., can solve problems such as pollution of the environment, avoid pollution, reduce economic costs, and improve environmental friendliness and safety. Effect

Inactive Publication Date: 2011-08-24
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of environmental pollution in the existing separation methods of different components of bio-oil, and at the same time, provide high-grade intermediate raw materials and high value-added chemicals for bio-oil refining and processing, the present invention provides a method for separating bio-oil with a high boiling point solvent

Method used

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  • Process for separating bio-oil via solvent with high boiling point
  • Process for separating bio-oil via solvent with high boiling point
  • Process for separating bio-oil via solvent with high boiling point

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Take 60g of glycerin, heat it to 230°C under stirring, control the temperature between 230-250°C, add 30g of bio-oil drop by drop through the constant pressure dropping funnel, and drop it for about 30 minutes, collect the fraction until no liquid flows out. A mixture of 18.55 g of fractions and residual glycerin was obtained, the water content of the fraction was 51.5wt.%, and the content of glycerin was 16.21wt.%, that is, a fraction of 51.80wt.% was obtained from bio-oil. The obtained fraction is analyzed by GC-MS, and the GC-MS spectrogram is shown in figure 2 ; Fractions containing aldehydes, ketones, acids, esters and aromatic compounds.

[0018] Cool the remaining glycerol mixture to 80°C, add it dropwise to 40ml deionized water, and keep stirring, a large amount of brown precipitates are precipitated, and centrifuged to obtain the precipitates and glycerin filtrate; the precipitates are washed twice with 15ml deionized water, centrifuged Separation and vacuum ...

Embodiment 2

[0021] Considering that the fractions in Example 1 contain a relatively high concentration of glycerin, in order to avoid glycerol from entering the fractions, the distillation temperature was controlled between 200-220° C., and the method of suction filtration was used instead of centrifugation to increase the recovery rate of glycerin. Other operations of the separation process were the same as in Example 1 to obtain 47.11wt.% fraction and 29.77wt.% lignin, wherein the fraction had a moisture content of 55.02wt.% and a glycerin content of 1.21wt.%. It can be seen that lowering the temperature to between 200-220°C can effectively reduce the glycerol content in the fraction.

[0022] At the same time, 58.10 g of crude glycerol was recovered, and the glycerol content was 81.32wt.%, that is, the recovery rate of pure glycerin was 78.74wt.%. Part of the glycerin was transferred to the washing liquid, and after being enriched to a certain concentration, it could be recovered by dis...

Embodiment 3

[0024] Using 58.10 g of crude glycerin recovered in Example 2 as a solvent, 30 g of bio-oil was separated, and the separation process was the same as that of Example 2 to obtain 52.05 wt.% fraction and 34.92 wt.% lignin. 53.85 g of crude glycerin was recovered, and the recovery rate of crude glycerin was 92.69 wt.%. This example demonstrates that the recovered crude glycerol can be recycled, and the fraction and lignin yields are slightly higher than pure glycerol. This is caused by the solubility of glycerol to some components in bio-oil, and the recycling of glycerol can eliminate this effect and improve the product yield.

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Abstract

The invention relates to a method for separating bio-oil through high boiling point solvent, solving the problem that the prior method for separating different components of bio-oil pollutes the environment. The method comprises the following steps that: glycerin is used as a solvent and a heat transfer medium; in the temperature range between 200 and 250 DEG C, bio-oil is distilled under atmospheric pressure so as to obtain fractions; residual glycerin mixture is mixed with water to separate out lignin precipitates; the glycerin mixture mixed with water is heated to 230 DEG C to recover crude glycerin and water to be recycled. The method can integrate bio-oil separation with the prior petrochemical process, so as to obtain organic components and cracking lignin with different boiling points, completely avoids the use of inorganic acid, alkali and volatile organic solvent, avoids pollution, improve the environmental friendly property and safety of separation process. The method is simple in technological operation and easy to realize. As the glycerin and water are recycled and the needed heat energy is provided by the bio-oil, the economic cost of the separation process is reduced.

Description

technical field [0001] The invention relates to a separation method of biological oil, in particular to a distillation method of biological oil. Background technique [0002] Today's society mainly relies on traditional fossil energy, and 74% of the world's total energy consumption comes from fossil energy such as coal, oil, and natural gas. The application of fossil energy has promoted the development of society, but resources are increasingly depleted. Biomass, as the only renewable energy that can be directly converted into gas, liquid, and solid fuels, has attracted widespread attention from all over the world. Among them, biomass rapid pyrolysis liquefaction technology has developed rapidly since the 1980s, and has become a new research hotspot in the field of biomass liquid fuels. Biomass rapid pyrolysis can obtain more than 70% of the liquid product-bio-oil, which has great potential to replace petroleum products, and the content of bio-oil is low in nitrogen and su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G21/16C07G1/00C08H7/00
Inventor 邓理傅尧郭庆祥
Owner UNIV OF SCI & TECH OF CHINA
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