A kind of method for separating levo-glucan from wood vinegar

A technology of levoglucosan and wood vinegar, which is applied in the field of separation of levoglucosan components in wood vinegar, can solve problems such as separation influence, separation difficulty, and removal of impurities, and achieve good industrial application prospects, technology The effect of simple process

Active Publication Date: 2022-04-29
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the method that can effectively extract the levoglucosan in the wood vinegar has not yet been reported
The difficulty in separating levoglucosan with wood vinegar is that the components in wood vinegar are extremely complex. In addition to the aforementioned acids, aldols, and phenols, it also contains some carbon black particles, mixed with Wood tar and other components make pre-treatment more difficult
Therefore, it is very difficult to specifically separate a certain compound from wood vinegar, especially the pretreatment process cannot remove a large number of impurities, which will have a huge impact on subsequent separations

Method used

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  • A kind of method for separating levo-glucan from wood vinegar
  • A kind of method for separating levo-glucan from wood vinegar
  • A kind of method for separating levo-glucan from wood vinegar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Using different bases to adjust alkalinity

[0026] The wood vinegar obtained by pyrolysis of wood is black, with a pH of 3-4, and is completely opaque. In addition to levoglucosan, other soluble parts mainly contain phenol, hydroquinone, hydroxyacetone, acetic acid and furfural One or more of them, wherein the content of levoglucosan is about 2%. The specific ingredients are shown in Table 1:

[0027] Table 1 Composition list in wood vinegar

[0028]

[0029] In addition to soluble components, wood vinegar also contains some tiny carbon black particles that can be suspended in the solution, mixed wood tar and other components. These components exist in the form of colloids, which affect the subsequent levoglucosan. Extraction needs to be removed by pretreatment.

[0030] Take 3 parts of 100mL wood vinegar stock solution, add sodium hydroxide, magnesium oxide, sodium carbonate and triethylamine to it respectively at room temperature, let it stand for 1 ...

Embodiment 2

[0034] Embodiment 2: use calcium hydroxide to adjust different pH

[0035] The damage to the colloidal ionosphere is different with different amounts of alkali. Take 5 parts of 100mL wood vinegar stock solution, add alkaline substance calcium hydroxide to it at room temperature, the amount is 3.0g, 3.4g, 3.8g, 4.2g, 4.6g, after standing for 1h, centrifuge at 10000rpm for 10min, and measure the precipitation The results are shown in Table 3.

[0036] Table 3 The amount of precipitation after adjusting different pH

[0037] Dosage pH Sedimentation 3.0g 6.6 4.824g 3.4g 8.2 4.976g 3.8g 9.3 5.175g 4.2g 10.0 5.333g 4.6g 10.5 5.709g

[0038]It can be seen from Table 3 that as the pH continues to increase, the ionosphere damage to the colloid is more obvious, and more precipitation is produced. But when the pH is above 10, some colloids are resuspended in the solution, causing the wood vinegar to become too viscous, which is not condu...

Embodiment 3

[0039] Example 3: Flocculation by adding different flocculants

[0040] Although the addition of alkaline substances can destroy the colloidal ionization layer, so that it can be precipitated and removed, there are still a small amount of colloidal substances that need to be enhanced by adding flocculants to form larger particles to facilitate separation. Take 3 parts of 100mL stock solution of wood vinegar, add polyaluminum chloride, cetyltrimethylammonium bromide and sodium dodecylbenzenesulfonate to it at room temperature, let stand for 1h, centrifuge at 10000rpm for 10min, The amount of precipitation was measured, and the results are shown in Table 4.

[0041] Table 4 The amount of sediment after flocculation with different flocculants

[0042] flocculant Dosage Sedimentation PAC 0.6g 0.795g cetyltrimethylammonium bromide 0.6g 0.726g Sodium dodecyl benzene sulfonate 0.6g 0.769g

[0043] It can be seen from Table 4 that after adding ...

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Abstract

The invention discloses a method for separating levoglucosan from wood vinegar. The method uses wood vinegar as a raw material. The separation process includes: adding an alkaline compound to adjust the wood vinegar to alkaline, and adding flocculation After flocculation, the liquid is filtered to remove the precipitate; after filtration, the clear liquid is added with a decolorizing agent for heat preservation and decolorization; after decolorization, the clear liquid is separated by ion exchange resin, and pure water is selected as the eluent for elution, and the levoglucosan The eluate was concentrated and precipitated with methanol to obtain the product levoglucosan. The invention can remove a large amount of impurities in the stock solution of the wood vinegar through pretreatment, and effectively separate the levoglucosan component in the wood vinegar.

Description

technical field [0001] The invention relates to a method for separating wood vinegar, in particular to a method for separating levoglucosan components in wood vinegar. Background technique [0002] Wood vinegar is a dark brown liquid, which is obtained by condensing the vapors produced during the dry distillation and pyrolysis of various biomass wastes such as sawdust, wheat straw and wood to produce fuel gas. Wood vinegar has important application value in many aspects: in medicine, wood vinegar has a good curative effect on diabetes and liver disease, and at the same time, wood vinegar can also prevent and treat skin diseases and beriberi Function; in agriculture, wood vinegar can effectively drive away pests, and also has a bactericidal effect, thereby greatly reducing the use of pesticides, which plays a very important role in the protection of the ecological environment; in light industry, wood vinegar It can be used as an additive for many items, such as cosmetics and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/02
CPCC08B37/0003
Inventor 曹飞叶天吴菁岚武红丽樊茂祥
Owner NANJING TECH UNIV
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