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Method for degrading lignin in seawater

A lignin and seawater technology, applied in the field of energy, can solve the problems of destroying the benzene ring structure, reducing the utilization value, high cost of raw materials and high separation cost, and achieve the effect of safe and simple operation

Inactive Publication Date: 2014-05-28
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have high raw material costs and separation costs, especially the thermal cracking and hydrocracking routes, which destroy the benzene ring structure and reduce its utilization value.

Method used

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  • Method for degrading lignin in seawater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Mix 10 g of Alcell lignin with 100 ml of natural seawater and transfer to an autoclave (Parr 4740). After replacing the air with nitrogen 3-5 times, heat to 260°C. After reacting for 8 hours, stop stirring, drop to room temperature, add 40mL of chloroform to extract the reaction solution in 3 times respectively, combine them, and distill to obtain 9.0 grams of organic liquid mixture, accounting for 90% of the feeding amount. The product was analyzed by chromatography-mass spectrometry. The main products were coniferyl alcohol (40%), coumaryl alcohol (35%), vanillin (12%), syringyl derivatives (8%), and other products 5% (including dimers and trimers).

Embodiment 2

[0021] Mix 3 g of Alcell lignin with 10 ml of seawater and transfer to a pressure-proof airtight container (Swagelokminitube). After replacing the air with nitrogen 3-5 times, heat to 350°C. After reacting for 20 hours, stop stirring, lower to room temperature, add 40mL of petroleum ether extraction reaction solution in 3 times respectively, combine, and distill to obtain 2.5 grams of organic liquid mixture, accounting for 83% of the feeding amount. The product was analyzed by chromatography-mass spectrometry. The main products were coniferyl alcohol (38%), coumaryl alcohol (36%), vanillin (15%), syringyl derivatives (6%), and other products 5% (including dimers and trimers). From the experimental results, using the same raw material, changing the reaction conditions has little effect on the distribution of products, and the proportion of product units is determined by the properties of lignin itself.

Embodiment 3

[0023] Mix 6 g of Alcell lignin with 10 ml of seawater and transfer to a pressure-tight container (Swagelokminitube). After replacing the air with nitrogen 3-5 times, heat to 350°C. After reacting for 20 hours, stop stirring, drop to room temperature, add 40mL petroleum ether extraction reaction solution respectively in 3 times, combine, and distill to obtain 3.2 grams of organic liquid mixture, accounting for 53% of the feeding amount. The product is analyzed by chromatography-mass spectrometry, and the main products are coniferyl alcohol (34%), coumaryl alcohol (35%), vanillin (17%), syringyl derivatives (5%), and other products 9% (including dimers and trimers). From the experimental results, increasing the amount of lignin, the yield of organic liquid products decreased significantly, and the amount of polymers also increased.

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Abstract

The invention discloses a method for degrading lignin in seawater. The method comprises the following steps: at the temperature of 150-500 DEG C, after the lignin is mixed with the seawater for reaction for no less than 0.5 h, separating to obtain the mixed product of phenolic compounds, wherein the total weight of the mixed product of the phenolic compounds accounts for more than 20% of the weight of the lignin in feeding materials. The method has the advantages of wide source of raw materials, simplicity in separation, high product yield and the like, and is suitable for preparing the phenolic compounds such as coniferyl alcohol, tonquinol, vanillic aldehyde, syringyl derivatives and the like by using biomass resources as raw materials.

Description

technical field [0001] The invention belongs to the field of energy, and in particular relates to a method for degrading lignin in seawater Background technique [0002] With the reduction of underground carbon resources and the increasing difficulty of utilization, human beings need to seek sustainable above-ground carbon resources in order to achieve sustainable development with zero carbon emissions outside the surface. Lignin is the third organic carbon resource after cellulose and chitin on the earth. It is estimated that 150 billion tons of lignin can be produced by plant growth in the world every year, and its utilization prospect is broad. The basic structural unit of lignin contains an aromatic ring structure, which is the only substance with an aromatic ring structure in sustainable carbon resources. It is one of the important ways to replace and supplement the existing fossil resources to prepare aromatic compounds. [0003] The current utilization method of lign...

Claims

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Application Information

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IPC IPC(8): C07C37/54
CPCC07C41/26C07C45/64C07D311/46C07C43/23C07C47/58
Inventor 王峰宋奇徐杰王业红张晓辰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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