Method for degrading lignin in seawater

A technology of lignin and seawater, applied in the energy field, can solve the problems of reduced utilization value, high raw material cost and separation cost, damage to benzene ring structure, etc., and achieves the effects of low cost, safe operation and wide source of raw materials

Inactive Publication Date: 2015-07-15
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 10g of Alcell lignin and 100ml of natural seawater and transfer to the autoclave (Parr4740). After replacing the air with nitrogen 3-5 times, heat to 260°C. After 8 hours of reaction, the stirring was stopped, the temperature was lowered to room temperature, and 40 mL of chloroform was added in 3 times to extract the reaction solutions and then combined, and the organic liquid mixture was distilled to obtain 9.0 g, which accounted for 90% of the charged amount. The products were analyzed by chromatography-mass spectrometry. The main products were coniferyl alcohol (40%), coumarol (35%), vanillin (12%), syringyl derivatives (8%), and other products 5% (including Dimers and trimers).

Embodiment 2

[0021] Mix 3g of Alcell lignin with 10ml of sea water and transfer to a pressure-resistant airtight container (Swagelokminitube). After replacing the air with nitrogen 3-5 times, heat to 350°C. After 20 hours of reaction, the stirring was stopped, the temperature was lowered to room temperature, and 40 mL of petroleum ether was added in 3 times to extract the reaction solution and then combined, and the organic liquid mixture was obtained by distillation, which was 2.5 g, which accounted for 83% of the charge. The products were analyzed by chromatography-mass spectrometry. The main products were coniferyl alcohol (38%), coumarol (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 product distribution, and the proportion of product units is determined by the properties of lignin itself.

Embodiment 3

[0023] Mix 6g of Alcell lignin and 10ml of sea water and transfer to a pressure-resistant airtight container (Swagelokminitube). After replacing the air with nitrogen 3-5 times, heat to 350°C. After reacting for 20 hours, the stirring was stopped, the temperature was lowered to room temperature, and 40 mL of petroleum ether was added in 3 times to extract the reaction solution and then combined, and the organic liquid mixture was distilled to obtain 3.2 g, accounting for 53% of the charge. The products were analyzed by chromatography-mass spectrometry. The main products were coniferyl alcohol (34%), coumarol (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 was significantly reduced, 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 specifically 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, mankind needs to seek sustainable above-ground carbon resources in order to achieve sustainable development with zero carbon emissions off the surface. Lignin is the third organic carbon resource in the earth after cellulose and chitin. It is estimated that 150 billion tons of lignin can be produced from plant growth every year, and its utilization prospects are broad. The basic structural unit of lignin contains an aromatic ring structure. It 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 for the preparation of aromatic compounds. [0003] The current utilization methods of lignin take advanta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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