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Method for preparing important chemicals by using lignin as methyl sources

A lignin and methyl source technology, applied in chemical instruments and methods, amino compound preparation, bulk chemical production, etc., can solve problems such as low conversion rate, difficult reaction and utilization, complex structure, etc., and achieve important application prospects Effect

Inactive Publication Date: 2019-05-21
INST OF CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, there have been many reports on the conversion of lignin model compounds into chemicals or fuels. Although satisfactory results have been achieved, the conversion rate is usually not high when the catalytic system is applied to real lignin.
Furthermore, the highly selective preparation of important chemicals through lignin conversion is a great challenge due to the complex structure of lignin
The chemicals obtained through lignin depolymerization are often a mixture of various compounds, which brings many difficulties to the subsequent reaction and utilization
[0004] Lignin contains a large number of methoxy groups (as shown in formula I), however, the selective use of methoxy groups to prepare important chemicals has not been reported

Method used

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  • Method for preparing important chemicals by using lignin as methyl sources
  • Method for preparing important chemicals by using lignin as methyl sources
  • Method for preparing important chemicals by using lignin as methyl sources

Examples

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Embodiment 1

[0040] Embodiment 1: the preparation of acetic acid

[0041] Lignin was used as a methyl source to react with carbon monoxide and water to prepare acetic acid in a stainless steel reactor with a polytetrafluoroethylene liner with a volume of 16 ml, and the reactor was stirred by a magnet. In the experiment, a certain amount of ruthenium or rhodium-containing catalyst, iodide and fluoroborate additives, lignin, water and reaction solvent are added to the reactor, and the reactor is sealed and replaced three times with 1MPa nitrogen gas. Carbon monoxide at a specific pressure is charged into the reactor. The reactor was placed in an air bath at a constant temperature, and the electromagnetic stirring speed was set at 800 rpm. After the reaction, the reactor was cooled in an ice-water bath, and the gas was released. About 0.04 g of 1,3,5-trioxane was added as an internal standard to the reacted liquid mixture, and then the liquid mixture was diluted with 10 ml of methanol and s...

Embodiment 2

[0097] Embodiment 2: the preparation of N-methylation product

[0098] Lignin was used as a methyl source to react with amine compounds to prepare N-methyl compounds in a 16ml stainless steel reactor with a polytetrafluoroethylene liner, and the reactor was magnetically stirred. In the experiment, a certain amount of iodide catalyst and optional fluoroborate co-catalyst, lignin or anisole, amine and reaction solvent are added to the reactor, the reactor is sealed and replaced three times with 1MPa nitrogen, and The reaction kettle was placed in an air bath at a constant temperature, and the electromagnetic stirring speed was set at 800 rpm. After the reaction, the reactor was cooled in an ice-water bath. About 0.04 g of 1,3,5-trioxane was added as an internal standard to the reacted liquid mixture, and then the liquid mixture was diluted with 10 ml of methanol and stirred for 5 minutes. The above mixture was centrifuged with 1 H NMR (Bruker Avance III 400HD), the deuterium ...

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Abstract

The invention relates to preparation of important chemical products by using methoxyl groups in lignin. According to a method, methyl provided by the lignin reacts with carbon monoxide and water underthe catalysis effects of catalysts to obtain acetic acid; reaction is performed with aminated compounds to obtain N-methylation products. The methoxyl groups in the lignin are used for preparing important chemical products for the first time; an important and continuous production path is provided for the preparation of various important chemical products.

Description

technical field [0001] The invention belongs to the field of chemistry and chemical engineering, and relates to a method for preparing important chemicals by providing methyl groups from lignin. Background technique [0002] Biomass resources are an abundant and renewable carbon resource. The use of biomass as a raw material to prepare important chemicals can reduce human dependence on fossil resources, and is an extremely important non-petroleum raw material chemical route. Lignocellulose is the most abundant biomass, with an annual output of about 170 billion tons, of which about 20% is lignin (T.E.Amidon, S.Liu, Biotechnol.Adv.2009, 27, 542-550.), and is used in pulp and paper A large number of lignin by-products are also produced in the industrial production process. The simple burning of lignin is increasingly considered to be a waste of its value, and the efficient use of lignin is of great significance to the sustainable development of society (C.O.Tuck, E.Pérez, I....

Claims

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Application Information

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IPC IPC(8): C07C51/12C07C53/08C07C209/00C07C211/48C07C211/47C07C211/52C07C253/30C07C255/58
CPCY02P20/54
Inventor 刘会贞梅清清韩布兴杨冠英孟庆磊刘航宇
Owner INST OF CHEM CHINESE ACAD OF SCI
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