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Method for producing aryl compound by using lignin

A technology of lignin and compounds, applied in the preparation of organic compounds, chemical instruments and methods, organic chemistry, etc., can solve problems such as waste of resources, environmental pollution, etc., and achieve the effects of reducing production costs, shortening reaction time, and reducing production costs

Active Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This not only wastes resources, but also causes serious environmental pollution

Method used

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  • Method for producing aryl compound by using lignin
  • Method for producing aryl compound by using lignin

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Take 50g of alkali lignin and mix with 800g of distilled water, and adjust the pH value to 2 with hydrochloric acid. Stirring treatment was carried out at 70°C for 3 hours in a water bath. Then the resulting precipitate was filtered, washed with distilled water until neutral, and dried to obtain lignin. The elemental compositions of alkali lignin and lignin are shown in Table 1. After the alkali lignin is transformed into lignin by purified acid treatment, the impurity content is greatly reduced, the C content in the lignin increases from 33.62% to 60.51%, and the H content increases from 4.41% to 6.24%. High-purity lignin is very beneficial to the increase of liquid yield after lignin catalytic hydrocracking.

[0026] Table 1 Elemental composition of alkali lignin and lignin

[0027]

Alkali lignin / wt%

Lignin / wt%

C

33.62

60.51

[0028] H

4.14

6.24

O

34.11

26.20

Impurity elements ...

Embodiment 2

[0032] Get 70g alkali lignin (same as embodiment 1) and mix with 700g distilled water, adjust pH value to 3 with sulfuric acid. Stirring treatment was carried out at 75°C for 2.5 hours in a water bath. Then the resulting precipitate was filtered, washed with distilled water until neutral, and dried to obtain lignin.

[0033] Get 150g lignin, 2g Ni-Mo / Y catalyst (the content of NiO is 7wt% in the Ni-Mo / Y catalyst, MoO 3 The content is 18wt%, and the balance is Y-type zeolite), 0.5g carbon disulfide, 650g tetrahydronaphthalene are placed in the autoclave, and then the air in the autoclave is replaced 3 times with hydrogen. Then pass hydrogen to 5MPa, check the airtightness, and ensure that the airtightness is good.

[0034] Then the autoclave was heated to 380° C., and the reaction was continued at this temperature for 15 minutes. Then the autoclave was naturally cooled to room temperature, the autoclave was opened, and the liquid product was separated for gas chromatography ...

Embodiment 3

[0036] Get 100g alkali lignin (same as embodiment 1) and mix with 1000g distilled water, adjust pH value to 3 with nitric acid. Stirring treatment was carried out at 80°C for 1.5 h in a water bath. Then the resulting precipitate was filtered, washed with distilled water until neutral, and dried to obtain lignin.

[0037] Get 100g lignin, 3g Co-Mo / β catalyst (the content of CoO is 9wt% in the Co-Mo / β catalyst, MoO 3 The content is 22wt%, and the balance is beta zeolite), 0.8g dimethyl sulfide, and 400g tetralin are placed in the autoclave, and then the air in the autoclave is replaced 3 times with hydrogen. Then pass in hydrogen to 6.5MPa, check the airtightness, and ensure that the airtightness is good.

[0038] Then the autoclave was heated to 420° C., and the reaction was continued at this temperature for 10 min. Then the autoclave was naturally cooled to room temperature, the autoclave was opened, and the liquid product was separated for gas chromatography analysis. The...

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Abstract

The invention discloses a method for producing an aryl compound by using lignin. In the invention, a bifunctional catalyst is adopted to crack lignin through catalytic hydrogenation. Compared with the prior art, at the same reaction temperature, the method provided by the invention has the advantages that lower initial hydrogen gas pressure and shorter reaction time are utilized, the yield of a liquid product can reach more than 65%, and the content of the aryl compound in the liquid product accounts for more than 65%. According to the method, the production cost is reduced significantly.

Description

technical field [0001] The invention relates to a method for producing liquid compounds from lignin, especially a method for producing aryl-rich compounds. Background technique [0002] Biomass energy is derived from biomass, which is a form of energy in which solar energy is stored in organisms in the form of chemical energy, and it comes directly or indirectly from photosynthesis of plants. Biomass energy has many advantages such as huge reserves, renewable, and environmental protection. Biomass is mainly composed of cellulose, hemicellulose and lignin. Lignin (lignin for short) is an important component of biomass. On the earth, except mosses and fungi, all plants contain lignin, and the amount of lignin in nature is second only to cellulose. Lignin has unique aromatic and aliphatic properties and is the only non-petroleum resource in nature that can provide renewable aromatic compounds, so it can be used to replace oil and natural gas for the production of low-molecul...

Claims

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Application Information

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IPC IPC(8): C07C37/52
Inventor 范峰凌凤香陈琳黎元生张喜文王丽君
Owner CHINA PETROLEUM & CHEM CORP
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