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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Problems solved by technology

This not only wastes resources, but als

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

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Example Embodiment

[0024] Example 1

[0025] Mix 50 g of alkali lignin with 800 g of distilled water, and adjust the pH to 2 with hydrochloric acid. Stir and process for 3h under 70℃ water bath condition. Then the obtained precipitate is filtered, washed with distilled water to neutrality, and dried to obtain lignin. The elemental composition of alkali lignin and lignin is shown in Table 1. After alkali lignin is converted into lignin by purified acid treatment, the content of impurities is greatly reduced. Compared with alkali lignin, the C content in 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 improvement of liquid yield after lignin catalytic hydrocracking.

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

[0027]

[0028] H

[0029] Take 120g lignin, 1.2g Ni-W / Y catalyst (Ni-W / Y catalyst content of NiO is 6wt%, WO 3 The content is 20wt%, the balance is Y-type zeolite), 0.24g of sul...

Example Embodiment

[0031] Example 2

[0032] Take 70 g of alkali lignin (same as Example 1) and mix with 700 g of distilled water, and adjust the pH to 3 with sulfuric acid. Stir for 2.5h under 75℃ water bath condition. Then the obtained precipitate is filtered, washed with distilled water to neutrality, and dried to obtain lignin.

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

Example Embodiment

[0035] Example 3

[0036] Take 100g of alkali lignin (same as Example 1) and mix with 1000g of distilled water, and adjust the pH to 3 with nitric acid. Stir and process for 1.5h under 80℃ water bath condition. Then the obtained precipitate is filtered, washed with distilled water to neutrality, and dried to obtain lignin.

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

[0038] Then the autoclave was heated to 420°C, and the reaction was continued at this temperature for 10 minutes. Then the autoclave was naturally cooled to room temperature, the autoclave was opened, and the liquid product was separated and analyzed by gas chromatogra...

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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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