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Method for directionally preparing benzene by utilizing xylogen

A lignin and directional conversion technology, which is applied in the direction of cracking polyarylate compounds on the bond between six-membered aromatic rings to produce hydrocarbons, bulk chemical production, etc., can solve the problems that have not yet been seen in the controllable conversion technology of lignin, and achieve Realize the effect of recycling and abundant resources

Inactive Publication Date: 2014-06-11
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The use of lignin to produce benzene can provide basic chemical raw materials and an important molecule for the development of high-end chemicals for the petrochemical industry. However, there have been no reports on the controllable conversion technology of lignin aimed at the directional production of benzene.

Method used

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  • Method for directionally preparing benzene by utilizing xylogen
  • Method for directionally preparing benzene by utilizing xylogen
  • Method for directionally preparing benzene by utilizing xylogen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 depolymerizes lignin into aromatic monomers

[0020] In the process of this example, the lignin raw material was purchased from Hefei Lanxu Biotechnology Co., Ltd. The main elements in the lignin raw material are carbon, hydrogen and oxygen (the element ratio is C:H:O=62.55:5.83:31.62). The catalyst for lignin depolymerization is 15wt%Ni / HZSM-5 modified zeolite catalyst. The preparation steps of the catalyst are as follows: weigh 37.5g of nickel nitrate hexahydrate, add 100mL of deionized water to configure a nickel nitrate solution; then add 20g of HZSM-5 zeolite powder with a silicon-aluminum ratio of 25 into the upper nickel nitrate solution , Shake the solution to cover the powder of ZSM-5, let it soak for 24 hours, then evaporate the water in the solution in an 80-degree water bath, then dry it in an oven at 120 degrees, and then sinter it in a muffle furnace at 550 degrees for 6 hours . Then the prepared 15wt%Ni / HZSM-5 catalyst and binding agent (k...

Embodiment 2

[0026] Embodiment 2 makes the directional conversion of aromatic monomer into benzene

[0027] In the present embodiment process, reactant raw material adopts in embodiment 1 at 600 o C and current are aromatic monomer mixtures produced by catalytic depolymerization of lignin under the condition of 0A. The catalyst adopts 10wt% Re / Y type rhenium-containing zeolite catalyst. The preparation steps of the catalyst are as follows: weighing 16g of rhenium nitrate, adding 100mL of deionized water to configure a rhenium nitrate solution; Make the solution submerge the powder of HY zeolite, let it stand for immersion for 24 hours, evaporate the moisture in the solution in an 80-degree water bath, then dry it in an oven at 120 degrees, and then sinter it in a muffle furnace at 550 degrees for 6 hours. Then the prepared 10wt%Re / Y type zeolite catalyst and binding agent (kaolin or Tianjing powder) are mixed and ground in a certain proportion to obtain mixed powder, wherein the binding ...

Embodiment 3

[0034] Example 3 Coupling method for depolymerization of lignin and directional conversion of aromatic monomers into benzene

[0035] In the process of this example, the lignin raw material is derived from the lignin sample of Hefei Lanxu Biotechnology Co., Ltd., and the main elements in the lignin raw material are carbon, hydrogen and oxygen elements (the element ratio is C:H:O=62.55:5.13 :32.30). The lignin depolymerization catalyst was a commercially available HZSM-5 zeolite with a silicon-aluminum ratio of 100, and the aromatic monomer conversion catalyst was a commercially available 16% ReY catalyst. The two catalysts were mixed in a ratio of 1:1, and 10wt% kaolin was added as a binder. That is, a finished bifunctional catalyst product with lignin depolymerization and directional conversion of monomers into benzene is obtained.

[0036] The catalytic conversion reactor used is a cylindrical fixed-bed catalytic reactor with external heating and insulation layer. Its two...

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Abstract

The invention relates to a method for directionally preparing benzene by utilizing xylogen. The method comprises the following steps of: selecting a cylindrical fixed bed catalytic reactor with a conductive metal wire arranged in a cavity; depolymerizing to converte xylogen to an aromatic monomer, wherein a led raw material is the xylogen, a catalyst is powder zeolite catalyst or modified zeolite catalyst containing transition metal nickel element, the usage amount is characterized in that the weight ratio of the catalyst to the xylogen is 0.3-10 per hour, and a product is a liquid-state aromatic monomer mixer; and directionally converting the aromatic monomer mixer into benzene, wherein a led raw material is the aromatic monomer mixer which is preheat to be 200-250 DEG C, a catalyst is powder zeolite catalyst containing an Re element, the usage amount is characterized in that the weight ratio of the aromatic monomer mixer to the zeolite catalyst containing the Re element is 0.2-15 per hour, and a product is mixed liquid taking the benzene as the main part. According to the method, an external hydrogen source is not needed, the raw material resources are rich, and higher benzene yield and benzene selectivity can be obtained at intermediate temperature and constant pressure as well as under a green and mild reaction environment.

Description

technical field [0001] The invention relates to a method for directional production of benzene by utilizing lignin. Background technique [0002] Benzene is an important basic chemical raw material in the petrochemical industry. The light tar produced in the coal coking process contains a certain amount of benzene. About 1 kg of benzene can be extracted from 1 ton of coal. At present, most of the benzene in the world comes from non-renewable fossil raw materials. The three most important processes for producing benzene are petroleum catalytic reforming, toluene hydrodealkylation and steam cracking. With the massive consumption of coal and petroleum traditional resources and the emphasis on environmental protection, it is urgent to develop renewable green alternative raw materials. [0003] The total amount of biomass generated by photosynthesis on the earth exceeds 200 billion tons every year, which is the most abundant renewable resource. Lignin is the second largest na...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/04C07C4/26
CPCY02P20/52
Inventor 李全新巩飞艳范明慧朱九方姜沛文邓淑梅
Owner UNIV OF SCI & TECH OF CHINA
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