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A method for improving the hydrogen utilization rate of the hydrodeoxygenation reaction of guaiacol under normal pressure and reducing the loss of carbon atoms

A technology of guaiacol and deoxygenation reaction, which is applied in the direction of chemical instruments and methods, molecular sieve catalysts, carbon compound catalysts, etc., can solve the problems of adding aromatic hydrocarbons, etc., to improve the utilization rate of hydrogen, reduce the consumption of hydrogen, The effect of reducing the loss

Active Publication Date: 2017-08-11
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Today, the addition of aromatic hydrocarbons to gasoline or diesel fuel pools is still limited by technical legislation

Method used

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  • A method for improving the hydrogen utilization rate of the hydrodeoxygenation reaction of guaiacol under normal pressure and reducing the loss of carbon atoms
  • A method for improving the hydrogen utilization rate of the hydrodeoxygenation reaction of guaiacol under normal pressure and reducing the loss of carbon atoms
  • A method for improving the hydrogen utilization rate of the hydrodeoxygenation reaction of guaiacol under normal pressure and reducing the loss of carbon atoms

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 Effect of Different Catalysts on Synergistic Transmethylation of Guaiacol Hydrodeoxygenation

[0029] Experimental conditions: feed rate 0.1g / min, catalyst dosage 18g, hydrogen flow rate 0.29 L / min. The feed amount of guaiacol and hydrogen was controlled at a molar ratio of 1:40. Reaction temperature: 350°C, reaction pressure: normal pressure, 1 / WHSV is 3.0h -1 , Selected catalysts: Fe / Ni / HBeta, Fe / Ni / ZSM-5, Fe / Ni / HY, Fe / Ni / MCM-41, Fe / Ni / SiO 2 , Fe / Ni / Al 2 o 3 .

[0030] The results are shown in Table 1. Among the products of guaiacol hydrodeoxygenation, several products with more content are benzene, toluene, xylene, phenol, and other oxygen-containing compounds (such as 3-methylphenol, 3 , 5-dimethylphenol, etc.), other hydrocarbons with less content (such as trimethylbenzene, tetramethylbenzene, etc.).

[0031]

[0032] It can be seen from Table 1 that under the action of different catalysts, there are significant differences in the conversion rate...

Embodiment 2

[0039] Example 2 Effect of Ni / Fe loading on the distribution of guaiacol hydrodeoxygenation products

[0040] Experimental conditions: feed rate 0.1g / min, catalyst dosage 18g, hydrogen flow rate 0.29 L / min. The feed amount of guaiacol and hydrogen was controlled at a molar ratio of 1:40. Reaction temperature: 350℃, 1 / WHSV is 3.0h -1 , Reaction time 1h, reaction pressure: normal pressure. Selected catalyst: Fe / Ni / HY.

[0041] Changing the content of Ni / Fe significantly changed the selectivity and yield of each product (Table 4). When increasing the content of active substances, the content of benzene, toluene, xylene and other hydrocarbons all showed an upward trend, especially when the content of Ni / Fe increased from 5% to 10%, the selectivity of BTX changed from the original 5.84% of the active material increased to 13.94%, and then increased the loading of Fe / Ni, the content of BTX decreased instead, the yield of oxygenated compounds decreased first and then increased wi...

Embodiment 3

[0044] Example 3 Effect of reaction temperature on the effect of guaiacol hydrodeoxygenation reaction

[0045] Experimental conditions: feed rate 0.1 g / min, catalyst dosage 18 g, hydrogen flow rate 0.29 L / min. The feed amount of guaiacol and hydrogen was controlled at a molar ratio of 1:40. Reaction pressure: normal pressure, 1 / WHSV is 3.0h -1 , Reaction time 1h, selected catalyst: 10%Fe / Ni / HY.

[0046]

[0047]

[0048]In combination with Table 5, it can be seen that the conversion rate of guaiacol is significantly improved by increasing the reaction temperature. From the original 92% to 100%, the distribution of each product also showed significant differences. The yields of benzene, toluene, and xylene all increased significantly. With the increase of reaction temperature, the selectivity of oxygen-containing compounds did not change much, and the selectivity of phenol decreased to a certain extent. Deoxygenated compounds such as benzene, toluene, and xylene mainl...

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Abstract

The invention discloses a method for increasing the hydrogen utilization ratio of guaiacol during hydrodeoxygenation under the normal pressure and reducing carbon atom loss. The method is characterized by comprising the following steps: gasifying guaiacol, and mixing the gasifed guaiacol with hydrogen for reaction under the catalysis of an activated molecular sieve at the normal pressure with the temperature of 250-400 DEG C; while hydrodeoxygenation, allowing a methyl group on guaiacol to return to a benzene ring structure through transmethylation, so as to reduce the carbon atom loss and increase the hydrogen utilization ratio, wherein the activated molecular sieve is selected from Fe / Ni / HBeta, Fe / Ni / ZSM-5, Fe / Ni / HY, Fe / Ni / MCM-41, Fe / Ni / SiO2 or Fe / Ni / Al2O3. Through adoption of the method, the acquired BTX yield can reach up to 19.83%. In the method, an autoclave is eliminated, a transmethylation reaction is realized while hydrodeoxygenation, the carbon atom loss and hydrogen consumption are reduced, and a new way is provided for resource utilization of lignin under the normal pressure.

Description

technical field [0001] The invention relates to the technical field of biomass refining, and more specifically relates to a method for improving the hydrogen utilization rate of guaiacol hydrodeoxygenation reaction under normal pressure and reducing the loss of carbon atoms. Background technique [0002] Due to the excellent properties of lignin in all aspects, more and more researchers have turned their attention to the degradation experiments of lignin. It is a complex phenolic polymer composed of solids, and its pyrolysis products are phenolic polymers with high oxygen content, such as phenol, dimethoxyphenol and its derivatives, etc. There are many kinds of these compounds, which are generally difficult to pass through Simple process technology for separation and purification and separate utilization. [0003] A large part of lignin pyrolysis bio-oil represented by phenolic compounds faces the challenge of continuous refining. Catalytic conversion of these phenolic com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/20C07C15/02B01J29/76B01J29/46B01J29/14B01J29/03B01J23/755
CPCB01J23/755B01J29/0333B01J29/146B01J29/46B01J29/7615C07C1/20C07C2523/755C07C2529/03C07C2529/14C07C2529/46C07C2529/76C07C15/02
Inventor 许细薇蒋恩臣王明峰
Owner SOUTH CHINA AGRI UNIV
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