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Bifunctional biochar-based solid acid catalyst, and preparation method and application thereof

A carbon-based solid acid and bifunctional technology, which is applied in physical/chemical process catalysts, chemical instruments and methods, biofuels, etc., can solve the problems of high requirements for equipment and reaction conditions, poor industrial availability, and time-consuming and energy-consuming reactions. problem, achieve the effect of shortening the reaction time of esterification, stabilizing performance and improving efficiency

Inactive Publication Date: 2019-08-06
NORTHEAST AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Solid catalysts have attracted widespread attention due to their high reactivity, recyclability, and environmental friendliness. Currently, carbon-based solid catalysts have problems such as unstable activity, unstable structure, low cyclability, and low efficiency. At the same time, the equipment required for the reaction And the reaction conditions are relatively high, the reaction consumes energy and the efficiency is low
And, in order to increase the yield, it is often necessary to add a lot of expensive or toxic substances as solvents, and the industrial availability is poor

Method used

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  • Bifunctional biochar-based solid acid catalyst, and preparation method and application thereof
  • Bifunctional biochar-based solid acid catalyst, and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0018] (1) Take a certain amount of jatropha seed husks, mechanically pulverize them into solid powders of approximately the same size, wash with deionized water, suction filter 3 times, and dry at 80° C. for 8 hours;

[0019] (2) Mix the washed and dried jatropha seed shells with ammonium lignosulfonate at a mass ratio of 13:1, and then carbonize at 500°C for 2.5 hours under the protection of nitrogen to make a carbon-based precursor loaded with amino groups ;

[0020] (3) Put the carbon-based precursor loaded with amino group and concentrated sulfuric acid at a mass volume ratio of 1g:8mL, add them into a hydrothermal reaction kettle for sulfonation, and heat at 80°C for 2h; The mixture carrier of ammonium lignosulfonate was washed with deionized water until the solution was neutral, and finally it was vacuum-dried at 80° C. for 8 hours to obtain a granular bifunctional biomass carbon-based solid acid catalyst;

[0021] (4) For the preparation of biodiesel, in the process o...

Embodiment 2

[0023] (1) Take a certain amount of jatropha seed husks, mechanically pulverize them into solid powders of approximately the same size, wash with absolute ethanol, suction filter 3 times, and dry at 100° C. for 8 hours;

[0024] (2) Mix the washed and dried jatropha seed shells with ammonium lignosulfonate at a mass ratio of 12:1, and then carbonize at 600°C for 2 hours under the protection of nitrogen to make a carbon-based precursor loaded with amino groups;

[0025] (3) Put the carbon-based precursor loaded with amino groups and oleum at a mass volume ratio of 1g:10mL, add them to the distillation reaction device for sulfonation, and heat at 80°C for 3h; The mixture carrier of ammonium lignosulfonate was washed with deionized water until the solution was neutral, and finally it was vacuum-dried at 80° C. for 8 hours to obtain a granular bifunctional biomass carbon-based solid acid catalyst;

[0026] (4) For the preparation of biodiesel, in the process of catalytic fatty aci...

Embodiment 3

[0028] (1) Take a certain amount of jatropha seed husks, mechanically pulverize them into solid powders of approximately the same size, wash with deionized water, suction filter 3 times, and dry at 80° C. for 8 hours;

[0029] (2) Mix the washed and dried jatropha seed shells with ammonium lignosulfonate at a mass ratio of 8:1, and then carbonize at 400°C for 3 hours under the protection of nitrogen to make a carbon-based precursor loaded with amino groups;

[0030] (3) Put the carbon-based precursor loaded with amino groups and concentrated sulfuric acid at a mass volume ratio of 1g:15mL, add them to the distillation reaction device for sulfonation, and heat at 100°C for 3h; The mixture carrier of ammonium sulfonate was washed with deionized water until the solution was neutral, and finally it was vacuum-dried at 80° C. for 8 hours to obtain a granular bifunctional biomass carbon-based solid acid catalyst;

[0031] (4) In order to prepare biodiesel, in the process of catalyti...

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Abstract

The invention discloses a bifunctional biochar-based solid acid catalyst, and a preparation method and an application thereof. A mixture of Jatropha curcus seed shells used as a carrier and ammonium lignosulfonate used as an activator is carbonized at a high temperature to form an amino group-supported carbon-based precursor, and carrying out a sulfonation reaction under a heating condition to introduce a sulfonic acid group to the carbon-based precursor in order to prepare the bifunctional biochar-based solid acid containing an amino group and the sulfonic acid group. The catalyst has a yieldreaching up to 93% or above when used to catalyze a methyl esterification reaction of fatty acids under optimal use conditions. The raw material of the solid acid is agricultural and forestry wastesand industrial wastes, the preparation process and the separation operation are simple, the biochar-based solid acid has the advantages of strong acidity, stable performances, low cost, environmentalfriendliness, recyclability and the like, and the two functional groups of the solid acid have synergistic effects in the methy esterification process of the fatty acids to effectively increase the conversion rate, and a new method is provided for preparing biodiesel from high acid value oils.

Description

technical field [0001] The invention belongs to the technical field of biodiesel preparation and solid acid catalyst application, and in particular relates to a bifunctional biomass carbon-based solid acid catalyst and its preparation method and application. Background technique [0002] As an ideal alternative energy source for fossil diesel, biodiesel is a green and clean fuel produced from vegetable oil and waste oil resources, but vegetable oil and waste oil contain high free fatty acids, and the preparation of biodiesel by alkaline catalysts is prone to saponification reaction At the same time, the homogeneous acid catalyst (such as sulfuric acid, etc.) widely used in industry corrodes equipment when used, and the reaction product is difficult to separate from the catalyst. A large amount of waste water is generated during the treatment, which pollutes the environment. Due to the above limitations, heterogeneous solid acid catalysts, as a new class of acid catalysts, ca...

Claims

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Application Information

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IPC IPC(8): B01J27/24C11C3/00C10L1/02
CPCB01J27/24C10L1/02C11C3/003Y02E50/10
Inventor 王勇姜明昊
Owner NORTHEAST AGRICULTURAL UNIVERSITY
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