Method for preparing high-yield hydrothermal carbon microspheres through slurrying pre-hydrolysis liquid

A technology of pre-hydrolyzate and carbon microspheres, which is applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal oxides/hydroxides, etc., can solve the problems of high price and difficult separation and purification of pre-hydrolyzate, Achieve the effects of simple operation, value-added utilization and high yield

Inactive Publication Date: 2019-05-28
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the separation and purification of the pre-hydrolyzate is difficult and expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Add 1.6 g of sulfuric acid (calculated without water) to the 20 g pulping pre-hydrolyzate to make the acid concentration of the pre-hydrolyzate reach 8%;

[0021] (2) Add 0.12 g of acrylic acid as a functional agent to the pulping pre-hydrolyzate obtained in step (1), place the solution in a 40 mL polytetrafluoroethylene reactor, and conduct a hydrothermal reaction at 180°C for 12 hours, and wait for the device to cool , the solid-liquid separation of the obtained mixture was carried out by vacuum filtration, and the solid was washed with ethanol and water several times, and then dried in a vacuum oven at 60°C to obtain high-yield hydrothermal carbon microspheres;

[0022] (3) Disperse the above-mentioned hydrothermal carbon microspheres in a sodium hydroxide solution, stir and activate them for 1 hour, filter them, and wash the carbon microspheres with deionized water until they are neutral to obtain a high-yield functionalized hydrothermal carbon Microspheres.

Embodiment 2

[0024] (1) Add 1 g of hydrochloric acid (calculated without water) to 20 g of pulping pre-hydrolyzate to make the acid concentration of the pre-hydrolyzate reach 5%;

[0025] (2) Add 0.1 g of acrylic acid as a functional agent to the pulping pre-hydrolyzate obtained in step (1), place the solution in a 40 mL polytetrafluoroethylene reactor, and conduct a hydrothermal reaction at 160°C for 14 hours, and wait for the device to cool down , the solid-liquid separation of the obtained mixture was carried out by vacuum filtration, and the solid was washed with ethanol and water several times, and then dried in a vacuum oven at 60°C to obtain high-yield hydrothermal carbon microspheres;

[0026] (3) Disperse the above-mentioned hydrothermal carbon microspheres in sodium hydroxide solution, stir and activate them for 2 hours, filter them, and wash the carbon microspheres with deionized water to neutrality, that is, a high-yield functionalized hydrothermal carbon Microspheres.

Embodiment 3

[0028] (1) Add 0.4 g of nitric acid (calculated without water) to 20 g of pulping pre-hydrolyzate to make the acid concentration of pre-hydrolyzate to 2%;

[0029] (2) Add 0.15 g of acrylic acid as a functional agent to the pulping pre-hydrolyzate obtained in step (1), place the solution in a 40 mL polytetrafluoroethylene reactor, and conduct a hydrothermal reaction at 190°C for 8 hours, and wait for the device to cool down , the solid-liquid separation of the obtained mixture was carried out by vacuum filtration, and the solid was washed with ethanol and water several times, and then dried in a vacuum oven at 60°C to obtain high-yield hydrothermal carbon microspheres;

[0030] (3) Disperse the above-mentioned hydrothermal carbon microspheres in potassium hydroxide solution, stir and activate them for 3 hours, filter them, and wash the carbon microspheres with deionized water to neutrality, that is, a high-yield functionalized hydrothermal carbon Microspheres.

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Abstract

The invention discloses a method for preparing high-yield hydrothermal carbon microspheres through slurrying pre-hydrolysis liquid. The method comprises the following steps: (1) a certain amount of inorganic acid is added into the slurrying pre-hydrolysis liquid to enable the acid concentration of the pre-hydrolysis liquid to be within the appropriate range; (2) a certain amount of acrylic acid isadded to serve as a functional agent, a hydrothermal reaction is conducted at a certain temperature and certain time, filtering, washing and drying are conducted, and hydrothermal carbon microspheresare obtained; and (3) the hydrothermal carbon microsphere are dispersed in an alkali solution to be stirred and activated for certain time, and the high-yield functional hydrothermal carbon microspheres are obtained. Carbohydrate and lignin in the slurrying pre-hydrolysis liquid are utilized as a carbon source, and through the hydrothermal carbonization reaction, the high-yield hydrothermal carbon microspheres are prepared; and the prepared hydrothermal carbon microspheres are high in yield and good in spherical morphology, the surfaces of the hydrothermal carbon microspheres contain a largenumber of oxygen-containing active sites, the carbohydrate and lignin resources in the pre-hydrolysis liquid are utilized, and the problem of pollution of wastewater of paper making enterprises to theenvironment is further relieved.

Description

technical field [0001] The invention relates to a method for preparing high-yield hydrothermal carbon microspheres from pulping prehydrolyzate, and belongs to the technical field of functional materials. Background technique [0002] For decades, carbon materials have received extensive attention in multiple fields, including energy storage, adsorption, catalysis, and biological applications. Due to the spherical shape of carbon spheres, it becomes a carbon material with special properties, such as: large specific surface area, high packing density, excellent mechanical strength and low flow resistance. Therefore, carbon spheres can be widely used as catalyst supports, Electrode materials and adsorption materials under solid-liquid or solid-gas contact conditions. However, the preparation of carbon microspheres from petroleum-based resources (such as styrene, toluene, benzene, pitch, etc.) is not only expensive but also non-renewable. In recent years, the production of car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28
Inventor 孙润仓曹学飞王圆圆孙少妮袁同琦
Owner BEIJING FORESTRY UNIVERSITY
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