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A method for preparing biochar from organic waste by sulfonated carbon low-temperature catalysis

A technology of organic waste and biochar, applied in chemical instruments and methods, physical/chemical process catalysts, biofuels, etc., to achieve strong adsorption capacity, large specific surface area, and high value-added resource utilization

Active Publication Date: 2018-04-17
天津滨海道顺科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no research on the low-temperature catalytic preparation of biochar from sulfonated carbon, that is, the use of biomass charcoal to prepare sulfonated carbon catalysts, and the use of this catalyst to achieve low-cost, industrialized production of biochar technology and technology for low-temperature carbonization of organic waste. The equipment has not been reported so far

Method used

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  • A method for preparing biochar from organic waste by sulfonated carbon low-temperature catalysis
  • A method for preparing biochar from organic waste by sulfonated carbon low-temperature catalysis
  • A method for preparing biochar from organic waste by sulfonated carbon low-temperature catalysis

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Crush corn stalks into small pieces of 1-3 cm, heat them in an oxygen-limited muffle furnace at 480°C for 2 hours, and cool naturally to room temperature to prepare aromatic ring biochar, and then put the biochar into PTFE-lined reaction In the kettle, completely submerged with 98% oleum, sulfonated at 105°C under oxygen-limited conditions for 12 hours, suction-filtered and rinsed the sulfonated sulfonated carbon to pH 4.5, and freeze-dried at -18°C for 18 hours. A sulfonated carbon catalyst was obtained. attached by figure 1 The SEM images and attached figure 2 It can be seen that the specific surface area, high porosity and high sulfonation rate of sulfonated carbon are 112.5m 2 / g, 0.028cm 3 / g, 2.4mmol / g.

[0027] Crush the agricultural waste corn stalks to less than 0.5 cm, mix the sulfonated carbon catalyst and the crushed corn stalks evenly at a mass ratio of 1:100, and evenly spray clean water accounting for 1% of the total weight of the mixture on the mixt...

Embodiment 2

[0030] Grinding the waste residue of traditional Chinese medicine to below 0.2 cm, mixing the sulfonated carbon catalyst prepared in Example 1 and the waste residue of Chinese medicine after crushing with a mass ratio of 1:98, and spraying evenly on the mixture to account for 0.5% of the total weight of the mixture After being stirred evenly, the purified water enters the rotary heating reactor, and is heated in a closed rotary heater with a furnace temperature of 130°C for 2 hours, and the reactor speed is 100 revolutions / h to obtain biochar. attached by Figure 4 The SEM image shows that the biochar has a large specific surface area, high porosity, and high carbonization ratio, which are 100.1m 2 / g, 0.019cm 3 / g, 99.5%. The biochar has a maximum adsorption capacity of 13.5 mg / g for polybrominated diphenyl ethers BDE-47 with a concentration of 25 μg / L in sewage.

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Abstract

The invention relates to a method for preparing biomass charcoal by catalyzing organic waste at a low temperature with sulfonated char. Agricultural waste is prepared into biomass charcoal at a medium-temperature oxygen limited condition, and then the biomass charcoal is sulfonated by 95%-98% fuming sulphuric acid and is blanched and freeze-dried to obtain a sulfonated char catalyst, and the sulfonating efficiency is 1.9-2.5mmol / g. The method of preparing biomass charcoal by catalyzing organic waste at a low temperature comprises the steps of uniformly mixing the sulfonated char catalyst, crushed organic waste and water in a certain ratio, and heating the mixture in a closed reactor at the temperature of 100-130 DEG C and the rotation rate of 60-100 revolutions / h for 1-2 hours, thereby obtaining the biomass charcoal by reaction. According to the invention, not only is the difficulty of processing organic waste is solved, but also charcoal making with low cost is realized, wherein the cost is only 10%-15% of that of ordinary high-temperature charcoal making, and furthermore, the biomass charcoal has large specific surface area and good adsorption performance, can be widely applied to adsorption and purification in sewage treatment and has good economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of preparing biomass charcoal from organic waste, in particular to a method for preparing biochar from organic waste by sulfonated carbon catalyzed at low temperature, including a preparation method of a sulfonated carbon catalyst. Background technique [0002] At present, organic waste is mainly treated by landfill, composting, incineration, etc., which not only has high processing costs, but also does not fully utilize the resource utilization value of organic waste, and may cause secondary pollution during the treatment process. For example, livestock manure is usually used for composting or anaerobic biogas production; agricultural waste and garden waste have always been incinerated due to their large area, but the incineration process will pollute the air. Therefore, the current utilization methods include gasification, Biomass briquettes and high-temperature bio-carbon soil amendments; while the treatm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/18C10B53/00C10B53/02C10B57/14
CPCB01J21/18C10B53/00C10B53/02C10B57/14Y02E50/10
Inventor 马伟芳张伟锋董志刚
Owner 天津滨海道顺科技发展有限公司
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