Method for preparing biomass hydrothermal coke from organic acid wastewater

A biomass and organic acid technology, applied in the field of biomass cleaning and utilization, can solve the problems of high energy consumption, complicated treatment process, large investment, etc., and achieve the effects of uniform pore distribution, strong heat absorption characteristics and high energy saving.

Active Publication Date: 2021-07-27
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the treatment process of organic acid wastewater is relatively complicated, with large investment and high energy consumption.
Therefore, simple and effective treatment methods for organic acid wastewater need to be developed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Fully mix 30 g of cotton waste with 300 g of formic acid-containing wastewater, stir for 5 minutes every 3 hours by a mixer with 50 rpm, and place it at room temperature for 12 hours to obtain a mixture, and the mixture is pulverized by a 5,000-rpm stirring pulverizer for 15 minutes to obtain a slurry; The slurry liquid is sent to the reaction kettle through the screw conveying equipment, the kettle body is sealed, and CO is introduced into the kettle 2 The air in the kettle was evacuated, then heated with an infrared heater with a wavelength of 5 μm, heated to a reaction temperature of 250 ° C and kept for 180 minutes, and the pressure was 4 MPa, so that the biomass was fully degraded and polycondensed. The cooling water is cooled to obtain a solid-liquid mixed product; the obtained solid-liquid mixed product is fed into a screw extrusion dehydrator with a power of 7KW and a rotational speed of 16 rpm for dehydration to obtain a dehydrated solid product, namely hydrothe...

Embodiment 2

[0042]30g of silk waste and 900g of acetic acid-containing waste water were fully mixed, stirred for 10 minutes every 5 hours by a mixer at 500 rpm, placed at room temperature for 24 hours to obtain a mixture, and the mixture was pulverized by a 10,000-rpm stirring pulverizer for 10 minutes to obtain a slurry; The slurry liquid is fed into the reaction kettle through the screw conveying equipment, the kettle body is sealed, and heated by an infrared heater with a wavelength of 5 μm. When heated to a reaction temperature of 300 °C, CO is introduced into the kettle. 2 The air in the kettle was evacuated, kept for 240 minutes, and the pressure was 9 MPa, so that the biomass was fully degraded and polycondensed. After the reaction was completed, it was immediately cooled by cooling water to obtain a solid-liquid mixed product; the obtained solid-liquid mixed product was fed into the power of A 10KW screw extrusion dehydrator with a rotational speed of 12 rpm is used for dehydration...

Embodiment 3

[0045] 30g of textile fiber waste and 600g of oxalic acid-containing waste water were fully mixed, stirred for 6 minutes every 4 hours by a mixer with 60 rpm, placed at room temperature for 18 hours to obtain a mixture, and the mixture was pulverized by a 6000-rpm stirring pulverizer for 12 minutes to obtain a slurry; The slurry liquid is fed into the reaction kettle through the screw conveying equipment, the kettle body is sealed, heated with an infrared heater with a wavelength of 10 μm, heated to a reaction temperature of 270 ° C, and maintained for 100 minutes, and CO is introduced into the kettle. 2 The air in the kettle was evacuated, and the temperature was kept for 100 minutes, and the pressure was 6 MPa, so that the biomass was fully degraded and polycondensed. After the reaction was completed, it was immediately cooled by cooling water to obtain a solid-liquid mixed product; the obtained solid-liquid mixed product was fed into the power The dehydration is carried out ...

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Abstract

The method of using organic acid wastewater to prepare biomass hydrothermal coke, according to the method, the biomass and organic acid wastewater are fully mixed in a mass ratio of 1:10 to 30, and every 3 to 5 hours at room temperature, after 50 ~ 500r/min mixer stirring for 5 ~ 10 minutes, after 12 ~ 24 hours, through 5000 ~ 10000r/min pulverizer treatment for 10 ~ 15 minutes, sent to the reaction kettle, and into the kettle into the CO 2 Evacuate the air, use infrared heating with a wavelength of 5-16 μm, the reaction temperature is 250-300 ° C, the reaction time is 180-240 minutes, and the pressure is at least the saturation pressure of water corresponding to the reaction temperature. After the reaction is completed, squeeze and separate , to obtain extremely low ash porous hydrothermal coke. The invention makes full use of the organic acid waste water to effectively remove the ash content of the biomass in the hydrothermal carbonization process, and simultaneously activates the hydrothermal coke, with simple process, low energy consumption and less emission.

Description

technical field [0001] The invention belongs to the field of biomass cleaning and utilization, and particularly relates to a method for preparing biomass hydrothermal coke by utilizing organic acid wastewater. Background technique [0002] my country is a big textile country, and the annual consumption of textile fibers is about 5 million tons. With the increase of textile fiber consumption, textile waste also increases. Strengthening the resource utilization of textile waste is not only of great significance to the ecological environment, but also of great value to the development of the textile industry and its waste treatment industry. [0003] Biomass hydrothermal carbonization technology can produce hydrothermal coke. The reaction conditions are mild, the process is simple and the treatment is quick. Alkaline (earth) metals (K, Na, Ca, Mg, etc.) are important components of biomass ash, which are extremely harmful in the process of biomass fuel thermochemical conversio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/00C02F11/00C02F11/125C10L5/46C10L5/40B01J20/20B01J20/30B09B3/00C02F101/30C02F101/20
CPCB01J20/20B09B3/00C02F1/00C02F11/00C02F11/125C02F2101/20C02F2101/30C10L5/40C10L5/46Y02E50/10Y02E50/30
Inventor 董向元郭淑青王红艳毕小龙王顺陈明
Owner NANJING INST OF TECH
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