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Method for improving yield of ecological carbon

A technology of ecological carbon and carbonization, applied in the fields of nanotechnology, nanostructure manufacturing, nanotechnology, etc., can solve the problems of restricting large-scale industrial application, unsuitable biomass, and low yield of ecological carbon.

Inactive Publication Date: 2010-07-14
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some scientists at home and abroad have prepared activated carbon, carbon molecular sieve and other ecological carbon by using it as raw material, but the yield of the obtained ecological carbon is low, which seriously restricts its large-scale industrial application
Mechanically pressurizing the pulverized biomass raw materials within a certain temperature range can increase the yield of ecological charcoal, but this method is not suitable for hard biomass that is difficult to pulverize, so research and develop a method that is suitable for all biomass Applicable yield improvement technology is very necessary

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] With less than 10 mesh corn stalks (belonging to soft biomass) as raw material (carbon 45.52wt%, hydrogen 6.23wt%, nitrogen 0.88wt%, oxygen 47.37wt%), raw material is 6g, sulfuric acid concentration is 10%, sulfuric acid consumption In the case of 90mL, soak for 10h, then place the soaked sample in a drying oven at 120°C, dry it for 6h, and then take it out. Carbonization was carried out at a carbonization temperature of 800°C and a carbonization time of 30 minutes, and the carbonization yield increased from 18.15% before sulfuric acid immersion to 30.19% after immersion. The activation temperature is 800°C, the water vapor flow rate of the activator is 0.25mL / min, N 2 Activation is carried out at a flow rate of 50mL / min. If the activation yield is calculated as 50%, the total yield of ecological charcoal reaches 15.10%, much higher than 9.08% without sulfuric acid soaking.

Embodiment 2

[0014] With less than 20 mesh wheat straw (belonging to soft biomass) as raw material (carbon 49.23wt%, hydrogen 6.87wt%, nitrogen 1.24wt%, oxygen 42.66wt%), raw material is 6g, sulfuric acid concentration is 20%, sulfuric acid consumption is In the case of 90mL, the soaking time is 5h, and then the soaked sample is placed in a drying oven at 120°C, dried for 6h and taken out. Carbonization was carried out at a carbonization temperature of 800°C and a carbonization time of 30 minutes, and the carbonization yield increased from 30.54% before sulfuric acid immersion to 34.88% after immersion. The activation temperature is 800°C, the water vapor flow rate of the activator is 0.25mL / min, N 2 Activation is carried out at a flow rate of 50mL / min. If the activation yield is calculated as 50%, the total yield of eco-char is 17.44%, which is higher than 15.27% without soaking in sulfuric acid.

Embodiment 3

[0016] With less than 20 mesh corn cobs (belonging to soft biomass) as raw material (carbon 46.90wt%, hydrogen 6.41wt%, nitrogen 0.91wt%, oxygen 45.78wt%), raw material is 6g, sulfuric acid concentration is 20%, sulfuric acid consumption In the case of 90mL, soak for 5h, then place the soaked sample in a drying oven at 120°C, dry for 6h, and then take it out. Carbonization was carried out at a carbonization temperature of 800°C and a carbonization time of 30 minutes, and the carbonization yield increased from 18.52% before sulfuric acid immersion to 32.64% after immersion. The activation temperature is 800°C, the water vapor flow rate of the activator is 0.25mL / min, N 2 Activation is carried out at a flow rate of 50mL / min. If the activation yield is calculated as 50%, the total yield of ecological charcoal reaches 16.32%, which is much higher than 9.26% without soaking in sulfuric acid.

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Abstract

The invention provides a method for improving the yield of ecological carbon, belonging to the category of novel material synthesis and processing engineering technology and the cross technical field of nanometer material, carbon material, cellulose science and renewable energy source. The method is characterized in that before the carbonization process, the biomass substance is processed through sulfuric acid, that is, the biomass substance is immersed in sulfuric acid at certain concentration so as to improve the yield of the ecological carbon. The invention has the effects and benefits that the materials are cheap in price, the production process is simple and is suitable for all biomass substances, and the ecological carbon prepared through the method is high in yield, low in ash content and wide in application range.

Description

technical field [0001] The invention relates to a method for increasing the yield of ecological charcoal, and belongs to the cross technical fields of nanometer materials, carbon materials, cellulose science and renewable energy. It mainly involves a technical method for preparing high-yield ecological charcoal by using biomass as raw material and soaking in sulfuric acid. Background technique [0002] Biomass is a clean and renewable resource. The total amount of biomass produced on the earth is about 140-180 billion tons per year, which is equivalent to 10 times the current total annual energy consumption in the world. As a large agricultural country, China is rich in biomass and its waste resources. For a long time, biomass waste has been mainly used as household fuel, animal feed or buried in the ground as fertilizer, or even burned directly, which has a low calorific value utilization rate and pollutes the environment. Recently, there have been reports about the use o...

Claims

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Application Information

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IPC IPC(8): C01B31/02B82B3/00
Inventor 吴明铂张玉贞卢水根郭宁李士斌李扬郭燕生侯宝花李兆丰宋长刚查庆芳
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)