Malic acid and KMnO4-based combined and modified cow dung biogas residue hydrochar preparation method

Patent metadata

Field	Value
Publication number	US-11235305-B2
Application number	US-201816485114-A
Country	US
Kind code	B2
Filing date	Jul 2, 2018
Priority date	Dec 1, 2017
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

A malic acid and KMnO4-based combined and modified cow dung biogas residue hydrochar preparation method, comprising: mixing a cow dung biogas residue with malic acid, and performing ultrasonic treatment to obtain a malic acid modified cow dung biogas residue; performing a hydrothermal reaction with KMnO4 in a high-temperature high-pressure reactor to obtain a combined and modified cow dung biogas residue hydrochar material.

First claim

The invention claimed is:

1. A method for preparing hydrothermal carbon based on malic acid and KMnO 4 combined modified cow dung biogas residue, comprising the following steps:
1) mixing cow dung biogas residue and malic acid solution homogeneously and then performing ultrasonic treatment, to obtain malic acid modified cow dung biogas residue;
2) adding KMnO 4 solution to the malic acid modified cow dung biogas residue obtained in the step 1), mixing homogenously and then performing a hydrothermal reaction, to obtain the hydrothermal carbon based on cow dung biogas residue;
wherein, the filling degree of reactor of hydrothermal reaction is 60%˜80%.

2. The method for preparing hydrothermal carbon based on malic acid and KMnO 4 combined modified cow dung biogas residue according to claim 1 , wherein, the cow dung biogas residue has 7%˜10% moisture content and is filtered through a 20-mesh screen in the step 1).

3. The method for preparing hydrothermal carbon based on malic acid and KMnO 4 combined modified cow dung biogas residue according to claim 1 , wherein, the ultrasonic treatment is performed at 35˜85° C., 40 KHz and 100 W for 40˜90 min.

4. The method for preparing hydrothermal carbon based on malic acid and KMnO 4 combined modified cow dung biogas residue according to claim 1 , wherein, the concentration of the malic acid solution is 0.5˜1.0 mol·L −1 , and the solid to liquid ratio of the cow dung biogas residue to the malic acid is 1:6˜1:10.

5. The method for preparing hydrothermal carbon based on malic acid and KMnO 4 combined modified cow dung biogas residue according to claim 1 , wherein, the concentration of the KMnO 4 solution is 0.13˜0.25 mol·L −1 , and the solid to liquid ratio of the malic acid modified cow dung biogas residue to the KMnO 4 solution is 1:5˜1:10.

6. The method for preparing hydrothermal carbon based on malic acid and KMnO 4 combined modified cow dung biogas residue according to claim 1 , wherein, the reaction temperature of the hydrothermal reaction is 180˜220° C., the reaction time is 2˜3 h, and the heating rate is 1˜5° C.·min −1 .

Assignees

• Jiangsu Acad Agricultural Sci

Inventors

• Jin Hongmei
• Zhu Ning
• Xi Yonglan
• Sun Enhui
• Du Jing
• Huang Hongying
• Ye Xiaomei
• Zheng Mengjie
• Li Danyang

Classifications

• B01J20/3078 Primary

  Thermal treatment, e.g. calcining or pyrolizing · CPC title

• B01J20/20 Primary

  comprising free carbon; comprising carbon obtained by carbonising processes · CPC title

• C01B32/05

  Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30 · CPC title

• C02F2101/16

  Nitrogen compounds, e.g. ammonia · CPC title

• C02F1/283

  using coal, charred products, or inorganic mixtures containing them · CPC title