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Process for converting biomass to coal-like material using hydrothermal carbonisation

Inactive Publication Date: 2011-03-10
CARBON SOLUTIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Owing to the temperatures close to the critical range which are used in the U.S. patent application, the process is complex and requires elaborate and thus expensive equipment to be carried out with safety.

Method used

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  • Process for converting biomass to coal-like material using hydrothermal carbonisation
  • Process for converting biomass to coal-like material using hydrothermal carbonisation

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0076]6.0 g glucose is dissolved in 24.0 g water, and citric acid is added to adjust the pH to 5. A 40 ml stainless steel autoclave is charged with the mixture and heated to 230° C. for 5 min. After cooling, the autoclave is opened, and 30 mg benzoyl peroxide is added under stirring. Then, the autoclave is sealed again, and heated to 180° C. After 90 min, the reaction is terminated by quenching. 2.9 g of hydrothermal coal containing 64 wt % carbon is obtained. The calorific value of the coal is 26 kJ / g.

example 2

[0077]200 g wood flour (sawdust) and 600 g water are formed into a slurry, and phosphoric acid is added to adjust the pH to 4. A 1 l stainless steel autoclave (manufactured by Paar, Germany), equipped with an internal thermoelement, is charged with the mixture and heated to 250° C. After exceeding the internal temperature of 240° C., the reaction is quenched after 10 min. Subsequently, 100 mg FeCl3.6 H2O and 200 mg 30% aqueous H2O2 are added at a temperature of about 100° C. The reaction mixture is heated again to 195° C., and further reacted for 3 h. After cooling and opening the autoclave, the product is separated into a solid phase (containing the hydrothermal coal) and a liquid phase. There is obtained 76 g of hydrothermal coal which contains 68 wt % carbon and can be pulverized by hand. The calorific value of the coal is 25 kJ / g.

example 3

[0078]The liquid phase separated from the reaction mixture in Example 2, while still warm (60° C.), is bubbled with air to obtain an oxidized liquid phase. Then, Example 2 is repeated except for using 200 ml of the thus-obtained oxidized liquid phase in place of the FeCl3.6 H2O and H2O2. A product is obtained which is, within the measurement accuracy, the same as that obtained in Example 2.

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Abstract

The present invention relates to a hydro thermal carbonization process for the preparation of coal-like material using biomass. The process comprises a step (i) of heating a reaction mixture comprising water and biomass to obtain a reaction mixture comprising activated biomass; and a step (ii) of adding a polymerization initiator to the reaction mixture obtained in step (i) to polymerize the activated biomass and to obtain a reaction mixture comprising coal-like material. The process is beneficial in terms of product control, and process engineering.

Description

FIELD OF THE INVENTION[0001]The present invention relates generally to a process for the preparation of coal-like material from biomass, more particularly to an improved and quicker process yielding the coal-like material in enhanced space-time yield, and which, moreover, allows for enhanced quality control of the final product, as well as improved reproducibility. Also, the process of the invention is cheaper in terms of the necessary equipment, and it is a very safe process.BACKGROUND[0002]In the past, many efforts have been made to imitate the natural coalification of biomass, which takes place on a time scale of some hundred (peat) to hundred million (black coal) years. Besides the formation of charcoal by pyrolysis of dry biomass, the so-called hydrothermal carbonization (HTC) process for the manufacture of coal or coal-like materials has recently attracted increasing attention. The first experiments were carried out already in 1913 by Bergius, who described the hydrothermal tr...

Claims

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Application Information

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IPC IPC(8): C10L5/44
CPCC10B53/02C10L5/44C10L9/00Y02E50/30C10L9/086Y02E50/10Y02E50/14C10L9/02Y02P20/145
Inventor ANTONIETTI, MARKUS
Owner CARBON SOLUTIONS
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