Method for Producing an Odor-Free HTC Coal and Odor-Free HTC Coal

Abstract

A method for producing an odor-free HTC coal, at least comprising the following steps: a) providing a biomass; b) performing a hydrothermal carbonization in order to produce a carbon sludge, the carbon sludge comprising HTC coal and HTC process water; c) separating HTC coal and HTC process water by a mechanical dewatering process; d) heating the HTC coal to a temperature of at least 150 degrees Celsius in order to remove highly volatile carbon compounds.

Claims

1. A process for producing an HTC carbon, at least comprising the following steps: a) providing a biomass; b) performing a hydrothermal carbonization to produce a carbon sludge; where said carbon sludge comprises HTC carbon and HTC process water; c) separating HTC carbon and HTC process water by a mechanical dewatering operation; d) heating the HTC carbon for removal of volatile carbon compounds to a temperature of at least 150 degrees Celsius.

2. The process as claimed in claim 1, wherein more than 3% by weight of the dry matter is volatilized in step d).

3. The process as claimed in claim 1, wherein not more than 18% by weight of the dry matter is volatilized in step d).

4. The process as claimed in claim 1, wherein step d) is effected at a temperature of not more than 350 degrees Celsius.

5. The process as claimed in claim 1, wherein step d) is performed at an ambient pressure and without protective gas.

6. The process as claimed in claim 1, wherein step b) is performed at a temperature between 170 to 250 degrees Celsius, with exclusion of air and at a pressure of 5 to 40 megapascals.

7. The process as claimed in claim 1, wherein step d) is followed by coloring of the HTC carbon.

8. An HTC carbon, wherein the HTC carbon at an ambient pressure and 20 degrees Celsius is odorless with respect to volatile carbon compounds.

9. The HTC carbon as claimed in claim 8, wherein the HTC carbon has a color atypical of HTC carbon.

10. A use of an HTC carbon as claimed in claim 8 as ground cover material or fertilizer.

Description

[0038] FIG. 1 shows the sequence of a process for preparing an odorless HTC carbon 1.

[0039] In step a), a biomass 2 is provided. In step b), a hydrothermal carbonization 3 for production of a carbon sludge 4 is conducted. The carbon sludge 4 comprises an HTC carbon 1 and an HTC process water 5. In the subsequent step c), HTC carbon 1 and HTC process water 5 are separated from one another by a mechanical dewatering operation. In step d), the HTC carbon 1 is heated to a temperature of at least 150 degrees Celsius for removal of volatile carbon compounds 6. In this step, more than 3% by weight of the dry matter of HTC carbon 1 is volatilized.

LIST OF REFERENCE NUMERALS

[0040] 1 HTC carbon [0041] 2 biomass [0042] 3 hydrothermal carbonization [0043] 4 carbon sludge [0044] 5 HTC process water [0045] 6 volatile carbon compounds