DE433524C - Active coal production - Google Patents

Description

Active coal production. Active carbons can be made in a number of ways, but most of them produce relatively expensive products. It has been found that the production price can be significantly cheaper and yet beneficial substances can be obtained if brown or hard coals are treated with extraction agents which dissolve the bitumen as completely as possible and, after extraction, the products obtained with or without the addition of potassium compounds are known Way heated to high temperatures with the exclusion of air. The hydrogenated kaphthalenes, in particular tetralin, prove to be particularly suitable as extraction agents when higher temperatures and pressures are used. This procedure leads to the use of very cheap starting materials and cheap active carbons, which, if suitable starting materials are used, can also have a considerably high bulk density.

Example 1. Bitumen-rich coal is mixed with tetralin at 22o ° im Pressure vessel largely extracted, the extraction being repeated as often as long significant amounts of extract can still be formed. The product obtained is from Tetralin largely freed by heating, expediently in vacuo, and then at iooo ° longer time in the absence of oxygen or lack of oxygen with or heated without the addition of potassium carbonate. The products obtained show after Leaching out water-soluble salts has a good adsorptive power.

Claims (1)

PATENT CLAIM: Process for the production of active charcoal from brown or hard coal, characterized in that this coal is extracted with Subjected to hydrogenated naphthalenes and then after separation of the extractant at about 100 °, if necessary with the addition of potassium compounds, glows.