The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 26, 2020
Filed:
Mar. 26, 2014
Papierfabrik August Koehler SE, Oberkirch, DE;
Heinrich Follmann, Berlin, DE;
Berit Hillbrecht, Dahlwitz-Hoppegarten, DE;
PAPIERFABRIK AUGUST KOEHLER SE, Oberkirch, DE;
Abstract
The invention relates to a particularly energy efficient, two-step method and to a system for the continuous or semicontinuous production of crystalline calcium carbonate (precipitated calcium carbonate, PCC) by reacting calcium hydroxide with CO, the calcium hydroxide being lime milk. In the first step of the germination, the CO-source is exclusively flue gas having a CO-content of between 4-25% <sb/><sb/>. In the second step, the complete conversion of the lime milk reacted in the first step to a maximum of 90%, preferably between 10-90%, is carried out exclusively using a rich gas which comprises 30-99% CO, preferably using biogas.