METHOD OF PRODUCING PRECIPITATED CALCIUM CARBONATE, METHOD OF INCREASING CONTENT OF DRY SUBSTANCE OF PRECIPITATED CALCIUM CARBONATE PRODUCT AND REACTOR SYSTEM FOR PRODUCING PRECIPITATED CALCIUM CARBONATE Russian patent published in 2011 - IPC C01F11/18 C09C1/02 B01J8/22 

FIELD: chemistry.

SUBSTANCE: present inventions relate to a method of producing precipitated calcium carbonate (PCC) and the design of a low-power reactor system for realising the method such that, the amount of dry residues in the PCC product can be increased to 35% or more without a dehydration step. The disclosed method involves steps for bringing calcium hydroxide into contact with a carbon dioxide-containing gas in parallel or two or more separate reaction vessels in order to form calcium carbonate. Calcium oxide, lime or dry calcium hydroxide or a combination of any of the three components are also added to a portion of the obtained mixture of calcium hydroxide and calcium carbonate. When used in the production of PCC, the reactor system has at least one reactor vessel with an optional water inlet and gas inlet and at least one recirculation reservoir for inlet of components and optional water inlet.

EFFECT: use of the disclosed method and device ensure efficient and economical production of PCC with a given structure and high content of dry residues.

21 cl, 8 dwg, 9 ex