METHOD OF PREPARING NEODYMIUM-CARBOXYLATE COMPONENT OF DIENE HYDROCARBON POLYMERIZATION CATALYST Russian patent published in 2005 - IPC

FIELD: polymerization catalysts.

SUBSTANCE: invention, in particular, relates to synthetic rubber production and can be use in petrochemical industry. Invention proposes reaction of neodymium oxide or salt with C₈-C₂₀-carboxylic acid at acid-to-neodymium molar ratio between 2.2:1 and 5.0:1 in solvent and in presence of halogen-containing acid and/or Lewis acid at continuous stirring. Reaction proceeds directly upon dispersing and continuous renewal of reaction surface, milling surface ranging from 0.055 to 5.0 m² per 1 L reaction mixture volume. Above-mentioned dispersing and continuous renewal of reaction surface are performed both consecutively and simultaneously for 1.0-3.0 h and, if necessary, reaction mixture is recycled. When consecutively carrying out both processes, dispersing is effected until conversion 75-85% is attained, after which reaction of neodymium oxide or salt is completed at continuous renewal of reaction surface during 0.5-1.0 h.

EFFECT: increased conversion of neodymium oxide or salt to 100% and reduced losses of raw materials and power.

8 cl, 1 dwg, 11 ex