METHOD OF SWITCHING BETWEEN CATALYSTS BASED ON ZIELGLER-NATTA SYSTEM AND BASED ON CHROME Russian patent published in 2009 - IPC C08F2/42 C08F6/02 C08F10/00 

FIELD: chemistry.

SUBSTANCE: description is given of a method of switching in an olefin polymerisation reactor from a first catalyst to a second catalyst (versions), including addition of a deactivator (DA) into the said reactor; addition of a cocatalyst adsorbent (CAA) into the said reactor, containing an inorganic oxide, which is aluminium oxide or its mixture with silicon dioxide; where the inorganic oxide is dehydrated at temperature of at least 200°C; and where the above mentioned CAA does not contain transition metals. Describe also is a method of switching in an olefin polymerisation reactor from a first catalyst to a second catalyst, including addition of additives, which enable switching (TAA), where TAA is chosen from one representative of a group, consisting of alkoxylated amines, alkoxylated amides, oleic acid or their combinations, where the first catalyst contains at least, one Ziegler-Natta catalyst, including the above mentioned catalyst, cocatalyst and, optionally, a carrier. The above mentioned second catalyst contains at least, one chrome based catalyst. Description is given of a method of switching in an olefin polymerisation reactor from the first catalyst to the second catalyst, including initial addition of an organo-metal compound, described by the formula: BR₃ or AlR_(3-a)X_a, where R is hydrogen, branched or straight alkyl, cycloalkyl, heterocycloalkyl, aryl radical, containing 1 to 30 carbon atoms, X is a halogen, and a equals 0, 1 or 2, to a cocatalyst adsorbent (CAA); after that CAA together with the organo-metal compound are added into the reactor; where CAA contains an inorganic oxide, dehydrated at temperature of at least 200°C, and intrinsically does not contain transition metals.

EFFECT: realising a method of switching between incompatible catalysts without need for stopping the polymerisation reaction, evacuation of the reactor, and after that, repeated launching of the reactor using another catalyst system; reduction of the amount of substandard material, obtained during the operation; cutting on duration of the operation.

30 cl, 14 dwg, 1 tbl, 20 ex