Method for producing olefin polymer
A method for producing an olefin polymer, in which an olefin compound is polymerized in the presence of a Lewis acid catalyst at a temperature of 0° C. or lower to obtain an olefin polymer, the method comprising a step of feeding a raw material liquid including the olefin compound to a reactor provided with a cooling unit, a step of polymerizing the olefin compound in the reactor to obtain a reaction liquid including the olefin polymer, a deactivation step of adding a deactivator to the reaction liquid taken out from the reactor to deactivate the Lewis acid catalyst, and a step of supplying the reaction liquid after the deactivation step to a cold recovery unit to recover cold from the reaction liquid, wherein the amount of the Lewis acid catalyst is 0.5×10 −3 to 1.0×10 −1 mol % based on the total amount of the olefin compound.
1. A method for producing an olefin polymer, in which an olefin compound is polymerized in the presence of a Lewis acid catalyst at a temperature of 0° C. or lower to obtain an olefin polymer, the method comprising:
a feeding step of feeding a raw material liquid including the olefin compound to a reactor provided with a cooling unit;
a polymerization step of polymerizing the olefin compound in the reactor to obtain a reaction liquid including the olefin polymer;
a deactivation step of adding a deactivator to the reaction liquid taken out from the reactor to deactivate the Lewis acid catalyst; and
a cold recovery step of supplying the reaction liquid after the deactivation step to a cold recovery unit to recover cold from the reaction liquid,
wherein an amount of the Lewis acid catalyst is 0.5×10 −3 to 1.0×10 −1 mol % based on a total amount of the olefin compound.
2. The method according to claim 1 , wherein the Lewis acid catalyst is an aluminum compound represented by the following formula (1) or (2):
Al(R) m (X) (3-m) (1)
Al 2 (R) n (X) (6-m) (2)
wherein R represents an alkyl group having 1 to 8 carbon atoms, X represents a halogen atom, m represents 1 or 2, and n represents any integer of 1 to 5.
3. The method according to claim 1 , wherein the amount of the Lewis acid catalyst is 0.5×10 −3 to 0.3×10 −2 mol % based on the total amount of the olefin compound.
4. The method according to claim 1 , wherein the raw material liquid to be fed to the reactor is cooled in advance by the cold recovered in the cold recovery unit.
5. The method according to claim 1 , wherein the olefin compound includes isobutene.
6. The method according to claim 1 , wherein the deactivator includes water or an alcohol compound.