Method for producing α-olefin
A method may produce an α-olefin and may include: (1) continuously introducing an ethylene and a catalyst into a reactor, then mixing and polymerizing to obtain a reaction mixture; (2) continuously separating the reaction mixture into a gas A and a liquid B in a flasher having a separation drop size d L of formula (1) of 1.0×10 −4 m or less: d L = 18 μ v g ( ρ L - ρ V ) , ( 1 ) v being rising speed (m/s) of a gas in the flasher, ρ V being density (kg/m 3 ) of the gas A, ρ L being density (kg/m 3 ) of the liquid B, g being gravitational acceleration (m/s 2 ), and μ being viscosity (Pa·s) of the gas A; (3) bringing the gas A into contact with a solvent in a scrubber to obtain a gas C containing an unreacted ethylene and a liquid D containing the solvent; and (4) reusing the gas C in a polymerization.
1 . A method for producing an α-olefin, the method comprising:
(1) continuously introducing an ethylene and a catalyst into a reactor, followed by mixing and polymerizing to obtain a reaction mixture;
(2) continuously separating the reaction mixture into a gas A and a liquid B in a flasher having a separation drop size d L of formula (1) below of 1.0×10 −4 m or less:
d
L
=
18
μ
v
g
(
ρ
L
-
ρ
V
)
,
(
1
)
v being rising speed of a gas in the flasher in m/s, ρ V being density of the gas A in kg/m 3 , ρ L being density of the liquid B in kg/m 3 , g being gravitational acceleration in m/s 2 , and μ being viscosity of the gas A in Pa·s;
(3) bringing the gas A into contact with a solvent in a scrubber to obtain a gas C comprising an unreacted ethylene and a liquid D comprising the solvent; and
(4) reusing the gas C in a polymerization reaction.
2 . The method of claim 1 , wherein the scrubber is a plate type scrubber.
3 . The method of claim 1 , wherein the scrubber is a bubble tower type scrubber.
4 . The method of claim 1 , wherein, in the bringing (3), a temperature of a liquid in the scrubber is kept at 100° C. or more.
5 . The method of claim 1 , wherein the liquid D obtained in the the bringing (3) is fed to the flasher.
6 . The method of claim 1 ,
wherein the continuously separating (2) comprises continuously separating the reaction mixture into a gas A and a liquid B in a first flasher having a separation drop size d L of the formula (1) of 1.0×10 −4 m or less and then further continuously separating the liquid B into a gas E and a liquid F in a second flasher having a separation drop size d L of the formula (1) of 1.0×10 −4 m or less;
wherein the bringing (3) comprises (3-i) bringing the gas A into contact with a solvent in a first scrubber to obtain a gas C comprising an unreacted ethylene and a liquid D comprising the solvent and (3-ii) bringing the gas E into contact with a solvent in a second scrubber to obtain a gas G comprising an unreacted ethylene and a liquid H comprising the solvent; and
wherein the reusing (4) comprises reusing the gas C and the gas G in a polymerization reaction.
7 . The method of claim 6 , wherein the liquid H obtained in the bringing (3) is fed to the second flasher.