# US 11,027,255 B2 · Ethylene and alpha-olefin polymerization method

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- Number: US 11,027,255 B2
- Document ID: US11027255B2
- Status: Granted
- Kind: B2
- Application number: 16/674,303
- Filed: 2019-11-05
- Published: 2020-03-05
- Granted: 2021-06-08
- Earliest claimed: 2014-01-06
- Assignees: Daelim Industrial Co., Ltd.
- Applicants: Daelim Industrial Co., Ltd.
- Inventors: Jae Hoon Uhm; Jin Hun Ju; Hee Sun Bae; Joo Mi Yeo; Sah Mun Hong
- Web page: https://patentgrep.com/patent/US11027255B2

## CPC

- B01J 19/24: Stationary reactors without moving elements inside (B01J19/08, B01J19/26 take precedence; with stationary particles B01J8/02)
- B01D 3/06: Flash distillation
- B01D 3/143: {by two or more of a fractionation, separation or rectification step}
- C07C 2/02: by addition between unsaturated hydrocarbons
- C07C 2/04: by oligomerisation of well-defined unsaturated hydrocarbons without ring formation
- C07C 2/06: of alkenes, i.e. acyclic hydrocarbons having only one carbon-to-carbon double bond
- C07C 2/08: Catalytic processes
- C08F 10/02: Ethene
- C08F 10/06: Propene
- C08F 10/14: Monomers containing five or more carbon atoms
- C08F 210/02: Ethene
- C08F 210/06: Propene
- C08F 210/16: Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
- C08F 210/18: with non-conjugated dienes, e.g. EPT rubbers
- B01J 2219/24: Stationary reactors without moving elements inside
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

Disclosed is a method for polymerization that copolymerizes ethylene and alpha-olefin. The method includes the steps of: copolymerizing ethylene and alpha-olefin of reaction raw materials in presence of solvents, to produce a polymerization product in which low molecular weight compounds containing unreacted ethylene and alpha-olefin, the solvents, ethylene and alpha-olefin copolymers and ethylene and alpha-olefin oligomers; separating the unreacted ethylene and alpha-olefin contained in the polymerization product by distilling; separating the solvents and the low molecular weight compounds having lower molecular weight than the ethylene and alpha-olefin copolymer and contained in the polymerization product by distilling, to obtain pure polymerization product; and separating the low molecular weight oligomers from the solvents and the low molecular weight compounds previously separated by distilling to recover the solvents, and then reusing the recovered solvents as solvents for polymerization.

## Claims

### Claim 1

A method for polymerizing ethylene and alpha-olefin, comprising the steps of:
copolymerizing ethylene and alpha-olefin in the presence of a solvent to produce a polymerization product which includes (i) the unreacted ethylene and alpha-olefin, (ii) the solvent, (iii) ethylene and alpha-olefin copolymers and (iv) ethylene and alpha-olefin oligomers;
separating (i) the unreacted ethylene and alpha-olefin from the polymerization product by distilling;
washing the polymerization product after separating (i) to inactivate a catalyst contained in the polymerization product;
separating (ii) the solvent and (iv) the ethylene and alpha-olefin oligomers which have lower molecular weight than (iii) the ethylene and alpha-olefin copolymer from the polymerization product by distilling to obtain (iii) the ethylene and alpha-olefin copolymer;
separating (iv) the ethylene and alpha-olefin oligomers by distilling from the separated (ii) the solvent and (iv) the ethylene and alpha-olefin oligomers to recover (ii) the solvent; and
reusing (ii) the recovered solvent as a solvent for the copolymerizing step of ethylene and alpha-olefin;
wherein number-average molecular weight of the ethylene and alpha-olefin copolymer is 500 to 10,000.

### Claim 2 (depends on 1)

The method of claim 1, wherein (i) the unreacted ethylene and alpha-olefin are separated by a flash-distillation.

### Claim 3 (depends on 1)

The method of claim 1, wherein the alpha-olefin is a linear alpha-olefin having 3 to 5 carbon atoms and the solvent is a saturated hydrocarbon compound having 4 to 8 carbon atoms.

### Claim 4 (depends on 1)

The method of claim 1, wherein the alpha-olefin is propylene.