FIELD: technological processes.
SUBSTANCE: method for producing an ethylene polymer in the presence of Phillips chromium catalyst in a gas-phase polymerization reactor is presented. Reactor is equipped with a gas recycle pipe with a heat exchanger. Reactor gas is fed back to the polymerization reactor through a pipeline, where it partially condenses. Volume of liquid in the reactor gas fed back to the polymerization reactor is 0.5–10 % by weight. Polymerization is carried out at a temperature of 108–125 °C. Aluminum alkyl is fed to the polymerization reactor in an amount of 0.0025–0.1 mol per ton of ethylene.
EFFECT: increasing the productivity of the process, reducing the level of electrostatic charges in the polymerization reactor, improving the morphology of polyethylene powder with a low level of fine fractions and polymer gels.
12 cl, 1 tbl, 5 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHODS FOR CONTINUOUS GAS-PHASE POLYMERISATION | 2016 |
|
RU2692265C2 |
| METHOD OF POLYMERIZATION IN THE PRESENCE OF AN ADDITIVE, REDUCING STATISTICAL CHARGES | 2016 |
|
RU2653535C1 |
| GAS-PHASE METHOD OF PRODUCING ETHYLENE POLYMERS | 2019 |
|
RU2770427C1 |
| METHOD FOR POLYMERISATION OF OLEFINS IN A GAS-PHASE REACTOR, WHICH INCLUDES AN UPFLOW REACTOR AND A DOWNFLOW REACTOR | 2017 |
|
RU2703716C1 |
| METHOD FOR POLYMERIZATION OF OLEFINS IN A GAS-PHASE REACTOR WITH THREE OR MORE POLYMERIZATION ZONES | 2017 |
|
RU2709525C1 |
| METHOD FOR OLEFIN POLYMERIZATION IN A GAS PHASE | 2019 |
|
RU2743991C1 |
| POLYMERIZATION METHOD INVOLVING UNLOADING POLYOLEFIN PARTICLES FROM A GAS-PHASE POLYMERIZATION REACTOR | 2018 |
|
RU2730015C1 |
| METHOD OF GAS-PHASE FLUIDIZATION FOR PREPARING HOMO- AND COPOLYMERS OF ETHYLENE | 1998 |
|
RU2229479C2 |
| ADDITIVE FOR METHODS OF POLYOLEFIN POLYMERISATION | 2011 |
|
RU2577324C2 |
| INCREASING CONTINUITY ADDITIVE FOR OLEFINES POLYMERISATION PROCESSES | 2012 |
|
RU2632878C2 |
