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Process for the polymerization of olefins

A technology of olefin homopolymerization and olefin, which is applied in the field of olefin polymerization technology, and can solve problems such as increasing corrosion and changing polymer properties

Active Publication Date: 2019-06-07
BASSELL POLIOLEFINE ITAL SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although catalyst activity can indeed be improved, there are several possible disadvantages of adding chlorinated chemicals to the polymerization reactor; the most important being increased corrosion and altered polymer properties due to interaction with the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-2 and comparative example 1

[0048] Preparation process of solid catalyst component (A)

[0049] A magnesium chloride and alcohol adduct containing about 3 moles of alcohol was prepared as described in Example 2 of USP 4,399,054, but operated at 2000 RPM instead of 10000 RPM. The adduct is heat treated in the temperature range of 50-150° C. under nitrogen flow until an alcohol content of 25% by weight is reached.

[0050] In a nitrogen-purged 2 L four-neck round bottom flask, introduce 1 L of TiCl at 0 °C 4 . Then, at the same temperature, 70 g of spherical MgCl containing 25% wt ethanol and prepared as described above was added under stirring 2 / EtOH adduct. The temperature was raised to 140° C. within 2 h and held for 120 min. Then, stirring was stopped, the solid product was allowed to settle, and the supernatant was siphoned off. The solid residue was then washed once with heptane at 80°C and five times with hexane at 25°C and dried under vacuum at 30°C.

[0051] At 260cm with agitator 3 In a g...

Embodiment 1

[0056] Embodiment 1 polymerization process

[0057] The polymerization process is carried out in a continuously working plant and is equipped with a stirred vessel (precontact tank) in which the catalyst components are mixed to form a catalytic system, and a fluidized bed reactor (polymerization reactor) kept under fluidized conditions, propane Receive the catalyst mixture from the stirred vessel.

[0058] The following reactants were fed to the precontact tank and maintained at a temperature of 50 °C:

[0059] · Solid catalyst component (28 g / h) prepared as described above

[0060] ・Liquid propane as diluent, containing 100ppm H 2 (0.2Kg / h)

[0061] ·TIBA / DEAC solution (140Kg / h)

[0062] Tetrahydrofuran (THF) solution (2Kg / h) as external donor

[0063] The catalytic system thus obtained was passed through a solution containing 100 ppm H 2 Liquid propane (at a rate of 0.2 Kg / h) was fed into the gas phase fluidized bed reactor from the precontact section together with the...

Embodiment 2

[0065] According to the same process as in Example 1, the difference is to use a solution containing 300ppm H 2 of liquid propane.

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Abstract

A gas-phase process for the homo or copolymerization of olefins carried out in the presence of a catalyst system formed by a contacting in a liquid hydrocarbon and in the presence of hydrogen (a) a solid catalyst component comprising a Ti, Mg and C1, and optionally an internal electron donor compound, (b) an aluminum alkyl compound and optionally (c) an external donor compound.

Description

technical field [0001] The present invention relates to a gas phase process for the polymerization of olefins, especially ethylene and its combination with olefins CH 2 = a mixture of CHR, wherein R is an alkyl, cycloalkyl or aryl group having 1 to 12 carbon atoms, in the presence of a catalyst system comprising (a) comprising Ti, Mg, halogen and optionally The solid catalyst component of the electron donor, and (b) the alkylaluminum compound, are contacted with a specific and particular sequence of steps. Background technique [0002] Gas phase polymerization is one of the most widely used techniques for the preparation of polyethylene, which can be carried out in a fluidized or stirred bed reactor in the presence of a suitable catalyst, ethylene, a fluidizing gas and a molecular weight regulator (usually consisting of hydrogen) in progress. Ziegler-Natta catalysts are commonly used for this type of polymerization. [0003] Gas-phase ethylene polymerization activity is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/02C08F2/34C08F4/654C08F4/649
CPCC08F110/02C08F2400/02C08F2500/12C08F2500/18C08F4/6543C08F2/34C08F110/06C08F4/6492C08F10/02
Inventor P·巴伊塔M·考瓦茨M·迪迭戈L·马尔特尤拉诺A·马祖科G·梅伊R·皮卡
Owner BASSELL POLIOLEFINE ITAL SRL