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Olefin gas phase polymerisation

A gas-phase polymerization and polymer technology, which is applied in the field of olefin monomers, can solve problems such as difficult operation, and achieve the effect of improving catalyst activity

Active Publication Date: 2014-09-17
SAUDI BASIC IND CORP SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus, high levels of fines in the reactor can cause significant operational disturbances either within the reactor itself, or outside the reactor represented by piping, heat exchangers, compressors, and reactor inlet gas distribution grids. difficulty

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment V-VIII

[0113] Examples V-VIII and Comparative Example C

[0114] The polymerization of ethylene and 1-butene in a fluidized bed in dry mode was carried out according to the conditions disclosed in Example 10 of US4588790.

[0115] Comparing Comparative Example C and Example V, substituting greater than 60% of nitrogen with ethane in dry mode yields an increase in productivity of about 11% without affecting the dew point of the inlet recycle stream.

[0116] Comparing Comparative Example C and Example VI, by substituting about 50% of the nitrogen with ethane and using about 25% of isopentane as n-pentane, an increase in productivity of about 26% is obtained.

[0117] In Example VI, the use of about 68% isopentane (compared to Comparative Example C) resulted in a significant decrease in the dew point of the inlet recycle stream, which could lower the recycle stream inlet temperature to facilitate further increases in productivity.

[0118] Example VII shows an increase in productivity...

Embodiment IX-X and comparative Embodiment D

[0124] Ethylene and 1-butene in condensing mode were polymerized using a polymerization process in a fluidized bed according to the disclosure in Example 10.a in US4588790. Table 4 shows that when Comparative Example D is compared to Example IX and Example X, productivity increases of about 11% and 37%, respectively, are obtained.

[0125] Table 4

[0126]

[0127]

[0128] Examples XI-XIII and Comparative Example E

[0129] The polymerization of ethylene and 1-butene in condensation mode was carried out using a polymerization process in a fluidized bed according to the disclosure of Example 6.2 of US6759489B1.

[0130] When comparing Comparative Example E with Examples XI, XII and XIII, increases in productivity of about 16%, 21% and 16%, respectively, are obtained.

[0131] table 5

[0132]

[0133]

Embodiment XI

[0134] Examples XIV-XVI and Comparative Example F

[0135] The polymerization process in a fluidized bed to polymerize ethylene and 1-hexene in condensation mode was carried out according to the reaction conditions disclosed in Example 3 of WO99 / 06451.

[0136] Comparing Comparative Example F in Table 6 with Examples XIV, XV and XVI shows an increase in productivity of about 22%, 32% and 43%, respectively.

[0137] Table 6

[0138] Example

[0139] swelling accelerator)

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Abstract

The present invention relates to a process for the gas phase polymerization of one or more olefin monomers in a fluidized bed reactor in dry mode or in (super)condensed mode using a gas stream comprising an inert gas, characterized in that the inert gas comprises A mixture of the following inert components: (1) nitrogen; (2) gas heat capacity increaser; (3) adsorption promoter; and (4) polymer expansion agent. The inert gas may comprise (1) 5mol-60mol% nitrogen; (2) 10mol-90mol% ethane; (3) 1mol-50mol% n-butane; and (4) 0.1mol-10mol% n-pentane or isopentane alkyl.

Description

technical field [0001] The present invention relates to a process for the polymerization of olefin monomers, preferably ethylene monomers, in a gas phase polymerization process in a fluidized bed reactor. Background technique [0002] Olefin polymerization is a strongly exothermic reaction. Heat needs to be removed continuously in order to maintain the temperature in the reactor at the desired level. Such removal may be effected by the gaseous phase stream leaving the reactor at a higher temperature than that fed to the reactor. In gas phase polymerization reactions, heat removal from the growing polymer bed is often the rate limiting step. [0003] Conventionally, gas phase polymerization processes are typically run continuously, thus continuously removing The heat of polymerization thus controls the temperature of the fluidized bed reactor to a substantially isothermal level. When the temperature of the recycle stream introduced or recycled into the fluidized bed polym...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/00C08F2/34C08F10/08C08F10/14
CPCC08F2/34C08F10/00C08F210/16C08F210/14C08F210/08
Inventor Y·巴纳特F·阿尔-奥拜戴A·K·马利克
Owner SAUDI BASIC IND CORP SA
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