Post-processing method of polypropylene powder

A polypropylene powder and polymer powder technology, applied in the petrochemical field, can solve problems such as reducing unit consumption, and achieve the effects of reducing unit consumption, reducing floor space, and simplifying processes and equipment

Active Publication Date: 2016-05-25
高煦
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But still can not completely solve the problem of reducing unit consumption
Owing to not feeding nitrogen in the drier, the hydrocarbons carried when the polypropylene powder enters the steamer by the drier are compared with Japanese Patent Laid-Open No. 58-157807, No. 56-139520 (Mitsui Oil & Chemical) when passing nitrogen in the drier. When the dryer enters the steamer, it carries more hydrocarbons, which brings environmental problems when the exhaust gas of the steamer is discharged.

Method used

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  • Post-processing method of polypropylene powder
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: as attached figure 1 As shown, the steam dryer 11 is a powder material heater (paddle dryer) that feeds direct steam, the operating pressure is 0.006Mpag, and the heating area is 70 square meters. 12 is a stirring shaft, and 13 is a stirring paddle. After the gas / solid separation of the polymer leaving the polymerization tank, the polypropylene powder 100 entering the steam dryer 11 is 4000kg / hr, and the hydrocarbons carried are about 100kg / hr. The direct water vapor passed into the steam dryer 11 101 is 100kg / hr. The heating steam enters the jacket of 11 through 104, and the steam condensate leaves the jacket of 11 through 105. The inside of 12 and 13 can pass into heating steam, discharge steam condensate (not represented on the figure). The polypropylene powder is heated to 105°C in the steam dryer 11. Under the joint action of heating, stirring and water vapor replacement, hydrocarbons (volatile matter) escape from the powder and are recovered by 10...

Embodiment 2

[0029] Embodiment 2: as attached figure 2 as shown,

[0030] The steam dryer 21 is a powder material heater (paddle dryer) that feeds direct steam, the operating pressure is 0.006Mpag, and the heating area is 70 square meters. 22 is a stirring shaft, and 23 is a stirring blade. After the polymer leaving the polymerization tank undergoes gas / solid separation, the polypropylene powder 200 entering the steam dryer 21 is 4000kg / hr, and the hydrocarbons carried are about 100kg / hr. The direct water vapor passed into the steam dryer 21 201 is 100kg / hr. The heating steam enters the jacket of 21 through 204 , and the steam condensate leaves the jacket of 21 through 205 . The inside of 22 and 23 can pass into heating steam, discharge steam condensate (not represented on the figure). The polypropylene powder is heated to 105° C. in the steam dryer 21 , and under the joint action of heating, stirring, and water vapor replacement, hydrocarbons (volatile matter) escape from the powder ...

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Abstract

The invention discloses a post-treatment method for polypropylene powder, which belongs to the field of petrochemical industry. For the existing polypropylene post-treatment process, "the polypropylene powder that leaves the polymerization system and undergoes preliminary gas / solid separation or enters the dryer, is indirectly heated by steam and nitrogen, removes hydrocarbons in the powder, and then enters the steam Nitrogen and water vapor are passed into the steamer to deactivate the catalyst; or enter the degassing chamber, and nitrogen containing water vapor is passed into the degassing chamber to improve: instead of passing nitrogen into the dryer, water vapor is passed into the dryer, and the It is transformed into a steam dryer that recovers hydrocarbons and deactivates the catalyst. The polymer after removing hydrocarbons enters the steamer (or degassing chamber, the same below), and nitrogen without water vapor is added into the steamer to deactivate the steam. The steamer is transformed into a dehumidifier for removing water vapor in the powder. The invention can completely recover the hydrocarbons leaving the polymerization system in an economical way, reduce unit consumption and energy consumption, and completely solve the problem of environmental protection.

Description

technical field [0001] The invention belongs to the field of petrochemical industry. Background technique [0002] The content of the present invention relates to a method for deactivating, removing and economically recovering the hydrocarbons carried in the powder in the process of producing polypropylene, the residual catalyst in the polypropylene powder after leaving the polymerization reactor. [0003] As we all know, after the synthesis of polypropylene, the polypropylene powder leaving the polymerization system carries a certain amount of hydrocarbons, some of which are dissolved in the polymer and some are free. The purpose of post-treatment of polypropylene powder is to remove these The carried hydrocarbons are removed, and at the same time, the residual catalyst (including catalyst and aluminum alkyl) in the powder is deactivated. The above process of removing hydrocarbons is generally called degassing or devolatilization (or drying), and the process of decomposing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/06C08F6/28
CPCB29B9/16B29B2009/168B29B7/826B29B7/86B29B7/16B29B7/7461B29B7/748
Inventor 高煦
Owner 高煦
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