Post-processing method for polypropylene powder

A polypropylene powder and 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 process and equipment

Active Publication Date: 2012-05-16
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-

Method used

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  • Post-processing method for polypropylene powder
  • Post-processing method for polypropylene powder
  • Post-processing method for polypropylene powder

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[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...

Example Embodiment

[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 gas / solid separation of the polymer leaving the polymerization tank, 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 combined action of heating, stirring, and water vapor replacement, hydrocarbons (volatile matter) escape from the powder ...

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Abstract

The invention provides a post-processing method for polypropylene powder, which belongs to the petroleum chemical field. In the polypropylene post-processing method of the prior art, the method comprises the following steps: polypropylene powder which departs from a polymerization system and is carried out preliminary gas/solid separation enters into a drier, indirectly heated through steam and nitrogen is introduced, hydrocarbons can be removed in powder and then enters in a steamer, nitrogen and water vapor are introduced for inactivation of a catalyst; or the polypropylene powder which departs from a polymerization system and is carried out preliminary gas/solid separation enters into a degassing chamber, water vapor-containing nitrogen is introduced in the degassing chamber; the present invention modifies the prior art. The post-processing method of the invention comprises the following steps: introducing water vapor, modifying the drier to a steam drier used for recovering hydrocarbons and inactivating the catalyst, introducing a hydrocarbons-removed polymer in the steam drier (or a degassing chamber), adding nitrogen without water vapor in the steam drier, modifying the steam drier to a moisture eliminator used for removing water vapor in powder. The method of the invention is capable of thoroughly recovering hydrocarbons which depart from the polymerization system by an economic method, reducing the unit consumption and energy consumption, and thoroughly solving the problem on 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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IPC IPC(8): C08F10/06C08F6/28
CPCB29B9/16B29B2009/168B29B7/826B29B7/86B29B7/16B29B7/7461B29B7/748
Inventor 高煦
Owner 高煦
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