Material pipe jam preventing method in production of polypropylene block copolymer

A polypropylene block and copolymer technology, applied in the field of polyethylene-propylene block copolymer production technology, can solve problems such as blockage and expansion of the feeding system, and production cannot be carried out normally, and achieve stable control, stable ethylene content, The effect of product quality assurance

Inactive Publication Date: 2002-01-23
SINOPEC YANGZI PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, during the production process, the feeding system of the No. 3 polymerization reactor is prone to blockage, which leads to the failure of normal production and seriously affects the expansion of the output of block copolymers.

Method used

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  • Material pipe jam preventing method in production of polypropylene block copolymer
  • Material pipe jam preventing method in production of polypropylene block copolymer

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Such as figure 1 As shown, on the line from No. 3 polymerization reactor powder conveying fan 7 outlet to No. 3 polymerization reactor powder feed tank 3, add low-purity nitrogen introduction pipeline 5 and surface deactivator Atmer163 injection pipeline 6, through the diaphragm pump. Inject Atmer163. Prepare low-purity nitrogen before changing production, and its oxygen concentration is 5600ppm. Add low-purity nitrogen and Atmer163 (produced in the UK) to the system 5 hours before ethylene injection, and the addition amount is 10Nm respectively 3 / hr, 12L / hr, so that the whole system is filled with low-purity nitrogen and Atmer163, and then cast ethylene to produce block copolymers such as J340, J440, J540, J640, J740, etc., and achieved good results. Pipeline blockage occurs, the output per hour reaches 12 tons, and the product quality is superior. The performance of J340 is shown in the table below. It can be seen from the table that the strength indicators of Yangz...

Embodiment 2

[0017] Embodiment 2: equipment transformation as embodiment 1

[0018] Prepare low-purity nitrogen before switching to block copolymer J340, and its oxygen concentration is 6000ppm. Add low-purity nitrogen and surface deactivator Atmer163 to the system 3 hours before ethylene injection, and the addition amount is 8Nm 3 / hr and 8L / hr, make the whole system full of low-purity nitrogen and Atmer163, and then put into ethylene to produce J340 ethylene-propylene block copolymer, and achieved good results, the whole production process is smooth without pipe blockage, and the output per hour reaches 11.5 Ton.

[0019] Test items

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Abstract

The material pipe jam preventing method includes the steps of: increasing one low purity nitrogen feeding pipe and one surface deactivating agent injecting pipe from the powder conveying blower outlet to the powder material tank of the third polymerizing reactor; filling the pipeline with low purity nitrogen and surface deactivating agent before ethylene is added into the fourth polymerization reactor continuously; and adding ethylene into the fourth polymerizing reactor to produce ethylene-propylene block copolymer. The method can prevent jam for long time production stably.

Description

1. Technical field [0001] The invention relates to a production process of polyethylene-propylene block copolymer. 2. Background technology [0002] The present invention is the improvement of the polypropylene production device of Japan Mitsui Oil & Chemical Company. The technology of Japan's Mitsui Oil & Chemical Company adopts the HYPOL process, which uses a high-efficiency carrier catalyst and eliminates the deashing and random matter removal processes. The device is composed of two liquid-phase polymerization reactors No. 1 and No. 2 and two gas-phase polymerization reactors No. 3 and 4. The device was originally designed to produce polypropylene homopolymers, random copolymers and block copolymers with excellent properties. Due to its high impact strength and medium fluidity, block copolymers are widely used in tool boxes, turnover boxes, blow molding products, etc., and have broad market prospects. However, the technical requirements for producing block copolymers ...

Claims

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Application Information

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IPC IPC(8): C08F2/00C08F10/00
Inventor 辛宝山姜京阚林詹德明吴正军朱新华许造明夏华
Owner SINOPEC YANGZI PETROCHEM
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