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A preparing method of a Z-N catalyst

A catalyst, Z-N technology, applied in the field of Z-N catalyst preparation, can solve the problems of uneven product particle size distribution, easy separation in storage and transportation, uneven PE particle size, etc.

Active Publication Date: 2016-07-06
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Although the above-mentioned patent can produce bimodal PE by using catalyst mixing method or bimetallic composite catalyst, it has the following disadvantages: the two catalysts or metal elements interact with each other, the catalyst activity is low, and the particle size of the generated PE is uneven, and the It is easy to separate during transportation and transportation, which leads to more uneven particle size distribution of the product
[0015] CN103254330A, CN201110391120 and CN102408504A load a vanadium compound on the composite carrier Mg nAl, and then catalyze the synthesis of polyethylene products from ethylene and α-olefin, but the activity of the catalyst is relatively low

Method used

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  • A preparing method of a Z-N catalyst

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Experimental program
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Effect test

Embodiment 1

[0039] (1) Catalyst preparation

[0040] The first step: use N 2 Purge the 2000mL reactor, add 85.5g (3.5mol) of Mg powder, heat in an oil bath, raise the temperature to 80°C, and keep it for 1h. Add 0.1g iodine (I 2 ), after 40 minutes of reaction, 2 mL of chlorobutane and 36 mL of chlorobenzene mixed solvent were added, after the reaction was initiated, stirring was started, and a mixture of 300 mL of ether and 96 mL of chlorobenzene was added dropwise. The reaction temperature was 90° C., and the addition was completed in about 60 minutes. Afterwards, a mixture of 100 mL of ether and 38 mL of chlorobenzene was added dropwise, and then 600 mL of chlorobenzene was added dropwise, and the addition was completed in about 90 minutes. React 6h, cool down, stop stirring, under N 2 Natural settlement under protection, the upper wine red liquid is organomagnesium compound (MOS), wherein the magnesium content is 1.02mol / L.

[0041] The second step: adjust the temperature of the r...

Embodiment 2

[0046] According to the operation process of Example 1, the Mg powder was heated to 40° C. in the first step to obtain a magnesium content of 0.96 mol / l in the MOS solution. Other operations are the same as in Example 1 to obtain 42.8g of catalyst, Ti content is 1.01%, V content is 2.89%, n in Mg nAl is 0.84, catalyst activity is 12.2kgPE / gcat, polymer bulk density is 0.39g / cm 3 , the molecular weight distribution Mw / Mn of the polymer is 27, see Table 1 for details.

Embodiment 3

[0048] According to the operation process of embodiment 1, in the first step, the one-time addition of ether is 200mL, other operations are the same as in embodiment 1, and 47.2g of catalyst is obtained, the Ti content is 0.97%, the V content is 2.71%, and n in Mg·nAl is 0.91, catalyst activity 14.5kgPE / gcat, polymer bulk density 0.43g / cm 3 , the molecular weight distribution Mw / Mn of the polymer is 25, see Table 1 for details.

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Abstract

The invention relates to a method of preparing bimodal and / or wide-molecular-weight-distribution polyethylene through a single reactor. The method includes preparing a composite-carrier type Z-N catalyst with a structure formula of Ti-VMg.nAl, and directly catalyzing ethylene or ethylene and higher alpha-olefin in a single reactor to synthesize a bimodal and / or wide-molecular-weight-distribution polyethylene product. The higher alpha-olefin is one or a mixture of more than two selected from propylene, butylene-1, hexane-1, octylene-1, cyclopentadiene and cyclohexene. The catalyst is high in carrier strength and is not liable to break in polymerization, thus increasing the bulk density of the polymer product, making the fine powder content low, and facilitating industrial production. The catalyst is suitable for slurry-method and gas-phase-method processes. Large transformation in industrial production devices at present is not needed. The method is easy to implement and low in cost. Problems such as a high production cost, difficult product homogenization, easily volatile quality, a high degree of production control difficulty, and the like of a serial-process production technique can be overcome.

Description

technical field [0001] The invention relates to a preparation method of a Z-N catalyst, in particular to a method suitable for producing bimodal and / or wide molecular weight distribution polyethylene products by a single reactor in the production process of slurry method and gas phase method. Background technique [0002] Bimodal / broad molecular weight distribution polyethylene well solves the contradiction between processing performance and mechanical and physical properties of polyethylene resin, so it is widely used in film, pipe and other fields. [0003] There are generally three techniques for preparing bimodal / broad molecular weight distribution polyethylene: melt blending method, series reactor method (section reaction method) and single reactor method (one-stage reaction method). The melt blending method refers to the production of polymers with larger and smaller relative molecular weights in two parallel reactors, and then melt mixing them in a certain proportion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F4/685C08F4/02
Inventor 崔立娟赵增辉王国强赵成才吴伟王登飞付义王斯晗宋磊高宇新方宏于占元姜进宪胡波任鹤任合刚王立娟梁立伟何书艳张瑀健许长辉张婷樊凤祥王炎鹏段少华
Owner PETROCHINA CO LTD
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