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Catalyst containing load odd tianocene complexes and method for preparing polyethylene thereby

A technology of complexes and catalysts, which is applied in the field of catalysts containing supported mono-titanocene complexes and the preparation of polyethylene, which can solve the problems of active center side reactions, increase production costs, deactivation, etc., achieve high catalytic activity and reduce costs , prepare simple effects

Inactive Publication Date: 2008-05-21
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, while the single titanocene catalyst has many advantages, it also has some disadvantages, such as the active center of the catalyst is prone to inactivation due to occasional side reactions; Boron compounds are used as co-catalysts, which increases the production cost and limits the application of the catalyst. At the same time, the olefin polymerization is carried out in a homogeneous phase, and the prepared polymer is not in good shape. Widely used in some polymerization processes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The preparation of embodiment 1 single titanocene complexes

[0017] Put 0.84g (2.8mmol) pentamethylcenyl titanium trichloride into a dry 250ml reaction bottle filled with nitrogen, add 50ml of dry benzene, and slowly add 50ml containing 0.86 The dry benzene solution of g (8.5mmol) triethylamine and 0.91g (8.5mmol) benzyl alcohol was reacted at 30°C for 24h, filtered, the solvent was drained, extracted with dry n-hexane, and after standing for 4h, the upper layer The solution was transferred to a dry container, and then the solvent and volatiles were distilled off under reduced pressure at 60°C to obtain an orange-red oily substance, namely Cp*Ti(OBz) 3 , the yield was 64%.

[0018] Anal.Calcd.for C 31 h 36 o 3 Ti: C, 73.81; H, 7.14. Found: C, 73.26; H, 7.02.

Embodiment 2

[0019] The preparation step of embodiment 2 magnesium chloride ethanol complex

[0020] In a 250ml three-necked bottle with a magnetic stirring and condensing device, 10 g of anhydrous magnesium chloride and absolute ethanol [ethanol / magnesium chloride (molar ratio)=3:1] were added successively at room temperature, and then the temperature was gradually raised to dissolve the magnesium chloride to form a uniform and transparent The solution. Add 40ml of dry n-heptane to fully disperse and emulsify the magnesium chloride ethanol complex solution, then drain the n-heptane and excess ethanol under vacuum to obtain the white powdered magnesium chloride ethanol complex, then N 2 Store under airtight protection. Analyzing the composition of the test carrier as MgCl 2 2.92C 2 h 5 Oh.

[0021] All the above operations are carried out under anhydrous and oxygen-free conditions.

Embodiment 3 3

[0022] Embodiment 3 triethylaluminum processes the step of magnesium chloride ethanol complex

[0023] Under nitrogen protection, add 5 g of the magnesium chloride ethanol complex prepared in Example 2 into a 250 ml glass reaction bottle, add 20 ml of n-heptane, stir to form a slurry, and slowly add 15 ml of triethylaluminum n-heptane at 0°C Alkanes solution (concentration: 0.3g / ml), slowly raised to room temperature, reacted for 24h, then filtered out the liquid, washed the solid three times with n-heptane, and drained the n-heptane until a fluid powder was obtained.

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Abstract

The invention discloses a catalyst containing and loading titanocene complex and a method of using the catalyst to prepare for polyethylene. The catalyst consists of a main catalyst and an assistant catalyst. The titanocene is loaded at a carrier of modified magnesium chloride to form the main catalyst; Et2AlCl is used as the assistant catalyst. A structural general formula of the titanocene complex is RTiL3. The carrier of modified magnesium chloride is magnesium chloride alcohol complex compound modified from triethylaluminum. The novel catalyst of the invention ensures that ethylene polymerization reaction can be processed when ordinary alkylaluminium is used as the assistant catalyst, which saves expensive MAO or boron polyfluoride compound and reduces the cost of the catalyst greatly; the catalyst has high catalytic activity, simple preparation and good stability, and at the same time the invention can obtain the polyethylene with the high molecular weight and the good form.

Description

technical field [0001] The invention relates to the technical field of polyethylene preparation, in particular to a catalyst containing a supported mono-titanocene complex and a method for preparing polyethylene. Background technique [0002] In recent years, a large number of facts have proved that in the field of olefin polymerization, monometallocene compounds have attracted more and more attention. In particular, mono-titanocene metal compounds can not only catalyze the homopolymerization and copolymerization of ethylene and propylene, but also catalyze the syndiotactic polymerization of styrene. The single titanocene catalyst is a catalyst with a single active center. It has excellent performance and can control the molecular weight and molecular weight distribution, molecular chain branching structure, comonomer content and distribution on the main chain of polyethylene. However, while the single titanocene catalyst has many advantages, it also has some disadvantages,...

Claims

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Application Information

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IPC IPC(8): C08F4/654C08F110/02
Inventor 林尚安刘丹祝方明伍青高海洋
Owner SUN YAT SEN UNIV
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