Continuous method for preparing syndiotactic polyvinyl aromatic hydrocarbon

A technology of polyvinyl aromatics and vinyl aromatics, which is applied in the continuous field of preparing syndiotactic polyvinyl aromatics, can solve the problems of high stirring power, poor heat transfer, and low utilization of reactors, and achieve good technical effects and utilization rate-enhancing effect

Active Publication Date: 2007-05-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that there are problems of poor heat transfer in the reaction process, high stirring power, and low utilization rate of the reactor in the existing literature, and a new continuous method for preparing syndiotactic polyvinylarene is provided
This method can not only well solve the heat transfer and stirring problems in the polymerization process, greatly improve the utilization rate of the reactor, but also be easy to start and stop, and can solve the problem of industrial scale-up

Method used

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  • Continuous method for preparing syndiotactic polyvinyl aromatic hydrocarbon

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Embodiment 1

[0025] The three reactors described in the present invention are respectively composed of a 10-liter vertical prepolymerization kettle, a 10-liter horizontal double-shaft self-cleaning kettle and a 100-liter vertical conical reactor. First vacuum bake the three reactors and corresponding pipelines at 90°C for 8 hours, then lower the temperature to 60°C, and use N 2 After purging 3 times, open feed valve, make the flow of styrene monomer be 16 liters / hour, the flow of inert solvent hexane is 4 liters / hour, titanocene catalyst Cp * Ti(O-C 6 h 4 -OCH 3 ) 3 The flow rate is 1.4 mmol / h, the flow rate of methylaluminoxane MAO is 210 mmol / h, and the flow rate of triisobutylaluminum TIBA is 140 mmol / h. Start stirring at the same time, the stirring speed of 10 liters of pre-polymerization tank is 300 rev / min and the spiral belt presses down operation, the two screw rods in the self-cleaning reactor are different, one is the cleaning screw rod, the rotating speed is 30 rev / min, and ...

Embodiment 2

[0027] The three reactors described in the present invention are respectively composed of a 10-liter vertical prepolymerization kettle, a 10-liter horizontal double-shaft self-cleaning kettle and a 100-liter vertical conical reactor. First vacuum bake the three reactors and corresponding pipelines at 90°C for 8 hours, then lower the temperature to 60°C, and use N 2 After purging 3 times, open feed valve, make the flow of styrene monomer be 10 liters / hour, the flow of inert solvent hexane is 3 liters / hour, titanocene catalyst Cp * Ti(O-C 6 h 4 -OCH 3 ) 3 The flow rate is 1.2 mmol / h, the flow rate of methylaluminoxane MAO is 200 mmol / h, and the flow rate of triisobutylaluminum TIBA is 120 mmol / h. Start stirring at the same time, the stirring speed of 10 liters of pre-polymerization tank is 300 rev / min and the spiral belt presses down operation, the two screw rods in the self-cleaning reactor are different, one is the cleaning screw rod, the rotating speed is 30 rev / min, and ...

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Abstract

The invention relates to a continuous method for preparing syndiotactic polyvinyl aromatic hydrocarbon by employing at least three tandem reactors, wherein vinyl aromatic hydrocarbon monomer, inert solvent and catalyst are continuously charged into a pre-polymerizing reactor for pre-polymerization, loading into a second reactor before the conversion rate at the exit of a first reactor reaches 5%, and loading into a third reactor before the conversion rate at the exit of a second reactor reaches 25-30%, thus achieving a final conversion rate of 60-85%.

Description

technical field [0001] The present invention relates to a continuous process for the preparation of syndiotactic polyvinylarenes. Background technique [0002] The most typical syndiotactic vinyl aromatic polymer is syndiotactic polystyrene (sPS), which is a new type of semi-crystalline thermoplastic engineering plastics. Its high melting point (270 ° C) and crystallinity endow sPS with excellent resistance Heat, water resistance, chemical resistance, electrical insulation and dimensional stability. Syndiotactic polystyrene can be processed by existing engineering plastic molding equipment for extrusion, injection molding, etc. Most of the previous patents used a homogeneous catalytic system to prepare syndiotactic polystyrene. No matter what kind of catalytic system was used, the syndiotactic polymerization of styrene was accompanied by the crystallization process of the polymer, which was a special precipitation polymerization and had complex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F112/08C08F2/02
Inventor 沈志刚赵薇薇周文乐杨为民
Owner CHINA PETROLEUM & CHEM CORP
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