Polyolefin Production Using Controlled Organohalide Concentrations
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Solution Overview
Problem
Conventional methods for producing linear low density polyethylene using 1-hexene as a raw material often involve removing organohalides to prevent catalyst deactivation, but this is not always necessary, as specific concentrations of organohalides can actually increase catalyst activity.
Innovation Solution
Incorporating organohalides in concentrations of 0.05 to 10 ppm by weight in terms of halogen atoms during the polymerization of 1-hexene, obtained through trimerization reactions using a chromium series catalyst, to enhance catalyst activity without deactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organohalide is removed from 1-hexene to prevent catalyst deactivation, then catalyst reliability is improved, but productivity decreases due to additional removal steps and loss of potential catalyst activity enhancement
Solution Approach 1:
The invention changes the concentration parameter of organohalide from complete removal (0 ppm) to a specific optimal range (0.05-10 ppm). This parameter optimization transforms organohalide from a harmful impurity to a beneficial additive that enhances catalyst activity while maintaining reliability within the controlled concentration range
Solution Approach 2:
The invention converts the traditionally harmful organohalide impurity into a beneficial substance by controlling its concentration within the optimal range of 0.05-10 ppm. At this controlled level, organohalide no longer deactivates the catalyst but instead enhances catalyst activity and polymerization productivity
2Reliability
If organohalide removal methods are applied, then catalyst protection is improved, but manufacturing complexity increases due to additional purification steps
Solution Approach 1:
The invention extracts only the harmful portion of organohalide by setting a specific concentration threshold (0.05-10 ppm). Instead of complete removal, the process maintains beneficial trace amounts while eliminating excessive concentrations, thereby simplifying the purification process while still protecting the catalyst
Solution Approach 2:
The invention changes the purity parameter specification from requiring complete organohalide removal to accepting controlled concentrations of 0.05-10 ppm. This parameter relaxation eliminates complex purification steps while maintaining catalyst protection through controlled composition
3Manufacturing precision
If complete organohalide removal is performed, then polymer purity is improved, but loss of substance increases due to removal of potentially beneficial organohalide
Solution Approach 1:
The invention applies partial removal action by maintaining organohalide at optimal concentrations (0.05-10 ppm) rather than complete removal. This partial presence of organohalide provides beneficial effects on catalyst activity and polymer properties while minimizing the need for extensive purification that would cause substance loss
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach increases catalyst activity and yields, allowing for the industrially advantageous production of polyolefins like linear low density polyethylene by maintaining optimal organohalide levels.
Implementation Method 1
trimerization reaction of ethylene using a chromium series catalyst
Implementation Method 2
concentration of an organohalide to the raw material olefin is from 0.05 to 10 ppm by weight in terms of a halogen atom
Data Source
AI summary
The object of the present invention is to provide a production method for a polyolefin, in which catalyst activity is improved, and a polyolefin such as a linear low density polyethylene can advantageously be industrially produced. The present invention relates to a production method for a polyolefin, in which in producing a polyolefin by the polymerization reaction of an olefin using a catalyst, an organohalide is present in the reaction system in an amount of from 0.05 to 10 ppm by weight in terms of the halogen atom as a concentration in a raw material olefin, and 1-hexene for linear low density polyethylene production raw material, containing an organohalide in an amount of from 0.05 to 10 ppm by weight in terms of the halogen atom.