1-Octene Composition via Chromium Catalyst Selectivity
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Solution Overview
Problem
The high production cost of Linear Low-Density Polyethylene (LLDPE) due to the high cost of comonomers like 1-hexene and 1-octene, and the challenge of minimizing by-products during their preparation through ethylene oligomerization, which affects the purity and physical properties of polyolefins.
Innovation Solution
A catalyst system for ethylene oligomerization comprising a ligand compound with diphosphinoamine functional groups, a transition metal source, and a cocatalyst, which selectively produces a 1-octene composition with 90% or more 1-octene content, along with by-products that improve polyolefin physical properties, using a process that includes multimerization and distillation to separate the C8 liquid composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional catalysts are used for ethylene oligomerization to produce 1-octene, then 1-octene can be produced, but by-products are inevitably generated which require purification steps and reduce production efficiency
Solution Approach 1:
The patent modifies catalyst parameters by using a specific chromium complex with a particular ligand structure (Formula 1) and controlling the Al/Cr ratio, which changes the reaction selectivity to produce high 1-octene content (90-99 wt%) while minimizing by-products, thereby resolving the contradiction between purity and productivity
Solution Approach 2:
The patent converts the typically harmful by-products into beneficial components by selecting a catalyst system that produces specific by-products (1-hexene, 1-decene, dicyclopentadiene) that can be incorporated into polyolefins to improve physical properties, eliminating the need for purification while maintaining high 1-octene content
2Reliability
If comonomers like 1-hexene and 1-octene are used in high content for LLDPE production, then density control and physical properties are improved, but production cost increases
Solution Approach 1:
The patent changes the cost parameter by using a chromium catalyst system that produces 1-octene with 90-99 wt% content directly, eliminating the need for expensive purification steps and reducing overall production cost while maintaining high comonomer content for improved polyolefin properties
Solution Approach 2:
The patent converts the cost burden of by-products into a benefit by designing a catalyst that produces by-products useful for polyolefin copolymerization, allowing high content comonomer use for improved physical properties without additional purification costs
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
The catalyst system achieves high selectivity for 1-octene, reducing production costs and enhancing the physical properties of polyolefins by incorporating beneficial by-products, while minimizing unwanted by-products in the 1-octene composition.
Implementation Method 1
a chromium-based catalyst for ethylene trimerization having a ligand of the formula (R1)(R2)X—Y—X(R3)(R4) has been suggested
Implementation Method 2
using a process that includes multimerization and distillation to separate the C8 liquid composition
Data Source
AI summary
The present invention relates to a 1-octene composition. The 1-octene composition according to the present invention is prepared by ethylene oligomerization and comprises a high content of 1-octene and monomers useful for copolymerization of 1-octene at the same time.