Polyolefin Particle Transfer via Gravity and Pressure Differential
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Solution Overview
Problem
Current polyolefin production methods using multiple gas-phase polymerization tanks face inefficiencies in output per volume, as they rely on pressure differences that can be high and variable, affecting the stability and efficiency of particle transfer and polymerization processes.
Innovation Solution
A method involving two or more gas-phase polymerization tanks connected through a transfer pipe, where the connection point between the first tank and the transfer pipe is higher than the connection point between the second tank and the transfer pipe, utilizing a pressure difference of 130 kPa≥P1−P2≥0 to facilitate particle transfer by gravity, and incorporating a valve for adjusting the transfer amount of polyolefin particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If polyolefin particles are transferred using a high pressure difference (about 400 kPa) between polymerization tanks, then particle transfer can be achieved, but the system requires complex valve switching operations and higher energy consumption
Solution Approach 1:
The invention positions the connection place in the first polymerization tank higher than the connection place in the second polymerization tank, creating a gravitational potential difference that enables particle transfer without requiring high pressure differences or complex valve switching operations. This height difference allows particles to flow naturally from the first to the second tank under gravity assistance.
2Ease of operation
If the connection place in the first polymerization tank is positioned higher than in the second tank, then particle transfer is facilitated by gravity with smaller pressure difference, but the system requires precise pressure control within the range 130 kPa≥P1−P2≥0
Solution Approach 1:
The invention changes the pressure difference parameter from the conventional high value (about 400 kPa) to a controlled range of 130 kPa≥P1−P2≥0, combined with the height difference configuration. This parameter optimization enables gravity-assisted particle transfer while reducing energy consumption and simplifying operational complexity.
3Productivity
If conventional polyolefin production methods are used with multiple gas-phase polymerization tanks, then polymerization can be performed in stages, but the output per total volume of polymerization tanks is limited
Solution Approach 1:
The invention introduces a vertical height dimension to the particle transfer system by positioning connection places at different heights. This spatial configuration enables gravity-assisted particle transfer between tanks, improving production efficiency without proportionally increasing system complexity, as the height difference naturally facilitates particle movement.
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 enhances the output of polyolefin per total volume of gas-phase polymerization tanks, improving production efficiency by stabilizing particle transfer and polymerization processes, while maintaining a controlled pressure difference to optimize particle flow.
Implementation Method 1
the connection place between the first gas-phase polymerization tank and the transfer pipe is higher than the connection place between the second gas-phase polymerization tank and the transfer pipe
Implementation Method 2
when P1 represents the pressure in the first gas-phase polymerization tank and P2 represents the pressure in the second gas-phase polymerization tank, 130 kPa≥P1−P2≥0 is satisfied
Data Source
AI summary
A method for producing a polyolefin is provided. The method includes steps of polymerizing an olefin in a first gas-phase polymerization tank to obtain polyolefin-containing particles, transferring the polyolefin-containing particles to a second gas-phase polymerization tank through a transfer pipe, and polymerizing an olefin in the presence of the transferred polyolefin-containing particles in the second gas-phase polymerization tank. A connection place between the first gas-phase polymerization tank and the transfer pipe is higher than a connection place between the second gas-phase polymerization tank and the transfer pipe. 130 kPa≥P1−P2≥0 is satisfied, where P1 represents the pressure in the first gas-phase polymerization tank and P2 represents the pressure in the second gas-phase polymerization tank.