Propanol Dehydration to Propylene via Moderate Temperature Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing C2+ olefins, such as ethylene and propylene, from alcohols like methanol are inefficient due to high temperatures leading to catalyst deactivation, by-product formation, and the difficulty in separating desired olefins from aromatic and alkane by-products, making the process costly and complex.
Innovation Solution
A new process involving the dehydration of propanol to produce propylene, which forms carbon-carbon double bonds by eliminating water without carbon fragment coupling, using a vapour phase reactor at moderate temperatures and pressures, followed by separation and purification steps to achieve high selectivity and reduce by-product formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high temperatures are used in alcohol dehydration to produce olefins, then reaction rate increases, but catalyst deactivation occurs and by-product formation increases
Solution Approach 1:
The patent changes the temperature parameter from conventional high temperatures (300-500°C) to moderate temperatures (160-270°C), and adjusts pressure parameters to 0.1-4.5 MPa, creating new operating conditions that maintain reaction activity while preventing catalyst deactivation and reducing by-product formation
Solution Approach 2:
The patent introduces ether formation as an intermediary process that facilitates water separation and recycling, enabling the dehydration reaction to proceed at moderate temperatures while maintaining high selectivity for propylene production
2Productivity
If conventional dehydration processes are used, then olefins are produced, but separation from aromatic and alkane by-products becomes difficult and costly
Solution Approach 1:
The patent converts the traditionally harmful effect of ether formation into a beneficial process feature, where ether formation facilitates easier water separation and recycling, and the moderate temperature conditions reduce by-product formation, simplifying the separation process and reducing operational costs
3Productivity
If high conversion is achieved in propanol dehydration, then propylene yield increases, but selectivity decreases due to increased by-product formation
Solution Approach 1:
The patent optimizes temperature and pressure parameters to achieve a balanced operating window (160-270°C, 0.1-4.5 MPa) that simultaneously achieves moderate conversion and high selectivity, avoiding the trade-off between yield and purity that plagues conventional processes
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 process achieves high selectivity and moderate conversion of propanol to propylene with reduced by-product formation, improving the efficiency and cost-effectiveness of olefin production by operating at lower temperatures and utilizing ether formation for easier water separation and recycling.
Implementation Method 1
the dehydration of propanol to produce propylene, which forms carbon-carbon double bonds by eliminating water without carbon fragment coupling
Implementation Method 2
using a vapour phase reactor at moderate temperatures and pressures
Implementation Method 3
the said product stream B2 is cooled, the said cooled product stream B2 is disengaged in a separation unit
Data Source
Figure 1
AI summary
The present invention relates to a process for the production of propylene from a feedstock comprising propanol.