HFO Manufacturing via CO2 Diluent and Alkaline Absorption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for manufacturing hydrofluoroolefin, such as HFO-1123 and HFO-1234yf, face challenges in separating hydrofluoroolefin from diluent gases due to low boiling points, requiring severe low-temperature and high-pressure conditions, which increases equipment costs and complexity.
Innovation Solution
A manufacturing method involving the conversion of hydrofluorocarbon into hydrofluoroolefin in the presence of carbon dioxide, followed by separation using an alkaline solution, allowing for efficient separation of hydrofluoroolefin and carbon dioxide, even when the boiling point is low, and utilizing a catalyst like metal oxides or halides to facilitate the dehydrofluorination reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If nitrogen is used as diluent gas in dehydrofluorination reaction, then the reaction can proceed, but severe low-temperature and high-pressure conditions are required for separation, increasing equipment cost and complexity
Solution Approach 1:
The patent changes the physical parameter of the diluent gas from nitrogen (boiling point -196°C) to carbon dioxide (boiling point -78°C). This parameter change makes the separation condition less severe, allowing separation at higher temperatures and lower pressures, thereby reducing equipment complexity and cost while maintaining ease of manufacture
Solution Approach 2:
The patent introduces carbon dioxide as an intermediary substance that serves as the diluent gas. Carbon dioxide acts as a mediator between the reaction system and the separation process, enabling easier separation compared to nitrogen due to its higher boiling point, thus resolving the contradiction between ease of separation and equipment complexity
2Manufacturing precision
If low-temperature and high-pressure equipment is used for separation, then hydrofluoroolefin can be separated from diluent gas, but manufacturing cost increases
Solution Approach 1:
The patent changes the operating parameters by selecting carbon dioxide as diluent gas with a higher boiling point than nitrogen. This allows the separation process to occur at higher temperatures and lower pressures, eliminating the need for expensive low-temperature and high-pressure equipment while maintaining effective separation efficiency
Solution Approach 2:
The patent employs carbon dioxide, which is relatively inexpensive and easily available, as the diluent gas. This substitution reduces material costs compared to using nitrogen, and combined with the easier separation conditions, significantly reduces overall manufacturing cost while maintaining separation efficiency
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 method enables easy separation of hydrofluoroolefin from diluent gases, reducing manufacturing costs and improving productivity by using carbon dioxide as a diluent and an alkaline solution for separation, while maintaining environmental considerations.
Implementation Method 1
a step obtaining a second gas composition containing the hydrofluoroolefin by separating the carbon dioxide contained in the first gas composition
Implementation Method 2
The manufacturing method involves the conversion of hydrofluorocarbon into hydrofluoroolefin in the presence of carbon dioxide, followed by separation using an alkaline solution
Implementation Method 3
a step obtaining a first gas composition containing hydrofluoroolefin and carbon dioxide by converting hydrofluorocarbon represented by the following formula (1) into the hydrofluoroolefin represented by the following formula (2) in the presence of the carbon dioxide
Data Source
AI summary
A method for manufacturing hydrofluoroolefin, includes: converting hydrofluorocarbon represented by a formula (1) into hydrofluoroolefin (HFO) represented by formula (2) in the presence of carbon dioxide to obtain a first gas composition containing hydrofluoroolefin and carbon dioxide; and separating carbon dioxide contained in the first gas composition to obtain a second gas composition containing HFO, CR1R2X1CR3R4X2 . . . (1), CR1R2═CR3R4 . . . (2), wherein R1 to R3 are each independently hydrogen atom or fluorine atom, R4 is hydrogen atom, fluorine atom, CH3, CH2F, CHF2 or CF3, the total number of fluorine atoms of R1 to R4 is one or more, and the total number of hydrogen atoms of R1 to R4 is one or more, X1 and X2 are each hydrogen atom or fluorine atom where X2 is the fluorine atom when X1 is the hydrogen atom, and X2 is the hydrogen atom when X1 is the fluorine atom.