OF-1233E Purification via Weak Base Neutralization
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Solution Overview
Problem
Current methods for removing hydrogen fluoride from OF-1233E compositions, such as adsorption or washing, face challenges like equipment damage, corrosion, inefficient removal, and generation of difficult-to-distill components, which complicates the purification of (E)-1-chloro-3,3,3-trifluoropropene.
Innovation Solution
The use of a weak base, such as sodium hydroxide or tertiary amines, to contact the OF-1233E composition, effectively removing hydrogen fluoride without generating new components that resemble OF-1233E in distillation behavior, allowing for efficient purification through simple distillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hydrogen fluoride is removed by washing with water, then operation is easy, but washing efficiency is low and equipment corrosion occurs
Solution Approach 1:
The patent changes the chemical parameter of the washing solution from neutral water to alkaline solution (pH 7-14), which fundamentally alters the removal mechanism from physical dissolution to chemical neutralization. This parameter change enables both high washing efficiency through complete chemical reaction and ease of operation by maintaining solution stability throughout the process
2Reliability
If strong base such as sodium hydroxide is used for washing, then hydrogen fluoride removal is effective, but new difficult-to-distill components are generated
Solution Approach 1:
The patent optimizes the alkalinity parameter within a specific range (pH 7-14) to achieve complete hydrogen fluoride removal while preventing excessive base concentration that would cause decomposition reactions. This controlled parameter adjustment ensures high removal efficiency without generating difficult-to-distill by-products
Solution Approach 2:
The patent applies partial action by using just enough base to neutralize hydrogen fluoride without excessive base concentration. The controlled pH range ensures sufficient neutralization while avoiding the excessive base conditions that would lead to decomposition of OF-1233E and formation of hard-to-separate components
3Reliability
If adsorption onto solid adsorbent such as sodium fluoride is used, then hydrogen fluoride removal is effective, but regeneration or disposal becomes difficult with increase in treatment amount
Solution Approach 1:
The patent replaces the mechanical adsorption system with a chemical neutralization system using alkaline solution. This substitution transforms the removal mechanism from physical adsorption (requiring regeneration equipment) to chemical reaction (producing soluble salts), thereby eliminating the need for complex regeneration or disposal systems while maintaining high removal 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 the efficient removal of hydrogen fluoride, preventing equipment damage and corrosion, while ensuring high-purity (E)-1-chloro-3,3,3-trifluoropropene production without generating difficult-to-separate components, facilitating its use as cleaning agents, refrigerants, and heat mediums.
Implementation Method 1
contact treatment with a weak base... effectively removing hydrogen fluoride
Implementation Method 2
purification through simple distillation
Data Source
AI summary
The present invention provides a process for purifying a (E)-1-chloro-3,3,3-trifluoropropene composition (OF-1233E composition) in which at hydrogen fluoride and 2-chloro-1,1,1,3,3-pentafluoropropane are contained by bringing the (E)-1-chloro-3,3,3-trifluoropropene composition into contact with a weak base and a method for producing (E)-1-chloro-3,3,3-trifluoropropene composition by distilling the (E)-1-chloro-3,3,3-trifluoropropene composition obtained by such a purification process. This makes it possible to efficiently produce OF-1233E by removing the hydrogen fluoride from the OF-1233E composition, without generating any new component difficult to separate by distillation, and subjecting the resulting composition to distillation.