Preparation By Halogen Replacement TRIZ Cases
- Bromochloromethane Preparation with Catalytic Phase Separation
Catalyst selection plus water or alcohol phase splitting raises bromochloromethane yield and enables cleaner, simpler separation.
- HFC-23 Recycling Catalyst Composition for Stable Low-CFC-12 Conversion
Metal oxide additives stabilize HFC-23 recycling catalysts and cut CFC-12 by-product formation while preserving HCFC-22 selectivity.
- 17-Methylalkane Synthesis via Distillable Halo Intermediate
A distillable 1-halo-7-methyltricosane intermediate enables scalable, high-yield 17-methylalkane synthesis without chromatography.
- Fluoroethylene Production via Metal Fluoride Isomer Selectivity
Metal fluoride fluorination of halogenated ethylenes improves fluoroethylene yield while enabling selective HFO-1132 and HFO-1123 production.
- Low-HF Liquid-Phase Fluorination for Selective HCFO-1233zd Production
A low-HF liquid-phase process limits overfluorinated coproducts, reducing purification complexity, corrosion risk, and HF usage.
- HFO-1234yf Synthesis via Segmented Fluorination
Segmented gas phase fluorination with a chromium catalyst produces HFO-1234yf, resolving the trade-off between production efficiency and cost-effectiveness.
- BFTFB Synthesis via Photo-Bromination and NBS Mediator
UV-driven photo-bromination with NBS mediator overcomes bromine evaporation and agent instability, achieving 73.9% yield.
- Uncatalyzed Fluorination of Tetrachloropropene for E-1233zd
An unstirred reactor conducts uncatalyzed liquid phase fluorination to achieve high conversion rates while suppressing oligomer formation.
- Inorganic Fluoride Chlorine-Fluorine Exchange for CFC Production
Germanium tetrafluoride enables chlorine-fluorine exchange on chlorocarbons to produce high-purity chlorofluorocarbon compounds.
- Vapor-Phase Fluorination Catalyst for HFC-152a Production
A vapor-phase catalytic fluorination process using chromia, alumina, and carbon to produce 1,1-difluoroethane with high selectivity.
- Fluorination Catalyst Regeneration Using Nitrogen Trifluoride
Nitrogen trifluoride reactivates spent metal oxide fluorination catalysts without generating water, preventing equipment corrosion and extending useful life.
- HFO-1234ze Production via Disproportionation of HCFO-1233zd
Vapor-phase disproportionation of HCFO-1233zd over chromium catalysts yields HFO-1234ze without generating corrosive hydrofluoric acid.
- Two-Step Fluorination of Chloropropenes for HFO Synthesis
A two-step fluorination process converts chloropropenes into hydrofluoroolefins using liquid and gas phase reactions.
- Purifying 1-chloro-3,3,3-trifluoropropene via Buffered Neutralization
Buffered neutralization with sulfite salts prevents dehydrochlorination of 1-chloro-3,3,3-trifluoropropene, reducing trifluoropropyne formation.
- Zinc-Promoted Chromium Fluorination Catalyst Activity Stability
Limiting chromium VI prevents chromia crystallization, maintaining catalyst stability during hydrocarbon fluorination.
- In-situ Trifluoromethylbenzaldehyde Synthesis Without Halogen Transfer Catalysts
Directly fluorinating trichloromethylbenzal chlorides with hydrogen fluoride eliminates halogen transfer catalysts, reducing process complexity and costs.
- Chlorine-Containing Fluorocarbon Synthesis via Catalyst-Free HF
Anhydrous hydrogen fluoride fluorinates pentachloropropane without a catalyst to produce monofluorinated products.