Halogenated Hydrocarbon Preparation TRIZ Cases

Molten metal or alloy at 300-900°C boosts fluoropolymer pyrolysis, raising fluoromonomer conversion for more efficient recycling.

Organic sulfur compounds boost fluoropolymer pyrolysis, raising fluoromonomer conversion at moderate temperatures with simple kiln processing.

A hydrochloric acid and Lewis acid route converts triphenylmethanol cleanly, avoiding waste gas, corrosion, and low-yield side reactions.

A tuned resin molar ratio preserves low dielectric loss and heat resistance while preventing copper foil corrosion in high-frequency packaging.

Controlling distillation temperature, water, and acetic acid composition suppresses acetal formation and improves acetaldehyde removal.

Controlling gas and absorber temperature gaps during microwave fluororesin decomposition improves monomer selectivity in the output gas.

Zeolite with a controlled SiO2/Al2O3 ratio and pore size removes impurities from hexafluorobutadiene while suppressing isomerization.

Controlling the gap between microwave absorber, carrier gas, and outlet gas temperatures improves fluororesin decomposition selectivity and target yield.

A specific ionic catalyst drives olefin insertion into fluorinated organic iodine compounds, enabling mild, metal-free synthesis with cleaner copolymer end-group control.

Adding organic sulfur compounds improves fluoropolymer thermal decomposition, boosting fluoromonomer yield at lower temperatures.

Molten metal or alloy improves heat transfer during fluoropolymer pyrolysis, raising fluoromonomer conversion for recycling.

Phase separation and azeotropic recovery convert monoethylene glycol and HCl into high-purity ethylene dichloride with efficient recycle.

Using a low-boiling extraction solvent, this case separates vinylidene fluoride from trifluoromethane with lower distillation energy and easier solvent recovery.

Zeolite 4A selectively removes R23 from vinylidene fluoride, overcoming close boiling points and enabling 99%+ VdF purity for polymerization.

A low-boiling extraction solvent helps separate vinylidene fluoride from trifluoromethane with lower distillation energy and high VdF purity.

Extractive and pressure swing distillation separate the HFC-143/chloroethane azeotrope to improve HFC-143 recovery and HFO-1132E purity.

An amine-containing solvent breaks the HFO-1132(E)/HFC-143a separation bottleneck, cutting HFC-143a below 0.1 mass % in extractive distillation.

Ionizing radiation and UV light selectively cleave bonds in hydrofluorocarbons, producing HFOs or FOs at 95 mol% selectivity without catalysts.

Chlorine-containing extraction solvents reduce relative volatility to separate R22 and HFP into concentrated streams.

Distillation struggles with close-boiling haloalkane and haloalkene impurities; solid adsorbents raise fluoroolefin purity to 99.9%.

Distillation cannot split constant-composition refrigerant mixtures, so selective ionic-liquid absorption recovers components such as R-32 and R-125.

A chlorine-containing extraction solvent reduces volatility differences, separating high-purity HFP from concentrated R22 by distillation.

This case uses a specific ionic catalyst to control olefin insertion into C-I bonds, improving purity and molecular weight distribution.

Activated carbon columns remove hydrogen iodide from trifluoroacetyl iodide feedstock to improve trifluoroiodomethane production selectivity.

Thermolyzing longer perfluoroalkyl iodides yields shorter chain products, avoiding inert by-products and eliminating added iodine.

Recycling reaction by-products attains equilibrium between feed and outlet compositions to increase yield of 2,3,3,3-tetrafluoropropene.

Microwave heating decomposes fluoropolymers into fluoroolefins, raising conversion rates and reducing equipment clogging.

Solvent-assisted extractive distillation separates HFC-143 from HCFC impurities using selective solvation.

Trihalomethane converts butene impurities into higher boiling compounds, enabling efficient distillation and reducing production costs.

Passing halogenated propenes through a solid adsorbent bed neutralizes corrosive acids, protecting downstream equipment.

Vapor diffusion of vinyl chloride into carbon tetrachloride prevents polyvinyl chloride formation, maintaining catalyst activity and heat management.

Lewis acid metal fluoride catalysts transform cis olefins into trans isomers, reducing separation complexity and production costs.

Optimized batch bromination using excess liquid bromine and aluminum Lewis acid catalyst ensures high assay decabromodiphenylethane purity.

Reacting potassium cycloalkyl carboxylate with bromine using a radical initiator or light irradiation to produce cycloalkyl bromides.

Replacing expensive palladium with nickel or copper catalysts lowers manufacturing costs while maintaining high conversion rates and selectivity.

Extractive distillation with a solvent resolves the boiling point similarity between hexafluorobutadiene and impurities to achieve high purity.

Centrifugal force in rotating packed beds overcomes azeotrope formation and close boiling points to achieve high purity hydrohalocarbon separation.

Solvents modify relative volatility to break the azeotropic composition, enabling efficient separation of HFO-1234yf and chloromethane.

Triarylphosphite mediates bromination of cyclopropylmethanol, resolving solubility limits and preventing ring opening to achieve high purity.

A foam-forming composition uses cis-1,1,1,4,4,4-hexafluoro-2-butene with active hydrogen compounds to create closed-cell polyurethane foams.

A bromination process using liquid bromine and aluminum halide catalysts produces stable polymer compositions.

CuCl catalyzed stereoselective addition overcomes thermodynamic trans-isomer preference, achieving 80% cis-yield without multiple reaction cycles.

Two-stage pyrolysis of fluorinated ionomers at 450°C and 550°C boosts olefin yield while minimizing side products from sulfonic acid groups.

Direct chlorination of 1,4-bis(difluoromethyl)benzene eliminates solvents and photoinitiators to resolve long reaction times and low yields.

A solvent selectively extracts trifluoroiodomethane from azeotropic mixtures to enable high-purity separation.

Hydrogen fluoride forms a ternary azeotrope with HCFC-244bb and HCFO-1233xf, resolving binary azeotrope formation that blocks conventional separation.

Thionyl chloride converts propargyl alcohol to the intermediate without phosgene, eliminating toxic waste and complex separation steps.

Hydrophobic zeolite adsorbents remove water and halogenated impurities simultaneously, eliminating separate processing stages.

Molecular sieves selectively adsorb methyl chloride from fluorinated olefin mixtures to isolate high purity products.

Steam-mediated thermal decomposition converts chlorodifluoromethane and chloromethane into HFO-1234yf, suppressing carbonization and reducing reactor corrosion.