Carboxylic Compound Separation/Purification TRIZ Cases

Absorbent-assisted cooling and distillation separate acetaldehyde by-products from bio-based acrylic acid to improve purity, yield, and process economics.

A two-draw distillation column creates acetic acid streams with different propionic acid levels while cutting energy use and process complexity.

Ion exchange, evaporation, nanofiltration, and cooling crystallization purify glycolic acid while avoiding high-temperature oligomer formation.

Organic-solvent and alkaline extraction simplifies biomass processing and supports polymers with improved compressive and flexural strength.

Diluting and cooling residue with a solvent manages viscosity in the separating column, enabling efficient acrylic acid recovery from Michael adducts.

Acetone inhibits polymerization of acrylic acid during rectification, preventing substance loss from precursor aldehydes.

A pressure filter mixes inert gas with solvent to separate carboxylic acid crystals, eliminating recirculation equipment and reducing capital costs.

Cooling (meth)acrylic acid gas via waste heat exchangers stabilizes concentration despite reactor fluctuations.

A purification method precipitates polycarboxylic acids from aqueous media by reducing pH and contacting the solids with organic solvents.

Continuous 1,2,4,5-cyclohexanetetracarboxylic acid feeding stabilizes the dehydration reaction in acetic anhydride slurry.

Adjusting water concentration below 10 mass percent via mixing prevents yield loss during unsteady state production.

Slurrying biphenol tetraacid in a C1-6 alcohol dissolves impurities, allowing filtration to remove contaminants that degrade poly(etherimide) optical clarity.

Thermal cleavage converts dimers to monomers while crystallization removes impurities, reducing energy consumption.

A catalyst removal zone washes cooled carboxylic acid to reduce impurity levels, preventing accumulation in the oxidizer mother liquor stream.

A pH-adjusted ultrafiltration process separates dicarboxylic acids from monocarboxylic acid salts in aqueous mixtures.

Seed-controlled melt crystallization removes angelica lactone impurities from levulinic acid, ensuring pharmaceutical-grade stability.

A radial centrifugal pump with a half-open impeller circulates fluid through an indirect heat exchanger to cleave Michael adducts.

Three-stage crystallization with activated carbon adsorption removes nitrate contamination and soluble impurities to produce high-purity adipic acid.

Temperature-controlled filtration precipitates dissolved acrylic acid polymers, preventing equipment fouling and ensuring high purity.

Repeated crystallization stages process methacrylic acid solutions with constant feed amounts to ensure stable operation and high purity.

Hydrophobic cross-linked polymers adsorb dicarboxylic acids from fermentation broths, resolving low product concentrations caused by substrate inhibition.

Coupled distillation columns recover technical grade acrylic acid without solvents, lowering capital costs and environmental impact.

Returning uncooled cooling medium to the crystallizer eliminates temperature gradients that cause residual impurities in purified (meth)acrylic acid.

Adding a quinoline derivative to glyoxal-containing streams prevents fouling in acrylic acid purification systems.

Pre-cooling the returned heating medium stabilizes the refrigerator during initial cooling-only phases, preventing temperature drift.

Admixing furfural with acrylic acid liquid phases converts glyoxal into less reactive hemiacetals, preventing thermal stress induced polymerization.

Sidestream drawoff in a distillation unit removes aldehydes from technical acrylic acid, eliminating carcinogenic reagents and water formation.

Tri-n-octylamine and 1-undecanol extract acetic acid from aqueous streams, eliminating gypsum byproduct formation while achieving high purity.

Copper compounds neutralize glyoxal in acrylic acid liquid phases to prevent unwanted radical polymerization.

Segmenting mother liquor recycling with a distillation side stream prevents multimeric impurity accumulation, stabilizing crystallization yield and purity.

Flocculant addition bridges the gap between recovered fluorocarbons and contaminants, resolving purity versus recovery rate contradictions.