Carboxylic Acid Recovery
Sulzer GTC’s GT-CAR process is economical for any aqueous stream generated in the production of dimethyl terephthalate (DMT), purified terephthalic acid (PTA), pulp/paper, furfural, and other processes. Acids concentrations as low as 0.5-3.0% can be recovered economically. High purity formic acid or acetic acid are typical products.
In Sulzer GTC’s carboxylic acid recovery process, an acid-containing aqueous stream is fed to an extraction column, which operates using a proprietary, high boiling solvent which is selective to carboxylic acids. The acid-rich solvent stream is carried overhead from the extraction column for regeneration. In the two-stage regeneration step, surplus water is removed (dehydration) and the acids are recovered by acid stripping. The solvent is routed back to the extraction column for reuse. Final processing of the concentrated acids is determined on a plant-by-plant basis. The treated waste-water stream, containing acid levels on the order of < 2,000 ppm, exits the system to the plant’s wastewater treatment area.
- Up to 98% of the acids can be recovered
- Acids concentrations as low as 0.5% can be economically recovered
- Low capital investment results in typical ROI up to 40 %
- Modular systems approach means minimal disruption of plant operation and shorter project schedule
- Use of high-boiling solvent gives high acid recovery and substantial energy savings
- Solvent is easily separated from water, giving a solvent-free (<20 ppm) wastewater exit stream
- The carboxylic acid product purity allows for recycle or resale
- High acid recovery provides environmental benefits, unloading biological treatment systems
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