Life cycle assessment of solvent extraction as a low-energy alternative to distillation for recovery of N-methyl-2-pyrrolidone from process waste

Green Processing and Synthesis - Tập 7 Số 4 - Trang 277-286 - 2018
Paul V. Tozzi1, Christian M. Wisniewski1, Nicholas J. Zalewski1, Mariano Savelski1, C. Stewart Slater1, Frank A. Richetti2
1Department of Chemical Engineering, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, USA
2DuPont Corporation, 250 Cheesequake Road, Parlin, NJ 08859, USA

Tóm tắt

Abstract This case study investigates low-energy alternatives to distillation for the recovery of N-methyl-2-pyrrolidone (NMP) from solvent waste in the manufacture of resin precursors. Evaluation includes environmental and economic life cycle assessment of solvent recovery and reuse using batch distillation, solvent extraction, and solvent extraction at a sister plant. Solvent extraction at the sister plant involved shipment of hazardous waste to a facility with existing solvent recovery equipment and lower purity standards for NMP. The amount of processing required to recover useful NMP is reduced, increasing reductions in life cycle emissions and damages to the environment. Extraction at the sister plant recovered 98% of the NMP at a purity of 97.1 wt% from aqueous waste containing 17 wt% NMP. Extraction at the sister plant reduced total and CO2 life cycle emissions by 61% and 59%, respectively. Compared to the distillation recovery alternative, extraction at the sister plant results in reductions of 32% and 33% for total and CO2 life cycle emissions, respectively. Annual operating costs were reduced by 80%, with no capital investment, due to utilization of existing equipment. This resulted in a 10-year net present value (NPV) of $4.20 million, whereas distillation resulted in a 10-year NPV of $3.12 million.

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Green Processing and Synthesis

Tập 7 Số 4

277-286

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