Sales of the core product, molecular-sieve pervaporation membranes, are made to the United States and the European Union.
Fuel ethanol
Anhydrous ethanol is widely used in the food, chemical, fuel, defense, and pharmaceutical industries. Ethanol produced via biomass fermentation typically has a concentration of 3–20 wt%; after conventional distillation removes most of the water, aldehydes, and fusel oils, the resulting ethanol can reach a maximum concentration of 95%, at which point it forms an azeotrope with water, making separation by ordinary distillation extremely difficult. To obtain anhydrous ethanol, the aforementioned ethanol must undergo further dehydration treatment.
Most of the preheated feed is introduced at the top of the tower as reflux, and the high-pressure column (250 kPa(g)) operates in a stripping mode to discharge vapor-phase product, while wastewater is drawn from the bottom. The ethanol recovered from the high-pressure column enters the medium-pressure column (200 kPa(g)) for rectification; the overhead stream, containing approximately 15 wt.% water, is fed to the membrane unit, and wastewater is discharged from the bottom. Meanwhile, a small portion of the preheated feed is mixed with the permeate and sent to the low-pressure column (−50 kPa(g)) for further rectification. The overhead product, with an ethanol concentration of about 25 wt.%, is returned to the top of the medium-pressure column as reflux, and wastewater is discharged from the bottom.
Process Advantages
1. The high-pressure column employs a stripping configuration, eliminating the need for additional condensation and reflux, thereby reducing energy consumption. Moreover, the vapor-phase product is directly fed into the medium-pressure column, thus avoiding the substantial pressure differential between the medium- and high-pressure columns that would otherwise result from coupled heating.
2. The low-pressure column, serving as the concentration column, concentrates the ethanol feedstock and returns it as reflux to the medium-pressure column. By leveraging the economic advantages of vacuum distillation, it further reduces the thermal load on the medium-pressure column, while the heating load of the low-pressure column is supplied by the overhead condenser of the medium-pressure column.
3. The vapor-phase product drawn from the high-pressure column is directly fed into the medium-pressure column for rectification, significantly reducing the medium-pressure column’s thermal load and enhancing heat utilization efficiency.
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The data presented on this website are partly derived from the company’s internal statistics and customer feedback and are provided for reference only. For specific product performance and applicability, please refer to the contract and technical agreement signed by both parties.
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