Ethanol
Background technology
Ethanol is widely used in energy, chemical, pharmaceutical and other industries, because of the existence of the lowest constant boiling point of ethanol-water system, so the use of ordinary methods of distillation of ethanol, its content will not be greater than 95.57, must be switched to other methods to further separation of anhydrous ethanol. The traditional azeotropic distillation and extractive distillation have formed a large-scale and highly mechanized anhydrous alcohol production process, but the energy consumption is high, and the entrainer or extractant will cause environmental pollution when the production is not operated properly.
Technical comparison
| Project |
Unit price (CNY) |
ethylene glycol extractive distillation |
inorganic pervaporation membrane |
||
| unit consumption |
unit consumption cost/yuan |
unit consumption |
unit consumption cost/yuan |
||
| Extractant/(t · t-1) |
8000 |
0.33*10-3 |
2.64 |
-- |
-- |
| Electricity (kwh · t-1） |
1.0 |
7.9 |
7.9 |
19.9 |
19.9 |
| Steam/(t · t-1) |
200 |
1.2 |
276.0 |
0.48 |
96.0 |
| Water/(m3·t-1) |
0.2 |
107.0 |
21.4 |
38.0 |
7.6 |
| Total |
-- |
-- |
307.9 |
-- |
123.5 |
Characteristics of membrane technology
★High efficiency and energy saving can save more than 30 ~ 50% of energy compared with traditional distillation and adsorption technology;
★The high recovery rate is not less than 97%, and the recovery and utilization of permeate can reach more than 99%;
★Environmental friendliness does not require the introduction of a third component, while the permeate can be recovered and recycled;
★Simple operation through the PLC for production process control, the use of HMI for real-time monitoring, high degree of automation;
★Small floor space, easy installation and maintenance, low equipment height, modular design, simple installation and maintenance, no civil engineering requirements;
★Compared with organic membranes, the membrane has high flux, high separation coefficient, resistance to organic solvents, non-swelling and long membrane life.
|
|
GFT |
Nine Days High Tech |
| Processing capacity |
1200 kg/h |
|
| product purity |
99.2% |
99.6% |
| Water content of permeate |
90% |
98% |
| Stability |
Frequent membrane breakage |
stable operation |
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