Tetrahydrofuran
Background technology
Tetrahydrofuran is widely used as a solvent, raw materials for organic synthesis and pharmaceutical solvents, such as the preparation of format reagents. Tetrahydrofuran can form an azeotropic mixture with water (water content 5.3%) in the process of production and use. Desiccant is generally used for dehydration recovery (such as alkali addition and salt absorption). The operation is complicated, the energy consumption is high, the pollution is serious, the yield is low, and it is difficult to obtain high purity solvent.
Technical comparison
|
|
membrane dehydration |
calcium chloride dehydration |
pressure swing distillation |
| Number of distillation columns |
0 |
1~3 |
2 |
| Operating pressure MPa(G) |
0.15~0.25 |
Atmospheric pressure |
High pressure tower: ≥ 0.4 |
| Steam consumption t/t Raw material |
0.32 |
0.3 |
1.5 |
| Circulating water (32 ℃) consumption m3/t/raw material |
19 |
15 |
80 |
| Low temperature water (15 ℃) consumption m3/t/raw material |
3 |
2 |
6 |
| Chilled water (-3 ℃) consumption m3/t/raw material |
18 |
- |
- |
| Power consumption kWh/t Raw material |
10 |
2 |
6 |
| Calcium chloride consumption yuan/t raw material |
- |
170 |
- |
| Processing cost CNY/t raw material |
97.3 |
236 |
325 |
| operation complexity |
Continuous operation, high degree of automation, one person operation |
Intermittent operation, labor intensity, need to clean the tower kettle regularly. |
Continuous operation, complex start and stop process, heavy workload |
| Security |
Automatic control chain, safety |
Safer |
High pressure tower pressure is higher, and the tower kettle tetrahydrofuran concentration is higher, the safety is low. |
| Equipment Requirements |
No special requirements |
Equipment and piping shall be resistant to chloride ion corrosion |
High pressure tower operating pressure, high requirements for equipment and sealing |
| Process Disadvantages |
None |
More chlorine-containing waste liquid and waste residue are produced. |
The start-up and stop process is complex, the safety is low, the material liquid circulation is large, and the energy consumption is high. |
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