Sales of the core product, molecular-sieve pervaporation membranes, are made to the United States and the European Union.
Tetrahydrofuran
Background Art
Tetrahydrofuran is widely used as a solvent, a feedstock for organic synthesis, and a pharmaceutical solvent, for example in the preparation of Grignard reagents. During production and use, tetrahydrofuran can form an azeotropic mixture with water (containing 5.3% water), and dehydration recovery is typically achieved using desiccants—such as alkalis or hygroscopic salts. However, this approach is operationally complex, energy‑intensive, highly polluting, yields low product recoveries, and makes it 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-voltage tower: ≥0.4 |
| Steam consumption t/t of raw material |
0.32 |
0.3 |
1.5 |
| Consumption of circulating water (32°C): m 3 /raw material |
19 |
15 |
80 |
| Low-temperature water (15°C) consumption m 3 /raw material |
3 |
2 |
6 |
| Chilled water (-3°C) consumption m 3 /raw material |
18 |
- |
- |
| Electricity consumption kWh/t of raw material |
10 |
2 |
6 |
| Calcium chloride consumption per ton of raw material |
- |
170 |
- |
| Processing fee: yuan/ton of raw material |
97.3 |
236 |
325 |
| Operational complexity |
Continuous operation, high degree of automation, operated by a single person. |
Batch operation, high labor intensity, requires periodic cleaning of the tower and kettle. |
Continuous operation, with complex start-up and shutdown procedures and a heavy workload. |
| Security |
Self-controlled chain, safe |
Relatively safe |
The high-pressure tower operates at elevated pressure, and the tetrahydrofuran concentration in the tower bottom is relatively high, resulting in reduced safety. |
| Device Requirements |
No special requirements. |
Equipment and piping must be resistant to chloride-ion corrosion. |
High-pressure towers operate at elevated pressures, placing stringent demands on equipment and sealing. |
| Process drawbacks |
None |
Generates significant amounts of chlorine-containing waste liquids and residues. |
The start-up and shutdown procedures are complex, with low safety levels, large feed‑liquid circulation rates, and high energy consumption. |
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Email:info@9t-tech.com
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Website:http://www.9t-tech.com
Address: No. 6 Buyue Road, Pukou Economic Development Zone, Nanjing City
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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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