Acetonitrile
Project Background
Acetonitrile is an important organic chemical raw material, which is widely used as a solvent or reactant. It is often necessary to separate acetonitrile from water in the process of solvent production or reuse. Due to the azeotropic of acetonitrile and water, the azeotropic point at atmospheric pressure is 76.3 ℃, of which the mass of acetonitrile is 84%, which cannot be achieved by ordinary distillation. The current separation methods are mainly (salt) extractive distillation, pressure swing distillation and membrane pervaporation dehydration.
Technical comparison
| Name |
membrane separation |
pressure swing distillation |
| Steam (t/t feedstock) |
1.2 |
2.5 |
| Circulating water (m3/t raw material) |
50 |
250 |
| Low temperature water (m3/t raw material) |
4 |
20 |
| Chilled water (m3/t raw material) |
5 |
0 |
| Electricity (kWh/t raw material) |
30 |
20 |
| Operating cost (yuan/t raw material) |
287 |
580 |
| Yield (%) |
High, ≥ 97 |
Low, 90-93 |
| Number of distillation columns (unit) |
1 |
2 |
| Maximum operating pressure (MPa(G)) |
0.2 |
0.3~0.4 |
| Required steam pressure (MPa(G)) |
≥0.4 |
0.6~0.7 |
| operation complexity |
Simple, automatic control |
Complex, multiplayer operation |
| Equipment investment |
relatively high |
Low |
| Annual operating cost (based on 10m ³ per day and annual output of 250 days, I .e. 2000 tons/year) |
Energy saving 600000 yuan; Yield improvement savings> 800000 yuan/year (based on acetonitrile 10000 yuan/ton), total savings greater than 1.4 million yuan/year |
|
| Process selection |
Recommend |
Not recommend |
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