Crude methanol rectification process includes single-column process, two-column process, three -column process and energy-saving three-column process. The feature of Four processes are as follows:
|No.||Crude methanol rectification process||Feature|
|1||single-column process||1.Methonal-water regroup, separate in one column|
2.Advatange: investment saving, reduce heat energy consumption
3.Disadvantage: the purity of refined methonal is not very pure.
|2||two-column process||1.The combination of pre-recification column and main rectification column|
2.Refine crude methonol including dimethyl ether and other light components and reducing impurities
3.Advantage: simple process ,user friendly, less investment
4.Disadvange: high energy consumption, low purity
|3||three -column process||1.Three rectification column work under the same pressure. The third rectification column produces|
2.Advantage: high purity
3.Disadvantage: high investment. Need more area
|4||energy-saving three-column process||1.Two main rectification columns and final rectification column, the first main rectification column is pressure-increasing column. The second one is normal pressure column. Two columes produce 50%-50%|
2.Advantage: envery saving, reduce the ethanol content of the purified methanol, product quality is better; methanol yield is higher, low operating costs
3.Disadvantage: high one-time investment
Our company's crude methanol distillation technology is based on the fourth energy-saving three-tower process, the main feature is to fully optimize the heat transfer network, so that the use of steam and circulating water to a minimum, in order to achieve energy conservation and investment optimization.
(1) High yield of the process: fine methanol recovery rate of 99.86% (refined methanol production and feed the amount of methanol contained in the ratio)
(2) Using a mature double-effect distillation method: the use of pressurized overhead gas phase for the atmospheric tower reboiler heat source.
To 300,000 tons / year 90.82% methanol distillation as an example.
1. Processing capacity: 300,000 tons / year Processing capacity: 300,000 tons / year
2. Operating time: 8000 hours operating hours 8000 hours
3. Operational flexibility: 60% -120% Operating flexibility
4. Raw material
|11||normal propyl alcohol||ppm||40|
Methanol product quality is in line with the People's Republic of China national standard "industrial methanol" (GB338-2004) excellent products and industrial methanol US Federal Standard (O-M-232G) "AA" level
5. Utility consumption (to produce per ton of refined methanol)
|2||recycling cooling water||32℃~40℃||m3||48|