Significance of top and bottom temperatures in the methanol distillation pre-column
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What are the temperature parameters at the top and bottom of the methanol distillation pre-column, and what is their significance?
The temperature indicators at the top and bottom of the methanol distillation pre-column are 72’85; these values are used to remove light components without causing a decrease in the temperature in the methanol column, thereby facilitating the removal of those light components
We have an annual production capacity of 100,000 tons; the bottom pressure is 76 while the top pressure is 71, and the operation is very stable
The pre-tower is primarily used to remove the light components. The control of the temperatures at the top and bottom of the pre-tower determines the quality of the product as well as the amount of steam required. The temperature at the top is usually around 65, while that at the bottom is around 75
Pressure, temperature, and composition are interrelated; the top pressure in the methanol pre-tower should be kept as low as possible to ensure that low-boiling-point products are completely removed. Otherwise, it will be difficult to obtain high-quality methanol through the subsequent distillation process.
This issue is related to the type of tower used; the function of a pre-tower is primarily to remove light components. The temperature at the top of the tower is very important – a higher temperature enables better removal of these components, but it also leads to greater waste. If the temperature is too low, the light components are not removed completely. In most cases, decisions are made based on the type of tower, along with theoretical values obtained through simulation calculations; however, there are still some variations in actual operation. What type of towers are you?
The temperature difference between you is 10 degrees; what is the pressure difference?
Under different pressures, there are also different temperatures; when providing responses, it is necessary to include the pressures at the top and bottom of the column, as well as the temperature and the concentration of crude methanol, separately. Only in this way can there be comparability. Additionally, the type of tower and the number of trays are all related to the processing capacity of crude methanol.
In the methanol distillation pre-column, the top temperature should be maintained at 70–75°C, while the bottom temperature should be kept at 77–80°C. Controlling these temperatures is necessary in order to regulate the vent temperature of the condenser; the condensation temperature plays a key role in this process. Light components can only be removed in the ether removal column. Poor temperature control can result in the final methanol product not meeting quality standards.