The rectification tower is a tower type gas-liquid contact device for rectification. Using the different volatility of each component in the mixture, that is, at the same temperature, the vapor pressure of each component is different, so that the light components (low boilers) in the liquid phase are transferred to the gas phase, while the Heavy components (high boilers) are transferred to the liquid phase to achieve the purpose of separation. Distillation tower is also a kind of mass and heat transfer device that is extremely widely used in petrochemical production. Let's take a brief look at it with the small editor of distillation tower design.
Whether it is balanced distillation or simple distillation, although it can have a certain separation effect, it cannot separate a mixture into a certain amount of high-purity products. In petrochemical production, it is often required to obtain high-purity products, and this high-purity product can be obtained through the rectification process.
The equipment used in the rectification process is called a rectification tower. The design of the rectification tower can be roughly divided into two categories: ①The plate tower, the gas-liquid two phases are in general countercurrent contact for many times, and the gas-liquid two-phase on each layer is generally Make cross flow. ② In the packed tower, the two phases of gas and liquid are in continuous countercurrent contact. The general rectification device is composed of rectification tower body, condenser, reflux tank, and reboiler. The feed material enters the tower from a certain section of the rectification tower, and this tray is called the feed plate. The feed plate divides the rectifying tower into two upper and lower sections. The part above the feed plate is called the rectification section, and the part below the feed plate is called the stripping section.