Extraction and distillation device
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Extraction and distillation device
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Definition
Add a third component (called an extractant or solvent) to the raw material liquid to change the relative volatility between the original components and achieve separation. Unlike azeotropic distillation, the extractant does not form azeotropes with any components in the raw material liquid.
The operational characteristics of extraction distillation: In order to increase the relative volatility of the separated components, sufficient concentration of additives should be maintained in the liquid phase of each plate. When the raw materials and extraction solvents are added to the tower in a certain proportion, there must be an optimal reflux ratio. When the reflux without additives is too large, it not only fails to increase the composition of the distillate, but also reduces the concentration of additives in the tower, making separation more difficult. Similarly, when the reflux temperature at the top of the tower is too low or the temperature of adding additives is too low, it will cause partial condensation of the steam inside the tower and dilute the concentration of additives in each plate.
In design, in order to make the additive concentrations in the distillation and extraction sections roughly similar, the feed liquid of extraction distillation is often added to the tower in a saturated steam state. If the additive concentration is different between the distillation section and the distillation section for adding materials to the boiling point, different phase equilibrium data should be used for calculation.
Product Overview
The extraction distillation experimental device is mainly used for laboratory small-scale and pilot scale research and simulation. The equipment material of the small-scale continuous device is mainly glass material, which is easy to observe during the experimental process and can meet the operating conditions of normal/reduced pressure. However, the glass device is not pressure resistant and the equipment is prone to damage, so the small-scale device can also be made of stainless steel material; Due to the increased processing capacity of the pilot plant, all equipment materials are made of stainless steel.
The main body of the equipment is composed of important parts such as raw material tank, extractant tank, preheater, tower kettle reboiler, distillation tower, condenser, reflux ratio/reflux tank, tower top receiving tank, tower bottom receiving tank, feed pump, tower top extraction pump, tower kettle extraction pump, valves and pipelines, control system, vacuum system, etc. This system has normal pressure or pressure reduction operation, and the sealing requirements of the entire device are relatively high during the pressure reduction operation. During the experimental operation, pressure fluctuations will affect the stability of the entire experiment. Therefore, all the equipment connection parts of the system are connected by flanges and sealed with PTFE gaskets.
The control system of this device adopts PLC integrated control. The automatic control system can achieve precise control and system stability of pressure, temperature, and flow by viewing the process interface, browsing and viewing stored historical process data, and accessing various process parameter curves. It is equipped with multi-level key protection systems and ensures the safety of the device and operators through some safety interlock designs.
The design goal is to establish a high-quality and high-level testing device installation platform for customers. The overall level of the device requires a high degree of automation, good data accuracy and repeatability, easy operation, safety and reliability, and the ability to operate stably for a long period of time.
Technical Parameters
Equipment materials: high borosilicate glass 3.3, 316L stainless steel, titanium alloy, Hastelloy alloy, fluorine lining.
Tower diameter: DN32, DN40, DN50, DN80, DN100, etc. The specific specifications are subject to the process calculation results;
Tower height: There are four specifications for glass distillation towers: 500mm, 700mm, 1000mm, 1300mm, etc. They can be combined according to theoretical board requirements, or customized according to ASPEN calculations based on physical properties and separation requirements; Packing: 3mm/4mm/5mm θ ring metal wire mesh packing, triangular spiral packing, glass spring packing, PTFE ball ring, regular packing, etc.
Tower kettle design temperature: normal temperature~200 ℃ (high borosilicate glass), normal temperature~300 ℃ (stainless steel)
Design pressure: -1 bar to+0.5 bar (high borosilicate glass), -1 bar to 5 bar (stainless steel).
Processing capacity: 0.5kg/h~10kg/h, can be designed according to customer requirements.
Reflux method: liquid level difference reflux/forced reflux. The liquid level difference reflux is controlled by a reflux ratio distributor (ASK patented product), with a reflux ratio adjustment range of 1:99/99:1; Reflux tank+pump can also be used for control to achieve reflux ratio adjustment.
Control system: PLC integrated control, realizing temperature, pressure, reflux ratio, flow rate, liquid level, mixing speed control and real-time data acquisition.
Optional:
Vacuum system, heating cycle unit, refrigeration cycle unit, high and low temperature integrated machine: domestic/imported for customers to choose from.
The above parameters are for reference only, and specific technical requirements can be customized according to customer needs.
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