Author: MattiePetty

Original title: Collection-Gif of structure and principle of extraction equipment Poke the blue word. Principles of mechanical manufacturing "Pay attention to us!"! Extraction is a unit operation to separate liquid mixture according to the difference of solubility of each component in the solvent, commonly known as extraction. Extraction equipment — — Centrifugal extractor — — — — Mixer and settler extractor — — — — Pulsed Sieve Plate Column — — Expand the full text — — Sieve plate extraction column — — — — Reciprocating sieve plate extraction column — — Extraction equipment, also known as extractor, is used to realize mass transfer between two liquid phases. The basic requirement for the extraction equipment is that the two liquid phases of the extraction system can be fully mixed, closely contacted and accompanied by a high degree of turbulence; at the same time,nutsche filter dryer, the extraction phase and the raffinate phase after mass transfer can be perfectly separated. There are many types of extraction equipment. According to the contact mode of two phases, it can be divided into step-by-step contact type and continuous contact type. According to the power of forming dispersed phase,jacketed glass reactor, it can be divided into two types: without external energy and with external energy. The former only relies on the pressure when the liquid is fed into the equipment and the density difference between the two phases to disperse the liquid under the action of gravity, while the latter relies on external energy to disperse the liquid in different ways; In addition, according to the different power of two-phase countercurrent, it can be divided into gravity and centrifugal force. ① Rotary disc tower In the working section, hemp extraction centrifuge ,thin film distillation, a group of annular plates are installed at equal intervals to divide the working section into a series of small chambers, and a rotating disk is arranged in the center of each chamber to serve as a stirrer. These discs are mounted on a main shaft located in the center of the tower and are rotated by a mechanical device outside the tower. The rotating disc column is widely used in petroleum refining industry and petrochemical industry because of its simple structure, large capacity and high separation efficiency. ② Pulsating tower Set of sieve plates (without overflow pipe) or packing is installed in the working section. The pulsating liquid flow generated by the pulsating device is introduced into the bottom of the tower through a pipeline, so that the liquid in the whole tower is subjected to reciprocating pulsation. The high-speed relative motion of the pulsating liquid flow between the sieve plates or the packing produces a vortex, which promotes the fine and uniform distribution of the droplets. Pulsating column can achieve higher separation efficiency, but its processing capacity is smaller, so it is often used in nuclear fuel and rare element plants. ③ Vibrating plate tower The sieve plates are connected in a string and are driven by a mechanical device installed above the top of the tower to reciprocate in the vertical direction, thereby stirring the liquid flow and playing a stirring role similar to that in a pulse tower. The design of the extraction column is mainly to determine the diameter of the column and the height of the working section. The column diameter is calculated by dividing the liquid flow by the operating speed to obtain the column cross section. Then the height of the mass transfer unit and the number of mass transfer units are determined according to the characteristics of the tower, the properties of the material system and the separation requirements, and finally the working section height of the tower is obtained by multiplying the two. The height of the working section is also calculated according to the equivalent height and the theoretical progression. The special centrifuge for extraction can use centrifugal force to accelerate the sedimentation and stratification of droplets, so it allows intensified stirring to make the droplets fine, thus enhancing the extraction operation. There are two types of centrifugal extractors: fractional contact and differential contact. In the former, a stirring device is added to the centrifugal separator to form a single-stage or multi-stage centrifugal extractor, including a Luvesta-type centrifugal extractor and a cylinder-type centrifugal extractor. The drum of the latter is equipped with multiple layers of concentric cylinders, and the wall of the cylinder is perforated,wiped film distillation, so that the liquid can be dispersed in both film and drop forms, such as the Podbirnike centrifugal extractor. The centrifugal extractor is especially suitable for the system with small density difference between the two phases or easy emulsification. Because the residence time of the material in the extractor is very short, it is also suitable for the extraction of substances with unstable chemical and physical properties. Return to Sohu to see more Responsible Editor:.