Principle of rotary evaporators

Rotary evaporator is mainly used for continuous distillation of a large number of volatile solvents under reduced pressure Especially for the concentration of extraction liquid and the distillation of receiving liquid in chromatographic separation, the reaction products can be separated and purified The basic principle of rotary evaporator is vacuum distillation, that is, under the condition of vacuum, when solvent distillation, the distillation flask is rotating continuously Structure: the distillation flask is a pear shaped or round bottom flask with a standard grinding port It is connected with the pressure reducing pump through a high reflux serpentine condensate pipe, and another opening of the reflux condensate pipe is connected with the receiving flask with grinding port for receiving the evaporated organic solvent There is a three-way piston between the condensing pipe and the pressure reducing pump When the system is connected with the atmosphere, the distillation flask and the liquid receiving flask can be removed and the solvent can be transferred When the system is connected with the pressure reducing pump, the system should be in the pressure reducing state When using, reduce the pressure first, and then start the motor to rotate the distillation flask At the end, stop the machine first, and then open the atmosphere to prevent the distillation flask from falling off during the rotation As the heat source of distillation, it is often equipped with a corresponding constant temperature water tank With electronic control, the rotating evaporator makes the flask rotate at a constant speed to increase the evaporation area under the suitable speed of Zui The evaporation flask is kept in a negative pressure state by a vacuum pump The evaporation flask is placed in a water bath at the same time of rotation for constant temperature heating, and the solution in the flask is heated and diffused under negative pressure in the rotating flask for evaporation The rotary evaporator system can be sealed and reduced to 400-600mm Hg; the solvent in the distillation flask can be heated with a heating bath, and the heating temperature can be close to the boiling point of the solvent; at the same time, it can also be rotated at a speed of 50-160r / min, so that the solvent can form a film and increase the evaporation area In addition, under the action of the cooler, the hot steam can be liquefied rapidly and the evaporation rate can be accelerated Glass fiber: glass fiber is an inorganic non-metallic material with excellent performance The original English name is glass fiber The components are silica, alumina, calcium oxide, boron oxide, magnesium oxide, sodium oxide, etc It is made of glass ball or waste glass by high temperature melting, drawing, winding and weaving After Zui, a variety of products have been formed The diameter of glass fiber monofilament ranges from several microns to more than 20 microns, which is equivalent to 1 / 20-1 / 5 of a hair filament Each bundle of fiber raw filament is composed of hundreds or even thousands of monofilament It is generally used in various fields of national economy as reinforcement materials, electrical insulation materials, thermal insulation materials, circuit substrates, etc in composite materials Characteristics of glass fiber: the general idea of glass is that it is hard and fragile, and it is not suitable for structural material However, if it is drawn into silk, its strength will greatly increase and it has softness Therefore, it can finally become a good structural material after being given shape with resin The strength of glass fiber increases with the decrease of its diameter As a reinforcing material, glass fiber has the following characteristics, which make the use of glass fiber far more extensive than other kinds of fibers The development speed of glass fiber is also far away (2) high elastic coefficient and good rigidity (3) in the elastic limit, the elongation is large and the tensile strength is high, so the impact energy absorbed is large (4) it is an inorganic fiber with good chemical resistance and non flammability (5) low water absorption (6) good scale stability and heat resistance (7) it has good processability and can be used for products of different shapes such as strand, bundle, felt and weaving (8) transparent and light permeable (9) development of surface treatment agent with good adhesion to resin (10) low price Classification of glass fiber: according to form and length, glass fiber can be divided into continuous fiber, fixed length fiber and glass wool; according to glass composition, glass fiber can be divided into alkali free, chemical resistant, high alkali, medium alkali, high strength, high elastic modulus and alkali resistant glass fiber, etc Shangyu Star Instrument Equipment Co., Ltd is located in Daoxu Town, Shangyu District, Shaoxing City, Zhejiang Province It is an enterprise integrating production, product development, processing and trade The company's main products: drying box series, incubator series, laboratory muffle furnace series, distiller series, as well as clean workbench, air shower room, ventilation cabinet, biosafety cabinet and other complete sets of purification equipment The company has a strong technical research and development team, a strong after-sales service system, is the leading manufacturer of complete set of laboratory equipment in China, welcome customers to buy.