Three-mouth flask is a common chemical glass instrument, which is widely used in organic chemistry experiments.
The three-neck flask usually has the appearance of a round belly and a thin neck. It has three openings, and you can add multiple reactants at the same time, or you can add condensing tubes. Its narrow opening is used to prevent the solution from splashing or reducing the evaporation of the solution, and can be used with rubber plug, to connect other glass equipment. A flask is usually used when a solution needs to be reacted for a long time or when it is heated for reflux. The opening of the flask does not protrude like a beaker, so the solution is more likely to flow down the outside of the flask when poured, so a glass rod is often used to touch the top of the flask to prevent the solution from flowing down the outside. Because the mouth of the flask is very narrow, it is not suitable for glass rod mixing. If you need to stir, you can hold the mouth of the bottle and turn your wrist slightly to stir smoothly and evenly, or use a special mixer. When reflux is heated, a magnetic agitator can be placed in the bottle to stir with a heated agitator
(1) if the use of open fire heating, should be placed on the asbestos net heating, so that it is heated evenly; When heating, the outer wall of the flask should be free of water droplets.
(2) pay attention to the sealing of the frosted interface when using.
The main purpose
(1) Reactor between liquid and solid or liquid.
(2) Assembly of gas reaction generator (normal temperature, heating).
(3) distillation or fractionation of liquids (with branched flasks also known as distillation flasks).
(4) For organic reactions with strict conditions.
Points for Attention in Use
(1) The liquid injected shall not exceed 2/3 of its volume.
(2) the use of asbestos net when heating, so that the uniform heat.
(3) distillation or fractionation should be used with rubber plug, catheter, condenser, etc.
Modeling and production
The production of three-mouth flask and multi-mouth flask is made by blowing the flask body with the mold of short-neck and thick mouth flask on the big furnace, and then welding the shoulder of each flask body on the lamp maker. Multi – mouth flask is a short neck, thick mouth, round bottom flask, in the bottle body around the shoulder welded with three (three neck), four (four neck) flask. The Angle of the neck is divided into straight neck and torticollis. Multi-port, mainly to cooperate with the complex experimental operation, can assemble more supporting instruments at the same time. Straightness mouth, because all kinds of accessories are vertical devices, the bottle center gap is large, easy to stir the solution, not easy to damage other parts of the instrument and design, but its disadvantage is that the ball area is small, the bottleneck between the close, it is not easy to install other instrument parts, especially the specifications below 500mL is more difficult. Bevel, due to the existence of a bevel Angle (10° bevel or 2 expansion Angle), feeding can be directly and evenly added to the bottom of the bottle center. The surface of the bottle body is also obtuse for the assembly of various equipment accessories. Because of the large shoulder gap and the large distance between the mouth and neck of the bottle, it is easy to install, especially the small size flask. But the center of the bottom of the bottle space is less, it is difficult to stir, easy to damage other accessories and instruments.
Method of use
It is basically the same as the round-bottom flask, but because of its thick mouth, short neck and many mouth, the installation accessories can be increased, and the installation is labor-saving and convenient. Under normal circumstances, the mixing bar is installed in the middle of the mouth, a liquid distributing funnel is installed in the side mouth, a fractionation tube and condensing tube are installed in the side mouth, and a thermometer is installed in the side mouth.
It is suitable for the synthesis of organic substances in the laboratory, or for the more complex boiling, fractionation and purification operations. It is often assembled into a fractionation device, distillation device or reflux device with thermometers, condensing tubes, stirring bars, liquid funnel and other instruments. 250-3000ml is used for constant analysis and 5000-10000ml is used for industrial small batch production.
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Post time: Jun-11-2021