Glass distillation towerDue to its transparent and corrosion-resistant material, it is widely used in laboratory experiments and fine chemical separation scenarios. However, glass has high brittleness and sealing requirements, and its installation quality directly affects the separation effect and experimental safety. The following are the core installation precautions to ensure stable operation of the equipment.
1、 Precautions for Preparation Before Installation
Site and environment confirmation
A flat and stable experimental platform should be selected, and the load-bearing capacity of the platform should match the overall weight of the distillation tower (including the tower body, condenser, receiving bottle, and materials) to prevent the platform from collapsing or the equipment from tipping over.
The installation environment should be well ventilated, away from open flames, high temperature heat sources, and strong vibration equipment (such as centrifuges and air compressors), while avoiding direct sunlight that can cause uneven heating of glass components.
Plan the positions of power and cooling water interfaces in advance to ensure that the pipeline and wiring are arranged neatly, without the risk of entanglement or compression.
Component inspection and cleaning
Inspect each glass component (tower body, distillation column, condenser, receiving bottle, etc.) one by one to confirm that there are no defects such as cracks, bubbles, scratches, etc. If there is any damage, it should be replaced immediately and forced use is strictly prohibited.
Check the firmness of metal connectors (fixtures, brackets, valves), ensure that the threads are not slipping and the fixtures are not deformed; Seals (rubber plugs, silicone gaskets) need to be free from aging and deformation to ensure sealing performance.
All glass components need to be cleaned with deionized water or specialized cleaning agents in advance to remove surface oil stains and dust. After drying, they can be assembled to avoid impurities affecting material purity and separation efficiency.
2、 Precautions for installation of tower body and support system
Verticality calibration
When installing the tower body, it is necessary to calibrate the verticality with a level and a plumb line to ensure that the tower body is perpendicular to the experimental platform, and the deviation should be controlled within 0.5 °. If the tower body tilts, it will cause uneven distribution of packing materials, insufficient gas-liquid contact, reduce distillation efficiency, and may also increase stress on glass components, leading to rupture.
The support bracket should be tightly attached to the tower body, and the tightness of the fixture should be moderate. If it is too loose, it may cause the tower body to shake, and if it is too tight, it may squeeze the glass and cause cracks.
Tower joint connection seal
The interfaces between each tower section should be aligned, and the sealing gasket should be accurately embedded in the sealing groove without deviation or wrinkles. When connecting, a small amount of vacuum silicone grease can be applied to the surface of the gasket (for high vacuum distillation) to enhance sealing.
For parts connected by clamps or grinding joints, the clamps should be tightened evenly or the grinding joints should be slowly rotated to avoid excessive local force that may cause the glass interface to crack.
3、 Precautions for installation of supporting components
condenser installation
The condenser needs to be precisely docked with the top interface of the tower body to ensure the smooth flow of the condenser pipeline; During installation, attention should be paid to the direction of the cooling water inlet and outlet (usually from bottom to top) to ensure that the condensation chamber is filled with cooling water and improve condensation efficiency.
The condenser bracket needs to be independently fixed to avoid its weight being entirely applied to the glass interface of the tower body, which may cause interface breakage.
Installation of heating and temperature control components
If water bath or oil bath heating is used, the heating device should be kept at a suitable distance from the tower kettle, and the liquid level of the heating medium should be slightly higher than the liquid level of the materials in the tower kettle. The heating device should be equipped with a precise temperature controller to prevent local overheating from causing the glass tower kettle to explode.
The electric heating sleeve should be selected with a model that matches the specifications of the tower kettle, and insulation gaskets should be laid to avoid uneven heating caused by direct contact between the tower kettle and the electric heating sleeve.
Installation of receiving and vacuum system
The receiving bottle needs to be connected to the condenser discharge port through an adapter, and the interface should be well sealed. At the same time, anti slip pads or brackets should be placed below the receiving bottle to prevent the material from tipping over when the bottle is full.
When it comes to vacuum distillation, negative pressure resistant silicone tubing or polytetrafluoroethylene tubing should be used for the vacuum pipeline, and buffer bottles and safety valves should be installed in the vacuum system to prevent backflow and damage to glass components; After installation, it is necessary to conduct an air tightness test to confirm that there is no air leakage before putting it into use.
4、 Precautions for installation of pipelines and auxiliary systems
Material and emptying pipeline
The material feeding pipe should be inserted into the tower kettle at a suitable depth to avoid impacting the kettle wall and causing glass damage during feeding; The venting pipeline should be led to a fume hood or outdoors to prevent volatile and toxic materials from leaking into the laboratory.
Electrical circuit layout
The circuits of temperature controllers, vacuum pumps, and other electrical appliances should be arranged separately from water pipes and material pipes, and insulated sleeves should be used to prevent water leakage and short circuits in the circuits; All electrical appliances must be well grounded to prevent static electricity or leakage from causing safety accidents.
5、 Precautions for commissioning and acceptance after installation
airtightness test
After installation, an overall airtightness test is required: close all discharge ports, introduce nitrogen or air from the inlet, slowly increase the pressure to 1.2 times the working pressure, hold the pressure for 30 minutes, and observe that the pressure gauge value does not decrease and there are no bubbles at each interface (soap water leak detection), which indicates that the airtightness is qualified.
No load trial operation
Introduce cooling water, turn on the heating and temperature control system, conduct a no-load temperature rise test, observe whether the temperature of each part of the tower is uniform, whether the condenser is condensing normally, and whether the temperature control is accurate. After there are no abnormalities, proceed with material distillation.
Safety protection acceptance
Confirm that the tower is equipped with protective nets or barriers to prevent glass breakage and splashing; Firefighting equipment, emergency eye wash stations, and protective gloves should be equipped near the experimental platform to cope with unexpected situations.