In the post-treatment process of pharmaceuticals, pesticides, explosives, dyes, pigments, and other fine chemical production processes, there are often unit operations such as filtration, washing, and drying. These unit operations are usually composed of unit equipment such as centrifugal filters, washing tanks, and dryers. It operates independently, and the equipment is transported through pipelines or other methods. Multiple units of equipment are connected into a system of large devices, long processes, low efficiency, and difficult to adjust the production process. For suspensions with high solid content, solids often stick to the wall and block the pipeline, making it difficult to carry out normal production. Adopting open production, although it is convenient to deal with the problem of blockage, it is difficult to meet the requirements of GMP regulations for medicine, food, biological products, etc., and there are still potential safety hazards for flammable, explosive, toxic or highly toxic materials.
In order to overcome the problems and deficiencies in the above-mentioned unit equipment combination, and at the same time meet the transformation of the chemical industry to high-quality, high-value-added, multi-variety, and small-batch, Wuxi ZhangHua Mechanical Engineer finally developed Integrating filtration, washing and drying into one multifunctional vertical fixed cylinder conical filter washing and drying three-in-one. The cylindrical conical filter, washing and drying three-in-one has three main functions of filtration, washing and drying, so it is collectively called filter dryer, commonly known as "three-in-one"; at the same time, it also has the functions of reaction, extraction, crystallization, washing, concentration, evaporation, It has multiple functions such as mixing and crushing, so it is also called a multi-function machine.
Vertical fixed cylinder conical filter washing and drying three-in-one structure and working principle
The upper part of the fixed cylinder conical filter dryer is cylindrical, and the lower part is conical, so it is called cylindrical cone.
Both the upper cylinder and the lower cone have a double-layer jacket structure: the inner jacket is the filtrate channel, and small holes are opened on the inner wall, and the inner wall is followed by filter cloth and filter screen (composite orifice mesh), and the filtrate passes through the filter screen, The filter cloth and the inner wall of the inner jacket first enter the inner jacket, and then flow out through the outlet of the filtrate; the outer jacket is a hot or cold medium channel for heating or cooling. The driving device is installed on the top of the container, and the middle transmission shaft of the equipment is equipped with a spiral scraper, a stirring paddle and a pushing screw. The driving device can be rotated forward or reversed to lift or push down the material.
Specific operation process: feeding, first put the material into the equipment from the top feeding port; filter, open the filtrate outlet, and filter the material by vacuuming the filtrate outlet or applying compressed air on the top of the equipment; washing, suspending filtration, washing Add solvent from the top, wash under stirring, continue to filter after washing; dry, pass heat medium into all the above-mentioned hollow rotating parts and outer jackets, heat the materials, and vacuumize at the top of the equipment at the same time, Vacuum-dry the material; unload, open the quick-opening discharge valve at the lower part, make the driving mechanism rotate in the opposite direction, and the pushing screw will automatically push the dried material out of the machine.
Vertical fixed cylinder conical filter washing and drying three-in-one process flow
1. Stirring reaction
Add the material (solid-liquid, liquid-liquid or gas-liquid) that needs to be reacted from the feeding port on the top of the equipment, start the motor and reducer, and make the hollow shaft and the hollow ribbon rotate clockwise (looking down from the top). The unique stirring structure can make the materials fully stirred and fully reacted in the machine. If the materials are to be heated or cooled during the reaction, heat medium or refrigerant can be introduced into the cylinder and the cone jacket, as well as the hollow shaft and the hollow spiral belt.
The heating or cooling medium can be continuously circulated to complete the heating or cooling of the material to meet the process conditions required for the reaction.
After the reaction is over, open the outlet of the lower filtrate, pass compressed air or nitrogen gas into the equipment, and filter the reacted solid-liquid mixture under pressure until the materials in the machine are dried. Vacuum can also be drawn at the outlet of the filtrate to vacuum filter the material until the filtrate is drained.
When filtering, the hollow shaft and the hollow screw belt can be rotated clockwise (viewed from the top) to lift the material, and the hollow screw belt can limit the thickness of the filter cake layer when rotating, so that the material is in a thin filter cake Filter under layer conditions to increase the filtration rate. For materials that are easy to filter, it is not necessary to stir when filtering, and the materials are directly filtered to dryness.
Washing materials in the above method is called batch washing method. Since the material is pressed dry and then washed with washing liquid, although the valves are opened and closed a little more times during operation, less washing liquid is used. The machine can also continuously wash the materials, that is, continuously press the washing liquid with a pump or other methods, and use the pressure of the washing liquid to filter, while the hollow shaft and the hollow ribbon are continuously stirred, and the filtrate is continuously discharged from the filtrate outlet until Until the washing requirements are met, the filter cake is finally pressed dry.
This continuous washing method generally uses more washing liquid than intermittent washing, but it is more convenient to operate.
The three-in-one vertical fixed cylinder, conical filter, washing and drying is a fully enclosed structure, intermittent operation, vacuum filtration and heating and drying are used to remove solvents, especially suitable for dealing with flammable, explosive, toxic or highly toxic dangerous products, valuable products , as well as delicacy food, biological products and medicines that are not allowed to be contaminated.