Roto vape is suitable for reflux operation, rapid evaporation of a large number of solvents, concentration of trace components, and reaction processes that require stirring. Before the rotary evaporator starts, all process pipes and equipment that have passed the installation and inspection must be purged and cleaned (hereinafter collectively referred to as purge). But usually include the following methods: water washing, air purging, pickling passivation, oil cleaning and degreasing. Next, ZZKD rotary evaporator manufacturers introduce you to their main features and scope of use.

1, water rinse

Water flushing is a method of rinsing pipes and equipment under pressure by using water as a medium. It is widely used in the removal of residual dirt inside pipelines, towers, tanks and other equipment used to transport liquid media. The water flushing pipeline should be carried out with a large flow rate or a flow rate of not less than 1.5m / s that is possible in the pipe (this does not include high-pressure, ultra-high-pressure water jet cleaning equipment, pipe car internal and external surface scale methods). General chemical equipment Rotary evaporator, pipeline rinsing is commonly used for clarified water with turbidity less than 10 * 106, and nitrogen content of rotary evaporator is less than 100 * 106. To prevent the accumulation of chloride ions (CI-) on the rotary evaporator and stress corrosion cracking (SCC) of equipment, pipes, etc., it is necessary to rinse with deionized water. Water washing has the characteristics of convenient operation and no noise.

2, air purging

Air purging is a method of blowing out the remaining dirt and debris from the pipelines conveying gaseous media after air is pressurized by the compressor (usually 0.6-0.8MPa). Adopt air purge. There should be sufficient air volume, so that the flow velocity of the purge gas is greater than the normal operation gas flow rate, generally lower than 20m / s. Rotate the evaporator to make it have enough energy (or momentum) to purge. Residual deposits in pipes and equipment are ensured to ensure smooth commissioning and safe production of the device. Air consumption during air purge is generally large, and a certain purge time is required. Therefore, air purging is usually provided by air operation using a larger air compressor in the device or a large compressor (such as a cracking gas compressor in an ethylene device) using the device that can compress air. For small and medium-sized chemical plants that lack a large amount of continuous purge air, a segmental purge method can also be adopted, that is, the system pipeline is divided into many sections, each section is divided into several sections, and then the section is purged step by step. Isolate a period. In the case of a small amount of gas source, the rotary evaporator can ensure the purge quality. For large-diameter pipes or pipes that are not easy to blow off, blasting can also be used. Do not use oil-free air to purge oil pipes and instrument air pipes. Nitrogen is generally not used as a purge gas source for ordinary pipelines and equipment due to its source and cost. It is often used for air purge and system air drying benches, and the protection and replacement of pipelines and equipment.

3.Steam purge

Steam purge is the purge of steam with different parameters as the medium. It is provided by the steam generator. Does steam purge have a high purge speed, and therefore has a large amount of energy (or momentum) (or momentum). The intermittent steam purging mode also causes the pipeline to produce "cold heat and heat shrinkage and expansion, which is conducive to the stripping and blowing of the attachments on the inner wall of the pipeline, so it can achieve a better purging effect. The steam pipeline should be steam purged. It is also necessary for power steam pipelines. When the power steam pipeline is purged, not only should the dirt and debris in the pipeline be thoroughly purged, but also the rust on the metal surface should be blown away, because once they are entrained in high-speed steam, During the flow, it will cause great damage to the high-speed rotating turbine blades, nozzles, etc. The steam purge temperature is high, the pressure is high, and the flow velocity is fast. When the pipe is heated, it will expand and displace, and it will shrink after cooling. All are equipped with compensators, traps, pipe supports and hangers, slideways, etc. The need for expansion and displacement is also considered. If non-steam pipes are not cleaned with air, they can also be cleaned with steam, but they should be considered. Whether the structure can withstand the effects of high temperature and thermal expansion and contraction, and take necessary measures to ensure the safety of people and equipment during blowing.