#rootspump

  Pfeiffer Vacuum will be presenting innovative vacuum solutions at the trade fair. This year, particular attention will be focused on vacuum generation in potentially explosive environments and on the evacuation of explosive gases. Wherever combustible dusts, gases or vapors are used, or can develop, there is always a danger of explosion. To ensure the protection of people working in potentially explosive atmospheres, the vacuum pumps used in these areas must be safe and free of ignition sources. Here, the Okta Atex Roots pumps and HiScroll Atex scroll pumps from Pfeiffer Vacuum offer the ideal solution. Explosion-proof Okta Atex Roots pumps

Explosion protection and operational safety with Okta Atex Roots pumps Since they are designed in accordance with the European Atex Directive (2014/34/EU and/or 1999/92/EC) and have a pressure surge resistance of PN 16, the Okta Atex Roots pumps meet the very highest explosion-protection requirements. Due to the hermetically sealed magnetic coupling on the drive shaft, there is no risk of zone entrainment. Potential applications range from the chemical, biotechnological and pharmaceutical industries to industrial applications such as vacuum furnaces or heat treatment. Depending on the application, there is a choice between equipment category 2G or 3G. All the vacuum pumps are suitable for temperature class T3. The Okta is suitable for universal use thanks to its variable differential pressure and broad range of rotational speeds. All versions of the pump can be used at ambient temperatures ranging from -20 °C to +40 °C. The magnetic couplings, are hermetically sealed and achieve extremely low leak rates of 10-6 Pa m3/s. This eliminates the need for shaft seals, which are high-maintenance and represent weak spots if pressure surges occur. Compared to pumps with shaft seals, the Okta’s magnetic coupling reduces operating costs by up to 20% and requires considerably less maintenance. Explosion-proof HiScroll Atex scroll pumps

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  VTA vacuum distillation plant (Source: VTA) The boiling point of many organic substances at atmospheric pressure lies within a temperature range from 200 to 400 °C. The separation of such mixtures therefore requires a high energy input at atmospheric pressure. Thermal decomposition of the mixtures can also occur in many cases at these temperatures. Reducing the pressure into the low and medium vacuum range significantly reduces the boiling temperatures. In the case of monoglyceride, for example, which is used as an emulsifier, the boiling point is reduced from 300 °C at atmospheric pressure to about 220 °C at a pressure of However, for the separation of mono-, di- and triglycerides,  for example, pressures in the range of 0.01 hPa are required. In this case, the so-called short-path distillation method is used. The condenser is located at the center of the cylindrical vaporizer and the distances between the hot wall and the water-cooled pipe coil are in the range of a few centimetres, depending on the size of the device. Pressure losses are minimized, since the material to be evaporated condenses directly on the cold surface. Since the mean free path of a molecule in a medium vacuum is in the range of the distance between the cylinder and the internal condenser, or is significantly greater, this method is also referred to as molecular distillation. If the vapor pressures of the substances to be separated are very close to each other, vacuum rectification columns are used. In these counter-current distillation systems, the vapor flows through a vertically aligned column to the condensed liquid. Installations such as structured packings ensure good mixing of the two phases so that a phase equilibrium can be achieved. Dwell times and pressure levels are higher than with thin film vaporizers, however. The two processes are often combined.

Three- stage pumping station for distillation processes Roots pumping stations for thin-film and short-path distillation. Maintaining the exact vacuum pressure required in the vaporizer is vitally important for the quality of the separation pro- cess and imposes big demands on the vacuum control system and the quality of the vacuum pumps used. Pfeiffer Vacuum therefore offers Roots pumping stations with liquid ring pumps as proven solution. Depending on the number of Roots piston stages, a pressure of 10-3 hPa can be reached without great effort. It is also possible to operate the liquid ring pump with the substance that needs to be distilled. One example is the processing of rolling oil. The oil contaminated by the rolling operation is reprocessed through distillation. For this, three-stage Roots pumping stations consisting of two Roots pumps and a liquid ring pump are used. The rolling oil to be distilled serves as the operating liquid for the liquid ring pump. At a pressure of approximately 5 hPa, the rolling oil evaporates and is condensed in the downstream condenser. The possibility of leakage air saturated with oil vapors being sucked into the vacuum pump system, where the oil vapors can then condense again in the liquid ring pump, cannot be completely ruled out, however. But if the rolling oil is used as the operating liquid, this will not negatively affect the through- put of the pump. The level of the liquid in the circulatory container of the liquid ring pump rises slowly. When the maximum permitted level is reached, the operating liquid is automatically discharged and fed to a suitable treatment process. Depending on the application, dry backing pumps can also be used instead of the liquid ring pump. Vacuum solutions for vacuum distillation