Vacuum pumps have to be oil sealed? Think again! With changing times, pumping technology has also evolved and advanced. Dry vacuum technology is a result of such advancement. Along with the ease in operation, these new pumps offer lower maintenance and higher safety.
For decades vacuum pumps have been used for various applications in the chemical, petrochemical & pharma processes, such as in product drying, freeze drying, solvent recovery, evaporators, dehydrators, crystallizers and for other general vacuum applications such as conveying, regeneration of molecular sieves, vacuum filtration, etc. The boom in the global market in refined chemicals, medicines and other products led to the increase in the use of the vacuum equipment across the process industry. The major concern in chemical and pharma processes is to offer vacuum systems, which are capable of handling corrosive and toxic vapors and gases.
Earlier there were limited methods in the field of manufacturing, these could help in reducing the waste contents. However, with the changing face of the world and the technological advancements, industries learnt and shifted towards the advanced technology of vacuum pumps. Nowadays, almost 75 per cent of the process industry uses vacuum pumps and allied systems. This has helped the industry reduce waste to a large extent and has increased production and profitability.
The following conventional vacuum pumps are used in the process industry:
- Liquid ring pumps / water ring pumps
- Oil sealed pumps - rotary & reciprocating
- Steam jet ejectors
- Water jet ejectors
For decades, in applications demanding maximum pressure below one mbar, oilsealed rotary vane pumps were the most popular solution. All of the above (wet technology) utilize liquid media that can be oil, water, or steam to generate vacuum inside the given volume or the process. During evacuation, there is a carryover of the process solvent/vapor, which contaminates the pumping media. Treating this contaminated medium is a major concern. Additionally, the process involves huge investment as norms of disposal set by the Pollution Control Board have to be met.
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