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Chemical Industry

Gardner Denver Nash has supplied the global chemical industry with safe and reliable vacuum systems for more than 45 years. Our vacuum pumps, compressors, air ejectors and engineered systems maximize output and efficiency while minimizing maintenance and pollution into the environment. Our solutions are engineered to work smarter. From hermetically sealed pumps that eliminate leakage to engineered hybrid vacuum systems that optimize efficiency, we deliver smarter solutions custom tailored to your specific requirements.

Liquid Ring Technology for the Chemical Industry

NASH & GARO liquid ring pumps and compressors use a fluid compressant instead of pistons, vanes, or rotating lobes. The liquid ring eliminates metal-to-metal contact and delivers cool running, low maintenance performance. While water is an excellent seal liquid and is often used due to its availability and convenience, we know it is not always compatible with chemical processes applications.

In many chemical applications, trace amounts of water cannot be tolerated in the product, and in some applications, alternative seal liquids can yield process advantages. NASH vacuum pumps and compressors can operate with a variety of liquids including sulfuric acid, benzene, ethylene glycol, gasoline, and many more. Our experienced team of application engineers can recommend a seal liquid that is compatible with your process gases.


Chlorine Compression

In this application, chlorine gas is recovered and compressed. Chlorine gas is lethal, toxic and extremely corrosive therefore special consideration to the compressor material, seal liquid, and system configuration is required. Low pressure chlorine gas applications using high concentration sulfuric acid can be handled by a standard nodular cast iron compressor. With lower operating temperatures and sulfuric acid as a seal liquid, there is little to no risk of rust occurring in the iron, making cast iron a more cost-effective choice than Hastelloy. Conversely, high pressure applications require a compressor casing made from Austenitic Stainless Steel (316L or HC276 for certain applications), with ancillaries in the steel to cater for proper corrosion allowances. Our application specialists and engineers are experienced in the design of chlorine compressors and systems and can configure a solution to meet your process needs. 

Hydrogen Compression

This application involves the recovery of hydrogen gas. The low molecular weight of hydrogen and its explosive nature create challenges when selecting equipment. Our compressors are ideally suited for this application due to their liquid ring technology, which minimizes the chance of explosion.

Reactor Vacuum

A reactor is a vessel that is used in the process of synthesizing a new chemical from two or more components. Vacuum is used mainly to lower the reaction temperature and to conserve energy. Process control, solvent/vapor recovery, and evaporation recovery are also valuable. Reactor vacuums are used in manufacturing bulk pharmaceuticals, removing glycol from polyester, producing ammonia, and forming both organic and inorganic compounds.

We offer a variety of vacuum technologies for reactor vacuum including liquid ring vacuum pumps, dry vacuum pumps, steam ejectors and hybrid vacuum systems that combine these technologies for improved efficiency and performance.

Solvent Recovery

Valuable components of the mixture evacuated from your process can be reclaimed in the vacuum system through solvent recovery vacuum systems. Product recovery in an all-pump system can have an extremely short payback period.

Vacuum Distillation

Vacuum distillation separates mixture components under reduced or high pressure. When vacuum distillation occurs at a lower boiling point, compounds are separated from higher boiling point compounds mixtures. In order to get the desired valuable products separated and recovered, vacuum distillation is necessary. 

Nash is a leading global provider of engineered vacuum solutions for vacuum distillation. Experienced application engineers ensure maximum efficiency and performance benefits while optimizing customized processes, applications and technology requirements.

Vacuum Solutions for Distillation 


Vacuum Filtration

In this application, the moisture from the filtrate receiver of a vacuum filter is collected and fed back into the system. If a system upset occurs, such as the failure of the filtrate pump, slugs of liquid can carry over into the vacuum system. Soft solids from the filter can also enter the vacuum system. In both cases, the liquid and soft solids will not damage the liquid ring vacuum pump, improving the overall reliability of the vacuum filtration system. A variety of seal liquids compatible with the process vapors may be selected in order to minimize contamination of gases extracted during the filtration process.

Vapor Recovery and Gas Boosting

This application differs from vent gas recovery in that the vapors recovered are of a relatively fixed composition rather than a variable mixture. A typical application is capturing gases vented from storage tanks. The vacuum level is closely controlled in order to protect the storage tanks. Usually, the discharge pressure is relatively low. Often these gases are returned to the process or are liquefied and returned to the storage tanks.

Vinyl Chloride Monomer Recovery

In the monomer recovery system, unreacted vinyl chloride is transferred into a holding tank. The vacuum system scavenges gas out of the PVC and delivers it to the compressor at or near atmospheric pressure. A single stage compressor system then compresses the gas for condensation and storage as a pressurized liquid.