Dedicated To Solvent Recovery

Solvent Recovery at Pervatech

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Solvent Recycling

Re-use of solvents is an important objective in may industries, e.g. pharmaceutical, chemical, bio-tech and paint. The objectives are to improve the sustainability of their companies as well as to save in operational cost and carbon footprint redcution. In many cases these feed stream are complex in composition, which leads to hybrid separation technology approaches in the solvent recovery, solvent purification and solvent dehydration processes. Pervaporation and vapour permeation play an important role in these hybrid processes.

Solvent recycling

Continuous mode dehydration of solvents using Pervatech’s membrane separation skid (MSS) is currently applied in several industry cases. This skid mounted pervaporation plant is able to dehydrate many solvents continuously and is perfect for pilot-scale testing. The unit is easily transported between sites as all the components for pervaporation are available on the skid. Heating and cooling happens inside the skid, so there are no worries about pressurized vessels. The feed is supplied at ambient conditions and the product is returned at ambient conditions. 

Depending on the size of your process, the unit is also able to recover the solvent for you continuously. Annual production capacity of the MSS is between 1200-6000 ton of solvent. THF, di-chloromethane, acetone, NMP, ethyl lactate, isopropanol, acetonitrile, acetic acid and 1-propanol have been already dehydrated using the MSS. However, the list of recoverable solvents is more extended.

Distillation is commonly used for solvent recovery or dehydration. However, in cases where azeotropes are present, or in case of close boiling points, simple distillation to complete purification is not possible or energy and CAPEX intensive. In such cases, a hybrid process of distillation and pervaporation or vapour permeation is an attractive option. CAPEX and energy reductions in the order of 40% can be achieved, leading to a significant CO2 footprint reduction.

More about the MSS

Solvent Dehydration

Solvent dehydration

This picture is an example of a hybrid solvent recovery system for IPA and consists of a simple distillation column, which dehydrates the IPA to the azeotropic composition. Part of the vapour coming over the top is refluxed back into the column and another part is sent to our vapor permeation skid. The membranes are able to remove the final bit of water enabling the IPA to be re-used by the customer. Such membrane systems are compact, for example, they can easily be incorporated in any existing infrastructure on-site and are simple to operate (once-through process).

Membrane systems for many markets