Zeolite PV for Ethanol dehydration

Pervaporation is an energy efficient combination of membrane permeation and

evaporation. It's considered an attractive alternative to other separation methods for a variety of processes. For example, with the low temperatures and pressures involved in pervaporation, it often has cost and performance advantages for the separation of constant-boiling azeotropes. Pervaporation is also used for the dehydration of organic solvents and the removal of organics from aqueous streams.

Additionally, pervaporation has emerged as a good choice for separation heat

sensitive products.Pervaporation can used for breaking azeotropes, dehydration of solvents and other volatile organics, organic/organic separations such as ethanol or methanol removal, and wastewater purification.

Pervaporation & Vapor permeation involves the separation of two or more components across a membrane by differing rates of diffusion through a thin layer and an evaporative phase change comparable to a simple flash step. A concentrate and vapor pressure gradient is used to allow one component to preferentially permeate across the membrane. A vacuum applied to the permeate side is coupled with the immediate condensation of the permeated vapors. Pervaporation is typically suited to separating a minor component of a liquid mixture, thus high selectivity through the membrane is essential.

High performance Zeolite or Hybsi® membranes (a proprietary technology of ECN, www.ecn.nl) have been successfully developed and applied for industrial purpose since many years ago. This energy efficiency technology have been widely accepted in China in many industries like pharmaceutical, semi-conductivity, petrol chemical,etc. It have been prooved from many projects that PV&VP technology has many advantages than traditional dehydration processes like evaporation, distillation, and zeolite adoption.

Characteristics of PV/VP process:

* Low energy consumption, less running cost

* No entrainer required, no contamination to product

* Easy operation and less maintenance

* Functions independent of vapor/liquid equilibrium

* Reliable treated solvent quality

* Less labor cost

* Less waste discharge

Solvent Dehydration by PV&VP Technology:

Methanol Acetone Ethyl tert-butyl ether (ETBE)

Ethanol Butanone Di-isopropyl ether (DIPE)

Propanol & IPA

Methyl isobutyl

ketone (MIBK)

Tetrahydro furan (THF)

Butanol & IBA Triethylamine Dioxane

Pentanol Pyridine Methyl acetate

Cyclohexanol Aniline Ethyl acetate

Benzyl alcohol



Butyl acetate

Benzene Dichloro methane Acetic acid

Toluene Perchloroethylene


Methyl tert-butyl ether