Munters Zeol is the industry leader using Zeolite Rotor Concentrators for low concentration VOC abatement. Munters Zeol employs a team of engineers to design the most suitable, low cost solution to your VOC abatement problem. We use our own HoneyCombe rotors with hydrophobic zeolites to adsorb and concentrate the VOC stream. The smaller, concentrated stream is then directed to your choice of thermal or catalytic oxidizer, RTO, recovery or alternate abatement system.

Company details

79 Monroe St. - P.O. Box 600 , Amesbury , Massachusetts 01913-0600 USA

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Business Type:
Industry Type:
Air and Climate - Air Pollution Treatment
Market Focus:
Internationally (various countries)

What is a VOC?
VOC stands for Volatile Organic Compound. Volatile chemicals produce vapours at room temperature. Organic is a chemical containing carbon atoms. Volatile Organic Compounds include industrial chemicals, solvents, alcohols, and also petroleum products such as  gasoline. VOC's combine with sunlight to form atmospheric ozone, or smog.

Zeolite is a naturally occurring mineral, in crystal form. Natural zeolite is made of hydrous aluminium silicates of sodium, calcium, potassium or barium ions.

Natural zeolite is hydrophilic (water loving) and readily adsorbs and desorbs water. More recently, synthetic zeolites have been developed for commercial applications. Over 70 types of synthetic zeolites have been created.

Hydrophobic zeolite is an inorganic, stable crystal with properties suited to adsorbing VOC’s. The zeolite's inert properties mean that it does not promote chemical reactions and will not even react with strong acids. It is also non-flammable to extreme temperatures.

The basic molecular structure of a zeolite is a tetrahedron or pyramid, formed by silicon oxides (SiOn). The tetrahedron has one silicon atom in the center and oxygen at each of the corners. The tetrahedral zeolites are linked together by oxygen atoms. Linked zeolites form pores, the size of which are determined by how many zeolite molecules are linked together.

Depending of the number of linkages and which alkali ions are present in the crystal structure, several types of zeolites are formed, all with different pore sizes. The size of the pores also determines which VOC’s can be adsorbed.

Munters Zeol uses a mixture of hydrophobic zeolites with different pore sizes. This mixture allows a wide range of organic solvents to be adsorbed. In fact, most commercially available solvents are adsorbed by these hydrophobic zeolites.

A VOC is attracted and held in the zeolite pore by a weak attractive force. This weak physical attractive force between chemically neutral compounds is known as the van der Waals force. The VOC will remain in the pore until it heated, at which time the VOC will be released from the zeolite into the air.

When VOC laden air flows past zeolite molecules, the zeolite acts as a reverse filter or molecular sieve, capturing the compounds which are able to adsorb and allowing the compounds that are too large to flow past.

Munters Zeol combined the hydrophobic zeolite technology with its HoneyCombe rotor technology. A system was created that can operate continuously with constant adsorption and desorption, has a low pressure drop, and maximized the surface area. One square foot of HoneyCombe media has a surface area of 492,480 ft2 ( 45,753 m2).

HoneyCombe rotors were developed over 40 years ago by Munters. Munters is the world’s leading supplier of process systems using HoneyCombe rotors for dehumidification, heat exchange, and VOC abatement. Munters’ HoneyCombe rotors have numerous benefits. Rotors allow for high air flow, truly continuous operation. With a low pressure drop rotors have stable outlet conditions. The hydrophobic zeolite is permanently bonded with the HoneyCombe rotor therefore no attrition of the zeolite occurs.

Munters HoneyCombe rotors are manufactured at the ISO 9001 certified facility in Amesbury, Massachusetts. The rotors are manufactured from a corrugated mineral fiber substrate permanently bonded with a proprietary mixture of hydrophobic zeolite and inorganic materials. The hydrophobic zeolite rotor is inorganic, completely inert and has rigidity, physical integrity and the ability to withstand thermal stress. The permanently bonded hydrophobic zeolite is an integral part of the HoneyCombe matrix and will not be leached out or removed physically or chemically.

As a low concentration VOC laden air stream enters the hydrophobic Zeolite HoneyCombe rotor the air passes through the HoneyCombe media. The rotor turns several revolutions per hour continuously transporting VOC laden zeolite back into the regeneration sector and regenerated zeolite into the process section. In the process section the VOCs are adsorbed onto the zeolite and the clean air is exhausted to the atmosphere.

In an isolated section, a small, hot stream of clean air is drawn through the rotor. This stream is normally only 5–10% of the process volume. The hot air desorbs the VOCs from the zeolite forming a concentrated VOC laden air stream. The regenerated zeolite is returned to the process.

The concentrated stream is sent to a small oxidizer. The oxidizer converts the VOCs to carbon dioxide and water vapor which are exhausted to the atmosphere.

The energy content of the VOCs contributes to the oxidation process further reducing the fuel requirement.

The concentrated VOC stream can also be sent to alternate technologies, such as a condenser which recovers the VOCs for potential reuse, or a biofilter.

Munters is a global leader and premium partner in energy efficient air treatment solutions. Using innovative technologies, our expert engineers create the perfect climate for customers in a wide range of industries with the largest being the food, pharmaceutical and data center sectors. Munters has been defining the future of air treatment since 1955. Today, manufacturing and sales are carried out in 30 countries by around 2700 employees. Munters reports annual net sales in the region of SEK 5 billion and is owned by Nordic Capital Fund VII.

Your Perfect Climate

Munters' vision is to be a globally leading supplier of energy efficient solutions for air treatment and climate control technologies.

Facts And Figures

  • Global presence with sales and manufacturing in 30 markets
  • About SEK 5 billion in annual net sales
  • Around 2700 employees
  • 15 manufacturing plants, 5 logistics and assembly hubs, and 53 sales and service centers
  • Installed base of more than 300,000 air treatment systems
  • Owned by private equity partner Nordic Capital Fund VII

The humidity that exists in the air around us is at the heart of Munters’ operations. Carl Munters’ knowledge of thermodynamics resulted, by the mid-1950s, in innovations where air humidity could be regulated using methods that were based on the laws of nature.

It was in 1955 that the famous Swedish inventor and entrepreneur Carl Munters (1897-1989) founded Munters together with Marcus Wallenberg and two other persons. His initial idea was to develop an air-conditioning system based on the use of evaporative cooling and dehumidification. The development of the key components of the system were the desiccant wheel and the evaporative pads. To the right a sketch of his first rotor, the core of dehumidification.

Munters Expands

Shortly after Carl Munters retired from active management in the early 1970´s, Munters was acquired by the Incentive Group. During the 1970s, the expansion was continued into new markets through subsidiaries and licensees. The company changed it's strategy at the end of the 1970s as some of the patents began to expire. The range of products and applications was gradually extended and the distribution was expanded to most parts of Europe, North America and Japan, largely through licensing arrangement with third parties. In the 1980´s most of the licenses were acquired. A global moisture control service business (MCS) was started 1985.

Carl Munters died 1989. During his lifetime, he applied for close to 1000 patents. In the picture he is awarded a medal by the Swedish king Carl XVI Gustaf.

Introduction to the Stock Exchange

In the 1990´s Munters expanded and became an international Group with own organization in over 25 countries and manufacturing in over 14 countries. The business was centered around The Humidity Expert theme. Munters AB was listed on the Stockholm stock exchange 1997.

A world leading supplier

Carl Munters innovations proved to be of significant commercial value. By continually developing new energy-saving, environmentally friendly solutions, based on his innovations, Munters has become one of the world's leading suppliers in the humidity control field.