Food Industry

R&P Co. Grasys is well experienced in dealing with companies engaged in the food industry. In food production the company’s nitrogen generators and units find wide application in creating modified atmosphere - inert gas ambient – to store, handle and package such foods as oils, juices, cheeses, yoghurts, coffee, nuts, potato chips, snacks, as well to ensure other processes.

The Key Issues to Address

  • Product packaging in modified gaseous atmosphere
  • Storing food under nitrogen blanket
  • Foodstuff packaging in modified gaseous atmosphere
  • Creating controlled atmosphere in vegetable storehouses
  • Nitrogen for beer brewing
  • Barbotage using nitrogen

Enjoying extensive experience based on efficient cooperation with the food industry companies, Grasys is willing to offer advanced fail-free serial nitrogen production units, as well as systems designed to fit Customer’s applications.

Nitrogen produced with Grasys units is used to create inert ambient aiming to extend shelf life. Through its use such foodstuff as nuts, chips, butter, coffee, beer and a lot more are packaged. Nitrogen is also used to create a modified atmosphere in vegetable storehouses and to improve efficiency of fish breeding.

Companies involved in grocery and food production are among our regular Customers. The use of industrial gases can substantially extend the product shelf life and provide eye appeal for customers. Packaging in nitrogen ambient nowadays is of great concern to all forward-looking operations managers.Technological state of the art enables to widen product competitive edges while being completely safe for customers.

General Application

Product Packaging in Modified Gaseous Atmosphere OpenHide

One of the major problems faced by food manufacturers is the product shelf life of short duration. As of today, the most effective way to solve this issue appears to be using modified gaseous atmosphere with nitrogen. Grasys nitrogen units ensure companies with nitrogen vendor independence and provide an opportunity to keep under control the nitrogen insourcing in the required quantity at the lowest possible cost.

In the food industry nitrogen is used to fill and package foodstuff in the modified gaseous atmosphere (MGA). The MGA packaging is used for such food products as nuts, chips, butter, coffee, and others. Grasys is pleased to offer fail-free advanced serial nitrogen generators, as well as systems designed to fit Customer’s applications.

Through replacement of oxygen molecule and water vapor content in the atmosphere air with inert nitrogen oxidative processes are prevented, aerobic bacteria growth on the product surface is limited, the food taste and aromatic properties are preserved, and the shelf life is extended without having to use preserving agents. The MGA is also instrumental in reducing rate of the product breathing process (which means gas exchange with the environment). As a result, the product competitiveness and operation performance are essentially improved.

Nitrogen (N2) is the basic gas used for packaging in the modified gaseous atmosphere (MAP). Its volume content in the MGA may range from 70 to 100%. Carbon dioxide (CO2) can also be used, and in some cases (for packaging fresh meat, fish and herbs) oxygen (O2) is applicable as well. The gas ratio is selected based on many factors, including such as the type and number of microorganisms, acidity, product composition, temperature, and manufacturing process.

Optimum Nitrogen Content in MGA to Package Various Products

Foodstuff N2 content, % Shelf life in the MGA, weeks
Crisp lettuce, onion 90-96 1-2
Powder milk from 99,95 20
Nuts, potato chips from 99,5 20
Sausages, salami from 80 7-10
Hard cheese, cold cuts from 70 3-4
Shortbread cookie up to 100 3-8

Nitrogen-filled airtight packaging is most preferable for roasted nuts, seeds, potato chips and other foodstuff where the MGA nitrogen content ranges from 99.9% subject to the food industry requirements. The use of 99.5% pure nitrogen in grinding and packaging of dry coffee keeps to a minimum oxidation of aromatic oils and extends product shelf life.

Nitrogen packaging of sausage products (various kinds of sausages, as well as frankfurters, thick wieners, bratwurst and others) enables to substantially extend product shelf life and effect deliveries of fresh food to remote regions, expanding that way sales geography. Furthermore, nitrogen packaging prevents sausage products from the drying process. By virtue of such packaging, the return of unsold products with the expired shelf life is kept to a minimum.

Foodstuff Storage under Nitrogen Blanket OpenHide

The use of nitrogen inert gas in the food industry enables to extend severalfold product shelf life while safekeeping tremendously its appearance and taste properties. One of the most natural ways to prevent product oxidation and preserve its nutritional qualities is the storage under nitrogen blanket using Grasys nitrogen generators and units.

Storing food under nitrogen blanket is of particular importance for dairy, fat-and-oil products, drinks, and others. Fats, oils and products containing a large amount of fat and oil lose their usefulness to consumers due to oxidative processes. Oxidation occurs as a result of the fatty acid interaction with oxygen contained in the ambient air.

Oxidative processes can be slowed down. So, when storing fat-and-oil products in inert ambient, the oxidation process can be decelerated severalfold by filling refined or untreated oil storage container with nitrogen using the nitrogen breathing system (NBS).

The primary function of the nitrogen breathing system covers items as follows:

  • prevention of foodstuff, fats, oil oxidative processes;
  • preservation of the food taste and aromatic qualities;
  • shelf life extension (resulting in improving competitiveness of the finished products and operations performance in broad terms).

In automatic mode, pressurized nitrogen from the nitrogen unit comes for reduction so that to meet the desired pressure of the process conditions, whereupon it enters the tank. By doing so, product storage under operating pressure of the nitrogen blanket is ensured in the tank.

For large and small breathings, the further described processes are provided for. When the pressure increases (when filling container with the product), the tank breather valve is activated to release the nitrogen blanket. When the pressure drops in tanks, nitrogen is automatically supplied from the nitrogen unit to maintain the tank operating pressure.

Research and Production Company Grasys has specifically developed nitrogen generator NITROPOWER for companies dealing with food storage technology under nitrogen blanket. Nitrogen generators NITROPOWER can be either of permanent-type or housed in a modular container.

Nitrogen for Beer BrewingOpenHide

Nitrogen is used at a variety of beer brewing stages:

  • To store grain crops, raw materials, ingredients used to brew beer. While being stored, ingredients for making beer are subject to decomposition and fermentation processes by interacting with moist air. The use of inert nitrogen prevents food from decomposition and aerobic bacteria growth. For this reason, constant nitrogen supply to the storage facilities shall be ensured.
  • To prevent oxidation in beer. When exposed to air, beer is quickly oxidized and its quality tends to decrease. To prevent air from entering the tanks, they are filled with the so-called nitrogen blanket (which is a protective nitrogen layer).
  • To clean and fill keg containers. Through the use of nitrogen, it becomes possible to reduce water consumption when washing and cleaning kegs. While filling keg containers, nitrogen substantially increases the process speed and prevents the beer from oxidizing.
  • To purge pipelines and process equipment. Oxygen easily penetrates pipelines and equipment. Purging with nitrogen enables to decrease oxygen content as a result of which the growth of microorganisms and bacteria is reduced.
  • To force out beer. In sophisticated breweries nitrogen is being replaced by carbon dioxide as the fluid used to force beer out of storage tanks for filtration. In addition, the negative effect of carbon dioxide on taste is reduced.
  • To fill tanks with beer. Nitrogen is used when filling storage tanks with beer, which extends its shelf life.
  • To mix. Nitrogen in the liquid fluid forms bubbles that provide good mixing in the tank. It is an advanced alternative to mechanical mixers.
  • To bottle beer. Filling bottles and keg containers with nitrogen enables to reduce oxidation and extend beer shelf life.

R&P Co. Grasys has specifically developed nitrogen generator NITROPOWER for brewing companies. Nitrogen generators NITROPOWER can be either of permanent-type or housed in a modular container.

Barbotage Using NitrogenOpenHide

Barbotage (nitrogen injection process) is used to deal with such basic challenges as oxygen removal, increase in product volume or consistency change. Barbotage is of great importance for the fat-and-oil industry facilities and wine-making companies where R&P Co. Grasys nitrogen generators and unitsefficiently operate.

Barbotage in Winemaking

Nitrogen finds wide application in winemaking aiming to replace oxygen. Thus, upon the fermentation stage, oxygen needs removing from the wine as it degrades the wine quality. There appears simultaneous removal of the dissolved-in-wine oxygen as well as a change in the carbon dioxide composition.

As a result of barbotage, the wine is saturated with nitrogen bubbles. While nitrogen bubbles are moving in wine, oxygen molecules get mixed with nitrogen molecules, and the resulting gas mixture is removed.

The barbotage effect depends on a number of factors including nitrogen bubble size, wine temperature, nitrogen flow rate, contact time, and others. This process is likely to have several stages.

Nitrogen in winemaking is used not only for barbotage process, but it is also essential for such production stages as fermentation, storage, production, wine bottling, and others.

Barbotage in the Fat-and-Oil Industry

The use of inert nitrogen gas in the fat-and-oil industry enables to extend severalfold product shelf life, while safekeeping tremendously its appearance and taste properties. Oxidation prevention is a major concern in production, storage and packaging of oils and fats.

One of the operating procedures to ensure protection against oxidation is barbotage. Nitrogen is used to force out oxygen and water vapor so that to prevent oxidation.

Grasys nitrogen generators and units capable of producing up to 99.999% pure nitrogen from air are specifically designed for the food industry companies to support engineering processes.

R&P Co. Grasys is engaged in designing equipment to fit the Customer’s requirements. We deal both with supplying serial equipment and implementing individual projects. We deploy innovation technologies thanks to which our air and gas separation units maintain leadership position in the market. Supposing you have decided to work together with us, we are pleased to propose:

  • design and manufacture of gas separation units in line with your requirements;
  • turnkey installation involving start-up and commissioning;
  • staff training to ensure successful operation of the supplied equipment;
  • maintenance throughout the entire operational time.

Food grade nitrogen produced by Grasys units is used to create inert ambient that prevents food from oxygen contact implying that it helps extending shelf life. Nitrogen is one of the Earth's atmosphere components. It exists in nature, and by using special technology our equipment is capable of separating nitrogen from the air. Nitrogen packaging, transshipment and storage of food are used for such products as:

  • juices;
  • coffee;
  • potato chips;
  • nuts;
  • oils, fats, and others.

Use of Nitrogen in Food Production

Nowadays food manufacturers place high emphasis on the cutting-edge technologies that ensure a longer shelf life of various foodstuff. For this reason, nitrogen is used as a standalone product or with admixed carbon dioxide. Special environment available when packing products helps prevent oxidation and maintain eye appeal and freshness, which is instrumental for product competitiveness. Most commonly package capabilities in nitrogen environment appeal to manufacturers of juices, snacks, oils, etc.

It is worth mentioning that packaging in nitrogen environment is relevant for other foods and is used as well for:

  • coffee;
  • fats;
  • nuts;
  • confectionery;
  • vegetables;
  • fruits, and others.

Streamlined management system in any production involves taking advantages of all possibilities offered by technological state of the art. Each food manufacturer is tasked not only with high product quality assurance, but also with arranging conditions for its long-term and safe-for-consumers storage. Nitrogen and carbon dioxide are mixed in certain ratios to create packaging environment. Most commonly, they make 70% and 30% (or 80% and 20%). Though, practice has shown that this ratio may slightly vary.

For product manufacturers the efficient equipment is considered to be a unit that fully complies with the engineering process requirements. Nitrogen production units are functional and practical solutions used for quality food packaging.

Should you be interested in improving competitiveness of your products, feel free to employ innovation technologies in the production process. We are engaged in designing, manufacturing and servicing the supplied nitrogen equipment, so while having it in operation you will be spared any trouble.


General Application

Foodstuff Storage, Handling and Packaging

The use of modified atmosphere - inert gas ambient - in food production enables to extend severalfold product shelf life while safekeeping tremendously its appearance and taste properties. Nitrogen is used as an inert gas as it is a weakly reactive and poorly soluble atmosphere component in the product and packaging. Grasys membrane nitrogen units enable effective removal from the air of the most active atmosphere component that contributes to food spoilage, i.e. oxygen. The use of Grasys units allows protecting foodstuff against oxidation, mold attack, microorganism growth, and harmful insects.

When in service, Grasys units that have been specifically designed for food storage applications, finished products packaging in inert ambient, as well as for creating controlled environment in vegetable storehouses, will spare you a lot of troubles such as:

  • Oxidation

    Oxidizing agents, including oxygen, have a particular effect on unsaturated fatty acids. Meanwhile, there appear offensive odors and tastes, more specifically in such foodstuff as butter, margarine, nuts, potato chips. For the majority of perishable products this process can be slowed down by lowering oxygen content of the package to below 2%. Grasys units are capable of producing up to 99.9% pure nitrogen.

  • Mold Attacks

    Mold is one of the basic organisms that make food unusable. Filling packages with high purity nitrogen (98-99.9% pure) ensures effective prevention against mold growth.

  • Reproduction of Microorganisms

    The reproduction of microorganisms, especially bacteria, makes food poisonous. This process can be stopped or slowed down by filling the package with mixture of nitrogen and carbon dioxide.

  • Harmful Insects

    The inert atmosphere ensures protection against insects. Such environment appears to be deadly for the majority of insects. Grasys is the only Russian commercial manufacturer of membrane gas separation units.

Thus, product storage and packaging in modified atmosphere are capable of extending product shelf life while preserving its taste and essentially improving product competitiveness. In Western countries in food production modified atmosphere is widely used to store and package such foods as butter, cheeses, juices, carbonated drinks, yogurts, coffee, nuts, potato chips, and many others.

The units are developed and manufactured by using the most advanced fifth-generation hollow fiber technology, which provides the equipment with a number of unique advantages as follows:

  • Cost Effectiveness

    Nitrogen produced by the units is up to ten times at a more favorable price than that produced by cryogenic or adsorption technology, or purchased in cylinders.

  • Reliability and Simplicity

    These features are the basis of the entire system. It has no moving parts. By passing compressed air through membrane system, nitrogen is separated from other gases and comes directly into controlled atmosphere.

  • Adjustability

    The desired purity (up to 99.99%) and nitrogen capacity (up to 5000 m³/h) can be preset. There is no need to dilute nitrogen with oxygen as the nitrogen purity is very high.

  • Convenience

    Membrane nitrogen units are fully automated, so the operation is unmanned with no maintenance staff required to service the unit, while start-up and stop take just a few minutes.

Creating Controlled Atmosphere in Vegetable Storehouses


Grasys is engaged in manufacturing units to maintain microclimate by concentrating nitrogen in the indoor atmosphere. Shelf life extension for agricultural products with the lowest possible spoilage is achieved due to gas environment control system in the storehouse. Nitrogen enjoys wide application in the food industry for storage and preservation. When produced using our plants, nitrogen is two-to-ten times cheaper than the one produced by cryogenic or adsorption technology or stored in cylinders.

Our low-cost nitrogen plants are based on hollow fiber membranes that feature as follows:

  • The required purity and nitrogen capacity can be preset. There is no need to add oxygen to bottled nitrogen due to its very high purity.
  • Simplicity is the basis of the entire system. It has no moving parts. By passing compressed air through a membrane system, nitrogen is separated from other gases and comes directly into controlled atmosphere.
  • No need for CO2 scrubber. Once switched on, the controlled room air (containing nitrogen, oxygen, CO2) can be recirculated through our unit where CO2 will be isolated and removed. Thus, there disappears any need for a scrubber.
  • No combustion. Lots of atmosphere control systems rely on propane combustion to reduce oxygen content in the controlled room air. This dangerous method results in accumulating residual CO2 hydrocarbons. Our units require no combustion. No additional products come into the controlled room. Gases separated from the nitrogen-oxygen mixture (air) are released into the atmosphere or recover in other processes.

Tests performed with apples stored using atmosphere control system have shown amazing results.

The poor fruit and vegetable preservation in the ordinary ambient air has been demonstrated as a result of two experiments using apples.

The first experiment was performed with fruits, including red best-quality apples. Two apple batches were stored in a room of about 2000 m³, controlled by medium monitoring system. The third batch, the control one, was stored in a room with microclimate supported by combustion products generator and CO2 absorber.

The air in the room equipped with medium monitoring system the oxygen and CO2 content was supported at the level of 1.5 and 2.0%, respectively. Apparently, the system substantially reduced oxygen content in the air. This air composition kept maintained over a period of 6 months.

As a result, 83% of fruit were preserved in the room equipped with such system while in the room equipped with a combustion product generator this number made just 73%.

The second experiment was performed at the gardening experimental station. In this case, apples of various kinds were used with each stored in small 90 m³ rooms.

Three batches of McIntosh apples were stored at 3°C using microclimate unit with oxygen and CO2 concentrations supported at the levels of 1.5% and 1.8% over a period of 173 days. In doing so, 92% of apples were preserved. Empire apples kept quite as much over a period of 216 days.

The other apple batch was stored under the same conditions (1.5% O2 and 1.8% CO2) though at 0°C for 219 days. The result was the same - 92% of fruit retained stability of a freshly picked fruit, and one of the varieties - Red Chief - was preserved completely.

Information contained herein does not constitute а public offer

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