Steam Distillation Units

Steam Distillation Units

The Kjeldahl Method:

Steam distillation is applied in laboratories for the fractionation of water insoluble liquids or solids according to Dalton's law of partial pressures in a gas mixture. It is also used for the stripping of chemicals from mixtures of solutions after displacement of ionic equilibria by adding acids or bases, as in the well known Kjeldahl's method for total Nitrogen determination.

The Kjeldahl method is still the most used for determining Nitrogen and protein content in foods and feeds (official methods). This is simply due to its precision and reproducibility. Many improvements have been introduced aimed at reducing energy consumption, space requirement and sample weight.

The Velp steam distilling units can be used for determining ammomnia nitrogen, direct Kjeldahl or direct alkaline proteic nitrogen, nitric nitrogen (after reduction), phenols, volatile fatty acids, cyanides, sulphur dioxide, alcohol content, etc. in cereals, foods and feed, water, soil, sludges, sediments and chemicals.

F30200183 Velp Model UDK 127 Basic Distillation Unit

complete with test tube (42 dia. x 300 mm.), 250 ml. collecting flask, tongs for test tube, tubing set and inlet tube

The UDK 127 is designed for diversified and flexible use, including applications such as determining ammoniacal nitrogen, protein nitrogen, nitric nitrogen (after reduction), phenols, volatile fatty acids, cyanides, sulphur dioxide, alcohol content, etc. according to official procedures (AOAC, EPA, DIN, ISO)

Features:

• Patented steam generator which uses deionised water and is maintenance-free
• Innovative titanium condenser (patent pending) that achieves outstanding heat exchange, higher resistance than glass, is easy to clean, drastic reduction of water useage, running and maintenance costs
• Epoxy painted inox steel structure with plastic covered housing giving excellent resistance to chemical agents
• Technopolymer splash head (alkali-resistant) that ensures a longer lifetime than glass splash head
• Integrated digital display and software make for easy use
• Safety system prevents dosing pump starting operation if sliding protection is not closed or test tube in place
• Sodium hydroxide dosing pump (volume set on display)
• Supply water feed is automatically stopped during pauses thus cutting down on its consumption

Specifications:

• Distillation time: 5 minutes to collect 100 ml. of distillate
• Sodium hydroxide addition: automatic, 0 ¨C 100 ml.
• Integrated timer
• Reproducibility (RSD): ¡Ü 1%
• Recovery: ¡Ý 99.5% at nitrogen levels 1 ¨C 200 mg. N 2
• Tap water useage: 0.5 l./min. @ 15oC to 1 l./min. @ 30oC
• Detection limit: ¡Ý 0.1 mg. N 2
• Power: 2100 W
• Dimensions: 320W x 770H x 386D mm.; Weight: 23 kg.

Optional Accessories:

Velp Model UDK 132 Semi-automatic Steam Distilling Unit

The patented steam generator using deionised water can produce 100 ml. of distillate in only 4 minutes without any maintenance. An automatic device reduces the consumption of cooling water.

An innovative system permits the use of test tubes with different heights or Kjeldahl flasks up to 500 ml. capacity. A safety device warns about the lack of the test tube in position, the non-closure of the front protection and the absence of the cooling water,

10 different programme menus are available for the most important parameters required for a distillation and the access to the menus, in 5 different languages, is very simple and intuitive.

The unit can be connected to a printer or PC for recording all the data related to a performed work according to GLP (Good Laboratory Practices).

Features:

• Suitable for AOAC, EPA, DIN and ISO methods
• Epoxy painted stainless steel structure with excellent resistance to the attack ofchemical
• and mechanical agents and to corrosion in general
• Reproducibility: +/- 1%
• Recovery rate: o99.5%
• Limit of detection: o2 mg. nitrogen
• Dimensions: 340W x 440D x 720H mm.
• Weight: 28 Kg.
• Power: 2100 W
• Acoustic signal at the end of the distillation
• Display: 2 lines lighted LCD (5 languages selectable)
• Cooling water consumption: 8 litre / minute
• Steam generator feeding water (distilled or deionised): 50 ml. / minute
• Memorisable programmes: 10
• Programmable operations:
  • sample dilution 0-200 ml.; NaOH addition 0-200 ml.
  • distillation duration 2 to 30 minutes or continuous
  • automatic removal of distillation residues
• Serial interface for printer, PC and keyboard
• Unique Titanium condenser: very efficient thermal exchange between the distillate and cooling water. More efficient than glass condensers and extended life time
• Techpolymer splash head: No more glass means wider chemical resistance and preventative maintenance reduction
• Tap water flow meter: assures the presence of cooling water during the analysis and the operator is informed if cooling water is missing by a displayed message
• Distillation residues aspiration system: it replaces the peristaltic pump on original model improving the efficiency and speed of distillation residues aspiration
• Reagents pump calibration: it allows to check in real time the dosage of reagents

Ordering Information:

Accessories:

Velp Model UDK 142 Automatic Steam Distilling Unit with capability for connection to an auto-titrator

Completely automatic distilling unit for all the operative phases with high features of reliability and safety. The patented steam generator using deionisde water allows to perform fast distillations (100 ml. of distillate in only 3 minutes) or very slow distillations in relation with the analysed product, without any maintenance. An automatic device reduces the consumption of cooling water.

An innovative system permits the use of test tubes with different heights or Kjeldahl flasks up to 500 ml. capacity. A safety device warns about the lack of the test tube in position, the non-closure of the front protection and the absence of the cooling water.

The UDK 142 is easily connectable to various models of auto-titrators and the instrument allows to obtain the final result.

All parameters required for the distillation and titration are programmable.

The access to the 20 different programmes menu, in 5 different languages, is very simple and intuitive.

It is also possible to connect the unit to a keyboard and it can also be connected to a printer or a PC for printing or recording all the data related to a performed work according to GLP (Good Laboratory Practices)

Features:

• Suitable for AOAC, EPA, DIN and ISO methods
• Epoxy painted stainless steel structure with excellent resistance to the attack ofchemical
• and mechanical agents and to corrosion in general
• Reproducibility: +/- 1%
• Recovery rate: o99.5%
• Limit of detection: o2 mg. nitrogen
• Dimensions: 340W x 440D x 720H mm.
• Weight: 43 Kg.
• Power: 2100 W
• Acoustic signal at the end of the distillation
• Warning of empty reagent reservoirs
• Display: 2 lines lighted LCD (5 languages selectable)
• Cooling water consumption: 8 litre / minute
• Steam generator feeding water (distilled or deionised): 60 ml. / minute with 100%
• steam flow
• Memorisable programmes: 20
• Programmable operations:
  • sample dilution 0-200 ml.; NaOH addition 0-100 ml.;
  • boric acid addition 0-200 ml.; time related to start 0-30
  • minutes; distillation duration 2 to 30 minutes or continuous;
  • automatic removal of distillation residues;
  • steam flow 0-100%; advance in titration start 0-100%;
  • automatic removal of titration ON-OFF
• Serial interface for printer, PC, keyboard and titrators
• Analogic interface for titrators
• Unique Titanium condenser: very efficient thermal exchange between the distillate and cooling water. More efficient than glass condensers and extended life time
• Techpolymer splash head: No more glass means wider chemical resistance and preventative maintenance reduction
• Tap water flow meter: assures the presence of cooling water during the analysis and the operator is informed if cooling water is missing by a displayed message
• Distillation residues aspiration system: it replaces the peristaltic pump on original model improving the efficiency and speed of distillation residues aspiration

Reagents pump calibration: it allows to check in real time the dosage of reagents

Ordering Information:

Accessories:

Velp Model UDK 152 Distillation and Titration Unit

The UDK 152 distillation and titration system is designed for an accurate determination of nitrogen. ammonia, direct alkaline ptoteic nitrogen (after reduction), phenols, volatile fatty acids, cyanides, sulphur dioxide, alcohol content, etc. in cereals, food and feed, water, soil, sludge, sediment and chemicals. It manages automatically all the process activities from distillation to titration phase (including reagent adding, residues aspiration, final result calculations) in a few minutes.

Features:

• Fully automatic control of distillation and colorimetric titration phases. AOAC offocially recommends colorimetric itiration for Kjeldahl method analysis (this simplifies validation)
• In accordance with official methods AOAC, EPA, DIN and ISO
• Designed for the most demanding laboratory needs
• Velp patented steam generator: less corrosion thanks to use of deionised water, maintenance-free, time saving, extended life and cost reduction
• Highest performances based on the innovative titanium condenser which allows drastic saving of cooling water thanks to an optimised heat exchange
• User-friendly interface with integrated keyboard and a helpful interactive menu which leads the operator step-by-step. The multitasking software allows setting for a full automatic control of distillation and titration phases
• Precise and accurate results, data storage and PC data communication management
• Automatic management of all the process activities from distillation to titration phase (including reagent adding, residues aspiration and final result calculations) and assures precise and accurate results with a complete report and printing options in a few minutes
• 30 factory-set programmes in addition to 10 customisable programmes reduces analysis time
• All data can be stores (up to 4000 values) while a complete data communication management is available with external units (i.e. PC, balances, LIM, etc.) with consequent time saving for the operator
• Safety is a top priority: the unit is equipped with a wide range of safety devices such as sensor for test tube in place, test tube change, safety door, reagents level, reserve level or overflow, cooling water flow and colour check titrant solution
• Supplied ready to use, complete with integrated titrator, test tube, pincer for test tube, collecting flask, connecting tube with reagents sensor level and inlet tube

Specifications:

• Electrical: 220 ¨C 240 V / 50 ¨C 60 Hz
• Dimensions: 440W x 775H x 470D mm.
• Weight: 45 kg.
• Display: Graphic LCD
• Interface: RS232, USB
• Power: 2200 W
• Measuring range: 0.1 ¨C 200 mg. nitrogen
• Reproducibility (RSD): ¡Ü 1%
• Recovery rate: ¡Ý 99.5%
• Detection limit: ¡Ý 0.1 mg. nitrogen
• Water consumption: 1 litre / minute at 30oC ¨C 0.5 litre / minute at 15oC
• Burette minimum volume: 10¦Ìl. / step
• Storage capacity: 4000 results

Accessories:

UDK152 Reference List: