Quick answer. Check that each rig can turn a rate into a coefficient. Every mass transfer experiment here measures a rate, and a rate only becomes a transferable coefficient if three things are known: the driving force, which means analysing both phases or reading wet and dry bulb temperatures on a dryer; the interfacial area, such as a column's wetted area; and a settled steady state before readings begin. Ask what each rig measures on both phases, not just one. Then order by name, because this listing also holds records copied in from unrelated ranges and shares its MTLE prefix with another category.
The mass transfer equipment in this listing covers six subjects, and these are the records to ask for by name: diffusion - vapour in air, liquid in liquid and solid in air diffusion apparatus; gas-liquid contacting - a wetted wall column and absorption in a wetted wall column; adsorption in a packed bed; drying - a fluidised bed dryer, a rotary dryer and natural and forced draft tray dryers; extraction - solid-liquid extraction of the packed bed type and liquid-liquid extraction in a packed bed; and distillation, including a steam distillation set-up.
And the part we would rather tell you than let you discover. This listing also contains records that are not mass transfer equipment at all - they were copied in from other ranges when the catalogue was imported, and most of them can be recognised by a digit on the end of the name. Among them are a shoe flex tester, which belongs with footwear testing equipment; a Martindale abrasion tester, which belongs with fabric testing equipment; a windmill machine, which belongs with renewable energy trainers; and several friction and toggle joint rigs, which belong with theory of machines. There is also a record named after this category itself. We are cleaning this up. In the meantime, ask for the mass transfer items by name, ignore anything with a trailing digit unless we confirm what it is, and have the product name and specification confirmed on the proforma invoice.
One further code warning: this listing uses the prefix MTLE, and so does momentum transfer lab equipment - both category names end in "Transfer Lab Equipment". MTLE-0001 is a fluidised bed dryer here and a drag coefficient apparatus there.
Every experiment in mass transfer measures a rate, and a rate is only a coefficient if three things are known. This is the test to apply to any rig on this page before buying it, and it is what separates a demonstration from a result.
| What must be known | In practice that means | If it is missing |
|---|---|---|
| The driving force | The concentration or humidity difference between the two phases - which means analysing both streams, or measuring wet and dry bulb temperatures on a dryer | No driving force, no coefficient. On a dryer, without the inlet air humidity you cannot compute the driving force at all, only the time the sample took to dry in that room on that day |
| The interfacial area | The wetted area of a column, the surface of a sample, the external area of the particles in a bed | The result is a rate for that apparatus rather than a transferable coefficient |
| Time, and steady state | A stable temperature and a settled flow before readings begin; and for diffusion, patience, because the measurable change is slow | A reading taken while the rig is still settling is a measurement of the settling |
So when you ask us for a quotation, ask what each rig measures on both phases, not just one.
Four dryers are listed - fluidised bed, rotary, natural draft tray and forced draft tray - and drying is the mass transfer subject a student is most likely to meet at work, in food, pharmaceutical and chemical plants alike. The experiment is the drying curve: moisture content against time, showing the constant-rate period, the critical moisture content and the falling-rate period where the material itself starts to control.
Getting that curve requires one thing that is easy to leave off a specification. The sample has to be weighed repeatedly without stopping the air flow - a dryer where the tray must be removed and carried to a balance gives a drying curve with holes in it, and every interruption changes the conditions. Ask whether the sample can be weighed in situ, by a balance under the tray or a suspended arrangement, and what its resolution is.
Then ask for the air side: air flow rate and how it is measured, inlet air temperature and humidity, by wet and dry bulb thermometers or a hygrometer, and whether the air can be heated to a set temperature and held there. A dryer with controlled air temperature, measured air flow and measured humidity produces a drying curve a student can interpret; one with a fan and a heater produces a curve that cannot be compared with anything, including the same experiment next week in different weather.
The wetted wall column gives a gas-liquid mass transfer coefficient, and it depends entirely on the liquid film being smooth and unbroken over the full wetted length. A column with poor liquid distribution channels, the film breaks, the real area is unknown and the coefficient is wrong - so ask how the liquid is distributed at the top, what the wetted length and diameter are, and how the gas is analysed at inlet and outlet. For absorption work, ask what system the rig is designed for and what reagents the analysis needs.
The diffusion apparatus - vapour in air, liquid in liquid, solid in air - measures a diffusivity, which is a slow measurement of a small change: a falling liquid level in a capillary over hours, or a conductivity rising as salt diffuses. Two things matter: a stable temperature, because diffusivity is temperature-dependent and the experiment runs long enough for a room to warm up; and a readable measurement, so ask how the level or the concentration is read and at what resolution. These are good project experiments and poor two-hour practicals.
The extraction units, solid-liquid and liquid-liquid, teach stage efficiency and the use of an operating line, and they bring solvents into the laboratory. Ask which solvent the exercise assumes, whether it can be imported and stored where you are, how it is recovered, and where the spent extract goes. Many extraction solvents are flammable, so extraction equipment belongs in an extracted position away from heaters and ignition sources, and the laboratory needs the provisions set out in our chemical reaction engineering listing - fume extraction, eyewash, a spill kit and a waste route agreed in writing before delivery.
Adsorption in a packed bed produces a breakthrough curve, which is the design basis for every industrial adsorber. Ask what adsorbent is supplied, how the effluent concentration is measured continuously or sampled, and whether the bed can be regenerated so the experiment can be repeated without buying new adsorbent each time - the regeneration is itself worth a session.
Settle before delivery: electrical supply with earth-leakage protection on every outlet, since water, solvents and heaters share these benches; cooling water supply and drain, with the quantity per run for the distillation units; compressed air where a fluidised bed needs it, clean and dry; fume extraction over anything handling a solvent; and bench space that allows a column to be reached at top and bottom.
And if the steam distillation unit is on your list, settle the steam supply first. A steam generator is normally a registered pressure vessel subject to periodic inspection by a competent authority in the destination country, and that is a matter of arranging registration before commissioning rather than after. Ask us for the vessel certificate, drawings and relief settings with the quotation, and put them to your own authority before the equipment ships.
For each rig: the experiment and what is measured on each phase, with accuracies; for dryers, in-situ weighing and its resolution, air flow measurement, inlet temperature control and humidity measurement; for columns, wetted length and diameter, liquid distribution, and the analysis method at inlet and outlet; for diffusion, how the measurement is read and whether temperature is controlled; for extraction and adsorption, the solvent or adsorbent assumed, quantities per run, recovery, regeneration and the waste route; services required, including steam and its certification; time to a result, since several of these are project-length experiments; consumables and spares with prices; the worksheets supplied; mass, footprint and access; nominal voltage, frequency and plug pattern; and the warranty, commissioning and local service position. For any certification stated here, contact us for the latest copies of the relevant certificates before you tender on it.
Related ranges: momentum transfer lab equipment and the heat transfer lab range for the other two transport subjects, chemical reaction engineering for reactors, columns and unit operations, and process control and instrumentation for control. The full set is listed under mechanical lab equipments. For a quotation, send us your syllabus experiment list - on this page that is especially useful, because it lets us quote the mass transfer equipment and leave out the records that should not be in this category at all.
Six subjects: diffusion (vapour in air, liquid in liquid and solid in air), gas-liquid contacting (a wetted wall column and absorption in a wetted wall column), adsorption in a packed bed, drying (fluidised bed, rotary, and natural and forced draft tray dryers), extraction (solid-liquid and liquid-liquid, packed bed type) and distillation, including a steam distillation set-up. Records such as a shoe flex tester, a Martindale abrasion tester, a windmill machine and several friction and toggle joint rigs were copied in from other ranges and are mostly marked by a trailing digit. Ask for items by name and have each confirmed on the proforma invoice.
The drying curve plots moisture content against time and shows the constant-rate period, the critical moisture content and the falling-rate period. To get it, the sample must be weighed repeatedly without stopping the air flow, so ask whether it can be weighed in situ, by a balance under the tray or a suspended arrangement, and at what resolution; carrying a tray to a balance leaves holes in the curve. On the air side, ask how air flow is measured, how inlet temperature and humidity are read, by wet and dry bulb thermometers or a hygrometer, and whether air temperature can be set and held.
The column gives a gas-liquid mass transfer coefficient, and that depends entirely on the liquid film staying smooth and unbroken over the full wetted length. With poor liquid distribution the liquid channels, the film breaks, the real area becomes unknown and the coefficient is wrong. So ask how the liquid is distributed at the top, what the wetted length and diameter are, and how the gas is analysed at inlet and outlet. For the absorption version, ask which gas-liquid system the rig is designed for and what reagents the analysis needs, and leave bench space to reach the column at top and bottom.
Usually not. The vapour in air, liquid in liquid and solid in air apparatus measure a diffusivity, which is a slow measurement of a small change: a liquid level falling in a capillary over hours, or a conductivity rising as salt diffuses. Two things matter. Temperature must be stable, because diffusivity depends on it and the experiment runs long enough for a room to warm up. And the measurement must be readable, so ask how the level or concentration is read and at what resolution, and whether temperature is controlled. Treat these as good project experiments rather than short practicals.
The solid-liquid and liquid-liquid extraction units teach stage efficiency and the operating line, and they bring solvents into the laboratory. Ask which solvent the exercise assumes, whether it can be imported and stored where you are, how it is recovered and where the spent extract goes. Many extraction solvents are flammable, so site the units away from heaters and ignition sources, with fume extraction, an eyewash, a spill kit and a waste route agreed in writing before delivery. For the packed bed adsorption unit, ask what adsorbent is supplied, how effluent concentration is measured, and whether the bed can be regenerated.
The steam supply, first. A steam generator is normally a registered pressure vessel subject to periodic inspection by a competent authority in the destination country, and registration should be arranged before commissioning rather than after. Ask for the vessel drawings and relief settings with the quotation, contact us for the latest copies of the relevant certificates, and put them to your own authority before the equipment ships. Also settle the other services: earth-leakage protection on every outlet, cooling water supply and drain with the quantity per run for the distillation units, and clean, dry compressed air if a fluidised bed needs it.
Ray Export is a manufacturer and exporter of laboratory, scientific and educational equipment based at Plot No. 449, HSIIDC Industrial Area, Saha, Ambala, Haryana 133104, India. Enquiries: [email protected], +91-9817319615.
Written by Palak Mall, Senior Content Writer. Technically reviewed by Arvind Kumar, Lab Equipment Specialist, 12+ years in laboratory and testing instrumentation. Last updated: 17 October 2026.
Specifications for the mass transfer rigs, including what is measured on each phase, in-situ weighing resolution, wetted length and diameter, the solvent or adsorbent assumed and the services required, are confirmed in writing on the quotation. For the steam generator and other documents, contact us for the latest copies of the relevant certificates. No price is quoted on this page. Listing note: this listing contains records copied in from other ranges, including a shoe flex tester, a Martindale abrasion tester, a windmill machine and several friction and toggle joint rigs, most marked by a trailing digit, plus a record named after the category itself; and the MTLE prefix is shared with momentum transfer lab equipment, where MTLE-0001 is a different product.
An all metallic area cut little size exhibition modelmade of cast aluminum parts. Rotator presses wateroutward by radial activity. Finish on a cast press basewith a pulley.
The skillet evaporimeter comprises of a cylinderical store offixed distance across and profundity, loaded with water to a fewcentimeters underneath the edge. Afixed point check in a stilling wallserves to show the level of water in the container. A calibratedmeasuring chamber is utilized to include or evacuate water at eachobservation to convey the water level to the settled point. Thereservoir is secured with wire work mesh to ensure the panfrom winged animals and creatures. A thermometer suspended from sum cinched to the side of the store records thetemperature of the water in the skillet. Dish is made of G.!.Sheet.
We are driving producer and exporter of an extensive variety of Fluidized Bed Dryer. The Salt is fluidized, every molecule meets the hot air, releases dampness, gets dry and in the meantime goes forward with no mechanical push. We have demonstrated innovation for outlining dryers of any limit. In this express, the solids carry on like a free streaming bubbling fluid. Customers can benefit this items according to there necessities.
Extent of Experimentations:
To consider fluidization qualities
To consider connection between speed of liquid and weight drop per unit length
Utilities Required:
Power : 500 watts, 220 V, 1 Phase
Floor Area : 0.75 m x 0.75 m
Specialized Details:
Segment : Material Borosilicate Glass
Pressing : Glass Beads
Water tank : Material Stainless Steel, Capacity 30 Ltrs
Water Circulation : FHP Pump, Crompton/Sharp make
Stream Measurement : Rotameter for water
Pr. Drop Measurement : Manometer
The entire set-up is very much composed and masterminded in a decent quality painted structure
With strong responsibility regarding quality, we are occupied with offering incredible quality, Solid Liquid Extraction (Packed Bed Type) . These are outlined under the strict order of our quality analyzers remembering the business rules. After creation, these items are stringently tried on shifted grounds, to guarantee their consistence with worldwide quality benchmarks.
Highlights:
Strength
High elasticity
Protection from consumption
Inferable from the huge experience and learning of this field, we have possessed the capacity to offer premium quality Rotary Dryer to our regarded clients. Produced in consistence with the business laid guidelines, this contraption is generally utilized for different drying purposes. The offered dryers are known for their issue free tasks and simple support.
Details:
Electric supply Provide: 230 +/ - 10 VAC, 50 Hz, single stage electric supply with legitimate earthing. 5A, three stick attachment with switch for measuring scale, 15A, three stick attachment with switch for warmer
Material Saw tidy @ 1Kg. Granular and free streaming strong of size I - 2 mm
We are instrumental in offering better quality Mass Transfer Lab Equipment than the regarded clients, according to their particular requests. These mass exchange labs are outlined in such a way, to the point that our customers' correct prerequisites get satisfied by us. What's more, we have picked up skill in offering modified items to the customers.
Application Area Of Product:
Strong Liquid Extraction (Packed Bed Type)
Assimilation in Wetted Wall Column
Stuffed Distillation Column
Air pocket Cap Distillation Column
Straightforward STEAM Distillation Set-up
Swenson Walker Crystallizer
Assimilation in Packed Bed
Fluid Liquid Extraction in Packed Bed
Strainer Plate Distillation Column
Splash Extraction Column
Assimilation in Sieve Plate Column
Fluidized Bed Dryer
Vapor in Air Diffusion Apparatus
Constrained Draft Tray Dryer
Settled Bed Absorption with Regeneration
Strong in Air Diffusion Apparatus
Regular Draft Tray Dryer
York Scheibel Extraction Column
Fluid in Liquid Diffusion Apparatus
Revolving Dryer
Clump Crystallizer
Mass Transfer with/without Chemical Reaction
(Strong Liquid System)
Strong Liquid Extraction (Bonnoto compose)
Vapor-Liquid Equilibrium Set-Up
Wetted Wall Column, Humidification and De-Humidification Study
Trial Water Cooling Tower
Particle Exchange
We are putting forth better quality Adsorption in Packed Bed than the regarded clients, according to their particular requests. These are outlined under the strict order of our quality analyzers remembering the business rules. We make a point to opportune convey the requested items at the clients' end, through our wide appropriation arrange.
Utilities Required:
Water Supply and Drain
Power Supply: I Phase, 220VAC, 1.5kW
Instruments, Laboratory Glassware and Chemicals required for examination according to the framework received
Details:
Item
Adsorption Setup
Reactor Column
Material Borosil Glass, diverse distance across with various tallness of pressing (3 Nos.)
Encourage Tank
Material Stainless Steel, Capacity 20 Ltrs., encourage lines, deplete valve and so on. (1Nos.)
Accepting Tank
Material Stainless Steel, Capacity 20 Ltrs (1Nos.)
Encourage Circulation
By pump, Magnetic drive made of Polypropylene (1Nos.)
Stream Measurement
Rota-meter 1 Nos. (for bolster)
Bolster Piping
PVC/SS measure
Stop Watch
Electronic
Control Panel
On off switch, Mains Indicator and so forth.
The setup is painted with great quality paints and mounted on a solid help.
The set-up is intended to exhibit and invigorate the dampness expulsion by warm under normal draft activity made by hot air stream.
The set-up comprises of a protected twofold divider chamber. Inside the chamber a plate is appended specifically to an electronic measuring balance, which is fitted on top outside the chamber. Material for drying is set in the plate and normal loss of weight is checked. Air fills in as the drying operator by common activity expels the dampness from the plate by going towards the best openings. An advanced temperature controller is utilized to control and measure the temperature of air stream l
Investigations
Assurance of rate of drying of wet sawdust under various states of temperature
Highlights
Radiant Painted structure
Easy to work and keep up
Reduced and remain solitary set up
Utilities Required
Electric supply Provide 230 +/ - 10 VAC, 50 Hz, single stage electric supply with legitimate earthing. 5A, three stick attachment with switch for measuring scale, 15A, three stick attachment with switch for radiator
Material Saw clean @ 1Kg.
Bolster table Size: 500Wx500Dx750H in mm
The set-up is intended to exhibit and invigorate the dampness evacuation by warm under constrained draft activity made by hot air stream.
The set-up comprises of a protected twofold divider chamber. Inside the chamber a plate is joined straightforwardly to an electronic measuring balance, which is fitted on top outside the chamber. Material for drying is set in the plate and normal loss of weight is checked. Air from blower goes through warming chamber to deliver hot air functions as the drying specialist entered from one side of the chamber and leave the chamber from opposite side expels the dampness from the plate. A course of action is made to shift and measure the wind current rate. An advanced temperature controller is utilized to control and measure the temperature of air stream.
>Experiments
Assurance of rate of drying of wet sawdust under various states of temperature and wind stream
Highlights
Eminent Painted structure
Easy to work and keep up
Minimal and remain solitary set up
Utilities Required
Electric supply Provide 230 +/ - 10 VAC, 50 Hz, single stage electric supply with legitimate earthing. 5A, three stick attachment with switch for measuring scale, 15A, three stick attachment with switch for radiator
Material Saw tidy @ 1Kg.
Anemometer Air stream estimation
The setup is intended to show standards of fluid extraction and mass move task in a pressed section.
The set up comprises of a glass section, pressing, nourish tanks, air controller with weight check, accepting tanks and channeling. Rotameter are accommodated stream estimation
Tests
Assurance of general stature of an exchange unit and general volumetric mass exchange coefficient
Highlights
Stainless Steel tanks and wetted parts
Extraordinary course of action for changing stature of interface zone
Persistent activity
Magnificent Painted structure
Easy to work and keep up
Smaller and remain solitary set up
Utilities Required
Electric supply Provide 230 +/ - 10 VAC, 50 Hz, single stage electric supply with legitimate earthing. 5A, three stick attachment with switch for Compressor
Chemicals for trial according to your decision
Packed Air supply: Clean, oil and dampness free air, weight 2 Bar.
Water Supply and Drain as required
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