MASS TRANSFER LAB

EQUIPMENT

LIQUID/LIQUID EXTRACTION UNIT

 

 

Liquid/liquid extraction is a valuable process in chemical engineering where the separation of one or more of the components from a liquid mixture is required. The Armfield UOP5 unit demonstrates this process in the laboratory so that students may gain a thorough understanding of this industrial technique. Meaningful experiments may be conducted within a two hour laboratory period and students benefit from visual  observation of the process

SERVICES REQUIRED

Electrical supply:

UOP5-A: 220-240V/1ph/50Hz

UOP5-B: 120V/1ph/60Hz

UOP5-G: 220V/1ph/60Hz

Cold water supply: mains pressure

Vapour extraction system

OVERALL DIMENSIONS

Height: 2.5m

Length: 1.30m

Depth: 0.75m

SPECIFICATION

Volume: 3.3m3

Gross weight: 380kg

 

 

 


GAS LIQUID ABSORPTION COLUMN

 

 

 

 

 

         

The Armfield Gas Absorption Column has been designed to demonstrate the principles of gas

absorption and to provide practical training in the operation of gas absorption plant.

The packed absorption column is made up of two 75mm diameter borosilicate glass sections

joined end to end and installed vertically on a mild steel floor standing framework. The column is filled with 10mm x 10mm Raschig rings, also glass, which are representative of the type of packing used in gas absorption. Liquid for the process is stored in a 50.0 litre rectangular feed tank and a centrifugal pump is used to deliver the liquid to the top of the column where it falls through the packing and returns to the tank. A variable area flow meter in the recirculation line gives a direct reading of flow rate.

TECHNICAL DETAILS

Feed tank capacity: 50.0 litres

Diameter of column: 0.075m

Volume of packing: 7.0 litres

Height of absorptioncolumn: 1.4m

Type of packing: Raschig rings 10x10mm

Air compressor capacity: 0.15m3/min@0.3bar

Column feed pump capacity

Air flow meter range: 20-180 l/min

Gas flow meter range: 1.0-22.0 l/min

Water flow meter range: 1.0-10.0 l/min

 

SERVICES REQUIRED

Electrical supply:

UOP7-A: 220-240V/1ph/50Hz

UOP7-B: 120V/1ph/60Hz

UOP7-G: 220-240V/1ph/60Hz

Initial water fill

ESSENTIAL ANCILLARY EQUIPMENT

CO2 Cylinder with pressure regulator

RECOMMENDED ANCILLARY EQUIPMENT

Vent piping to outside laboratory

Titration glassware for liquid analysis

Separate drain tank for treatment of effluent

OVERALL DIMENSIONS

Height: 2.53m

Width: 0.90m

Depth: 0.65m

SPECIFICATIONS

Volume: 2.0m3

Gross weight: 220kg

 


MASS TRANSFER AND DIFFUSION COEFFICIENTS CERa/CERb

 

 

  

 

Two separate items of laboratory equipment have been designed to allow measurement of molecular diffusivities and, in so doing, to familiarise students with the basic notions of mass transfer theory. The gaseous diffusivity apparatus (CERa) involves diffusion with bulk flow, whilst the liquid diffusivity apparatus (CERb) relates to an equi-molar counter-diffusion process

The diffusion of a vapour ‘A’ from a volatile liquid into another gas ‘B’ can be conveniently studied by confining a small sample of the liquid in a narrow vertical tube, and observing its rate of evaporation into a stream of gas ‘B’ passed across the top of the tube.

 


CERB LIQUID DIFFUSION COEFFICIENTS APPARATUS

 

 

    

Armfield has developed a unique diffusion cell which overcomes the traditional problem of slow diffusion rates in liquids requiring long observation times, but without sacrificing accuracy or introducing convective effects.

Essentially, the cell consists of a honeycomb of accurately dimensioned capillaries, positioned

between two liquids of differing concentration of the solute whose diffusion coefficient is to be

determined.

SERVICES REQUIRED

Electricity supply:

CERa-A: 220-240V/1ph/50Hz

CERa-B: 120V/1ph/60Hz

CERb: Battery operated

 

 

 

OVERALL DIMENSIONS

 

CERa Gaseous Diffusion Coefficient Apparatus

Height: 355mm

Width: 450mm

Depth: 390mm

CERb Diffusion Apparatus

Height: 310mm

Diameter: 190mm

Conductivity Meter

Height: 130mm

Width: 150mm

Depth: 250mm

SPECIFICATION

CERa: Volume: 0.20m3

Gross Weight: 30kg

CERb: Volume: 0.10m3

Gross Weight: 10kg