Jepson Bolton's International Catalogue
Fat Determination system Buchi model B-810/428Short extraction times are achieved with this very versatile, easy to use fat extraction system, which complies with British and European official methods
The unit has six heating positions and two different size Soxhlet extractors are available. The 30mm size accepts standard paper thimbles; the large 47mm size also accepts standard paper thimbles but allows the use of the sintered glass crucibles of the hydrolysis unit to be used. Also available is the new hot extractor which fits in place of a soxhlet. The extractor is specially designed to reduce the extraction time by up to 50%, depending on sample. The system is available in a number of different configurations, each one suitable for a wide range of solvent extractions and analyses.
The unit is very simple to operate and all six glass extraction assemblies are sealed simultaneously by the sealing mechanism. The heat source is provided by a built-in steam generator or alternatively the unit can be fitted to an external temperature controlled circulator for use at higher temperatures.
The unit is perfectly safe for open bench operation and the solvent can be internally recycled on the operation of a lever The unit is extremely versatile and can be adapted very simply by the operator to carry out a wide range of applications in food, textiles, pharmaceuticals, chemicals, plastics and rubbers.
Fat Extraction System model B-810
Extractor type Soxhlet Soxhlet Hot extractor 30mm dia 47mm dia Extraction volume ml 60 140 60 Thimble dimensions mm 25 x 100 43 x 123 25 x 100 Beaker volume ml 190 190 190 Solvent reservoircap ml 2400 2400 2400 Cooling water cons ltr/hr 60 60 60 Connected load W 2200 2200 2200 Current consumption A 10 10 10 Dimen lxwxh mm 710x500x750 710x500x750 710x500x750 Weight kg 56 56 56 Electrical req 220/240V 50/60Hz
Sample weight: Hydrolysis method 20 g max Direct extraction 80 9 max Hot extraction 20 g max Extraction time 1 to 2 hrs Solvent recovery time 10 mins Solvent recovery efficiency 60 to 80 % Analysis time (incl. drying): Hydrolysis method 4 to 5 hrs Direct extraction 3 hrs Hot extraction 2 to 3 hrs Reproducibility <1%
Configurations Extraction systems are available in tour different configurations. The choice depends on the solvents used, the extraction system (Soxhlet or Hot extraction) and the heating medium.
Type 1 Unit with six Soxhlet extraction positions and Viton seals
Type 2 Universal unit with six Soxhlet extraction positions and composite PTFE/Viton seals
Type 3 Universal unit with four Soxhlet extraction positions, Hot extraction positions and composite PTFE/Viton seals
Type 4 Hot extraction unit with six Hot extraction positions and composite PTFE/Viton seals
Extraction Units model B-810With built-in steam generator for tap water feed of conductivity 650 to 800 us/cm2 (10mm electrode gap)
Soxhlet Configuration dia mm Each
Extraction Units model B-810With built-in steam generator for tap water feed ot conductivity 200 to 650 us/cm2 (7mm electrode gap)
Soxhlet Configuration dia mm Each N26-120 Type 1 30 £5395.00 N26-122 Type 1 47 £5395.00 N26-124 Type 2 30 £5795.00 N26-126 Type 2 47 £5795.00 N26-128 Type 3 30 £6595.00 N26-130 Type 3 47 £6595.00
Extraction Units model B-810With built-in steam generator for distilled or deionised water feed, complete with 10 ltr storage tank and switch box.
Soxhlet Configuration dia mm Each N26-140 Type 1 30 £5995.00 N26-142 Type 1 47 £5995.00 N26-144 Type 2 30 £6595.00 N26-146 Type 2 47 £6595.00 N26-148 Type 3 30 £6895.00 N26-150 Type 3 47 £6895.00
Extraction Units model B-810High temperature version without steam generator. Requires circulation thermostat and connecting hoses which should be ordered separately.
Soxhlet Configuration dia mm Each N26-160 Type 2 30 £5195.00 N26-162 Type 2 47 £5195.00 N26-164 Type 3 30 £5795.00 N26-166 Type 3 47 £5795.00
Extraction Units model B-810High temperature version with six Hot extractors. Requires circulation thermostat and connecting hoses, solvent recovery tube and vessel which should be ordered separately.
Soxhlet Configuration dia mm Each N26-170 Type 4 30 £5795.00
Accessories and Spares
N26-200 Soxhlet extractor 30mm dia, Buchi ref 18241 £172.00 N26-202, Soxhlet extractor 47mm dia, Buchi ref 18240 £155.00 N26-204 Hot extractor complete with universal seal, Buchi ref 23848 £439.00 N26-206 Extraction beaker Buchi ref 18276 £34.75 N26-208 Condenser Buchi ref 18222 £85.00 N26-210 Viton seal Buchi ref 18260 £12.25 N26-212 Universal seal PTFE Buchi ref 22704 £47.50 N26-214 Viton 'O' ring Buchi ref 23365 £2.70 N26-216 EPDM 'O' ring Buchi ref 23366 £2.70 N26-218 Seal assembly: 1 each N26-212, N26-214 and N26-216 Buchi ref 23367 £49.25 N26-220 Seal assembly: 1 each N26-210 N26-212 N26-214 and N26-216 Buchi ref 23374 £64.25
Hydrolysis Unit model B-428The B-428 acid hydrolysis unit enables analyses to be carried out in compliance with European and British official methods which often require a hydrolysis procedure prior to extraction Simultaneous filtration and hydrolysis of four samples can be carried out safely on an open bench in only 15 to 30 minutes using this system. The filter crucibles holding the hydrolysed samples can be transferred directly to the 47mm dia soxhlet extractors of the fat extraction system. Samples ot up to 259 can be hydrolysed. A lifting/lowering jack and a suction unit facilitate the acid hydrolysis of the samples.
No of heating places 4 Hydrolysis vessels l x dia 260 x 48 mm Sintered glass crucible vol 60 ml Dimensions l x w x h 700 x 35O x 610 mm Weight 34 kg Electrical requirements 240V 5A
N26-230 - Hydrolysis unit Buchi model B-428 £3650.00
Accessories and Spares
N30-560 Hydrolysis tubes Buchi ref 03904. Pack of 4 £56.00 N26-224 Cap for hydrolysis tube Buchi ref 19741 £9.95 N26-226 Sintered glass filter crucible Buchi ref 19730 £42.00 N26-228 Sample aspiration tube Buchi ref 19742 £33.75 N26-232 Filter vessel clamp Buchi ref 03274 £5.80 N26-234 Water jet pump Buchi ref 02913 £44.75
Nitrogen Determination Systems BuchiThe Kjeldahl procedure for quantitative nitrogen determination has been in use since 1883 and continues to occupy a dominant role in the estimation of protein in foods. The method has, in the past, been time-consuming and has also involved the manual transfer of quantities of concentrated acid and alkali.
The Buchi systems have been designed to overcome these problems and allow the Kjeldahl procedure to be carried out faster, with greater safety and with a lower level of operator involvement.
The Kjeldahl procedure is characterised by the use ot bolllng concentrated sulphuric acid to effect the oxidative digestions of the organic sample and the reduction of the organic nitrogen to ammonia. The ammonia is retained in the concentrated acid digest as ammonium hydrogen sulphate and while it is possible to determine it in situ, the normal procedure is to render the digest alkaline by the addition of excess sodium hydroxide, and then to steam distill the ammonia which may be determined by titration.
Digestion may be accelerated by adding potassium sulphate to ralse the boiling point of the digest and by using various metal catalysts. The nitrogen content of the sample is calculated from the ammonia obtained by titration. The protein content is obtained by multiplication of the nitrogen content by a conversion factor dependent on the type of material under investigation.
Nitrogen Determination System Selector
The choice is governed by the daily throughput samples desired and the number of operators available.
No. of samples No. of Digestion Distillation per day operators units units Up to 20 1 B-426 B-316 Up to 30 1 B-426/435 B-323 Up to 40 1 to 2 B-435 B-323 Up to 70 1 to 2 2 x B-435 B-339
The above recommendations are based on average time studies and are valid for an 8 hour working day. The data include all tasks from weighing to calculation and will be achieved from a normally equipped laboratory.
Digestion Units BuchiThese digestion units are available with either six or twelve heating positions and may be operated either independently or via the Buchi model B-436 programmable remote control unit (N30-150)
The units are equipped with high-power infra-red heaters; the intensive heating of the samples ensures rapid and complete digestion.
The digestion process normally requires between 35 and 45 minutes to completion. The apparatus reaches operating temperature in approximately 5 minutes, and the heat output can be steplessly regulated with a built-in power controller between 10 and 100%, up to a maximum temperature of 650C. Therefore the ideal operating temperature for each digestion can be obtained.
In the 12 position model it is possible to operate only 6 out of he 12 digestion positions, if desired, thus conserving energy, when insulficient samples are available to fill the unit.
Digestion is performed in cylindrical vessels which are subsequently used as distillation vessels, eliminating the need to transfer the sample in concentrated sulphuric acid to another vessel for distillation.
The special design of the vessels largely eliminates bumping during the digestion, by causing any water drops to reflux along the tube wall rather than falling into the centre of the tube. Smooth boiling may also be promoted by the addition of glass beads.
A fume exhaust unit is placed directly on the top of the digestion tubes, where a special profiled ring and spring clamps provide a tight connection. The gases and vapours generated during digestion may be aspirated off by the Buchi B-412 gas scrubbing system (N30-700) or a water jet pump. Digestion can, therefore, be carried out safely without a fume cupboard and without atmospheric contamination
Stands with two carrying handles, holding 6 digestion tubes, are supplied with each digestion apparatus, one with model B-426 and two with model B-435. The stand can be used to support the digestion vessels during sample preparation or cooling; the design of the exhaust manifold allows each manifold with its complement of tubes to be transferred to the stand as one unit after digestion is completed.
Model B-426 B-435 Number of heating places 6 12 Tube dimensions I x dia mm 260 x 48 260 x 48 Overall dimensions I x w x h mm 560 x 280 x 490 560 x 280 x 490 Weight kg 14.4 20.9 Heater load kW 1.1 2.2 Electrical requirements 240V 50Hz 240V 50Hz N30-105 Digestion Unit, Buchi model B-426, supplied complete with 6 digestion/ distillation vessels, 1 fume exhaust manifold, 1 digestion vessel holder and rack for 6 digestion tubes, equipped for operation with programmable controller model B-436. Buchiref 26773 £1395.00 N30-125 Digestion Unit, Buchimodel B-435, supplied complete with 12 digestion/ distillation vessels, 2 fume exhaust manifolds, 2 digestion vessel holders and 2 racks for 6 digestion tubes each, equipped for operation with programmable controller model B-436. Buchi ref 26770 £2250.00
Programmable control unit Buchi model B-436The B-436 control unit is used to program the heating profile in the digection block. The programming is carried out by entering time and power steps. A delayed start may also be chosen, if required. The program data is stored in a non-volatile memory and the pre-selected parameters are shown on the liquid crystal display In the event of a power failure no longer than 5 minutes, the process being run is brought to the pre-programmed conclusion when power is restored. The digestion control parameters may be altered by PC linked via the serial interface.
N30-150 - Programmable control unit Buchimodel B-436 £1205.00
Accessories and spares
N30-530 Weighing boats, nitrogen-free. Pack of 100 £32.50 N30-560 Digestion/distillation vessel . Buchi ref 03904. Pack of 4 £56.00 N30-580 Glass beads Buchiref 01531. Pack of 50 £5.80 N30-590 Suction manifold gasket Buchi ref 01603 £2.95 N30-612 Suction module complete Buchi ref 26842 £155.00 N30-614 Suction tube glass part only Buchi ref 26755 £108.00 N30-616 Suction tube connector Buchi ref 26875 £30.00 N30-622 Tubular heating element Buchi ref 26744 £22.00 N30-624 Spare control cable for N30-150 Buchiref 26849 £61.95
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