Humboldt H-1499 User Manual

H-1495_99_man_09.09

product manual

H-1495 & H-1499

REFLUX

EXTRACTOR

Introduction

This Reflux Extractor is designed using hot solvent extraction, determines percentage
of bitumen in paving mixture. For H-1495 each cone has 500g capacity and for
replacement filter paper use H-1497 series. For H-1499 each cone has 1,000g capacity
and for replacement filter paper use H-1482 or H-1498 series. Components are available
as replacement parts.

Sample Preparation

1. If the mixture is not sufficiently soft to separate with a spatula or trowel, place
approximately 4,000g in a large flat pan and warm in the oven at 240°F (115.6°C)
only until it can be so handled. Separate the mixture using care not to fracture
the mineral particles. Mix and quarter the warm material to obtain a portion for
extraction weighing approximately 1,000g. For routine testing, smaller samples
maybe used when the maximum size aggregate therein is less than ¼" (6.4mm).

2. At the same time weigh a 500g portion into a metal still, Humboldt 1871,
conforming to section 2 (A) of the standard method of test for moisture or volatile
distillates in bituminous mixtures (AASHTO) Designation T-110 & ASTM D1461.

3. Dry, if necessary and weigh two sheets of filter paper. Fold each sheet separately on
its diameter and fold twice again, one fold being made over the other to make three
segments. Open to form a hollow 3-ply cone with a single 1-ply seam and place in
wire cones of extractor frames.

4. Weigh each frame with filter paper in cone to nearest 0.1g. Record these tare
weights identifying each frame by number (see Note below).

5. Place approximately 500g of the prepared sample for the H-1495 and 1,000g for
the H-1499 reflux extractors in each of the filter paper lined cones and weigh the
loaded frames to the nearest 0.1g (see Note below). Compact each of the portions
by tamping lightly with finger or spatula blade.

6. Assemble the load frames and place in jar. Carefully pour about 500ml of solvent
over sample in top frame. At no time should the solvent level contact the tip of the
cone in the lower frame. Four or five glass beads placed in jar will facilitate easy
boiling of solvent.

7. Place loaded jar on electric hot plate with ceramic pad between glass and the
heating element cover with condenser and circulate cold water by just cracking
water valve open and waiting for flow.

Caution: Opening the water valve fully will subject the condenser to excessive
pressure beyond the 4 psi limit at which units are 100% factory tested.

8. Adjust heater so that solvent boils gently and a steady flow of condensed solvent
drips into the top cone. Care must be taken to adjust heat so that each portion
of sample is covered with solvent and at the same time the filter cones do not
overflow.

9. Continue extraction until solvent running from tip of lower cone appears colorless
when viewed against a white background. Then shut off heat but not water through
condenser and allow standing until cool enough to handle.

10. Remove frames from jar, dry first in air and then to constant weight in an oven at
240°F (see Note below). If drying at 240°F causes the filter papers to become so
brittle they cannot be handled and brushed, they may be dried separately from the
aggregate and at a lower temperature.

11. Transfer solvent extract from jar to a 1,000ml graduated cylinder. Wash any
remaining asphalt and fines in jar into the graduate with small increments of fresh
solvent and record the total volume.

12. Thoroughly stir the extract in the 1,000ml graduate and immediately pour
100ml into a 100ml graduated cylinder. Pour this aliquot into a tare 200ml silica
evaporating dish. Wash any remaining asphalt and fines from 100ml cylinder into
dish with small increments of fresh solvent.

13. Evaporate solvent carefully in a well ventilate hood and finally ash at a dull red heat
(500-600°C) cool and add 5 grams of powered ammonium bicarbonate and 5ml of
water per gram of ash. Stir and allow digesting at room temperature for one hour
and then drying to constant weight in an oven at 240°F. Calculate the weight of ash
in the entire volume of extract.

14. Determine the water content of the sample in the metal still (section 4B) in
accordance with standard method of test for moisture or volatile distillates in
bituminous mixtures (AASHTO Designation T-110) and calculate the weight of water
in the extraction sample.

Note: Some agencies weigh filter papers and the sample separately from the frames.
After extraction is completed, the filter papers containing the aggregate are transferred
to a pan and then placed in the oven. This exposes more surfaces for drying and
weighing of the frame is eliminated.

Calculation

Calculate the percent bitumen in the sample as follows:

Where: W1 = Total weight of extraction sample in two cones

W2 = Weight of water in extraction sample
W3 = Total weight of extracted mineral matter in two cones and
W4 = Weight of ash in total extract

Sieve Analysis

If a sieve analysis of the extracted aggregate is desired, it maybe obtained by the
standard method of test for mechanical analysis of extracted aggregate (AASHTO
Designation T-30). The total weight of extracted mineral matter in the two cones plus the
total weight of ash in the extract shall be taken as the total aggregate sample weight.
The ash in the extract and the fine mineral matter retained by the filter papers after
brushing shall be included in the total weight passing the No. 200 sieve.

Warranty

Humboldt Mfg. Co. warrants its products to be free from defects in material or
workmanship. The exclusive remedy for this warranty is Humboldt Mfg. Co., factory
replacement of any part or parts of such product, for the warranty of this product please
refer to Humboldt Mfg. Co. catalog on Terms and Conditions of Sale. The purchaser is
responsible for the transportation charges. Humboldt Mfg. Co. shall not be responsible
under this warranty if the goods have been improperly maintained, installed, operated
or the goods have been altered or modified so as to adversely affect the operation, use
performance or durability or so as to change their intended use. The Humboldt Mfg. Co.
liability under the warranty contained in this clause is limited to the repair or replacement
of defective goods and making good, defective workmanship.

Humboldt Mfg. Co.

875 Tollgate Road
Elgin, Illinois 60123 U.S.A.

U.S.A. Toll Free: 1.800.544.7220

Voice: 1.708.456.6300

Fax: [phone]

Email: [e-mail]