BOILING POINT ANALYZER COALESCER bv-pass, one for water, an Mid-Range Model Sun Oil Company Design

Model 1340

The Mid-Range Model BOILING POINT ANALYZER operates in the 30% to 70% recovered range. This analyzer is, in effect, a single stoge still to which sample is fed ot a constont rote by means of a metering pump and boiled at o constant heat input. Cooled distillate is removed from the boiler ot o constont rote equal to o percentage of the feed rate by o second metering pump. The amount removed con be any quantity between 3C % and 70% of the input rate. The temperature measured by the thermocouple in the boiler can be correlated with the ASTM boiling point temperature equal to the percentage of distillate re- moved, within the limits of the 30% to 70% recovered rote. Excess condensate is returned to the boiler os reflux. The remoin- ing portion of the feed is removed as bottoms from an overflow line in the boiler. With this analyzer's requirement for cooling water, protection from freezing is required. The instrument should be installed with overhead protection ot least; but where freezing will be encountered, o shed incorporating heating should also be con- sidered.

DESCRIPTION

The still [boiler), voltage regulator, etc. ore all conraIned within one large explosion-proof housing, mounted on o vertical steel frame. This frame con be provided with horizontal feet and casters for portability, if desired, ot an extra charge. Sample flow is controlled by o duplex Hills-McConna Mosterline meter- ing pump mounted on o horizontal channel on the lower portion of the frame. In addition, the sampling system consisting of the combined FILTER-COALESCER with block valves is mounted on the frame. To complete the accessories, a total of four rotometers ore supplied: one for sample in, one for FILTER- d one for distillate. A strainer for the cooling water is also provided

Across the metering pump on the sample inlet is a Moore differential pressure regulator used to maintain a constant differential pressure across the pump

OPERATION

Product feed is pumped by one unit of the duplex metering pump at the rote of 25 cc per minute. The sample flows upward through a heat exchanger into the boiler which fills to the level of an overflow through which the bottoms product from the boiler is discharged. The sample charge is boiled by heat supplied by o cart-

ANALYTICAL INSTRUMENTS FOR CONTINUOUS PROCESSES I

-

ridge heater energized through .a constant voltage regu later which is fitted with a nurber of tops to permit selection of the most suitable power supply to the cartridge heater for the sample being analyzed. Vapors are condensed on the inner~ wqll of the reflux condens.eec.with the wndensqie .fi!!ing..~.~,,~a_nnu!us that gathers the liquid to the distillate pump. Excess reflux overflows the annulus and returns to the boiler. In monitoring the boiling point desired, the distillate pump (other half of the duplex metering pump) must be adjusted to pump distillate somewhere between 30 and 70% of the rate at which the feed pump supplies sample to the boiler; the actual rate is dependent on boiling point (recovered rat4 desired. Two valves are pro- vided that permit diverting the flow of distillate and bottoms to two graduated receivers [not supplied) where their rates may be compared.

The sample must boil rapidly enough to evaporate at least 30 - 70% of the charge otherwise the distillate pump may run dry.

Any excess condensate refluxes back to the boiler. The correct heat input can be determined by gradually reducing the heat input to the point where the distillate level just begins to drop below the annulus and will show bubbles in the distillate rotameter. The heat should then be increased about 20% to provide an adequate margin of safety.

A thermocouple just below the bottom of the annulus may record a temperature higher or lower than thari measured by the D-86 ASTM boiling point method. This difference will remain quite constant as the boiling range of the feed varies. However, for those who want to read the exact boiling point temperclture on the recorder to correspond with the D-86 ASTM, the recorder may be offset. When the analyzer is used on gasoline or similar products with a percentage of light ends, a slightly different version of boiler is used. In addition to CI cooler, an absorber filled with HELI-PAK (Podbielniak) is provided to collect and condense these light ends and add them to the distillate.

r

Flow Diagram I

DESCRIPTION OF COMPONENTS

Housing - The boiler assembly, condenser, (absorber when required) and constant voltage regulator ore housed in an aluminum explosion-proof housing designed for use in Class 1, Group D, Division 1 hazardous areas. This housing and all other components of the analyzer ore mounted on o welded steel vertical frame (normally supplied without horizontal feet or casters; however, these ore available ot extra charge.) Sample Flow Control - Sample flow is provided by o precision metering pump, o Hills-McConno Masterline duplex, one pump unit delivers approximately 2%~ per minute lopprox Yz gallon per hour); and o second pumping unit removes the distillate from the boiler annulus at o constant rote based on boiling point meos- urement desired between 30 and 70%.

Motor - A `/A h.p. single phase, 60 cycle, explosion-proof motor, suitable for use in Class I, Group D, Division 1 hazardous oreos drives both of the pumps from o common gear reducer, The motor is protected from over. load by o thermal cut-out built into the motor,

FILTER - COALESCER - The FILTER - CQALESCER IS enclosed in o stainless steel cylinder with O-ring seal. The sample for the analyzer must poss through the first three layers of Fiberglas for removal of particles. Tests indicate particle removal down to 2 micron. The coalescing is performed by the remaining layers of Fiberglas and finally by the outer wrapping of polyurethane. Sample temperatures should not exceed 160°F ond preferably should be os low os possible in order to remove the water.

Flow Rotameters - To monitor the sample flow rate and detect the presence of air or vapor in the sample line, o rotameter is provided between the sample metering pump and instrument boiler, Another rotameter is located in the line between the distillate pump and sample discharge to indicate flow of distillate. A rotameter with needle valve is included in the FILTER - COALESCER by-pass stream to adjust for correct flow.

Boilers - Both of the boilers used ore fabricated of stainless steel and of heliorc welded construction. The r lower portion of either boiler assembly is o tube in tube heat exchanger arranged so that the hot outgoing sample preheats the incoming sample.

Cartridge Heater - The cartridge heater is rated 250 watts ot 120 volts AC, It is inserted into o well lo- coted on the flange of the heat exchanger onto which the boiler is mounted,

, r . 1

Boiler Assembly for heavier products Constant Voltage Source - This is o Regohm voltage regulator which automatically inserts and removes series resistances, so os to maintain o constant vol- tage output. This type of regulator is relatively in- dependent of line frequency and con maintain the output voltage within % % for 60 cycle operation and for combined effects of line, load and frequency. The voltage output from the Regohm regulator is applied to o variable transformer providing an output voltage fodiustable) to heater of from 30 to 120 volts.

Cooling Water System - The cooling water system is provided with o 100.mesh stainless steel screen in a stainless steel body, o needle valve for flow control and o rotometer for flow indication.

Thermocouple Assembly - The thermocouple assem- bly utilizes o Type J iron constantan thermocouple encased in o stainless steel sheath and held in the proper location within the boiler by o tubing connector at the top of the boiler. Boiler Assembly for lighter products

COR_RELATION OF RESULTS

Operation of this continuous BOILING POINT ANALYZER is not a duplication of the ASTM D-86 distillation test method and cannot therefore be expected to yield temperatures obtained by that method. Justification of the instrument lies in the fact that it does have the ability +o quickly recognize changes in the boiling point temperature. The analyzer results can be correlated directly with the ASTM D-86 results, with a repeatability of f 1°F.

GENERAL SPECIFICATIONS

Normal Operating Temperature Range:

Response Time:

Inlet Sample Pressure Limitations:

Inlet Sample Filter Particle Removal

Sample Flow Rote:

inlet Sample Filter Particle Removal Rating: COALESCER Water Removal Rating: 7 to 14 micron is standard; other elements are available at extra cost.

All free water from the sample is removed at the stream temperature.

Materials of Construction: All metal parts in contact with the sample are stainless steel.

Recommended Installation: Overhead weather protection is desirable. Where ,ireezing tempera- tures are expected, full protection with heating is recommended.

Utilities: Electrical -

water .

Sweepstream Sample In and Out:

Analyzer Output Signal:

Dimensions: Weight: 150 to 500°F.

Approximately 2% minutes (dead time and time constant)

30 to 150 psig (consult factory for variations.)

Sample should be below its initial boiling point temperature; and for maximum COALESCER efficiency, it should be as cool as possible. Maximum sample temperature into the COALESCER should not exceed 160°F. (A sample cooler can be supplied as an accessory at extra cost.]

25cc per minute. Sample normally is discharged to atmospheric drain; however, on special order and at extra cost, a system to return the sample to a pressurized line can be supplied,

115 volts &lo%, 60 cycle, 7 amperes maximum. Connection for `I2 ,' conduit. Separate switches provided for heater and total power. [Other voltages and frequencies cat extra cost.)

100°F. maximum; 5 to 100 psig; 5 gal/hr nominal. I/4" NPT female connection provided at "water in" and "water out."

318" NPT female connections provided. `/2" pipe recommended for customer's sweepstream piping.

Type J iron constantan thermocouple.

28" wide x 67" high x 18" deep (without horizontal feet and casters.)

Approximately 425 Ibs. gross [shipping weight); approximately 340 Ibs. net. Both without horizontal feet and casters.