High level of chemical refining technology is used for chemical refining by our company. We offer highly productive chemical refining technology to our clients at the industry leading prices. These advanced technologies help meet bulk requirements of our customers easily within the stipulated time frame.
Vacuum Drying Service
Degumming & Neutralizing :
Crude oil is delivered to the system by the Feed Pump in refinery chemical. This oil refinery chemicals are heated to 65 - 70 C in the Crude Oil Economizer by hot oil from down-stream bleaching/deodorizing operations or, when necessary, by steam in the Feed
Heater mixed with pre calculated quantity of Phosphoric acid in a gum
conditioning mixer the pre calculated quantity of water is added . Oil water
mixture is fed to hydration tank to give sufficient residence time for gums
to agglomerate on hydration. This oil is then pumped to separator where the
oil and hydrated gums are separated and pumped to storage or disposal or gum
drying plant in case of soybean gums.
In the case of water degumming process, crude oil and oil refinery chemicals is heated to required temperature in the plate heat exchanger, mixed with pre calculated water
through mixer and fed to the hydration tank for sufficient residence time
for gums to agglomerate. Then it is pumped to separator where oil and
hydrated gums are separated.
Water degummed oil from separator is pumped to plate heat exchanger where
oil is heated to neutralization temperature i.e. around 80 to 85 Deg C. The
hot oil is fed to mixer with requisite quantity of phosphoric acid where oil
and phosphoric acid is allowed a brief holding time and the precipitation of
trace metals take place.
Degummed oil is fed in to mixer where it is mixed with calculated quantity
of caustic soda solution of suitable strength. Free fatty acid reacts with
caustic soda to form soap . The reacted oil is sent to the Gum/Soap
Separator . The precipitated impurities are removed from the oil as water
based heavy phase referred to as soap stock. The gums/soap are collected in
the Heavy Phase Receiver and sent to intermediate storage by the Heavy Phase
Water Washing :
The residual soap in the degummed & neutralized oil is reduced by water
washing. In this case the oil from the separator is heated to about 95 C in
the Washing Heater and then mixed with 10 - 15% soft water in the Wash
Mixer. After a few minutes retention in the Wash Reactor the wet oil enters
the Wash Water Separator. The washed oil, typically containing under 100 ppm
soap and with a reduced level of phosphorus, is sent directly to bleaching
as described above. The heavy phase soapy water is collected in the
Recovered oil tank and drained to Effluent treatment.
Vacuum Drying :
Washed oil is fed continuously to the Vacuum dryer and sprayed through
specially designed nozzles. The vacuum dryer is kept under a vacuum of 70
torr. The dried oil from the vacuum chamber is continuously pumped out by
pump to intermediate storage tank.
The feed oil (acid conditioned, degummed /
neutralized & washed) enters the Bleacher via a Bleaching heater where
the oil is heated up to Bleaching temperature and discharged into the slurry
mixer. A valve dosing system proportions bleaching earth. The earth is
introduced under the oil spray in the mixing chamber for improved mixing so
that earth does not enter the Bleaching Vacuum System. The earth adsorbs any
residual gums and soap as well as trace metals, color bodies and other polar
impurities. The Bleacher has multiple agitated compartments and operates
under vacuum to ensure complete moisture and air removal. The dried oil and
earth mixture is discharged by the Bleacher Discharge Pump to one of the
Filters where the spent earth is removed. The filtered oil is collected in
the Filtrate Receiver. The Bleached Oil Pump sends the oil to Deodorizing
via one of the alternating Polish Filters.
Filter Management :
The standard bleaching system is based on the use of two filters of which
one is on line while the other is being cleaned and prepared for the next
cycle. When a filter has reached its maximum capacity, as indicated by high
feed pressure, it is taken off line for cleaning and replaced by the other
The cleaning procedure begins by first pressurizing the filter with steam
to expel residual oil into the Recovered Oil Tank and dry the spent filter
cake. The oil recovered from the filter cake is collected in the tank and
can usually be recycled to the Bleacher. After drying, a bottom discharge
valve on the filter is opened and the leaves pneumatically vibrated so that
the spent cake is dislodged and discharged via a hopper. The filter is then
closed and readied for the next batch. Before going on line again it can be
pre-coated with filter aid and/or bleaching earth in order to seal the
filter leaves and minimize clogging. The adsorbents are mixed with bleached
oil in the Precoat/Heel Tank and applied to the leaves by circulation with
the Precoat Pump. When not using filter aid or 'off-line'
pre-coat, the empty clean filter is filled and put on line while the other
filter is still in operation. The filtrate from the clean filter is recycled
back to the Bleacher until the filter is pre-coated with bleaching earth and
the oil is clear. After this the full flow is switched to the new filter.
After De-gumming, Neutralization, water washing,
vacuum drying and bleaching the Dewaxing is done. Initially the oil is
cooled by cooling tower water to around 35 Deg C , from 35 Deg C the oil is
cooled by out coming chilled oil to 20 Deg C . This oil is then cooled to 8
Deg C by using Propylene glycol as cooling media. This oil is then feed to
crystallizer for Crystal growth. A proper residence time is given to have a
good crystal growth, after the waxes gets crystallized the oil is subjected
to filtration. This dewaxed oil passes the cold test which gives clarity to
oil even at lower temperature.
Bleached oil is continuously pumped from the Feed
Tank by the Deareator Feed Pump. The oil is pre-heated in the Deaerating
Economizer by outgoing deodorized oil followed by the Deaerating Heater (if
necessary) before entering the Deaerator. The vessel is under full vacuum,
so that residual air is reduced to an absolute minimum. The Deaerator
Discharge Pump sends the oil through a Heat Economizer where the temperature
is increased by hot deodorized oil. The oil is heated to full processing
temperature in the Vacuum Heater by thermal fluid from the Thermal Oil
Heater. A portion of the free fatty acids in the oil will be flashed off as
the oil temperature increases.
The hot oil enters the Packed Column, which is filled with special
structured packing so that the oil is distributed into a thin film and is
evenly agitated by stripping steam flowing counter currently from the bottom
of the column. As a result, free fatty acids and other remaining volatile
impurities in the oil are evaporated and removed with the steam. The
residence time in the column is only a few minutes. The bulk of the free
fatty acids along with aldehydes, ketones etc. in the oil are quickly
stripped off before any heat induced permanent damage has been done.
The stripped oil from the column flows into the Deodorizer where it flows
through the channels of a series of vertically stacked compartments (trays)
while agitated by stripping steam. The prolonged thermal action breaks down
carotene and other color bodies, resulting in a lighter oil color. Also, the
amount of remaining free fatty acids in the oil is reduced to an absolute
minimum. The stripping steam passes through the packed column and no
separate steam is required in the stripping column. The maximum retention
time in the Deodorizer is 70 minutes.
The deodorized oil is discharged into the Deodorizing Economizer and cooled
by incoming oil. The oil is then discharged by the Product Pump and further
cooled to storage temperature in the Deaerating Economizer and Product
Cooler. The anti-oxidant is mixed with oil in the Deodorizing Economizer.
The finished oil is finally sent to storage via one of the alternating
Distillate Recovery :
Fatty acids and other materials, evaporated from the oil, are condensed by
contact with recycled and cooled distillate in the Vapor Scrubber. The
distillate is circulated by the Distillate Pump via the Distillate Cooler
where it is cooled by cooling water. Accumulated distillate is discharged
from the Scrubber to storage.
Trans and Tocopherol :
The high efficiency (low amount of stripping steam) and short retention
time of the stripping column, combined with the possibility to reduce the
heat bleaching time or temperature, ensure optimum conditions for
controlling the process. The oil can thereby be properly deodorized without
the creation of trans fatty acids while also controlling the amount of
tocopherol removed from the oil.
Protection against Air Contamination :
For optimum quality, especially when processing unsaturated oils, the oil
should be protected from air contamination during the entire deodorizing
process. The packed column type Deareator ensures maximum removal of
dissolved air before high temperature heating. This also helps minimize
polymerization of the oil on the inside of the heat exchange coils of the
The control, operation and supervision of the plant can be handled by one
operator per shift. All main process parameters, if required, e.g. flow
rates, temperatures, liquid levels etc. are automatically maintained from a
control panel or, as an option, with the help of PID/PC based controls.