17A Marlen Drive w Hamilton, NJ 08691 w USA Tel: [phone] w Fax: [phone] www'ippe'com

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17A Marlen Drive w Hamilton, NJ 08691 w USA Tel
[phone] w Fax [phone] www.ippe.com
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presentation to be redirected to our website
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Overview
Brief Overview

• Year Built A Train 1973 B Train1980
• Year Shutdown September 2006
• Upgraded 2002 major upgrade of equipment in
  both lines
• Current Status Under Nitrogen
• Technology Mitsui, Co., Ltd.
• Production A Train 30 tpd B Train 60 tpd
• Products Produced Melamine
• Operation Days 300 days per year
• Raw Materials Prilled Urea, Molten Urea, Liquid
  Ammonia, Carbon Dioxide Gas, Hot Salt and
  Dowtherm-A
• Utilities Consumed Steam, Fuel and Electricity
• Documentation Available
• Please Click Here for a Detailed Equipment List

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Process Description
Process Flow

• Urea feed is introduced to the melamine synthesis
  reactor (A-1) while urea is stored and maintained
  for reaction in the urea solution tank (B-16)
• In the reactor (A-1), the catalyst is charged and
  the heated carrier gas goes through and forms
  catalyst fluidization. Owing to endothermic
  melamine forming reaction, it is necessary to
  keep the temperature between 350C to 400C in
  the reactor by a heating coil installed in the
  fluidizing bed of the catalyst to which the
  molten salt is introduced
• As the reactants pass through the reactor, the
  molten urea is vaporized and reacted to melamine,
  carbon dioxide and ammonia
• The melamine-rich effluent gas from the reactor
  is cooled down to about 320C in the hot gas
  cooler (W-12A/B) and introduced to the hot gas
  filter (F-4A/B) where the by-products and
  catalyst dust carried out from the reactor (A-1)
  are separated
• The product gas is cooled down again to about
  210C in the crystallizer (A-2) by contacting the
  gas effluent (140C) and a very fine melamine
  particle is formed
• The cyclone separator (F-6A/B) is used for the
  separation of the melamine product and
  consecutive cooling and packing system is
  installed for final treatment

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Process Description
Process Flow

• The remaining gas from the cyclone separator
  (F-6A/B) is introduced to the urea washer (K-1)
  and cooled down to 140C by contact with the
  spray of molten urea
• The gas containing ammonia and carbon dioxide
  serves as a carrier gas in the melamine reaction
  and cooling medium in the crystallizer (A-2)
• The temperature of the molten urea should be
  strictly controlled by the urea cooler system
  (W-14) for washing and cooling the gas
• The molten urea is then mixed with the fresh urea
  feed in the urea storage tank (B-15)
• The yield of melamine by the aformentioned whole
  treatment is over 90 (on the basis of dry and
  theoretical)

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Process Description
Off Gas Recovery

• The off gas from the melamine plant, mixture of
  NH3, CO2, H20 and a small amount of inert gas is
  pressured by the off gas blower (V-8) and sent to
  the off gas absorber (B-18)
• In the absorber (B-18), most of the NH3 and CO2
  in the off gas is absorbed in water fed from the
  battery limit for the off gas absorber
• The produced ammonium carbonate solution is then
  transferred to the battery limit by the off gas
  solution pump
• In consequence of feeding, the ammonium carbonate
  solution to the existing urea plant shall be made
  to keep the designed production capacity of the
  urea plant

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Process Description
Process Flow Diagram
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Process Description
Melamine Specifications

• Shape White Powder
• Quality ? Purity 99.9 min. ? Moisture 0.1
  max. ? Color as APHA 20 max. ? Iron 1 ppm
  max. ? Ash 20 ppm max. ? pH 7.5 9.5 ?
  Ammeline Ammelide 0.01 max.
• Reposed angle 45 54

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Photos
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Contact Information
Visit us at www.ippe.com