Melamine

C₃N₃(NH₂)₃ · 126.12 g/mol

C₃N₃(NH₂)₃

Resin precursor for laminates and adhesives

Molecular Weight

126.12 g/mol

State

Solid

Catalyst

Alumina/Silica

Reactor

Fluidized bed (low press

Melamine molecular structure — 2D structure

Olefinverbund Integration

Inputs

Urea

→

Product

Melamine

→

Outputs

Resins, Laminates

Chemistry & Engineering

Reaction	`6 Urea → Melamine + 3 CO₂ + 6 NH₃`
Thermodynamics	Endothermic
Catalyst	Alumina/Silica
Reactor class	Fluidized bed (low pressure)
Note	Requires ammonia recycle.

Applications

Melamine-formaldehyde resins
Laminates (Formica)
Dinnerware
Flame retardants

Extraterrestrial Production Pattern

6(NH₂)₂CO → C₃N₃(NH₂)₃ + 6NH₃ + 3CO₂
High-pressure process (7-10 MPa, 370-450°C)
Low-pressure process (0.1-1 MPa, 350-400°C)
Crystallization from solution

Reaction Diagram

6(NH2)2CO -> C3N3(NH2)3 + 6NH3 + 3CO2

Unit Operations

Process steps following chemical engineering unit operation principles

#	Operation	Description
1	Urea Melting	Melt urea in heated vessel
2	Trimerization	High pressure (7-10 MPa) at 370-400°C or low pressure at 350-400°C
3	Off-gas Recovery	Recover NH₃ and CO₂ for urea synthesis
4	Quenching	Quench melamine vapor/melt in water
5	Crystallization	Crystallize from aqueous solution
6	Drying	Dry crystals to <0.1% moisture

S88 Batch Control Model

ISA-88 BatchML schema — simplified for educational purposes

<?xml version="1.0" encoding="UTF-8"?>
<!-- ISA-88 Batch Control Model for Melamine -->
<!-- Educational schema - simplified for demonstration -->
<BatchML xmlns="http://www.wbf.org/xml/B2MML-V0600">
  
  <ProcessCell ID="MELAMINE_PLANT_CELL">
    <Description>Process cell for Melamine production</Description>
    
    <Unit ID="MELAMINE_PLANT">
      <Description>Main synthesis unit</Description>
      
      <!-- Equipment Modules -->
      <EquipmentModule ID="MELTER">
        <Description>Melter</Description>
      </EquipmentModule>
      <EquipmentModule ID="REACTOR">
        <Description>Reactor</Description>
      </EquipmentModule>
      <EquipmentModule ID="GAS_RECOVERY">
        <Description>Gas Recovery</Description>
      </EquipmentModule>
      <EquipmentModule ID="QUENCH_TANK">
        <Description>Quench Tank</Description>
      </EquipmentModule>
      <EquipmentModule ID="CRYSTALLIZER">
        <Description>Crystallizer</Description>
      </EquipmentModule>
      <EquipmentModule ID="DRYER">
        <Description>Dryer</Description>
      </EquipmentModule>
    </Unit>
  </ProcessCell>
  
  <MasterRecipe ID="MELAMINE_PLANT_RECIPE">
    <Description>Master recipe for Melamine</Description>
    <ProductID>MELAMINE</ProductID>
    
    <UnitProcedure ID="MELAMINE_PLANT_UP">
      <Description>Unit procedure for synthesis</Description>
      
      <Operation ID="OP_01">
        <Description>Operation 1</Description>
        <Phase ID="MELT">
          <Description>Melt phase</Description>
          <PhaseLogic>
            <Step ID="STEP_1"><Action>Initialize</Action></Step>
            <Step ID="STEP_2"><Action>Execute</Action></Step>
            <Step ID="STEP_3"><Action>Complete</Action></Step>
          </PhaseLogic>
        </Phase>
      </Operation>
      
      <Operation ID="OP_02">
        <Description>Operation 2</Description>
        <Phase ID="TRIMERIZE">
          <Description>Trimerize phase</Description>
          <PhaseLogic>
            <Step ID="STEP_1"><Action>Initialize</Action></Step>
            <Step ID="STEP_2"><Action>Execute</Action></Step>
            <Step ID="STEP_3"><Action>Complete</Action></Step>
          </PhaseLogic>
        </Phase>
      </Operation>
      
      <Operation ID="OP_03">
        <Description>Operation 3</Description>
        <Phase ID="RECOVER_GAS">
          <Description>Recover Gas phase</Description>
          <PhaseLogic>
            <Step ID="STEP_1"><Action>Initialize</Action></Step>
            <Step ID="STEP_2"><Action>Execute</Action></Step>
            <Step ID="STEP_3"><Action>Complete</Action></Step>
          </PhaseLogic>
        </Phase>
      </Operation>
      
      <Operation ID="OP_04">
        <Description>Operation 4</Description>
        <Phase ID="QUENCH">
          <Description>Quench phase</Description>
          <PhaseLogic>
            <Step ID="STEP_1"><Action>Initialize</Action></Step>
            <Step ID="STEP_2"><Action>Execute</Action></Step>
            <Step ID="STEP_3"><Action>Complete</Action></Step>
          </PhaseLogic>
        </Phase>
      </Operation>
      
      <Operation ID="OP_05">
        <Description>Operation 5</Description>
        <Phase ID="CRYSTALLIZE">
          <Description>Crystallize phase</Description>
          <PhaseLogic>
            <Step ID="STEP_1"><Action>Initialize</Action></Step>
            <Step ID="STEP_2"><Action>Execute</Action></Step>
            <Step ID="STEP_3"><Action>Complete</Action></Step>
          </PhaseLogic>
        </Phase>
      </Operation>
      
      <Operation ID="OP_06">
        <Description>Operation 6</Description>
        <Phase ID="DRY">
          <Description>Dry phase</Description>
          <PhaseLogic>
            <Step ID="STEP_1"><Action>Initialize</Action></Step>
            <Step ID="STEP_2"><Action>Execute</Action></Step>
            <Step ID="STEP_3"><Action>Complete</Action></Step>
          </PhaseLogic>
        </Phase>
      </Operation>
    </UnitProcedure>
  </MasterRecipe>
  
</BatchML>

Process CellPhysical grouping of all production equipment

UnitMajor equipment performing the synthesis

Equipment ModulesIndividual devices: reactors, columns, absorbers

PhasesLowest control level: REACT, SEPARATE, PURIFY

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