Polycarbonate

Molecular Structure

Molecular Details

Molecular Formula	[OC(O)OC₆H₄C(CH₃)₂C₆H₄]ₙ
Molecular Weight	Variable (polymer)
State	Solid at standard conditions

Olefinverbund Integration

Chemistry & Engineering

Reaction Equation	Interfacial polycondensation or Melt transesterification
Thermodynamics	Exothermic
Catalyst System	Amine (Interfacial)
Reactor Class	Stirred tank sequence
Process Considerations	High impact strength. Phosgene-free melt route preferred for safety.

Extraterrestrial Production Pattern

1. Interfacial process: BPA + phosgene in CH₂Cl₂/NaOH
2. Alternative: Melt transesterification with diphenyl carbonate
3. Washing and precipitation
4. Extrusion and pelletization

Applications

• Optical media (CDs, DVDs)
• Safety glasses and lenses
• Automotive headlamp covers
• Electronic device housings

Reaction Diagram

Overall Reaction: BPA + COCl2 -> Polycarbonate + HCl (or melt transesterification)

Unit Operations

Process steps following chemical engineering unit operation principles:

Step	Operation	Description
1	BPA/Solvent Mixing	Dissolve BPA in dichloromethane/NaOH
2	Interfacial Polymerization	React with phosgene at interface
3	Washing	Wash to remove salts and catalyst
4	Precipitation	Precipitate polymer with non-solvent
5	Drying	Dry flakes to <0.02% moisture
6	Pelletizing	Extrude and pelletize

S88 Batch Control Model

This module follows the ISA-88 (S88) batch control standard. Below is a simplified BatchML schema for educational purposes:

<?xml version="1.0" encoding="UTF-8"?>
<!-- ISA-88 Batch Control Model for Polycarbonate -->
<!-- Educational schema - simplified for demonstration -->
<BatchML xmlns="http://www.wbf.org/xml/B2MML-V0600">
  
  <ProcessCell ID="PC_PLANT_CELL">
    <Description>Process cell for Polycarbonate production</Description>
    
    <Unit ID="PC_PLANT">
      <Description>Main synthesis unit</Description>
      
      <!-- Equipment Modules -->
      <EquipmentModule ID="DISSOLVER">
        <Description>Dissolver</Description>
      </EquipmentModule>
      <EquipmentModule ID="REACTOR">
        <Description>Reactor</Description>
      </EquipmentModule>
      <EquipmentModule ID="WASH_TANK">
        <Description>Wash Tank</Description>
      </EquipmentModule>
      <EquipmentModule ID="PRECIPITATOR">
        <Description>Precipitator</Description>
      </EquipmentModule>
      <EquipmentModule ID="DRYER">
        <Description>Dryer</Description>
      </EquipmentModule>
      <EquipmentModule ID="EXTRUDER">
        <Description>Extruder</Description>
      </EquipmentModule>
    </Unit>
  </ProcessCell>
  
  <MasterRecipe ID="PC_PLANT_RECIPE">
    <Description>Master recipe for Polycarbonate</Description>
    <ProductID>POLYCARBONATE</ProductID>
    
    <UnitProcedure ID="PC_PLANT_UP">
      <Description>Unit procedure for synthesis</Description>
      
      <Operation ID="OP_01">
        <Description>Operation 1</Description>
        <Phase ID="DISSOLVE">
          <Description>Dissolve 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="POLYMERIZE">
          <Description>Polymerize 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="WASH">
          <Description>Wash 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="PRECIPITATE">
          <Description>Precipitate 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="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>
      
      <Operation ID="OP_06">
        <Description>Operation 6</Description>
        <Phase ID="PELLETIZE">
          <Description>Pelletize 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>

**Key S88 Concepts:**
- **Process Cell**: The physical grouping containing all equipment for this process
- **Unit**: The major equipment that performs the synthesis
- **Equipment Modules**: Individual pieces of equipment (reactors, columns, etc.)
- **Unit Procedure**: The sequence of operations to produce the product
- **Phases**: The lowest level of procedural control (e.g., REACT, SEPARATE, PURIFY)

Key S88 Concepts:
• Process Cell: Physical grouping containing all equipment
• Unit: Major equipment performing synthesis
• Equipment Modules: Individual pieces (reactors, columns, etc.)
• Phases: Lowest level of procedural control (REACT, SEPARATE, etc.)

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This Synthesis Module is part of the 100chemicals Olefinverbund — an integrated chemical production network designed for extraterrestrial civilization on Moon and Mars.