Propylene

Molecular Structure

Molecular Details

Molecular Formula	C₃H₆
Molecular Weight	42.08 g/mol
State	Gas at standard conditions

Olefinverbund Integration

Chemistry & Engineering

Reaction Equation	3CH₃OH → C₃H₆ + 3H₂O
Thermodynamics	Exothermic overall from methanol (-50 kJ/mol)
Catalyst System	SAPO-34 (small pore zeolite) maximizes propylene selectivity
Reactor Class	Fluidized bed reactor (400-500°C) with continuous catalyst regeneration
Process Considerations	Primary byproduct of MTO process. Ratio of C2:C3 can be tuned by catalyst acidity and temperature.

Extraterrestrial Production Pattern

1. Produce methanol from CO₂ + H₂
2. MTO conversion over zeolite catalyst (ZSM-5 or SAPO-34)
3. Separation and purification of propylene fraction
4. Alternative: Direct FT synthesis with selective catalysts

Applications

• Polypropylene production
• Propylene oxide
• Acrylonitrile synthesis
• Cumene and phenol production

Reaction Diagram

Overall Reaction: CH3OH -> C3H6 + H2O (MTO)

Unit Operations

Process steps following chemical engineering unit operation principles:

Step	Operation	Description
1	Methanol Vaporization	Vaporize liquid methanol feed
2	MTO Reaction	Fluidized-bed reactor with SAPO-34 zeolite at 450-550°C
3	Quenching	Cool reactor effluent with water spray
4	Compression	Compress product gas
5	Separation	Cryogenic separation of C₂/C₃ olefins
6	C3 Splitter	Separate propylene from propane

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 Propylene -->
<!-- Educational schema - simplified for demonstration -->
<BatchML xmlns="http://www.wbf.org/xml/B2MML-V0600">
  
  <ProcessCell ID="PROPYLENE_MTO_CELL">
    <Description>Process cell for Propylene production</Description>
    
    <Unit ID="PROPYLENE_MTO">
      <Description>Main synthesis unit</Description>
      
      <!-- Equipment Modules -->
      <EquipmentModule ID="VAPORIZER">
        <Description>Vaporizer</Description>
      </EquipmentModule>
      <EquipmentModule ID="REACTOR">
        <Description>Reactor</Description>
      </EquipmentModule>
      <EquipmentModule ID="QUENCH_TOWER">
        <Description>Quench Tower</Description>
      </EquipmentModule>
      <EquipmentModule ID="COMPRESSOR">
        <Description>Compressor</Description>
      </EquipmentModule>
      <EquipmentModule ID="COLD_BOX">
        <Description>Cold Box</Description>
      </EquipmentModule>
      <EquipmentModule ID="SPLITTER">
        <Description>Splitter</Description>
      </EquipmentModule>
    </Unit>
  </ProcessCell>
  
  <MasterRecipe ID="PROPYLENE_MTO_RECIPE">
    <Description>Master recipe for Propylene</Description>
    <ProductID>PROPYLENE</ProductID>
    
    <UnitProcedure ID="PROPYLENE_MTO_UP">
      <Description>Unit procedure for synthesis</Description>
      
      <Operation ID="OP_01">
        <Description>Operation 1</Description>
        <Phase ID="VAPORIZE">
          <Description>Vaporize 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="REACT">
          <Description>React 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="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_04">
        <Description>Operation 4</Description>
        <Phase ID="COMPRESS">
          <Description>Compress 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="SEPARATE">
          <Description>Separate 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="SPLIT">
          <Description>Split 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.