Ethylene Oxide

Molecular Structure

Molecular Details

Molecular Formula	C₂H₄O
Molecular Weight	44.05 g/mol
State	Gas at standard conditions

Olefinverbund Integration

Chemistry & Engineering

Reaction Equation	C₂H₄ + 0.5 O₂ → C₂H₄O
Thermodynamics	Exothermic; competes with full combustion
Catalyst System	Silver on α-Alumina
Reactor Class	Shell-and-tube reactor with coolant circulation
Process Considerations	Explosion hazard. Selectivity is critical (~90%).

Extraterrestrial Production Pattern

1. Ethylene + O₂ over silver catalyst (Ag/Al₂O₃)
2. Operating at 200-300°C and 10-20 bar
3. Promoted with Cs and Cl for selectivity
4. Absorption and distillation for purification

Applications

• Ethylene glycol production
• Ethoxylated surfactants
• Ethanolamine synthesis
• Sterilization agent

Reaction Diagram

Overall Reaction: C2H4 + 1/2 O2 -> C2H4O

Unit Operations

Process steps following chemical engineering unit operation principles:

Step	Operation	Description
1	Feed Mixing	Mix ethylene with air/oxygen (2-8% C₂H₄)
2	Catalytic Oxidation	Fixed-bed reactor with Ag/Al₂O₃ catalyst at 200-300°C
3	Absorption	Absorb EO in water from reactor effluent
4	Stripping	Strip EO from water with steam
5	Purification	Distill to remove CO₂ and aldehydes
6	Recycle	Return unreacted ethylene to reactor

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 Ethylene Oxide -->
<!-- Educational schema - simplified for demonstration -->
<BatchML xmlns="http://www.wbf.org/xml/B2MML-V0600">
  
  <ProcessCell ID="EO_SYNTHESIS_CELL">
    <Description>Process cell for Ethylene Oxide production</Description>
    
    <Unit ID="EO_SYNTHESIS">
      <Description>Main synthesis unit</Description>
      
      <!-- Equipment Modules -->
      <EquipmentModule ID="MIXER">
        <Description>Mixer</Description>
      </EquipmentModule>
      <EquipmentModule ID="REACTOR">
        <Description>Reactor</Description>
      </EquipmentModule>
      <EquipmentModule ID="ABSORBER">
        <Description>Absorber</Description>
      </EquipmentModule>
      <EquipmentModule ID="STRIPPER">
        <Description>Stripper</Description>
      </EquipmentModule>
      <EquipmentModule ID="DISTILLATION">
        <Description>Distillation</Description>
      </EquipmentModule>
      <EquipmentModule ID="RECYCLE_COMPRESSOR">
        <Description>Recycle Compressor</Description>
      </EquipmentModule>
    </Unit>
  </ProcessCell>
  
  <MasterRecipe ID="EO_SYNTHESIS_RECIPE">
    <Description>Master recipe for Ethylene Oxide</Description>
    <ProductID>ETHYLENE_OXIDE</ProductID>
    
    <UnitProcedure ID="EO_SYNTHESIS_UP">
      <Description>Unit procedure for synthesis</Description>
      
      <Operation ID="OP_01">
        <Description>Operation 1</Description>
        <Phase ID="MIX">
          <Description>Mix 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="OXIDIZE">
          <Description>Oxidize 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="ABSORB">
          <Description>Absorb 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="STRIP">
          <Description>Strip 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="PURIFY">
          <Description>Purify 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="RECYCLE">
          <Description>Recycle 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.