Ethylbenzene

Molecular Structure

Molecular Details

Molecular Formula	C₆H₅C₂H₅
Molecular Weight	106.17 g/mol
State	Liquid at standard conditions

Olefinverbund Integration

Chemistry & Engineering

Reaction Equation	C₆H₆ + C₂H₄ → C₆H₅C₂H₅
Thermodynamics	Exothermic alkylation
Catalyst System	Zeolite MCM-22 (liquid phase) or ZSM-5 (vapor)
Reactor Class	Fixed bed liquid-phase alkylation
Process Considerations	Requires excess benzene to prevent poly-alkylation; unconverted benzene is recycled.

Extraterrestrial Production Pattern

1. Benzene + ethylene → ethylbenzene
2. Zeolite catalyst (ZSM-5 or MCM-22) in vapor phase
3. AlCl₃ catalyst (older liquid-phase process)
4. Distillation for purification

Applications

• Styrene production (dehydrogenation)
• Solvent
• Fuel additive

Reaction Diagram

Overall Reaction: C6H6 + C2H4 -> C6H5C2H5

Unit Operations

Process steps following chemical engineering unit operation principles:

Step	Operation	Description
1	Benzene/Ethylene Feed	Dry and purify feed streams
2	Alkylation	Zeolite (ZSM-5) or AlCl₃ catalyst at 200-450°C
3	Transalkylation	Convert polyethylbenzenes to EB with benzene
4	Benzene Recovery	Distill to recover unreacted benzene
5	EB Purification	Distill to >99.8% ethylbenzene
6	DEB Recovery	Recover diethylbenzene for recycle

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 Ethylbenzene -->
<!-- Educational schema - simplified for demonstration -->
<BatchML xmlns="http://www.wbf.org/xml/B2MML-V0600">
  
  <ProcessCell ID="ETHYLBENZENE_PLANT_CELL">
    <Description>Process cell for Ethylbenzene production</Description>
    
    <Unit ID="ETHYLBENZENE_PLANT">
      <Description>Main synthesis unit</Description>
      
      <!-- Equipment Modules -->
      <EquipmentModule ID="DRYER">
        <Description>Dryer</Description>
      </EquipmentModule>
      <EquipmentModule ID="ALKYLATOR">
        <Description>Alkylator</Description>
      </EquipmentModule>
      <EquipmentModule ID="TRANSALKYLATOR">
        <Description>Transalkylator</Description>
      </EquipmentModule>
      <EquipmentModule ID="BENZENE_COLUMN">
        <Description>Benzene Column</Description>
      </EquipmentModule>
      <EquipmentModule ID="EB_COLUMN">
        <Description>Eb Column</Description>
      </EquipmentModule>
      <EquipmentModule ID="DEB_COLUMN">
        <Description>Deb Column</Description>
      </EquipmentModule>
    </Unit>
  </ProcessCell>
  
  <MasterRecipe ID="ETHYLBENZENE_PLANT_RECIPE">
    <Description>Master recipe for Ethylbenzene</Description>
    <ProductID>ETHYLBENZENE</ProductID>
    
    <UnitProcedure ID="ETHYLBENZENE_PLANT_UP">
      <Description>Unit procedure for synthesis</Description>
      
      <Operation ID="OP_01">
        <Description>Operation 1</Description>
        <Phase ID="FEED">
          <Description>Feed 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="ALKYLATE">
          <Description>Alkylate 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="TRANSALKYLATE">
          <Description>Transalkylate 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="BENZENE_REC">
          <Description>Benzene Rec 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="EB_PURIFY">
          <Description>Eb 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="DEB_REC">
          <Description>Deb Rec 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.