Ethylene Glycol

Molecular Structure

Molecular Details

Molecular Formula	HOCH₂CH₂OH
Molecular Weight	62.07 g/mol
State	Liquid at standard conditions

Olefinverbund Integration

Chemistry & Engineering

Reaction Equation	C₂H₄O + H₂O → HOCH₂CH₂OH
Thermodynamics	Exothermic hydration
Catalyst System	None (thermal) or Acid/Base
Reactor Class	Plug flow reactor with high water ratio to prevent polymerization
Process Considerations	Excess water evaporation is the main energy cost.

Extraterrestrial Production Pattern

1. Ethylene oxidation to ethylene oxide (Ag catalyst)
2. Hydration of ethylene oxide with water
3. Thermal or catalytic hydrolysis at 150-200°C
4. Multi-effect evaporation for purification

Applications

• Antifreeze and coolant
• PET polyester production (with terephthalic acid)
• Heat transfer fluids
• Deicing fluids

Reaction Diagram

Overall Reaction: C2H4O + H2O -> HOCH2CH2OH

Unit Operations

Process steps following chemical engineering unit operation principles:

Step	Operation	Description
1	EO/Water Mixing	Mix ethylene oxide with excess water (10:1)
2	Hydrolysis	Thermal or catalytic hydrolysis at 150-200°C
3	Dehydration	Multi-effect evaporation to remove water
4	MEG Distillation	Vacuum distillation to separate MEG from DEG/TEG
5	DEG Recovery	Recover diethylene glycol as co-product
6	Product Finishing	Final purification and quality control

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 Glycol -->
<!-- Educational schema - simplified for demonstration -->
<BatchML xmlns="http://www.wbf.org/xml/B2MML-V0600">
  
  <ProcessCell ID="MEG_PLANT_CELL">
    <Description>Process cell for Ethylene Glycol production</Description>
    
    <Unit ID="MEG_PLANT">
      <Description>Main synthesis unit</Description>
      
      <!-- Equipment Modules -->
      <EquipmentModule ID="MIXER">
        <Description>Mixer</Description>
      </EquipmentModule>
      <EquipmentModule ID="REACTOR">
        <Description>Reactor</Description>
      </EquipmentModule>
      <EquipmentModule ID="EVAPORATOR">
        <Description>Evaporator</Description>
      </EquipmentModule>
      <EquipmentModule ID="MEG_COLUMN">
        <Description>Meg Column</Description>
      </EquipmentModule>
      <EquipmentModule ID="DEG_COLUMN">
        <Description>Deg Column</Description>
      </EquipmentModule>
      <EquipmentModule ID="PRODUCT_TANK">
        <Description>Product Tank</Description>
      </EquipmentModule>
    </Unit>
  </ProcessCell>
  
  <MasterRecipe ID="MEG_PLANT_RECIPE">
    <Description>Master recipe for Ethylene Glycol</Description>
    <ProductID>ETHYLENE_GLYCOL</ProductID>
    
    <UnitProcedure ID="MEG_PLANT_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="HYDROLYZE">
          <Description>Hydrolyze 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="EVAPORATE">
          <Description>Evaporate 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="DISTILL_MEG">
          <Description>Distill Meg 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="RECOVER_DEG">
          <Description>Recover Deg 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="FINISH">
          <Description>Finish 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.)

---

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