Acrylic Acid

Molecular Structure

Molecular Details

Molecular Formula	CH₂=CHCOOH
Molecular Weight	72.06 g/mol
State	Liquid at standard conditions

Olefinverbund Integration

Chemistry & Engineering

Reaction Equation	C₃H₆ + 1.5 O₂ → C₂H₃COOH + H₂O
Thermodynamics	Highly exothermic oxidation
Catalyst System	Bismuth-Molybdate (1st stage), Molybdenum-Vanadium (2nd stage)
Reactor Class	Salt-cooled shell-and-tube fixed bed reactors (2 stages)
Process Considerations	Runaway reaction risk; careful temperature control required.

Extraterrestrial Production Pattern

1. Propylene → acrolein (first oxidation step)
2. Acrolein → acrylic acid (second oxidation step)
3. Mixed metal oxide catalysts (Mo-Bi and Mo-V)
4. Distillation with polymerization inhibitors

Applications

• Superabsorbent polymers (diapers)
• Acrylate esters for coatings
• Polyacrylic acid thickeners
• Adhesives and sealants

Reaction Diagram

Overall Reaction: CH2=CHCHO + 1/2 O2 -> CH2=CHCOOH

Unit Operations

Process steps following chemical engineering unit operation principles:

Step	Operation	Description
1	Acrolein Feed	Vaporize acrolein and mix with air
2	Oxidation Stage 2	Mo-V oxide catalyst at 200-280°C
3	Absorption	Absorb acrylic acid in water
4	Extraction	Extract with solvent from aqueous phase
5	Distillation	Vacuum distillation with inhibitor
6	Stabilization	Add MEHQ inhibitor for storage

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 Acrylic Acid -->
<!-- Educational schema - simplified for demonstration -->
<BatchML xmlns="http://www.wbf.org/xml/B2MML-V0600">
  
  <ProcessCell ID="ACRYLIC_ACID_PLANT_CELL">
    <Description>Process cell for Acrylic Acid production</Description>
    
    <Unit ID="ACRYLIC_ACID_PLANT">
      <Description>Main synthesis unit</Description>
      
      <!-- Equipment Modules -->
      <EquipmentModule ID="VAPORIZER">
        <Description>Vaporizer</Description>
      </EquipmentModule>
      <EquipmentModule ID="REACTOR">
        <Description>Reactor</Description>
      </EquipmentModule>
      <EquipmentModule ID="ABSORBER">
        <Description>Absorber</Description>
      </EquipmentModule>
      <EquipmentModule ID="EXTRACTOR">
        <Description>Extractor</Description>
      </EquipmentModule>
      <EquipmentModule ID="VACUUM_COLUMN">
        <Description>Vacuum Column</Description>
      </EquipmentModule>
      <EquipmentModule ID="STORAGE">
        <Description>Storage</Description>
      </EquipmentModule>
    </Unit>
  </ProcessCell>
  
  <MasterRecipe ID="ACRYLIC_ACID_PLANT_RECIPE">
    <Description>Master recipe for Acrylic Acid</Description>
    <ProductID>ACRYLIC_ACID</ProductID>
    
    <UnitProcedure ID="ACRYLIC_ACID_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="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="EXTRACT">
          <Description>Extract 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="DISTILL">
          <Description>Distill 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="STABILIZE">
          <Description>Stabilize 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.