Sodium Hydroxide

Molecular Structure

Molecular Details

Molecular Formula	NaOH
Molecular Weight	40.00 g/mol
State	Solid (flakes) or aqueous solution

Olefinverbund Integration

Chemistry & Engineering

Reaction Equation	Chlor-Alkali Electrolysis
Thermodynamics	Driven by electricity
Catalyst System	Membrane (Nafion)
Reactor Class	Cell stack
Process Considerations	Produced as 33% or 50% solution.

Extraterrestrial Production Pattern

1. Electrolysis of NaCl brine (membrane cell technology)
2. Cathode reaction: 2H₂O + 2e⁻ → H₂ + 2OH⁻
3. Combination with Na⁺ migrating through membrane
4. Evaporation for concentrated solution or solid

Applications

• Pulp and paper production
• Soap and detergent manufacturing
• Alumina refining (Bayer process)
• Chemical synthesis and pH control

Reaction Diagram

Overall Reaction: 2NaCl + 2H2O -> 2NaOH + Cl2 + H2

Unit Operations

Process steps following chemical engineering unit operation principles:

Step	Operation	Description
1	Brine Preparation	Saturate and purify NaCl brine
2	Electrolysis	Membrane cell electrolysis
3	NaOH Concentration	Evaporate to 50% NaOH
4	Further Concentration	Evaporate to 70-73% if needed
5	Flaking	Cool molten NaOH on drum for solid flakes
6	Storage	Store under inert atmosphere

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 Sodium Hydroxide -->
<!-- Educational schema - simplified for demonstration -->
<BatchML xmlns="http://www.wbf.org/xml/B2MML-V0600">
  
  <ProcessCell ID="CAUSTIC_PRODUCTION_CELL">
    <Description>Process cell for Sodium Hydroxide production</Description>
    
    <Unit ID="CAUSTIC_PRODUCTION">
      <Description>Main synthesis unit</Description>
      
      <!-- Equipment Modules -->
      <EquipmentModule ID="BRINE_SYSTEM">
        <Description>Brine System</Description>
      </EquipmentModule>
      <EquipmentModule ID="ELECTROLYZER">
        <Description>Electrolyzer</Description>
      </EquipmentModule>
      <EquipmentModule ID="EVAPORATOR_1">
        <Description>Evaporator 1</Description>
      </EquipmentModule>
      <EquipmentModule ID="EVAPORATOR_2">
        <Description>Evaporator 2</Description>
      </EquipmentModule>
      <EquipmentModule ID="FLAKER">
        <Description>Flaker</Description>
      </EquipmentModule>
      <EquipmentModule ID="STORAGE_TANK">
        <Description>Storage Tank</Description>
      </EquipmentModule>
    </Unit>
  </ProcessCell>
  
  <MasterRecipe ID="CAUSTIC_PRODUCTION_RECIPE">
    <Description>Master recipe for Sodium Hydroxide</Description>
    <ProductID>SODIUM_HYDROXIDE</ProductID>
    
    <UnitProcedure ID="CAUSTIC_PRODUCTION_UP">
      <Description>Unit procedure for synthesis</Description>
      
      <Operation ID="OP_01">
        <Description>Operation 1</Description>
        <Phase ID="BRINE_PREP">
          <Description>Brine Prep 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="ELECTROLYZE">
          <Description>Electrolyze 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_1">
          <Description>Evaporate 1 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="EVAPORATE_2">
          <Description>Evaporate 2 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="FLAKE">
          <Description>Flake 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="STORE">
          <Description>Store 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.