Ammonium Sulfate

Molecular Structure

Molecular Details

Molecular Formula	(NH₄)₂SO₄
Molecular Weight	132.14 g/mol
State	Solid at standard conditions

Olefinverbund Integration

Chemistry & Engineering

Reaction Equation	2NH₃ + H₂SO₄ → (NH₄)₂SO₄
Thermodynamics	Exothermic neutralization
Catalyst System	None
Reactor Class	Crystallizer
Process Considerations	Often recovered from Caprolactam byproduct stream.

Extraterrestrial Production Pattern

1. NH₃ + H₂SO₄ → (NH₄)₂SO₄ (neutralization)
2. Caprolactam byproduct (major source)
3. Coke oven gas ammonia recovery
4. Crystallization and drying

Applications

• Nitrogen fertilizer (21% N)
• Sulfur fertilizer for S-deficient soils
• Food additive
• Flame retardant

Reaction Diagram

Overall Reaction: 2NH3 + H2SO4 -> (NH4)2SO4

Unit Operations

Process steps following chemical engineering unit operation principles:

Step	Operation	Description
1	Saturation	Saturate mother liquor with NH₃
2	Neutralization	Add H₂SO₄ to form (NH₄)₂SO₄
3	Crystallization	Cool to crystallize ammonium sulfate
4	Centrifugation	Separate crystals from liquor
5	Drying	Dry in rotary dryer
6	Screening	Size classification and packaging

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 Ammonium Sulfate -->
<!-- Educational schema - simplified for demonstration -->
<BatchML xmlns="http://www.wbf.org/xml/B2MML-V0600">
  
  <ProcessCell ID="AMMONIUM_SULFATE_PLANT_CELL">
    <Description>Process cell for Ammonium Sulfate production</Description>
    
    <Unit ID="AMMONIUM_SULFATE_PLANT">
      <Description>Main synthesis unit</Description>
      
      <!-- Equipment Modules -->
      <EquipmentModule ID="SATURATOR">
        <Description>Saturator</Description>
      </EquipmentModule>
      <EquipmentModule ID="REACTOR">
        <Description>Reactor</Description>
      </EquipmentModule>
      <EquipmentModule ID="CRYSTALLIZER">
        <Description>Crystallizer</Description>
      </EquipmentModule>
      <EquipmentModule ID="CENTRIFUGE">
        <Description>Centrifuge</Description>
      </EquipmentModule>
      <EquipmentModule ID="DRYER">
        <Description>Dryer</Description>
      </EquipmentModule>
      <EquipmentModule ID="SCREENER">
        <Description>Screener</Description>
      </EquipmentModule>
    </Unit>
  </ProcessCell>
  
  <MasterRecipe ID="AMMONIUM_SULFATE_PLANT_RECIPE">
    <Description>Master recipe for Ammonium Sulfate</Description>
    <ProductID>AMMONIUM_SULFATE</ProductID>
    
    <UnitProcedure ID="AMMONIUM_SULFATE_PLANT_UP">
      <Description>Unit procedure for synthesis</Description>
      
      <Operation ID="OP_01">
        <Description>Operation 1</Description>
        <Phase ID="SATURATE">
          <Description>Saturate 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="NEUTRALIZE">
          <Description>Neutralize 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="CRYSTALLIZE">
          <Description>Crystallize 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="CENTRIFUGE">
          <Description>Centrifuge 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="DRY">
          <Description>Dry 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="SCREEN">
          <Description>Screen 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.