Propylene Oxide

C₃H₆O · 58.08 g/mol

C₃H₆O

Intermediate for polyurethanes and propylene glycol

Molecular Weight

58.08 g/mol

State

Liquid

Catalyst

Titanium Silicalite-1 (T

Reactor

Fixed bed or Slurry

Propylene Oxide molecular structure — 2D structure

Olefinverbund Integration

Inputs

Propylene, Hydrogen Peroxide

→

Product

Propylene Oxide

→

Outputs

Propylene Glycol, Polyols

Chemistry & Engineering

Reaction	`Propylene + H₂O₂ → PO + H₂O (HPPO Process)`
Thermodynamics	Exothermic
Catalyst	Titanium Silicalite-1 (TS-1)
Reactor class	Fixed bed or Slurry
Note	Avoids chorine/waste of older chlorohydrin process. Ideal for closed loops.

Applications

Polyether polyols for polyurethanes
Propylene glycol production
Polyester resins
Solvent and fuel additive

Extraterrestrial Production Pattern

HPPO process: propylene + H₂O₂ over TS-1 zeolite
PO/SM process: ethylbenzene hydroperoxide route
Chlorohydrin process (older, more waste)
Distillation for purification

Reaction Diagram

C3H6 + H2O2 -> C3H6O + H2O (HPPO process)

Unit Operations

Process steps following chemical engineering unit operation principles

#	Operation	Description
1	Propylene/H₂O₂ Feed	Mix propylene with H₂O₂ in methanol
2	Epoxidation	TS-1 zeolite catalyst at 40-60°C
3	PO Separation	Distill PO from methanol/water
4	Methanol Recovery	Recover and recycle methanol
5	PO Purification	Distill to >99.9% PO
6	Propylene Recycle	Return unreacted propylene

S88 Batch Control Model

ISA-88 BatchML schema — simplified for educational purposes

<?xml version="1.0" encoding="UTF-8"?>
<!-- ISA-88 Batch Control Model for Propylene Oxide -->
<!-- Educational schema - simplified for demonstration -->
<BatchML xmlns="http://www.wbf.org/xml/B2MML-V0600">
  
  <ProcessCell ID="PO_HPPO_PLANT_CELL">
    <Description>Process cell for Propylene Oxide production</Description>
    
    <Unit ID="PO_HPPO_PLANT">
      <Description>Main synthesis unit</Description>
      
      <!-- Equipment Modules -->
      <EquipmentModule ID="MIXER">
        <Description>Mixer</Description>
      </EquipmentModule>
      <EquipmentModule ID="REACTOR">
        <Description>Reactor</Description>
      </EquipmentModule>
      <EquipmentModule ID="PO_COLUMN">
        <Description>Po Column</Description>
      </EquipmentModule>
      <EquipmentModule ID="MEOH_COLUMN">
        <Description>Meoh Column</Description>
      </EquipmentModule>
      <EquipmentModule ID="PURIFICATION">
        <Description>Purification</Description>
      </EquipmentModule>
      <EquipmentModule ID="RECYCLE_SYSTEM">
        <Description>Recycle System</Description>
      </EquipmentModule>
    </Unit>
  </ProcessCell>
  
  <MasterRecipe ID="PO_HPPO_PLANT_RECIPE">
    <Description>Master recipe for Propylene Oxide</Description>
    <ProductID>PROPYLENE_OXIDE</ProductID>
    
    <UnitProcedure ID="PO_HPPO_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="EPOXIDIZE">
          <Description>Epoxidize 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="SEPARATE_PO">
          <Description>Separate Po 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="RECOVER_MEOH">
          <Description>Recover Meoh 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="PURIFY">
          <Description>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="RECYCLE">
          <Description>Recycle 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>

Process CellPhysical grouping of all production equipment

UnitMajor equipment performing the synthesis

Equipment ModulesIndividual devices: reactors, columns, absorbers

PhasesLowest control level: REACT, SEPARATE, PURIFY

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