Dimethyl Ether

CH₃OCH₃ · 46.07 g/mol

CH₃OCH₃

Clean fuel and aerosol propellant

Molecular Weight

46.07 g/mol

State

Gas

Catalyst

Acidic Zeolite or Alumin

Reactor

Fixed bed adiabatic

Dimethyl Ether molecular structure — 2D structure

Olefinverbund Integration

Inputs

Methanol

→

Product

Dimethyl Ether

→

Outputs

Fuel, Propellant

Chemistry & Engineering

Reaction	`2 CH₃OH → CH₃OCH₃ + H₂O`
Thermodynamics	Exothermic dehydration
Catalyst	Acidic Zeolite or Alumina
Reactor class	Fixed bed adiabatic
Note	Clean burning diesel alternative.

Applications

Diesel substitute (clean combustion)
Aerosol propellant (replaces CFCs)
LPG blending
Fuel cell hydrogen carrier

Extraterrestrial Production Pattern

Methanol dehydration over γ-Al₂O₃ or zeolite catalyst
Operating at 250-400°C
Direct synthesis from syngas possible
Liquefaction under mild pressure

Reaction Diagram

2 CH3OH -> CH3OCH3 + H2O

Unit Operations

Process steps following chemical engineering unit operation principles

#	Operation	Description
1	Methanol Vaporization	Vaporize methanol feed
2	Dehydration	γ-Al₂O₃ catalyst at 250-350°C
3	Cooling	Cool reactor effluent
4	Water Separation	Condense and separate water
5	DME Distillation	Distill to >99.9% DME
6	Compression	Compress/liquefy DME for storage

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 Dimethyl Ether -->
<!-- Educational schema - simplified for demonstration -->
<BatchML xmlns="http://www.wbf.org/xml/B2MML-V0600">
  
  <ProcessCell ID="DME_PLANT_CELL">
    <Description>Process cell for Dimethyl Ether production</Description>
    
    <Unit ID="DME_PLANT">
      <Description>Main synthesis unit</Description>
      
      <!-- Equipment Modules -->
      <EquipmentModule ID="VAPORIZER">
        <Description>Vaporizer</Description>
      </EquipmentModule>
      <EquipmentModule ID="REACTOR">
        <Description>Reactor</Description>
      </EquipmentModule>
      <EquipmentModule ID="COOLER">
        <Description>Cooler</Description>
      </EquipmentModule>
      <EquipmentModule ID="SEPARATOR">
        <Description>Separator</Description>
      </EquipmentModule>
      <EquipmentModule ID="COLUMN">
        <Description>Column</Description>
      </EquipmentModule>
      <EquipmentModule ID="COMPRESSOR">
        <Description>Compressor</Description>
      </EquipmentModule>
    </Unit>
  </ProcessCell>
  
  <MasterRecipe ID="DME_PLANT_RECIPE">
    <Description>Master recipe for Dimethyl Ether</Description>
    <ProductID>DIMETHYL_ETHER</ProductID>
    
    <UnitProcedure ID="DME_PLANT_UP">
      <Description>Unit procedure for synthesis</Description>
      
      <Operation ID="OP_01">
        <Description>Operation 1</Description>
        <Phase ID="VAPORIZE">
          <Description>Vaporize 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="DEHYDRATE">
          <Description>Dehydrate 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="COOL">
          <Description>Cool 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="SEPARATE">
          <Description>Separate 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="COMPRESS">
          <Description>Compress 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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