2CH₄O→givesC₂H₆O+H₂O

Species

In the processes

• Chloromethane from methanol and hydrogen chloride (gas-phase hydrochlorination, 100 kt/a)Concept · not reviewed

  DME_FORMATION2 CH3OH → CH3OCH3 + H2O (dimethyl ether, the main by-product)

  Element balance

  Balances in every element

  Catalyst

  gamma-alumina (fixed bed)

• Formaldehyde by methanol oxidation over iron molybdate (Formox type, 20 t/h formalin 50 wt%)Concept · not reviewed

  DME_FORM2 CH3OH → CH3OCH3 + H2O

  Element balance

  Balances in every element

  Catalyst

  Iron molybdate (Formox) · active phase Fe2(MoO4)3 with excess MoO3

  Operating window

  543.15–703.15 K (270–430 °C), 100–200 kPa (1–2 bar) (given: BREF LVOC 2017 section 6.2.3, p. 339: atmospheric pressure, 270-430 C; pressure upper bound ASSUMED (blower discharge, D-005))

  Poisons

  molybdenum loss (MoO3 sublimation at hot spots), iron carbonyl

• Isobutene by MTBE cracking (50 kt/a, gas-phase cleavage)Concept · not reviewed

  DMEF2 CH4O → C2H6O + H2O

  Element balance

  Balances in every element

  Heat of reaction

  ΔH = -24,442 kJ/kmol at 298.15 K, as written (calculated: ideal-gas formation enthalpies of process/materials.yaml at 298.15 K (-184020 - 241822 + 2 x 200700 kJ/kmol))

  Catalyst

  same acidic catalyst (side reaction)

Sources

What the processes cite for this reaction, each source once: for the reaction itself, its conversion, its heat of reaction or its catalyst. As the processes write them; DOIs, US patent numbers and web addresses are linked.

1. US 4,794,204 (description): crude methyl chloride from the alumina process holds 0.3-2 % DME

   For the reaction · cited by Chloromethane from methanol and hydrogen chloride (gas-phase hydrochlorination, 100 kt/a)

2. WO 2000/076658 A1: DME is the main by-product on gamma-alumina

   For the reaction · cited by Chloromethane from methanol and hydrogen chloride (gas-phase hydrochlorination, 100 kt/a)

3. EU JRC (2017) BREF LVOC, section 6.2.3, p. 339 (dimethyl ether a by-product) and Table 6.6, p. 344

   For the reaction · cited by Formaldehyde by methanol oxidation over iron molybdate (Formox type, 20 t/h formalin 50 wt%)

4. EU JRC (2017) BREF LVOC, EUR 28882 EN, section 6.2.3 (catalyst life 5-30 months) and 6.3.5 (spent catalyst 0.02-0.15 kg/t HCHO)

   For the catalyst · cited by Formaldehyde by methanol oxidation over iron molybdate (Formox type, 20 t/h formalin 50 wt%)

5. US 8,633,345 B2: dimethyl ether formed from methanol as the main by-product of the cleavage

   For the reaction · cited by Isobutene by MTBE cracking (50 kt/a, gas-phase cleavage)

6. ideal-gas formation enthalpies of process/materials.yaml at 298.15 K (-184020 - 241822 + 2 x 200700 kJ/kmol)

   For the heat of reaction · cited by Isobutene by MTBE cracking (50 kt/a, gas-phase cleavage)