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Synthesis of DMDCS Rochow Direct Method [1]

Synthesis of DMDCS Rochow Direct Method [1]. 化工四 B95504052 林文翔 B95504050 劉邦彥 B95504048 彭子軒. Picture is modified and form ref.2. Synthesis of DMDCS. Method1. Grinard method CH 3 MgCl+SiCl 4 → (CH 3 )SiCl 3 +MgCl 2 CH 3 MgCl+CH 3 SiCl 3 → (CH 3 ) 2 SiCl 2 +MgCl 2 Drawbacks:

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Synthesis of DMDCS Rochow Direct Method [1]

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  1. Synthesis of DMDCSRochow Direct Method[1] 化工四 B95504052 林文翔 B95504050 劉邦彥 B95504048 彭子軒 Picture is modified and form ref.2

  2. Synthesisof DMDCS • Method1. Grinard method CH3MgCl+SiCl4→(CH3)SiCl3+MgCl2 CH3MgCl+CH3SiCl3→(CH3)2SiCl2+MgCl2 • Drawbacks: • Process isn’t selective. • Getting pure products by distillation of 120 plate columns. • Grignard reagent is expensive. Picture is form ref.2

  3. Synthesisof DMDCS • Method2. Direct method(1940-1945 Rochow @ G.E.) 2CH3Cl + Si/Cu2O → (CH3)2SiCl2 • Advantages: • Simple • High purity and less cost. M=CH3Cl Furnace 370 ˚C Condenser

  4. Flow chart Recycle Mixed product Products Discharge &preheat Picture is modified and form ref.2

  5. Cyclone separator Feed Feed Si Output Si Output Flow chart Picture is modified and form ref.5

  6. Fluid Energy Jet Mill Feed Crushing Classifying Flow chart Picture is modified and form ref.3

  7. Products • Recycle material: Methyl chloride • CH3Cl -24.2˚C [4] • Main product: Methylchlorosilanes • (CH3)2SiCl270˚C • CH3SiCl3 65.7˚C • (CH3)3SiCl 57.3˚C • Many otherbyproducts (only 1%): • Disilanes (CH3)3Si2(CH3)3 113˚C [4] • Silaalkanes Cl3SiCH2SiCl3 179.5˚C [4] • SiloxanesC6H18OSi2 101˚C [4] • Hydrocarbons C2H6 -88.6˚C [4] Flow chart

  8. Separation by fractional distillation Picture is modified and form ref.2

  9. Future work • Reactor of Rochow synthesis

  10. References • 1. ROCHOW, E., The Direct Synthesis of Organosilicon Compounds. 1945. • 2. Seyferth, D., Dimethyldichlorosilane and the Direct Synthesis ofMethylchlorosilanes. The Key to the Silicones Industry. 2001,p8-14 Massachusetts Institute of Technology. • 3.http://www.nisshineng.com/eng/index.html Fluid energy jet mill. • 4. http://www.wolframalpha.com • 5. Coulson,Richardson’sChemical Engineering p.50

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