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PDMS process overview

PDMS process overview. 化工四 B95504048 彭子軒 B95504050 劉邦彥 B95504052 林文翔. Solid transport to reactor in Rochow synthesis process. Dp of our Silicon particle is 100~6000 mesh => Dp = 0.55~33.33 μ m ( 1 μ m = 180 mesh). Screw conveyor.

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PDMS process overview

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  1. PDMS process overview 化工四 B95504048 彭子軒 B95504050 劉邦彥 B95504052 林文翔

  2. Solid transport to reactor in Rochow synthesis process Dp of our Silicon particle is 100~6000 mesh =>Dp = 0.55~33.33 μm (1 μm = 180 mesh) Screw conveyor

  3. The reactor for Rochow synthesis--- fluidized bed reactor Bed hight=? Trying to estimate the packed height and the reactor volume are both our goals. Mass flow rate=?

  4. PDMS synthesis • Target: linearPDMS Origin ,functionality ,and field of application of silicone structural units

  5. Previous step • Hydrolysis: Cyclic D4~7 linear Dn (n=4~100,molarcularweight distribution is very wide.) BUT… : = 1:1 This is a BAD news!!!

  6. The monomer synthesis and polymerization process D4 and D5 are main products 1. Cyclization process: 2. Ring-opening polymerization process: D4 and D5 are major industrial products ,which are either marketed as such or used for the production of PDMS

  7. Flow chart Hydrolysis DMDCS Rochow synthesis Cyclization DMDCS Methanolysis D4 +D5 Si CH3Cl ( We have another choice.) Ploymerization The Methanolysisprocess is: DMDCS + CH3OH --> Dn + H(Dn)OH + CH3Cl + H2O PDMS (CH3)2SiCl22CH3Cl + Si/Cu2O

  8. Methanolysis or Hydrolysis • Methanolysis:DMDCS + CH3OH Dn + H(Dn)OH + CH3Cl + H2O • Hydrolysis:DMDCS + H2O Dn + H(Dn)OH +HCl Easy to saparate. Don’t forget that CH3Cl ,the product in Methanolysis process ,which can bethe raw material of Rochow direct synthesis. To transport this strong acid is so expansive. Raw material cost is saved at least 30%

  9. The flow chart becomes… DMDCS Rochow synthesis Methanolysis Cyclization CH3OH D4 +D5 Si CH3Cl Ploymerization The Methanolysisprocess is: DMDCS + CH3OH --> Dn + H(Dn)OH + CH3Cl + H2O The Rochowsynthsis process is : 2CH3Cl + Si/Cu2O → (CH3)2SiCl2 PDMS

  10. Previous Question Cyclone: centrifugal settling Axial velocity Big particles are settled down Axis Wall(r=R)

  11. Future work • Methanolysisprocess design • Cyclization process analysis • Polymerization process analysis • Polymer transportation

  12. References

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