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

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Presentation transcript:

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 Screw conveyor Pneumatic conveyor Easy to control the flow rate The material need to be fluidized Low capacity Particle range 20~5000 μm Transport distance is short Transport distance is long Can be cooling or heating high energy cost Dp of our Silicon particle is 100~6000 mesh =>Dp = 0.55~33.33 μm (1 μm = 180 mesh) Screw conveyor

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=?

PDMS synthesis Target: linear PDMS Origin ,functionality ,and field of application of silicone structural units

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

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

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

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 be the raw material of Rochow direct synthesis. To transport this strong acid is so expansive. raw material Market price chloromethane 3.5RMB/kg methanol 2.5RMB/kg Raw material cost is saved at least 30%

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

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

Future work Methanolysis process design Cyclization process analysis Polymerization process analysis Polymer transportation

References