Presentation on theme: "化工四 B95504048 彭子軒 B95504050 劉邦彥 B95504052 林文翔. Solid transport to reactor in Rochow synthesis process Screw conveyorPneumatic conveyor Easy to control."— Presentation transcript:
Solid transport to reactor in Rochow synthesis process Screw conveyorPneumatic conveyor Easy to control the flow rateThe material need to be fluidized Low capacityParticle range 20~5000 μm Transport distance is shortTransport distance is long Can be cooling or heatinghigh 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 Trying to estimate the packed height and the reactor volume are both our goals. Mass flow rate=? Bed hight=?
PDMS synthesis Target: linear PDMS Origin,functionality,and field of application of silicone structural units
Previous step Hydrolysis: BUT… Cyclic D4~7 linear Dn (n=4~100,molarcular weight distribution is very wide.) This is a BAD news!!!
The monomer synthesis and polymerization process D4 and D5 are major industrial products,which are either marketed as such or used for the production of PDMS D4 and D5 are main products 1. Cyclization process: 2. Ring-opening polymerization process:
Flow chart Rochow synthesis Hydrolysis Methanolysis Cyclization Ploymerization PDMS ( We have another choice.) D4 +D5 DMDCS The Methanolysis process is: DMDCS + CH3OH --> Dn + H(Dn)OH + CH3Cl + H2O (CH 3 ) 2 SiCl 2 2CH 3 Cl + Si/Cu 2 O SiCH3Cl
Methanolysis or Hydrolysis Methanolysis: DMDCS + CH3OH Dn + H(Dn)OH + CH3Cl + H2O Hydrolysis: DMDCS + H2O Dn + H(Dn)OH +HCl To transport this strong acid is so expansive. Don’t forget that CH3Cl,the product in Methanolysis process,which can be the raw material of Rochow direct synthesis. raw materialMarket price chloromethane3.5RMB/kg methanol2.5RMB/kg Easy to saparate. Raw material cost is saved at least 30%
The flow chart becomes… Rochow synthesis MethanolysisCyclization Ploymerization PDMS D4 +D5 DMDCS The Methanolysis process is: DMDCS + CH3OH --> Dn + H(Dn)OH + CH3Cl + H2O The Rochow synthsis process is : 2CH 3 Cl + Si/Cu 2 O → (CH 3 ) 2 SiCl 2 CH3Cl Si CH3OH
Previous Question Cyclone: centrifugal settling Axial velocity Wall(r=R) Axis Big particles are settled down
Future work Methanolysis process design Cyclization process analysis Polymerization process analysis Polymer transportation