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Develop a block diagram showing all of the constituent process reactions ( one reaction or process per block ) required to produce common PET polyester
Develop a block diagram showing all of the constituent process reactions one reaction or process per block required to produce common PET polyester polyethyleneterephthalate via the DMT Route starting from fundamental raw materials such as natural gas methane CH natural gas condensate ethane CH crude oil naphtha assume normal octane, CH air N and O and water HO Write balanced chemical equations for every reaction. Considering the overall supply chain and its component balances, comment on recycle possibilities among these constituent processes within the supply chain.
Intermediates you should consider include:
Ethylene, CH
Ethylene Oxide EO CHO member ring
Ethylene Glycol EG HOCHOH
Xylene mixed CHCHthree isomers
Paraxylene dimethylbenzene, pX CHCHCH
Terephthalic Acid benzenedicarboxylic acid, TPA HOOCCHCOOH
Carbon Dioxide, CO
Carbon Monoxide, CO
Hydrogen, H
Methanol MeOH CHOH
Dimethylterephthalate DMT CHOOCCHCOOCH
Bishydroxyethylterephthalate PET "monomer", BHET HOCHOOCCHCOOCHOH
Polyethyleneterephthalate PETCHOOCCHCOOn
Some chemistries:
Ethylene is made by steam cracking of ethane the steam keeps the system from coking
Ethylene oxide is made by the air oxidation of ethylene
Ethylene glycol is made by ethylene oxide hydration
Xylene is made by the catalytic reforming of octane
Terephthalic acid is made by the air oxidation of paraxylene isomer
Carbon dioxide is made by the combustion of methane
Syngas hydrogen carbon monoxide mixture is made by the steam reforming of methane
Excess hydrogen in syngas can be reacted with carbon dioxide to produce carbon monoxide water gas shift reaction
Methanol is made from an exactly :hydrogen : carbon monoxide ratio syngas
Dimethylterephthalate is made by the esterification of terephthalic acid with methanol
Bishydroxyethylterephthalate is made by the transesterification of DMT with EG
Polyethyleneterephthalate is made by the polycondensation of BHET splitting out EG
An appropriate basis for the overall supply chain component balances might be the final polymer repeat unit CHOOCHCOO
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