EXamples ( Example 1: The preparation of epoxy ethane from ethylene more i' Example 2: The preparation of epoxy propane more Example 3: The synthesis of methyl acrylate more
Examples Example 1 ：The preparation of epoxyethane from ethylene more Example 2：The preparation of epoxypropane more Example 3：The synthesis of methyl acrylate more
E×ampe1 The preparation of epoxy-ethane
Example 1 The preparation of epoxy-ethane
Traditional way CH2=CH2 CI2+ CICH2 CH2OH+ HCI CICH2 CH2OH Ca(oH)2+ C2H4O+ CaCI2+ 2H2O HCI The overall reaction is: CH2=CH2 CI2 caoH)2 C2H4O+ CaCl2+ H2O Molecular Weight 2871 74 18 The amount of Target Molecule The am。 unt of waste 111+18=129 formed Atom 44 utilization ×100% ×100%=25% 111+18+44 28+71+74
Traditional way CH2=CH2 + Cl2 + H2O ashsska ClCH2CH2OH + HCl ashsska ClCH2CH2OH + Ca(OH)2 + HCl C2H4O + CaCl2 + 2H2O CH2=CH2 + Cl2 + Ca(OH)2 C2H4O + CaCl aska 2 + H2O 28 71 74 ashsska 44 111 18 ashs ska ashsska 44 111+ 18 = 129 44 111+ 18 + 44 = ╳ 100% 44 28+ 71 + 74 = ╳ 100% = 25%
Disadvantages of the traditional method If every step could obtain 100% selectivity and 100% yield, then 61. The atom utilization could reach only 25%, i.e, 1kg of target product /3kg of wastes e 2 The reactant Cl is harmful. it erodes the equipment and injures human beings, thus demanding special equipment and special protection measure. 63. Separation and purification processes are necessary to obtain useful product
Disadvantages of the traditional method 1. The atom utilization could reach only 25%, i.e., 1kg of target product / 3kg of wastes. 2. The reactant Cl2 is harmful, it erodes the equipment and injures human beings, thus demanding special equipment and special protection measure. 3. Separation and purification processes are necessary to obtain useful product. If every step could obtain 100% selectivity and 100% yield, then
New greener way CH2=CH2+1202 Molecular 28 16 44 weight The amount of target product formed 44 The amount of waste produced Atom 44 44 ×100% ×100%=100 utilization 28+16 44 Silver catalyst is used to convert ethylene directly to the target molecule by using oxygen as the oxidant, which gives 100% atom utilization
Silver catalyst is used to convert ethylene directly to the target molecule by using oxygen as the oxidant, which gives 100% atom utilization. New greener way CH2=CH2 + 1/2O2 ashsska 44 C2H4O 28 16 ashsska 44 0 ashsska 44 28+16 = ╳ 100% = ╳ 100% 44 ashsska 44 = 100%