How to compare the advantages and disadvantages of two processes in green chemistry

Molecular sieve catalyst molecular sieve is a multifunctional catalyst, which can not only be used as an acidic catalyst, but also has a screening effect on reaction raw materials and products. At present, molecular sieves can also be heteroatom molecular sieves, which can be composed of P, B, Ti and Si or Al, and have been widely used in petrochemical and fine chemical production. Using mordenite as catalyst in the alkylation of naphthalene can not only avoid the environmental pollution caused by the traditional catalyst AlCl3 or phosphoric acid, but also replace the traditional phosphoric acid or AlCl3 to prepare ZSM-5 molecular sieve with isomers of 2,6-and 2,7-dicarboxylnaphthalene from 65,438+0: 65,438+0 to 2.9: 65,438+0. The yield can reach 99%, and the by-product is harmless nitrogen. In the old process, cumene was oxidized into cumene peroxide, and then hydrolyzed into phenol and acetone with acid, which not only had low atom utilization rate, but also produced a lot of wastewater containing phenol and salt. 3. Titanium silicalite molecular sieve catalysts and chemically modified inorganic mesoporous materials have become new research hotspots because of their good thermal stability. For example, in the production of propylene oxide, the traditional process is that the reaction is not only dominated by toxic chlorine, but also accompanied by a large amount of calcium chloride wastewater. Propylene and H2O2 react in one step to produce propylene oxide with titanium silicalite as catalyst. Because the by-product is water, it will not pollute the environment. As a bi-graphite catalyst, graphite has good thermal stability, expansibility, layered structure and allows foreign molecules to be embedded, and has been successfully used as a catalyst for substitution, addition, rearrangement and redox. Adding alkylated 2- diene with graphite as carrier, Diels- Alder reaction is milder and faster than traditional reaction conditions under the action of microwave, with higher yield and stereoselectivity. 3. Aromatic and aliphatic nitro compounds are reduced, hydrazine hydrate is used as reducing agent under the catalysis of graphite, and the corresponding amine is almost quantitatively generated.