Isopropylation of naphthalene with propene resulted in a variety of isomers having different alkylation levels.The most important isomer is 2,6-DIPN,which is the precursor of important monomer 2,6-naphthalene di- carb...Isopropylation of naphthalene with propene resulted in a variety of isomers having different alkylation levels.The most important isomer is 2,6-DIPN,which is the precursor of important monomer 2,6-naphthalene di- carboxylic acid used for making liquid crystal polymers.In order to increase the yield of 2,6-DIPN,the intermo- lecular transalkylation with naphthalene was applied to the mixture of other DIPNs and PIPN to obtain MIPN en- riched product,which underwent isopropylation with propene to produce 2,6-DIPN in a higher yield.The experi- mental study showed that the preferable conditions for transalkylation were reaction temperature of 325℃,the mo- lar ratio of isopropyl group to naphthyl group(IP/N)of 0.8︰1—0.9︰1,reaction time of 4h and 5%of amorphous silica-alumina by mass.The conversions of DIPN and PIPN in its mixture were 62%—69%and 87%—88%respec- tively and the yield of MIPN was greater than 40%.The mixture of MIPN enriched product and recovered MIPN from rectification was subject to isopropylation with propene at 275℃over a shape-selective catalyst to produce 2,6-DIPN in a yield up to 38%.A recycled process of recovered components was established,through one cycle the yield of 2,6-DIPN based on naphthalene may be 2.8 times higher than before,and the utilization ratio of raw naph- thalene was increased by 46%.展开更多
Heptakis(2.6-di-O-pentyl-3-O-ally)-β-cyclodextrin as an excellent gas chromatographic stationary phase separating phenol and cresol isomers is described.
基金Supported by the Northeast Rejuvenation Strategy Foundation of Anshan City,China(032042).
文摘Isopropylation of naphthalene with propene resulted in a variety of isomers having different alkylation levels.The most important isomer is 2,6-DIPN,which is the precursor of important monomer 2,6-naphthalene di- carboxylic acid used for making liquid crystal polymers.In order to increase the yield of 2,6-DIPN,the intermo- lecular transalkylation with naphthalene was applied to the mixture of other DIPNs and PIPN to obtain MIPN en- riched product,which underwent isopropylation with propene to produce 2,6-DIPN in a higher yield.The experi- mental study showed that the preferable conditions for transalkylation were reaction temperature of 325℃,the mo- lar ratio of isopropyl group to naphthyl group(IP/N)of 0.8︰1—0.9︰1,reaction time of 4h and 5%of amorphous silica-alumina by mass.The conversions of DIPN and PIPN in its mixture were 62%—69%and 87%—88%respec- tively and the yield of MIPN was greater than 40%.The mixture of MIPN enriched product and recovered MIPN from rectification was subject to isopropylation with propene at 275℃over a shape-selective catalyst to produce 2,6-DIPN in a yield up to 38%.A recycled process of recovered components was established,through one cycle the yield of 2,6-DIPN based on naphthalene may be 2.8 times higher than before,and the utilization ratio of raw naph- thalene was increased by 46%.
文摘Heptakis(2.6-di-O-pentyl-3-O-ally)-β-cyclodextrin as an excellent gas chromatographic stationary phase separating phenol and cresol isomers is described.
