摘要
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%.
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 dicarboxylic acid used for making liquid crystal polymers. In order to increase the yield of 2,6-DIPN, the intermolecular transalkylation with naphthalene was applied to the mixture of other DIPNs and PIPN to obtain MIPN enriched product, which underwent isopropylation with propene to produce 2,6-DIPN in a higher yield. The experimental study showed that the preferable conditions for transalkylation were reaction temperature of 325℃, the molar 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% respectively 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 naphthalene was increased by 46%.
基金
Supported by the Northeast Rejuvenation Strategy Foundation of Anshan City,China(032042).
关键词
分子烷基交换作用
无定形硅-铝催化剂
2.6二乙丙基荼
甲氧基吲哚催化剂成型技术
intermolecular transalkylation, diisopropylnaphthalene, polyisopropylnaphthalene, monoisopropylnaphthalene, 2, 6-diisopropylnaphthalene, amorphous silica-alumina
