Patents Examined by Thaun D Dang
  • Process for separating C5 cuts obtained from a petroleum cracking process
    Patent number: 6958426
    Abstract: The present invention relates to a process for separating the isoprene, 1,3-pentadiene and dicyclopentadiene from a C5 cuts, comprising dimerization of the cyclopentadiene and selective catalytic hydrogenation. The second extractive rectification step can be omitted, because the alkynes are removed through selective catalytic hydrogenation prior to the extractive rectification. As a result, the solvent-recovering units can be simplified, and thus the process as a whole can be optimized. Correspondingly, the investment and energy consumption, the operation cost, and finally the production cost can be substantially reduced.
    Type: Grant
    Filed: September 27, 2002
    Date of Patent: October 25, 2005
    Assignees: China Petroleum & Chemical Corporation, Beijing Research Institute of Chemical Industry Sinopec
    Inventors: Baoliang Tian, Puyang Li, Chunpeng Du, Hongfen Xu, Haiqiang Feng, Jingmin Hu, Jidong Gao, Ming Ma
  • Process of producing 2,6-dimethylnaphthalene by dehydrocyclizing 1-(p-tolyl)-2-methylbutane and/or 1-(p-toly)-2-methylbutene using a reduced vanadium catalyst
    Patent number: 6127589
    Abstract: The invention concerns a preparation process for 2,6-dimethylnaphthalene in which 1-(p-tolyl)-2-methylbutane and/or 1-(p-tolyl)-2-methylbutene are dehydrocyclisized using a reduced vanadium catalyst. 2,6-dimethylnaphthalene can be used as starting material when manufacturing polyethylenenaphthalate. The conversion of this method is good and the selectivity of 2,6-dimethylnaphthalene can be improved by reducing the catalyst.
    Type: Grant
    Filed: September 15, 1998
    Date of Patent: October 3, 2000
    Assignee: Optatech Oy
    Inventors: Juha Jakkula, Vesa Niemi, Kari Vahteristo, Kari-Matti Sahala