Abstract: The present invention relates to a method for manufacturing carbonaceous nanofibers. The method comprises the following steps: (a) a liquid feed, a carrier gas and a de-coke agent are added into a reactor thereby to form a mixture, wherein the liquid feed includes a hydrocarbon, a catalyst precursor and a sulfide, and the carrier gas includes hydrogen; and (b) the mixture is heated at a temperature ranging from 700 to 1600° C. In this method, the hydrocarbon is used as a carbon source for the carbon material, which forms the carbonaceous nanofibers, a transition metal compound is used as a catalyst precursor, a sulfide is used as an auxiliary catalyst, and water or alcohol is used as a de-coke agent.

Abstract: The present invention provides a method for preparing polypropylene terephthalate/polyethylene terephthalate (PPT/PET) copolyester, which comprises a group of processes from (a) to (e). Process (a) comprises subjecting bis-2-hydroxyethyl terephthalate (BHET), pure terephthalic acid (PTA) and 1,3-propanediol (1,3-PDO) to undergo esterification reaction to produce BHET and bis-2-hydroxypropyl terephthalate (BHPT), and then subjecting BHET and BHPT to undergo copolymerization reaction. Process (b) comprises subjecting PTA and 1,3-PDO to undergo esterification reaction to produce BHPT, adding BHET, and then subjecting BHET and BHPT to undergo copolymerization reaction. Process (c) comprises subjecting BHET and BEPT to undergo copolymerization reaction. Process (d) comprises subjecting PTA, ethylene glycol (EG) and 1,3-PDO to undergo esterification reaction to produce BHET and BHPT, and then subjecting BHET and BHPT to undergo copolymerization reaction.

Abstract: The present invention provides a polyester fiber of easy dyeability. The propylene chain of polypropylene terephthalte (PPT) of easy dyeability is incorporated into the main chain of polyethylene terephthalate (PET), and a PPT/PET copolyester having both ethylene and propylene groups can thus be formed. The PPT/PET copolyester is then spun into a copolyester fiber. The copolyester fiber of the present invention can be successfully dyed with a disperse dye at a temperature below 100° C. in the absence of a dye carrier.