Hanwha Chemical Corporation

Seung-Hoe Do

Jin Seo Lee

Joo Hee Han

Seong Cheol Hong

A continuous method for functionalizing a carbon nanotube includes preparing a carbon nanotube solution containing a nitro compound represented by chemical formula 1 as R&#x2014;(NOx)y wherein R is an alkyl group of C1 to C7 or an aryl group of C6 to C20 and x and y are integers of 1 to 3 independently, a carbon nanotube and a solvent. An oxidizer for forming a nitric acid selected from the group consisting of the carbon nanotube, oxygen, air, ozone, hydrogen peroxide and a mixture thereof is mixed with the carbon nanotube solution at a front end of a functionalizing reactor and the carbon nanotube mixture is fed into the functionalizing reactor. A functionalized carbon nanotube is prepared by treating the carbon nanotube mixture fed into the functionalizing reactor under a subcritical water or supercritical water condition of 50 to 400 atm.

Continuous method and apparatus for functionalizing carbon nanotube

Provided is a continuous method and apparatus of purifying carbon nanotubes. The continuous method and apparatus of purifying carbon nanotubes is characterized in a first purifying step for injecting a carbon nanotube liquid mixture containing an oxidizer into a purifying reactor under a sub-critical water or supercritical water condition at a pressure of 50 to 400 atm and a temperature of 100 to 600&#xb0; C. to obtain a purified product, thereby removing amorphous carbon and producing the carbon nanotube product.

Apparatus for purifying carbon nanotubes

The present invention relates to a continuous method for functionalizing a carbon nanotube, and more specifically, to a continuous method for functionalizing a carbon nanotube by feeding functional compounds having one or more functional group into a functionalizing reactor into which a carbon nanotube mixture including oxidizer is fed under a pressure of 50 to 400 atm and a temperature of 100 to 600&#xb0; C. to a subcritical water or supercritical water condition of a pressure of 50 to 40 atm by using a continuously functionalizing apparatus to obtain the functionalized products, such that the functional group of the functional compound can be easily introduced to the carbon nanotube, thereby increasing the functionalized effect of the carbon nanotube and increasing the dispersibility accordingly.

Continuous method and apparatus of functionalizing carbon nanotube

Provided is a continuous method and apparatus for purifying carbon nanotubes. Carbon nanotube is fed together with solvent into a preheater via a heat exchanger to produce a carbon nanotube mixture. The carbon nanotube mixture is preheated at 100 to 370&#xb0; C. Then, the carbon nanotube mixture is purified in a purifying reactor under a subcritical water condition of 50 to 400 atm. The resulting purified product is cooled down to 0 to 100&#xb0; C. and depressurized into 1 to 10 atm by feeding the purified product into a cooling down and depressurizing part via the heat exchanger. Finally, the cooled and depressurized product is recovered.

Continuous method for purifying carbon nanotube

The present invention relates to a continuous method and apparatus of functionalizing a carbon nanotube, and more specifically, to a continuous method of functionalizing a carbon nanotube under subcritical water or supercritical water conditions without additional functionalizing processes, comprising: a) continuously feeding the carbon nanotube solution and an oxidizer under a pressure of 50 to 400 atm, respectively or together, and then preheating the mixture of said carbon nanotube solution and said oxidizer; b) functionalizing the carbon nanotube in the preheated said mixture under the subcritical water or the supercritical water condition of 50 to 400 atm; c) cooling down the functionalized product into 0 to 100&#xb0; C. and depressurizing the functionalized product into 1 to 10 atm; and d) recovering the cooled down and depressurized product.

Growing community of inventors

Daejeon, South Korea

Seung-Hoe Do