Patent ID: 9687802
Date: 2017-06-27
CPC Classifications: B01D,B01J,B82Y,C01B,D01F

Claim:
1. An apparatus for continuously producing carbon nanotubes comprising: i) a reactor to synthesize carbon nanotubes, comprising a catalyst supply pipe equipped at a first top portion of the reactor to supply a catalyst into the reactor from the first top portion, a reaction gas supply pipe to supply a reaction gas including a carbon source, a reducing gas, and an inert gas into a bottom portion of the reactor, and a product discharge pipe at a second top portion of the reactor to discharge the produced carbon nanotubes and a mixed gas, and which is capable of extending a residence time in the reactor by increasing a contact time in the reactor by supplying the catalyst into the reactor from the first top portion together with the reaction gas into the reactor from the bottom portion of the reactor; ii) a separator to separate a mixed gas from the carbon nanotubes transferred from the reactor; iii) a hydrogen pressure swing adsorption (PSA) unit including two or more adsorption towers and two or more flow direction control valves that is configured to process removal of 19 to 34% of only hydrogen (H iv) a filter, a scrubber or a combination thereof arranged between (ii) the separator and (iii) the PSA unit; and v) a recirculation pipe to recirculate the processed gas including non-reacted carbon source, the inert gas and the reducing gas injected at the start of the reaction discharged from the PSA unit to the reactor for carbon nanotubes, wherein the reactor is a fluidized bed reactor, wherein the PSA unit includes a first flow direction control valve to direct the mixed gas discharged from the separator to a first adsorption tower to perform pressurization, a second flow direction control valve to direct the processed gas to the recirculation pipe and a third flow direction control valve to direct the hydrogen (H wherein, in the PSA unit, the first to third flow direction control valves are connected.