METHODS OF DESIGNING HARDWARE DECORATION OF PRODUCTIONS OF CARBON NANOTUBES AND BY-PRODUCTS ON THEIR BASIS

Abstract

From the positions of system analysis and the theory of optimal design the approach to the development of hardware design of industrial production of carbon nanotubes and by-ptoducts on the basis of their functionalized forms is proposed. Functionalization is carried out by oxidation of nanotubes with concentrated nitric acid and their subsequent modification by titanium stearate. Functionalized by this method, carbon nanotubes have increased hydrophobic properties and are semi-products for use in composites based on non-polar matrices. Material flows of production of nanotubes and semi-products on their basis are analyzed. Interrelations between them are established. The cost of the product is used as a global economic criterion of optimality. A three-level decomposition of the technological scheme of nanotubes and their functionalized forms production on the principle of "production – stage of production – hardware design stage" is made. At the second level of decomposition, the following stages are identified: catalyst preparation; preparation of carbonaceous raw materials; synthesis of nanotubes; utilization of gaseous pyrolysis products; treatment of material after synthesis; oxidation of nanotubes; modification of oxidized nanotubes with titanium stearate. Economic optimality criteria are determined for them, taking into account the return of by-products from the stages of purification of carbon nanotubes and neutralization of gaseous pyrolysis products at the stage of catalyst production and preparation of the initial carbon-containing raw materials, respectively. The interrelation of information and coordinating signals of the first and second level of the task of designing a new production is established. The correlation of initial design data (qualitative composition of carbon-containing raw materials, production capacity, complex quality index of carbon nanotubes and their morphological characteristics) and the main design and operating parameters of the hardware design of industrial production of carbon nanotubes and semi-products based on them is shown. The task of designing a new production taking into account the combined production of catalyst-free and functionalized carbon nanotubes with the use of the same hardware design is formulated.