Search

By using amino sulfonic acid salts, formaldehyde, and glyoxal as starting materials, an optimized synthesis process for 2,4,6, 8-tetrachitro-2,4,6, 8-tetraazabicyclic [3.3.0] octane(BCHMX) without purification of the intermediate (2,4, 6,8-tetraazabicyclo[3. 3.0]octane sulfonate) was developed. The molecular structure, crystal structure, and thermal stability of the target product were analyzed and characterized using Fourier transform infrared spectroscopy (FT-IR), proton nuclear magnetic resonance spectroscopy (1H NMR), carbon-13 nuclear magnetic resonance spectroscopy (13C NMR), and thermo-gravimetric analysis combined with differential scanning calorimetry (TC-DSC). Results show that, the optimal process conditions are as follows: 1. 07 mole of potassium amino sulfonate per mole of formaldehyde, 1. 77 mole of glyoxal, 8.4 mole of water as the solvent, and 0. 023 mole of formic acid as the acid catalyst. The condensation reaction is carried out for 12 hours. The nitration reaction is performed using fuming nitric acid and acetic anhydride in a molar ratio of 1. 3 ' 1 as nitrating agent at 40°C . By the condensation and nitration reactions, BCHMX with a purity of 97.8% is obtained with a total yield of 65. 29% . BCHMX belongs to the monoclinic crystal system with space group of P2(1)/c, and the theraml decomposition temperature is 223 °C . [ABSTRACT FROM AUTHOR]

In this paper, the depolymerization of waste polyamide-6,6 by using sodium-1-heptane sulphonate as a catalyst was carried out by acid hydrolysis. This method provides the recycling of polyamide into its monomer derivative which is dibenzoyl derivative of hexamethylene diamine. Depolymerization was carried out at different time from 30 min to 180 min by using 0.03 g of sodium-1-heptane sulphonate at 80°C by taking various amount of catalyst. Reaction takes place around 120 min to get 78.23% yield of the product. The product was analyzed by its melting point (154°C) and FTIR spectra and it was found to be same as the pure one. Kinetics shows pseudo first order with reaction rate constant 6.68 ×10-3 minute-1. [ABSTRACT FROM AUTHOR]