| 摘要 |
FIELD: process engineering. ^ SUBSTANCE: invention relates to processing waste gases in production of aromatic dicarboxylic acid by liquid phase oxidation of aromatic dialkyl hydrocarbon, an initial substance, using acetic acid as a solvent, in the presence of metallic catalyst containing, as a promoter, cobalt, manganese and bromine at reactor temperature of 185 to 205C and using oxygen-containing gas, that comprises the following stages: oxidation reaction waste gas is cooled down and separated. After condensation, waste gas condensing components are separated at high pressure. Obtained waste gas is subjected to wet cleaning at 40C or lower temperature in high-pressure absorption columns by rinsing fluid into two stages to reduce concentration of components contained therein. Said waste gas at 12.0-16.0 kg/cm2(surplus) is forced through two-stage pressure turbines after heating of said gas fed to turbine first and second stage by steam at pressure of approx. 5 kg/cm2 (surplus) to 140C - 150C. Note here that two-stage turbines are used with second stage-to-first stage power ratio varying from 1 to 1.4 to obtain heat- and waste-gas-generated power in compliance with the formula below: (T2/T1)=(P2/P1)(-1), where = Cp/Cv = 1.4, T1, P1 are temperature and pressure at inlet side, T2, P2 are those at outlet side, is relation between specific heat capacity at constant pressure Cp to specific heat capacity at constant volume Cv. ^ EFFECT: efficient process and system. ^ 6 cl, 9 tbl, 3 dwg |
