Pyrolysis Kinetics and Residue Characteristics of Petrochemical Industrial Sludge

Abstract

This study investigated the pyrolysis characteristics of sludge from wastewater treatment plants in the petrochemical industry and focused on the pyrolysis kinetics, elemental composition of residue, and volatile organic compounds (VOCs) of exhaust gas. As pyrolysis temperature increased to 773 K, the increasing rate of crude oil production tended to a stable condition. The result indicated that the optimal temperature of crude oil and water mixed production was 773 K. When pyrolysis temperature increased from 673 to 973 K, carbon, oxygen, nitrogen, and hydrogen concentrations of residue decreased and the sulfur concentration of residue increased. The concentrations of benzene, toluene, ethylbenzene, and styrene increased by the increasing pyrolysis temperature. We found that the reaction order of sludge pyrolysis was 2.5 and the activation energy of the reaction was 11.06 kJ/mol. We believe that our pyrolysis system is transitional between devolatilization and combustion.

Application and development of pyrolysis technology in petroleum oily sludge treatment

“…In the early study, it was found that nitrogen and hydrogen were easily desorbed at pyrolysis temperatures between 473-773°C, while the sulfur in char was only slightly desorbed. At the same time, higher pyrolysis temperature leads to an increase of benzene, toluene, ethylbenzene and xylene content in syngas [57].…”

Near-Critical and Supercritical Fluid Extraction of Industrial Sewage Sludge

“…Many studies are available on the thermal conversion of sewage sludge and other biomasses into fuel products through the use of pyrolysis, [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] thermochemical liquefaction, 19,20 and gasification. [21][22][23][24][25][26][27][28][29][30] Konar et al have developed a technology for the catalytic pyrolysis of sewage sludge lipids over activated alumina to produce fuel which could be used as diesel fuel.…”

“…13 Kinetic studies on pyrolysis of petrochemical industrial sludge were investigated to provide useful knowledge for the design, operation, and pyrolysis treatment of oil sludge. [14][15][16][17] Liquefaction of dewatered sewage sludge (150-350 °C) was examined to reduce nitrogen that needed to be removed from oil before use. 18 Direct thermochemical liquefaction of sewage sludge for production of liquid fuels (heavy oil) and as a means of pollution control was studied by catalytic conversion using sodium carbonate at 250-340 °C.…”

“…Many studies are available on the thermal conversion of sewage sludge and other biomasses into fuel products through the use of pyrolysis, − thermochemical liquefaction, , and gasification. − …”

Adsorption Characteristics of Benzene on Biosolid Adsorbent and Commercial Activated Carbons

“…The detailed pyrolytic equipment diagram was shown in previous work. 7 Two liters per minute highpurity nitrogen (99.995%) flowed through the tube as the sample bed purge gas. The quartz tube was heated to the desired temperature at the rate of 15°C/min.…”