Patent ID: 8460555
Filing Date: 2013-06-11
Classification: C10G

Abstract:
1. A centralized treatment process of an acid containing sump oil is characterized by: Step (1): filter the sump oil by a coarse filter for removing coarse impurities to obtain filtered sump oil; Step (2): input the filtered sump oil to a reaction kettle; compressed air is introduced from a coil at bottom of the reaction kettle with a pore diameter of 60-110 μm and it is stirred after tiny bubbles are produced; at the same time, a sodium carbonate solution with a weight percentage of 7-18% is added to the filtered sump oil till PH value of the filtered sump oil keeps about 6.0-8.0; then an emulsion splitter with a volume ratio of 0.4-0.8% is added to the filtered sump oil in the reaction kettle; then a flocculating agent with a volume ratio of 0.1-0.5% is added in the filtered sump oil in the reaction kettle for further reaction; the compressed air is provided for 2.5-3.5 hours; Step (3): the compressed air is suspended and the filtered sump oil is settled for 4-6 hours; Step (4): provide detergent oil at upper level of the reaction kettle to a purification tank, the detergent oil in the said purification tank is filtered by a fine-mesh filter at a mesh diameter of 1-1000 μm; then it is heated to 110-120° C. and it is dehydrated in a dehydrating tower under common pressure, then the filtered detergent oil is heated to 70-90° C. by a heat exchanger; then it is delivered to the dehydrating tower under a reduced pressure for dehydration under 20-70 kPa to obtain national crude oil; sewage produced after condensation of water vapor dehydrated by the dehydrating tower under normal and reduced pressure and intermediate sewage are delivered to a sewage tank; the sewage in the sewage tank is delivered to a vertical natural oil removal tank to separate the oil and water by way of gravity at a flow speed of 0.5-0.8 mm/s; a water outlet is drained after filtering by a oil-water filter, oil sludge at upper level is retained in the reaction kettle, and oil sludge in the reaction kettle is rinsed with a sodium hydroxide solution at a temperature of 65-75° C. and a weight percentage concentration of 10-20% at a proportion of (1.5-2.5):1 for 15-25 min, and settled for above 2.5 hours; detergent oil after washing with hot water at upper level is delivered to the purification tank and intermediate soda solution is collected in a soda solution tank, and sediment impurities at bottom of the reaction kettle are delivered to a sludge solidifying tank with a sludge pump.