Abstract:
DECOKED ALKALINE SULFITE PULP LIQUOR HAVING AN EXCESS OF SOLUBLE SULFITE IS REGENERATED BY TREATING WITH AN ALKALINE EARTH OXIDE AND/OR HYDROXIDE TO PRECIPITATE EXCESS SOLUBLE SULFITE ION AS INSOLUBLE ALKALINE EARTH SULFITE. THE SULFITE PRECIPITATE IS REMOVED BY FILTRATION AND THE RESULTING LIQUOR IS RECYCLED TO THE PULPING OPERATION. THE ALKALINE EARTH OXIDE AND SO2 ARE RECOVERED FROM THE FILTER CAKE BY HEATING.
Abstract:
OIL REFINING IS EFFECTED BY HEATING UNDER AGITATED FLOW CONDITIONS CRUDE OIL OR RESIDUAL OIL WITH WATER AT A TEMPERATURE SUFFICIENT TO FORM A FOAM WHICH IS COOLED BELOW THE VAPORIZATION TEMPERATURE OF WATER TO FORM A STABLE EMULSION CONTAINING SULFUR, CARBON RESIDUES, ASPHALTENES, NICKEL AND VANADIUM. AFTER REMOVAL OF THE EMULSION, THE OIL CAN BE A FUEL OR A CATALYTIC PROCESSES.
Abstract:
A process for treating a waste feed stream containing essentially water-soluble organic wastes, in particular those originating in refinery reservoirs, refinery waste streams, refinery pits, and lube oil additive plants, is described as involving heating the stream under turbulent flow conditions to temperatures of 400* to 700*F and pressures of 300 to 3,100 psi in the presence of air or of oxygen thereby splitting off carbon dioxide. The oxidized waste stream, which has a considerably reduced chemical oxygen demand, is continuously fed to a hot contacting zone and is in heat-exchange relationship with the incoming effluent stream.
Abstract:
Formation of mineral type scale in pressure coking equipment used in coking waste materials in the liquid phase is eliminated by effecting the coking of such materials using direct countercurrent heat exchange with a hot hydrocarbon stream which is kept continuously circulating along the walls of the equipment.
Abstract:
Spent Sulfite liquor from a sulfite mill digester is preheated and then heated in a closed system at a temperature in the range of 450* to 700*F under autogenous pressure for a period of 0.5 minutes to six hours to form an effluent liquid and a sulfurcontaining coke. The coke is burned to furnish steam for the process and flue gas from which the SO2 evolved is absorbed by the effluent liquid thus forming additional cooking liquor which is recycled to the digester. Volatile gases from the digester are also oxidized to SO2 which is combined with that formed by burning the coke.
Abstract:
CONTAINING COKE RESULTING FROM COKING THE ACID SPENT KRAFT LIQUOR.
DISCLOSED IS AN IMPROVED AND INTEGRATED KRAFT PULPING PROCESS WHEREIN THE WOOD CHIPS ARE PRETREATED IN AN ALKALINE "BUFFER" MEDIUM CONTAINING H2S AT A PARTIAL PRESSURE OF ABOUT 90 TO 110 P.S.I.G. AT ABOUT 260* F. THE HYDROGEN SULFIDE IS PRODUCED BY COKING IN THE LIQUID PHASE A SPENT KRAFT PULPING LIQUOR THAT HAS BEEN MADE ACID WITH ABSORBED, SO2. THIS SO2 IS GENERATED BY BURNING SULFUR-
Abstract:
A LIQUID HYDROCARBON FUEL IS REACTED WITH HYDROGEN AND H2O OVER A NICKEL OXIDE-CHROMIUM OXIDE CATALYST AT HIGH PRESSURE TO PRODUCE A METHANE-RICH FUEL GAS. PREFERABLY, HYDROGEN IN THE PRODUCT GAS IS RECOVERED AND TOTALLY RECYCLED TO THE REACTION ZONE. OPTIONALLY, CO2 MAY BE REMOVED FROM THE PRODUCT GAS PRODUCING SUBSTANTIALLY PURE METHANE.
Abstract:
Method of separating from hard water dissolved mineral hardness constituents whose solubility varies inversely with temperature, in which the water temperature is raised by direct, preferably cocurrent contact with a preheated stream of liquid hydrocarbon oil, to a temperature sufficient to precipitate hardness constituents but below the temperature at which the hot oil will extract water, and at a pressure sufficient to maintain the oil and water in liquid phase.
Abstract:
Oil-water emulsion-type sludges, in particular refinery pit sludges are thermally treated at a temperature of at least 750* F under pressure of at least 3,000 psi to give a gas phase containing saturated hydrocarbons, suitable as fuel or cracking stock, a usable oil fraction, a water phase and a useful siltcoke phase.
Abstract:
The liquid phase coking of waste alkaline sulfite pulp liquors can be effected at a faster rate and a lower temperatures by lowering the pH of such liquors by at least one pH unit. Also desirably, both the coke yield is increased and the Chemical Oxygen Demand of the resulting effluent is lowered. The pH lowering is achieved by adding sulfur dioxide to the waste liquor either as free SO2 or a water solution of SO2. The effluent and the chemicals recovered after coking can be recycled in the paper pulp process from which they were recovered.