摘要:
A process for the simultaneous hydroconversion of a first feedstock comprising unsaturated, halogenated organic compounds and a second feedstock comprising saturated, halogenated organic compounds which process comprises: (a) contacting the first feedstock comprising unsaturated, halogenated organic compounds with hydrogen in a first hydrogenation reaction zone operated at hydrogenation conditions selected to minimize the polymerization of unsaturated organic compounds and to produce a first hydrogenated hydrocarbonaceous stream; (b) contacting at least a portion of the first hydrogenated hydrocarbonaceous stream and the second feedstock comprising saturated, halogenated organic compounds with hydrogen in a second hydrogenation reaction zone operated at hydrogenation conditions selected to produce a second hydrogenated hydrocarbonaceous stream and to generate at least one water-soluble hydrogen halide compound; (c) contacting the resulting effluent from the second hydrogenation zone containing hydrogenated hydrocarbonaceous compounds, a hydrogen-rich gas and at least one water-soluble hydrogen halide compound with a halide-lean absorber solution in an absorption zone; (d) withdrawing a halide-rich absorber solution containing at least a portion of the water-soluble hydrogen halide compound from the absorption zone; (e) withdrawing a stream comprising hydrogenated hydrocarbonaceous compounds and a hydrogen-rich gas from the absorption zone; and (f) introducing the stream recovered in step (e) into a separation zone to provide a hydrogen-rich gaseous stream and a third hydrogenated hydrocarbonaceous stream.
摘要:
A process for treating a hydrocarbonaceous stream containing a non-distillable component to produce a hydrogenated distillable hydrocarbonaceous product while minimizing thermal degradation of the hydrocarbonaceous stream which process comprises the steps of: (a) contacting the hydrocarbonaceous stream with a hot first hydrogen-rich gaseous stream having a temperture greater than the hydrocarbonaceous stream in a flash zone at flash conditions thereby increasing the temperature of the hydrocarbonaceous stream without indirect heat exchange and vaporizing at least a portion thereof to provide a hydrocarbonaceous vapor stream comprising hydrogen and a heavy stream comprising the non-distillable component; (b) contacting the hydrocarbonaceous vapor stream comprising hydrogen with a hydrogenation catalyst in a hydrogenation reaction zone at hydrogenation conditions to increase the hydrogen content of the hydrocarbonaceous compounds contained in the hydrocarbonaceous vapor stream; (c) condensing at least a portion of the resulting effluent from the hydrogenation reaction zone to provide a second hydrogen-rich gaseous stream and a liquid stream comprising hydrogenated distillable hydrocarbonaceous compounds; (d) recovering a hydrogenated distillable hydrocarbonaceous product from the liquid stream comprising hydrogenated distillable hydrocarbonaceous compounds; and (e) reacting at least a portion of the heavy stream comprising the non-distillable component recovered from step (a) in a thermal coking zone at thermal coking conditions to provide a thermal coking zone effluent.
摘要:
A process for the simultaneous hydroconversion of a first feedstock comprising unsaturated, halogenated organic compounds and a second feedstock comprising saturated, halogenated organic compounds which process comprises: (a) contacting the first feedstock comprising unsaturated, halogenated organic compounds with a first dried hydrogen-rich gas stream in a first hydrogenation reaction zone operated at hydrogenation conditions selected to minimize the polymerization of unsaturated organic compounds and to produce a first hydrogenated stream comprising hydrocarbonaceous compounds; (b) reacting at least a portion of the first hydrogenated stream comprising hydrocarbonaceous compounds and the second feedstock comprising saturated, halogenated organic compounds with hydrogen in a second hydrogenation reaction zone operated at hydrogenation conditions selected to produce a second hydrogenated stream comprising hydrocarbonaceous compounds and to generate at least one water-soluble hydrogen halide compound; (c) contacting the the second hydrogenated stream with a halide-lean absorber solution in an absorption zone; (d) withdrawing a halide-rich absorber solution containing at least a portion of the water-soluble hydrogen halide compound from the absorption zone; (e) withdrawing a stream comprising hydrogenated hydrocarbonaceous compounds and a hydrogen-rich gas from the absorption zone; (f) introducing the stream recovered in step (e) into a separation zone to produce a hydrogen-rich gas stream comprising water vapor and a third hydrogenated stream comprising hydrocarbonaceous compounds; (g) removing at least a portion of the water vapor from the hydrogen-rich gas stream comprising water vapor in a drying zone to produce a second dried hydrogen-rich gas stream; and (h) recycling at least a portion of the second dried hydrogen-rich gas stream to step (a) as the first dried hydrogen-rich gas stream.
摘要:
An immobilized reagent for the decontamination of fluids is described, consisting of a solid, carrier on which there are absorbed (a) polyethylene glycols, (b) alkali or alkaline-earth metal alcoholates.
摘要:
The invention provides a two-step process where polychlorinated biphenyls CBs), i.e. biphenyl having 2 to 10 chlorine atoms, are first reduced to unsubstituted biphenyl, then oxidized to a biodegradable dicarboxylic acid having the formula: (CH.sub.2).sub.n (CO.sub.2 H).sub.2, where n=0 to 10 possible --CH.sub.2 --units for application in aqueous systems including water, mud and wet soil.
摘要:
Under certain operating conditions, an emulsion of an acidified unfiltrable tarry bottoms stream from a reactor for the chlorination of ethylene to 1,2-dichloroethane can be demulsified and separated in a phase separation tank. The presence of FeCl.sub.3 in an amount more than 5 ppm Fe in the separated organic waste, fouls the reboiler and lower internals of a "heavies" column in which the separated organic waste is concentrated, and deactivates the catalyst in a Catoxid fluid bed reactor in which the concentrate is burned. By maintaining an iron salt chlorination catalyst in a concentration which results in 2000 ppm to 4000 ppm of Fe in the HTC reactor bottoms, and operating the HTC reactor at a temperature in the range from about 90.degree. C. to 120.degree. C. and a pressure in the range from 9 psig to 12 psig, an unfiltrable reactor bottoms drawoff is produced which may be acidified without forming an emulsion. Formation of an emulsion is avoided by mixing each volume of the HTC bottoms drawoff with at least 50 volumes of dilute aqueous HCl in a concentration range from 2 to 4% so as to demulsify the emulsion into aqueous acid and organic phases. The mixture is gravity-separated in a phase separation tank by decantation. The lower layer (60-70% by wt EDC, the remainder being heavies) is concentrated by recovering EDC overhead and producing a bottoms concentrate in which the Fe is present in no more than 50 ppm. The concentrate may be economically disposed of in a Catoxid reactor using a support-free gamma alumina catalyst found to be highly sensitive to iron.
摘要:
A mobile apparatus for chemically decontaminating PCB-contaminated dielectric fluids utilizes three reactors through which the contaminated fluid is processed on a repetitive, sequential batch basis automated by a programmable controller. The processing of each reactor batch includes a charging cycle during which a reactor is filled with contaminated fluid, a reaction cycle during which the PCBs are destroyed by reaction with reagents introduced into a reactor, and a discharging cycle during which the reactor is emptied of decontaminated fluid and reaction by-products into a decanting tank for ultimate separation. The controller coordinates the sequential batch processing through the three reactors in 120.degree. time phased relation such that a charging cycle of one reactor batch, a reaction cycle of a second reactor batch and a discharging cycle of the third reactor batch are all coincident in time during normal operation.
摘要:
A process and apparatus for treating any fluidizable solid material having a dioxin contaminant absorbed or adsorbed thereon. The method and apparatus includes heating the fluidizable solids, using hot turbulent gas at a temperature in the range of 850.degree. to 2,500.degree. F. to vaporize and thereby separate the dioxin from the fluidizable solids and to fluidize at least a portion of the solids. The dioxin are then further treated to dispose of the dioxins, such as by condensing the liquid and filtering or decanting them from the condensed water.
摘要:
Method for the total dehydrohalogenation of halogenated compounds. The method includes providing a reaction mixture by dissolving an alkali metal hydroxide in a molar excess of an ethylene glycol to form an alkali metal glycolate and reacting the halogenated organic compound with the alkali metal glycolate. In halogenated compounds having one carbon, carbon dioxide is the reaction product. In those having more than one carbon, acetylene is formed. The preferred ethylene glycol is tetraethylene glycol and the preferred alkali metal is potassium hydroxide. The method is particularly useful for disposing of toxic halogenated compounds which make up soil contaminants, like ethylene dibromide.
摘要:
A method is provided for reducing the level of polychlorinated aromatic hydrocarbons dissolved in organic solvents at a faster rate wherein the organic solvent is treated with a glycol, such as polyethylene glycol, and an alkali metal hydroxide in the form of a uniform solids slurry.