Abstract:
A method for substantially reducing cyanide and formate concentrations in gasification wastewater streams comprising first removing suspended solids from the wastewater stream, then adding sufficient hydrogen peroxide to completely oxidize contained cyanide ions and formate ions to form a feed solution, and then irradiating the resultant solution with sufficient UV light so as to substantially reduce said contained cyanide ions and formate ions.
Abstract:
PROBLEM TO BE SOLVED: To provide an oil-gasification system which requires no expensive water-treatment device nor additional introduction of water into the system and is adapted to the strict environmental standards, and an oil-gasification process. SOLUTION: A treatment device to be used with the oil-gasification system contains a flash gas condenser part formed to receive a flash gas from the oil-gasification system; a vacuum pump containing a water outlet which is connected to the flash gas condenser part and extracts vapor from the flash gas condenser part and a drying flash gas outlet; a synthetic gas washing part having a wash water inlet, an outlet for used wash water, a cooled synthetic gas inlet and a synthetic gas outlet; and a synthetic gas cooler part formed to receive the used wash water from the synthetic gas washing part and to receive a seal and a flash water from the flash gas condenser part. The oil- gasification system and the oil-gasification process use this.
Abstract:
The invention relates to a process for minimizing evaporator scaling during the recovery of liquids and solids from the aqueous effluent discharged during a partial oxidation gasification from a gasifier (16), wherein the aqueous effluent contains ammonium chloride. The aqueous effluent is evaporated in an evaporator (106) to produce a distillate water line (110) and a line containing brine (112) with a brine concentration of about 10 to 60 weight percent. The brine can be further concentrated and ammonium chloride crystals are recovered. The distillate is recycled to the gasification reaction. No effluent discharges to the environment.
Abstract:
The present invention relates to a method for minimizing hydrogen halide corrosion in quench gasifier during the non-catalytic partial oxidation reaction of a halogen-containing hydrocarbonaceous feed, to produce a hydrogen halide-containing synthesis gas, finely divided particulate solids, and a nontoxic slag. The hydrogen halide-containing synthesis gas is contacted with water in the quench zone (14) of the gasifier (10). The quench water contains a neutralizing agent, in excess of the amount necessary to neutralize hydrogen halide acids present therein, to thereby form halide salts. The quench water containing the halide salts is purified to recover the halide salts. The salt-free water is essentially environmentally non-toxic and can either be recycled to the process or discarded in conformity with environmental regulations.
Abstract:
Fluoride-containing scale can be removed from metal surfaces such as titanium, titanium alloys, nickel alloys, and stainless steel by contacting the metal surfaces with an aqueous salt solution of an inorganic acid, including its hydrates. The cationic portion of the salt can be aluminum, iron and mixtures thereof. The anionic portion of the salt can be a chloride, a nitrate, a sulfate, and mixtures thereof. The contracting occurs in the absence of the addition of an acid, such as hydrochloric, nitric, or sulfuric acid. The presence of the aqueous salt solution with the dissolved fluoride scale does not accelerate or increase the normal rate of metal corrosion that can occur in the absence of the aqueous salt solution or any acidic cleaning agent.
Abstract:
A process for minimizing evaporator scaling during the recovery of liquids and solids from the aqueous effluent discharged during a partial oxidation gasification, wherein the aqueous effluent contains ammonium chloride (NH4Cl). The aqueous effluent is evaporated to produce a distillate water and a brine having an NH4Cl concentration of about 10 to 60 weight percent. The brine can be further concentrated and ammonium chloride crystals are recovered. The distillate water is recycled to the gasification reaction. No effluent discharges to the environment.
Abstract:
A process for minimizing evaporator scaling during the recovery of liquids and solids from the aqueous effluent discharged during a partial oxidation gasification, wherein the aqueous effluent contains ammonium chloride (NH4Cl). The aqueous effluent is evaporated to produce a distillate water and a brine having an NH4Cl concentration of about 10 to 60 weight percent. The brine can be further concentrated and ammonium chloride crystals are recovered. The distillate water is recycled to the gasification reaction. No effluent discharges to the environment.
Abstract:
The present invention relates to a method for minimizing hydrogen halide corrosion in quench gasifier during the non-catalytic partial oxidation reaction of a halogen-containing hydrocarbonaceous feed, to produce a hydrogen halide-containing synthesis gas, finely divided particulate solids, and a nontoxic slag. The hydrogen halide-containing synthesis gas is contacted with water in the quench zone (14) of the gasifier (10). The quench water contains a neutralizing agent, in excess of the amount necessary to neutralize hydrogen halide acids present therein, to thereby form halide salts. The quench water containing the halide salts is purified to recover the halide salts. The saltfree water is essentially environmentally non-toxic and can either be recycled to the process or discarded in conformity with environmental regulations.
Abstract:
ESTA INVENCION SE REFIERE A UN PROCEDIMIENTO PARA MINIMIZAR LA CORROSION PROVOCADA POR EL HALURO DE HIDROGENO EN UN GASIFICADOR DE EXTINCION DURANTE LA REACCION DE OXIDACION PARCIAL NO CATALITICA DE UNA CARGA HIDROCARBONADA QUE CONTIENE UN HALOGENO, PARA OBTENER UN GAS DE SINTESIS QUE CONTIENE HALURO DE HIDROGENO, PARTICULAS SOLIDAS FINAMENTE DIVIDIDAS Y ESCORIAS NO TOXICAS. ESTE GAS DE SINTESIS QUE CONTIENE HALURO DE HIDROGENO SE PONE EN CONTACTO CON AGUA EN LA ZONA DE EXTINCION (14) DEL GASIFICADOR (10). EL AGUA DE EXTINCION CONTIENE UN AGENTE NEUTRALIZADOR, EN CANTIDAD EXCESIVA CON RELACION A LA QUE ES NECESARIA PARA NEUTRALIZAR LOS ACIDOS DE HALURO DE HIDROGENO PRESENTES EN EL GAS, DE MANERA QUE SE OBTENGAN SALES DE HALURO. EL AGUA EXENTA DE SALES NO ES PRACTICAMENTE TOXICA PARA EL MEDIO AMBIENTE Y SE PUEDE RECICLAR MEDIANTE EL PROCEDIMIENTO O DESCARTAR DE ACUERDO CON LA REGLAMENTACION DEL MEDIO AMBIENTE.
Abstract:
Un procedimiento para proporcionar agua de obturación y chorreo a un sistema de gasificación de petróleo que comprende: recibir agua (232) de hollín caliente procedente del dispositivo de extinción de gas de síntesis y del limpiador de hollín (220) en un vaporizador a vacío de agua de hollín (230), recibir agua de hollín fresca del vaporizador (230) a vacío de agua de hollín en un filtro (270) de hollín, recibir agua de filtrado procedente del filtro de hollín en un filtro (280) de cartucho, proporcionar agua de obturación y chorreo al vaporizador (234) de vacío de agua de hollín y el dispositivo de extinción y el limpiador de hollín (224) del filtro de cartucho, proporcionar agua de filtrado a un tanque (290) de almacenamiento de agua y el dispositivo de extinción de gas de síntesis y el limpiador de hollín del filtro de hollín, recibir gas instantáneo procedente del vaporizador de vacío de agua de hollín en un condensador (105) de gas instantáneo, proporcionar agua de condensado instantáneo procedente del condensador de gas instantáneo a una bomba de vacío (110) como agua de obturación, a un enfriador (140) de gas de síntesis como agua de obturación y chorreo, y a un lavador (130) de gas de síntesis como agua de lavado de gas de síntesis.