37results about How to "Easy desorption and regeneration" patented technology

The invention discloses a method for adsorbing and separating a sulfur-containing acid gas. The method comprises the following step: by taking an anion-containing metal-organic frame material as an adsorbent, selectively adsorbing the sulfur-containing acid gas in a gas mixture so as to obtain a purified gas, wherein the sulfur-containing acid gas comprises one or more of sulfur dioxide, sulfur trioxide and hydrogen sulfide. The anion-containing metal-organic frame material used in the method has a great number of regularly arranged inorganic anion functional groups with negative electricity, the size of the aperture of an MOF material can be adjusted in a controllable manner by adjusting the size of organic ligand, or a three-dimensional channel spatial structure can be adjusted through an interpenetration structure. The inorganic anions with negative electricity can form an electrostatic environment in a limited space of the MOF material, sulfur-containing acid gas molecules can be selectively adsorbed by virtue of an electrostatic effect of the electrostatic environment and lacked electron atoms of the acid gas, and thus high-capacity high-selectivity separation of the sulfur-containing acid gas can be achieved.

The invention discloses a method for reducing and removing metal impurities from ammonium molybdate solution by using ion exchange resin, relating to the deep purification technology of the ammonium molybdate solution in chemical industry field. The method comprises the following steps: firstly selecting three suitable cationic exchange resins according to the kinds and contents of the impurities metal ions in a molybdenic acid solution; adopting ammonium water to implement transamination treatment for the resins, and putting the resins in the ion exchange columns which are serially connected according to a certain order; regulating the to-be-treated ammonium molybdate solution to be weakly acidic with nitric acid, and leading the treated ammonium molybdate solution through serially connected ion exchange columns in turnat a certain speed for implementing ion exchange treatment; and adopting the ammonium water to adjust the ammonium molybdate exchange processing liquid subjected to columns treatment to alkalescence after the exchange treatment is finished. The method can uniformly reduce the concentration of the impurities metal ions in the ammonium molybdate solution to be lower than 3 ppm, and the metal ions comprise calcium, magnesium, aluminum, zinc, ferrum, nickel, copper, cadmium, chromium, manganese, bismuth and plumbum; and the method cannot change the components and the concentration of the ammonium molybdate solution. The ion exchange resins can be reused, so that the operation cost can be efficiency reduced, and the continuous impurity removing production in large-scale can be realized.

The utility model relates to a refining method of by-product HCl gas in organic chlorine production process, the by-product HCl gas passes by the absorption post filled with absorption resin at flow speed of 0.1-0.5m / s under constant-temperature constant-pressure, the removal ratio of the organic in the HCl gas can reach 99.8 percent, afterwards the absorption resin that absorbs the organic is desorbed by 110-160 DEG C saturation vapor, the desorption ratio can exceed more than 99 percent, the desorption liquid is condensed, oil-gas separated, recycled to obtain the organic mixture containingbenzene or chlorobezene, the mixture is furthermore distilled and separated to obtain the benzene or chlorobezene, finally the absorption resin after desorbed by the vapor is dried by 110-140 DEG C hot air, and then cooled to room temperature for next stage absorption. The absorption resin can be reused after desorption and regeneration.

The invention discloses a treatment method of waste water in hydroxybenzoic acid production, which is characterized by comprising the following steps of: (1) conducting pretreatments of acidation, precipitation and filtering on waste water; (2) conducting adsorption treatment on the filtrate obtained in the step (1) at the temperature of 5-40 DEG C and at the flow of 0.5-2 column volume per hour through an adsorption column filled with modified macroporous absorbent resin; and (3) conducting biochemical treatment on the adsorption effluent obtained after step (2). The p-hydroxybenzoic acid recycled by the method and the intermediate thereof can be reused as raw materials in the original production technique, and waste water treatment and recycling of waste are realized simultaneously. Themethod has good waste water treatment effect, is easy for desorption and regeneration, reduces the use amount of the modified macroporous resin, and is easy for industrialized implementation.