34results about How to "Stay acidic" patented technology

The invention discloses a carbon-based solid acid Fenton carrier as well as a preparation method and an application thereof, and belongs to the field of water treatment material. The carbon-based solid acid Fenton carrier takes carbon as the framework and is characterized in that the percentage by weight of (-SO3H), (alpha-Fe2O3) and FeO (OH) is (1-2): (0.55-0.75): (0.75-0.95), wherein the carbon weight is 100. According to the preparation method, a carbon material is prepared firstly, a black sulfonated carbon material solid acid is then obtained and placed in (1.5-2.5) mol / L of Fe (NO)3, vacuum drying is performed after mixing, and a product is taken out for cooling which is repeated until the weight is unchanged; unloaded iron oxide is washed off by distilled water; and rinsing and drying are performed. The material has characteristics of the solid acid, can provide an acid environment required by a Fenton reaction, repeated use requirement can be met, and the acidity of a reaction environment can be maintained. Further, the problem that pH is required to be adjusted repeatedly to meet treatment and discharge requirementsof the Fenton reaction issolved.

The invention provides a way for recovering the saponified rosin in industrial sewage, which is characterized in that first the anti-dyeing wax on wax-printed figured cloth is withdrawn by caustic soda, and a lot of saponified rosin is left in the sewage; the sewage containing a lot of saponified rosin is collected and stored, and conveyed into a neutralizing and separating device; the acid amount necessary for the neutralizing reaction is adjusted by monitoring the pH value of the sewage from wax printing by a pH meter; meanwhile, the sewage and the acid are mixed evenly by a mixer; the sewage from wax printing is heated by a heater, and the suspended rosin particles are separated to the max. extent, then the suspended rosin particles are sent again to a hi-temperature furnace for smelting, the foreign matter and water are removed by filtering; one or a plurality of hi-temperature smeltings can be done, till the rosin is purified and solved and recovered. The invention is of simple process, easy to operate, of good efficiency and low cost. The invention saves natural resource, protects the ecologic environment, and facilitates the emission of waste near to null. The invention greatly improves the utilization of natural resource, is an ideal way and equipment for recovering saponified rosin in industrial sewage.

The invention provides a perfluorinated ion exchange resin and a preparation method thereof. The perfluorinated ion exchange resin has the structure shown in formula (I): the preparation method of the perfluorinated ion exchange resin comprises the grafting reaction of the precursor resin and the functional monomer under certain conditions in whole or in part; Perfluorinated ion exchange resins can meet the requirements of high ion exchange capacity and high mechanical strength at the same time. Fluoride ion exchange resin.

The invention relates to a method for catalytically synthesizing polyformaldehyde dimethyl ether. The method mainly solves the problem of low reaction efficiency of unit catalyst in the process of synthesizing the polyformaldehyde dimethyl ether in the conventional technology. Methanol and trioxymethylene are used as raw materials in the method, and the molar ratio of the methanol to the trioxymethylene is (0.5-10): 1; the raw materials are in contact with a catalyst to produce catalytic reaction so as to prepare the polyformaldehyde dimethyl ether at the reaction temperature of between 70 and 200 DEG C under the reaction pressure of 0.2 to 6MPa; the consumption of the catalyst is 0.1 to 5.0 percent of the weight of the raw materials; and the catalyst comprises the following components in part by weight: a) 30 to 80 parts of molecular sieve carrier, and b) 20 to 70 parts of solid super-strong acid. According to the technical scheme, the problem is well solved, and the method can be used for industrial production of the polyformaldehyde dimethyl ether.