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rosin in industrial sewage, which is characterized in that first the anti-dyeing wax on wax-printed figured cloth is withdrawn by caustic soda, and a lot of saponified rosin is left in the sewage; the sewage containing a lot of saponified rosin is collected and stored, and conveyed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.

The present invention relates to a high stability molecular sieve catalyst for preparing propylene by being converted from methanol and a preparation method thereof which mainly solve the problems of poor molecular sieve stability and water thermal stability as well as easy coking and deactivation in the prior art. The present invention adopts the technical proposal of adopting the molecular sieve raw powder with a silicon-aluminum mol ratio SiO2 / Al2O3 of 20 to 40 and a weight percentage of 25 to 99.9 percent as well as at least one caking agent from SiO2, clay and Al2O3 to extrude, tablet or spray ball to shape; then treating for 1 to 8 hours by 0.1 to 3 mol / l of at least one ammonium liquor from ammonium nitrate, ammonium chloride or ammonium sulphate or 0.1 to 8.5 mol / l of at least one acid liquor from muriatic acid, nitric acid, vitriol, phosphoric acid or acetic acid under a temperature of 20 to 90 DEG C; then using 0.1 to 5 percent of at least one liquor selected from lanthanum, cerium nitrate or chloride calculated by weight percentage to treat for 4 to 8 hours under a temperature of 20 to 90 DEG C; then using steam to treat for 2 to 15 hours under the temperature condition of 400 to 700 DEG C; using a liquor of 0.1 to 3mol / l selected from at least one of oxalic acid, citric acid, phosphoric acid and maleic acid under a temperature condition of 20 to 90 DEG C to dip for 2 to 5 hours to obtain the modified molecular sieve catalyst, thus better solving the problems. The present invention can be used in the industrial production of propylene by being converted from methanol.

The present invention relates to a polyformaldehyde dimethyl ether synthesis method, wherein problems of more by-product methylal generation and poor product selectivity during a polyformaldehyde dimethyl ether synthesis process adopting methanol and trioxymethylene as raw materials in the prior art are mainly solved with the present invention. The technical scheme comprises that methylal and trioxymethylene are adopted as raw materials, and the raw materials and a solid super acid catalyst are subjected to a contact reaction at a reaction temperature of 70-200 DEG C under a reaction pressure of 0.5-6 MPa to produce the polyformaldehyde dimethyl ether (CH3O(CH2O)nCH3), wherein the amount of the catalyst is 0.1-5.0% of the weight of the raw materials, and the catalyst comprises, by weight, a) 30-80 parts of a molecular sieve carrier, and b) 20-70 parts of a solid super acid. With the technical scheme, the problems in the prior art are well solved, and the method can be used for industrial production of polyformaldehyde dimethyl ether.

A kind of Fischer-Tropsch synthesis of low molecular linear alkane (nC 5 ‑nC 8 ) isomerization catalyst, preparation method and application thereof, for solving the problems of low activity, poor stability and low conversion rate of the existing Fischer-Tropsch synthesis low molecular linear alkane isomerization catalyst. The present invention adopts the co-precipitation method to prepare Al 2 O 3 ‑ZrO 2 Composite oxide carrier, adding lanthanum salt to increase the proportion of zirconia tetragonal phase, regulating Al 2 O 3 content to keep the catalyst acidity, and then prepare Ni‑WO by the equal volume impregnation method 3 / Al 2 O 3 ‑ZrO 2 catalyst, obtained with Al 2 O 3 ‑ZrO 2 A catalyst for Fischer-Tropsch synthesis of low-molecular linear alkane isomerization with active metal components of Ni, W and La as a carrier. The contents of the three active components are 1-5wt% of Ni, 10-15wt% of W and 0.5-2.5wt% of La. The catalyst has high isomerization activity and selectivity, good repeatability and catalytic stability, and low reaction temperature, and can maintain the isomerization activity of low-molecular linear alkanes at high temperatures.