10 results about "Ammonium hexafluorosilicate" patented technology

A method for synthesizing a mesoporous nano-sized ultra-stable Y zeolite includes adding sodium aluminate and colloidal silica to an aqueous NaOH solution and mixing to form a hydrogel having the following molar ratio composition: Na2O: Al2O3: SiO2: 200 to 400 H2O in the range of 8 to 12. The method further includes heating the hydrogel to an autoclave to form a zeolite precursor, filtering and washing the zeolite precursor to form a nano-sized Y zeolite. The method further includes combining the nano-sized Y zeolite with water to form a nano-sized Y zeolite slurry mixture, and then adding 0.1 M to 2.0 M of an aqueous ammonium hexafluorosilicate solution to form a dealumination solution. Finally, the method includes filtering and washing the dealuminated solution with water to form an ultra-stable Y zeolite precursor, drying the ultra-stable Y zeolite precursor, and calcining the dried zeolite precursor to form a nano-sized ultra-stable Y zeolite.

The application belongs to the technical field of biomass catalytic conversion, and specifically discloses a gallium-modified dealuminized H-ZSM-5 catalyst, a preparation method and application thereof, and the method comprises the following steps: ion exchange is performed on Na-ZSM-5 molecular sieve and an ammonium salt solution; selective dealuminization is performed on NH4-ZSM-5 molecular sieve and an ammonium hexafluorosilicate solution; and the impregnation method is used to load a gallium salt solution to the dealuminized molecular sieve carrier DeAl-H-ZSM-5, so as to obtain the gallium-modified dealuminized H-ZSM-5 catalyst. The application adopts the above-mentioned gallium-modified dealuminized H-ZSM-5 catalyst, the preparation method and application thereof, and the method is characterized in that the composite strategy of purifying the base by selectively dealuminizing first and then precisely loading Ga to regulate the acidity is adopted, the prepared catalyst can efficiently catalyze the preparation of furfural from pentose in a γ-valerolactone / water system, and high conversion rate and high selectivity are realized.

The invention discloses a silicon tetrafluoride resource utilization method, and relates to the field of silicon tetrafluoride resource utilization. The method comprises the following steps: S1, introducing silicon tetrafluoride into an ammonium bifluoride solution, and filtering to obtain ammonium fluosilicate precipitate and first filtrate; s2, adding a desilicication precipitator into the first filtrate, and filtering to obtain fluosilicate precipitate and second filtrate; s3, mixing the second filtrate with concentrated sulfuric acid, heating, evaporating and analyzing, absorbing the obtained gas with water to obtain hydrofluoric acid, and crystallizing and separating out the residual liquid to obtain ammonium salt. The whole process route is mild in reaction condition and high in safety coefficient; high temperature and external electric field are not needed, and energy consumption is low; no secondary waste is generated, and the comprehensive utilization degree of resources is high.

The invention discloses a high-flux anti-pollution composite reverse osmosis membrane and a preparation method thereof, and relates to the technical field of water treatment membranes. The composite material comprises a porous support layer, an in-situ mineralized polyamide separation layer and a metal-polyphenol gradient functional layer. The in-situ mineralized polyamide separation layer is formed by carrying out interfacial polymerization reaction on a m-phenylenediamine aqueous phase solution and a trimesoyl chloride organic phase solution containing ammonium hexafluorosilicate, and fluosilicate nano-clusters are generated through in-situ hydrolysis; the metal-polyphenol gradient functional layer is formed by sequentially assembling and competitively coordinating a zirconium source solution and polyphenol solutions with different sodium citrate concentrations. According to the invention, the internal nano-clusters construct a water molecule transmission channel, the balance of anti-pollution performance and water mass transfer resistance is realized through the surface gradient functional layer, the obtained composite membrane has high flux and excellent anti-pollution performance, the preparation method is simple and controllable, and the composite membrane has a good industrial application prospect.

A method of making a mesoporous zeolite may include combining an initial zeolite with cetyltrimethylammonium bromide to form an initial zeolite mixture. The method may also include adding ammonium hexafluorosilicate and ammonium hydroxide to the initial zeolite mixture to form a treated zeolite mixture. The method may also include heating the treated zeolite mixture to form the mesoporous zeolite.

The invention relates to the technical field of high polymer material recovery, in particular to a composite catalyst for preparing BHET through PET alcoholysis and a preparation method and application of the composite catalyst. The composite catalyst comprises a solid acid material which is obtained by reacting silica gel of which the surface is grafted with aluminum alkyl and ammonium hexafluorosilicate at 300-800 DEG C. The composite catalyst is suitable for the process of degrading PET by dihydric alcohol, when ethylene glycol is used as an alcoholysis agent, the yield of a main product BHET can reach 95% or above, the catalytic efficiency of the composite catalyst is high, the stability of the catalyst in the alcoholysis process is good, and an efficient catalyst is provided for industrial chemical recovery of PET.

A method for synthesizing a mesoporous nano-sized ultrastable Y zeolite includes combining a microporous Y zeolite having a SiO2 / Al2O3 molar ratio of less than 5.2 with water to form a microporous Y zeolite slurry, and heating the microporous Y zeolite slurry to 30 DEG C to 100 DEG C to form a heated microporous Y zeolite slurry. Further, the method includes sequentially or simultaneously adding 0.1 M to 2.0 M of an ammonium hexafluorosilicate solution and 0.1 M to 2.0 M of an ammonium hydroxide solution to the heated microporous Y zeolite slurry in a drop-by-drop manner to form a treated zeolite solution, and maintaining the treated zeolite solution at 50 DEG C to 100 DEG C. Finally, the method includes filtering and washing the dealuminated solution with water to form an ultra-stable Y zeolite precursor, drying the ultra-stable Y zeolite precursor, and calcining the dried zeolite precursor to form a nano-sized ultra-stable Y zeolite.

The invention relates to the technical field of antiskid articles, in particular to a preparation method of a power distribution room ground cleaning agent. Comprising the following raw materials in parts by mass: 20-25 parts of octadecanol polyoxyethylene ether, 10-15 parts of stearic acid, 15-25 parts of ammonium fluosilicate, sodium chloride, methylcellulose, tartaric acid, polytetrafluoroethylene micro powder, nano silicon dioxide, chromic oxide and acrylate. By means of the manufacturing method of the electric room floor cleaning agent, the cleaning agent which is better in anti-skid effect, good in insulation effect and longer in anti-skid effect after being used once can be prepared; the invention also provides a use method of the cleaning agent obtained by the preparation method.

The application relates to the technical field of glass etching, and particularly discloses a novel AG sand effect glass as well as a preparation method and application thereof; the glass is brushed up and down in a specific sanding liquid, and then is placed; the sanding liquid is prepared according to specific proportions of ammonium hydrogen fluoride, nitric acid, sodium chloride, ferric chloride, ammonium hexafluorosilicate and barium sulfate, and is obtained after aging; the sanding glass obtained through the preparation method has larger crystal particles on the surface, macroscopically has large roughness and high haze, and has a more smooth hand feeling, and has a uniform high flash effect; in addition, the use efficiency of the sanding liquid is improved, and the sanding liquid is particularly suitable for the field of electronic products, and is particularly suitable for the application of a mobile phone shell.

The invention belongs to the technical field of biomass catalytic conversion, and particularly discloses a gallium modified dealumination H-ZSM-5 catalyst and a preparation method and application thereof, and the method comprises the following steps: carrying out ion exchange on a Na-ZSM-5 molecular sieve and an ammonium salt solution; reacting the NH4-ZSM-5 molecular sieve with an ammonium hexafluorosilicate solution, and carrying out selective dealumination; and loading a gallium salt solution to the dealumination molecular sieve carrier DeAl-H-ZSM-5 by adopting an impregnation method to obtain the gallium modified dealumination H-ZSM-5 catalyst. According to the gallium modified dealumination H-ZSM-5 catalyst as well as the preparation method and the application thereof, through a composite strategy of selectively dealuminating and purifying a substrate and then precisely loading Ga to regulate acidity, the prepared catalyst can efficiently catalyze pentose in a gamma-valerolactone / water system to prepare furfural, and high conversion rate and high selectivity are realized.