6results about How to "Weak acid" patented technology

This invention belongs to the field of catalyst preparation technology, specifically disclosing a catalyst for the hydrogenation of carbon dioxide to low-carbon olefins, its preparation method, and its application. The preparation method is as follows: An aqueous solution of the target metal salt is prepared, a precipitant is added for co-precipitation, and the solution is filtered, washed, dried, and calcined to obtain the corresponding metal oxide. An aluminum source, triethyl phosphate, a silicon source, and an imidazole derivative template agent are added to deionized water, and mixed to form a concentrated gel. The resulting concentrated gel system is heated to crystallize without the addition of a mesoporous pore-forming agent. The crystallized product is separated, washed, dried, and calcined to obtain a molecular sieve. The metal oxide and the molecular sieve are physically mixed and ground at a mass ratio of 1:10 to 10:1 to obtain a composite catalyst. This invention, through the synergistic effect of triethyl phosphate and the concentrated gel system, induces a non-classical growth mechanism to achieve multi-level pore self-assembly, without the need for additional mesoporous template agents, and significantly reduces the amount of template agent used. The composite catalyst exhibits mild acidity and excellent diffusion performance.

This invention discloses a Mg-modified hydrogenation catalyst and its preparation method. The Mg-modified hydrogenation catalyst is a sulfide-state catalyst, comprising a support, active metals Mo and Ni, and Mg. Characterized by TEM-EDS, the Mg content distributed in the Ni-Mo-S active phase region accounts for 65%-90% of the total Mg content. The modified hydrogenation catalyst of this invention can be used to treat low-quality secondary processed heavy oils, exhibiting good processing capacity and stability, especially for feedstocks with high olefin content.

This invention provides a method and equipment for recovering lithium, fluorine, and aluminum from lithium-rich waste aluminum electrolyte, relating to the field of metal material recycling. The method for recovering lithium, fluorine, and aluminum from lithium-rich waste aluminum electrolyte includes the following steps: S1, the waste aluminum electrolyte is crushed, ground, sieved, and then dried for later use. The method provided by this invention utilizes ultrasonic-assisted leaching of lithium-containing waste aluminum electrolyte with organic acid (malonic acid). Compared with traditional inorganic acid leaching, organic acid has advantages such as good biodegradability, weak acidity, low corrosiveness, recyclability, and environmental friendliness. During neutralization, cryolite byproducts are obtained, which can be returned to the aluminum electrolysis cell for reuse, realizing the recycling of fluorine and aluminum. Finally, high-purity lithium phosphate is obtained through precipitation, effectively utilizing the lithium resources in the waste aluminum electrolyte.

The invention discloses a preparation method of polyalkylene glycol mono (methyl) acrylate, which comprises the following steps: with trifluoromethanesulfonate or supported trifluoromethanesulfonate as a catalyst, reacting hydroxyalkyl (methyl) acrylate with alkylene oxide in the presence of the catalyst and a polymerization inhibitor to obtain a polyalkylene glycol mono (methyl) acrylate crude product; and carrying out reduced pressure distillation on the polyalkylene glycol mono (methyl) acrylate crude product to separate out unreacted alkylene oxide so as to obtain a polyalkylene glycol mono (methyl) acrylate finished product. According to the invention, a solvent-free one-pot method (methyl) hydroxyalkyl acrylate and alkylene oxide ring-opening addition is constructed to prepare a polyalkylene glycol mono (methyl) acrylate system, and a solvent removal process after reaction is reduced. The trifluoromethanesulfonate has strong Lewis acidity and mild acidity, can catalyze rapid reaction, can ensure stable existence of carbon-carbon double bonds, and reduces generation of side reaction of carbon-carbon double bond polymerization.

This invention relates to the field of wear-resistant and corrosion-resistant centrifuge scrapers, specifically a wear-resistant and corrosion-resistant titanium-based composite centrifuge scraper and its preparation method. First, a vacuum consumable arc melting method is used to generate dispersed TiB whiskers and TiC particle reinforcing phases in situ within a Ti6Al4V alloy matrix, thereby improving the wear resistance of the titanium alloy. Then, the prepared ingot is centrifugally cast into a centrifuge scraper using a vacuum investment casting method. Addressing the problem of rapid wear caused by long-term scraping of salt slag layers on the scraper blade, this invention further utilizes laser cladding technology to form a gradient in-situ generated carbide layer on the blade surface, further improving the wear resistance of the centrifuge scraper. The centrifuge spiral scraper prepared by this method can meet the requirements for conveying high-halogen salts and corrosive solid-liquid two-phase substances and can be widely used in chlor-alkali, salt production, and coal chemical industries.

The invention discloses a preparation method of a catalyst for preparing dimethyl carbonate through oxidative carbonylation of methanol. The catalyst comprises the following components (in terms of oxide, a carrier is 85.0 to 92.5 wt% of Al2O3, 5.0 to 11.0 wt% of MgO, 0.1 to 1.0 wt% of Na2O, 1.5 to 3.5 wt% of a Cu-containing compound and 0.5 to 1.5 wt% of a Pd-containing compound. Alpha-beta aluminum oxide added during molding reduces the acidity of the carrier and improves the heat-conducting property of the carrier, and a magnesium-containing compound is added before strip extrusion to modify the carrier, so that the structural stability and the mass transfer property of the catalyst are improved. The catalyst prepared by adopting the technology of the patent is weak in acidity, high in active component dispersity and smooth in catalyst pore channel, and has excellent activity and selectivity when being used for preparing a dimethyl carbonate catalyst through methanol oxidative carbonylation.