147results about How to "Weak acid" patented technology

The invention relates to methanol-to-gasoline catalysts, in particular to a ZSM-5 / MCM-48 composite molecular sieve, a preparation method and application thereof. The composite molecular sieve adopts a ZSM-5 microporous molecular sieve as the seed crystal, on the surface of which a MCM-48 mesoporous structure composite molecular sieve that is chemically interlinked at a mesoporous and micropore interface is obtained by overgrowth. The composite molecular sieve undergoes acidification, and then is mixed with a binder to undergo molding and roasting, and the product is used as a catalyst for methanol-to-gasoline (MTG) reaction. The catalyst provided by the invention is used for overgrowth of the mesoporous molecular sieve on the microporous molecular sieve surface, integrates the advantages of the microporous material and the mesoporous material so as to develop the strong points and avoid the weak points and reach a synergistic effect. The catalyst shows good catalytic properties to the methanol-to-gasoline (MTG) reaction, has high selectivity to gasoline products and a low aromatic hydrocarbon content, and extends the carbon chain length. More importantly, the problems of high reaction temperature, high aromatic hydrocarbon content in oil products, and limitation of hydrocarbon compounds only to less than C11 in traditional MTG technologies are solved.

The invention relates to a combined treatment method of 1,4-butanediol production wastewater, which comprises the following steps: carrying out physical and chemical pretreatment on wastewater firstly so as to obtain pre-optimized wastewater; improving the biodegradability of the wastewater and further reducing the COD (chemical oxygen demand) concentration of the wastewater through an upflow anaerobic reactor and an aerobic combined biochemical reaction tank; and after the muddy water separation of the wastewater is realized through a secondary sedimentation tank, sequentially feeding the wastewater into a coagu-flocculation reaction settling pond and a biological filter, carrying out deep treatment on the wastewater, removing substances such as tiny suspended solids and colloids and the like in the wastewater through coagu-flocculation reaction and precipitation, and enabling discharged water to meet the requirements of one-class A standards in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB18918-2002) through the synergistic effect of adsorption and biodegradation of the biological filter. The method disclosed by the invention not only has a stable removal effect on COD in 1,4-butanediol production wastewater, but also can effectively resist violent water impacts; and the method has the characteristics of rapid system startup and the like. The method disclosed by the invention also can be applied to the treatment of other high-concentration toxic degradation-resistant organic wastewater with a water quality similar to that of 1,4-butanediol production wastewater.

A composite molecular sieve-based catalyst for methanol to gasoline is prepared by the following method: (a) template and aluminium source are dissolved in deionized water and stirred until the deionized water is clear, silicon source and alkali source are then dripped in, and after crystallization under the hydrothermal conditions of self-generated pressure and crystallization temperature, ZSM-5 molecular sieve precursor is prepared; (b) the ZSM-5 molecular sieve precursor and the alkali solution of cetyl trimethyl ammonium bromide as template are mixed, and after crystallization under the hydrothermal conditions of self-generated pressure and crystallization temperature and roasting, ZSM-5 / MCM-48 composite molecular sieve is prepared; (c) the ZSM-5 / MCM-48 composite molecular sieve and acid solution are subjected to ion exchange and are roasted, so that acidic HZSM-5 / MCM-48 composite molecular sieve is prepared; (d) the HZSM-5 / MCM-48 composite molecular sieve and binder are uniformly mixed, kneaded with nitric acid solution with volume concentration less than 10 percent to shape and roasted, so that the catalyst is prepared. The invention also discloses the preparation method for the catalyst.

The present invention discloses a waste hydrogenation catalyst utilization method, which comprises: grinding a waste hydrogenation catalyst, soaking with ammonia water, adding alumina, a binder and an acid solution to the remaining solid, and carrying out mixing kneading molding; carrying out reducing treatment with hydrogen gas in a high pressure reaction kettle; adding a polyol and / or furfural solution to the high pressure reaction kettle, and carrying out a hydrogenation reaction; and drying the material obtained after the reaction until the surface is liquid-free, sequentially contacting an organic acid, ammonium or ammonia, and loading a heteropoly acid to produce the catalyst for ethylene preparation through ethanol dehydration. According to the present invention, with the method, the hydrogenation activity metal component and the carrier component in the waste hydrogenation catalyst are utilized, and the hydrogenation activity of the waste hydrogenation catalyst is completely utilized, such that the utilization rate of the waste catalyst is improved, the pollution problem of the waste catalyst is solved, and the obtained catalyst for ethylene preparation through ethanol dehydration has the excellent performance.

The invention provides a method for electroplating a protective plating layer of high-strength corrosion-proof cadmium-tin-titanium alloy on a 304 or 316 L stainless steel surface. The corrosion resistance of a plating layer is 6 to 7 times higher than that of a cadmium-plated layer, and the plating layer is uniform and fine and can be matched with cadmium-plated cyanide; after surface pre-treatment and in advanced cadmium-plating, the binding force of a cadmium-tin-titanium alloy plating layer is far more than that of the same kind of cadmium-tin plated alloy and the cadmium-plated layer; the cadmium-tin-titanium plating layer is porous, so that the hydrogen is beneficial for escaping; the cadmium-tin-titanium plating layer has good paintability, weldability, formability and low-hydrogen embrittlement; the whole preparation process is simple, cyanogen-free electroplating is achieved, and the preparation process is safe and environmentally-friendly.

The invention discloses a hydrocracking catalyst and a preparation method therefor. The hydrocracking catalyst comprises an acidic component, hydrogenation metal components and a carrier, wherein the acidic component is an ammonium salt of heteropoly acid, the hydrogenation metal components comprise Mo and Ni, P serves as an assistant, and silicon oxide serves as the carrier. The invention further provides the preparation method for the hydrocracking catalyst. When the catalyst prepared by the method disclosed by the invention is applied to a hydrocracking reaction of long-chain alkanes, relatively high reaction activity and liquid hydrocarbon selectivity are achieved.

The present invention provides one-section hydrogenation process for producing food level white oil. By using vacuum gas oil, deasphalted solvent oil and Fischer-Tropsch process oil as material, and hydrogenating catalyst containing modified beta-molecular sieve in 1-9 wt%, and through hydrocracking or hydrogenating, hot high pressure separating out gas and light distillate to obtain liquid product, mixing with newly formed hydrogen, and high pressure hydro-finishing in a reactor with loaded reduction type hydrogenating catalyst, food level white oil is produced. The process is simple and has high product quality.

The invention relates to styrylphenol polyoxyethylene ether and a preparation method thereof, and belongs to the technical field of carbocyclic compounds. The method includes three steps of phenol alkylation reaction, ethylene oxide addition polymerization, polyether aftertreatment; to be more specific, feeding nitrogen in phenol and alkylation catalyst for heating up 80-100 DEG C, and dropwise adding styrene prior to heat reaction till the refractive index of the product reaches 1.5985-1.6020; heating up to 100-110 DEG C, performing vacuum dehydration prior to cooling and adding polymerization catalyst, heating to 80-120 DEG C under the atmosphere of nitrogen, and adding ethylene oxide for complete reaction at the temperature of 80-120 DEG C under the pressure of 0.01-0.04MPa; adding deionized water prior to heating to 60-70 DEG C, adding phosphoric acid and adsorbent with stirring prior to vacuum dehydration, and performing filtering to obtain the finished product. The preparation method can be applied to preparation of nonionic surfactants such as styrylphenol polyoxyethylene ether, and the product has the advantages of narrow distribution, light color, low content of K + / Na + ions and the like.

The invention relates to a method for hydrogenating naphthenic base distillate to produce lubricating oil basic oil. The naphthenic distillate is used as raw material and a one-stage in series hydrogenation process of hydrotreating-hydrodewaxing-hydrofinishing is adopted to produce the lubricating oil basic oil. Ordinary hydrotreating catalysts are filled in the upper part of a hydrotreating reaction area, and hydrotreating catalysts containing modified zeolites are filled in the lower part of the hydrotreating reaction area. The hydrodewaxing and hydrofinishing reaction areas are the same as those of the prior art, and are filled with hydrodewaxing catalysts and hydrofinishing catalysts. Compared with the prior art, the method disclosed by the invention has the advantages that system energy consumption is reduced, the pour point of a product is properly reduced, and the stability of the product is effectively improved.

The invention discloses a catalyst for preparing trimethylolpropane through hydrogenation of 2,2-dimethylolbutyraldehyde and a preparation method of the catalyst. The catalyst comprises 35 to 70 wt% of copper oxide, 5 to 25 wt% of zinc oxide, 5 to 35 wt% of aluminum oxide, 10 to 30 wt% of silicon dioxide, 0.5 to 5 wt% of alkaline earth metal oxide, 0.05 to 1.0 wt% of palladium oxide, 0.01 to 1.0 wt% of iridium oxide and 0.01 to 1.0 wt% of tin oxide. When the catalyst is used for preparing trimethylolpropane by a hydrogenation method, the catalyst not only has good activity and selectivity, butalso has strong formate conversion capability and high mechanical stability.