87results about How to "Regulate acidity" patented technology

The invention discloses a method for preparing a hydro-demetalization catalyst, which comprises the following steps of: (1) weighing two kinds of pseudoboehmite dry colloidal powder with different natures, evenly mixing, adding an extrusion aid, then, carrying out peptization, forming, drying, and roasting to prepare an alumina carrier; (2) preparing a dipping solution from a VIB metallic compound and/or a VIII metallic compound; and (3) dipping the alumina carrier prepared in the step (1) by using the dipping solution prepared in the step (2), drying an obtained wet catalyst, and then, roasting the catalyst in water-vapor-contained atmosphere to prepare the final catalyst. With the adoption of the method disclosed by the invention, the hydro-demetalization catalyst with a large pore diameter, large pore volume and concentrated pore distribution can be prepared under the condition of not using a pore-expanding agent.

The invention relates to a method for preserving white fish by removing the scales and the internal organs of the white fish, cleaning the whiter fish, cutting into sections, pretreating, preserving and storing at low temperature. The method comprises the following steps: (1) pickling the pretreated white fish with salt and garlic powder for 5-15min, cleaning the white fish, and soaking into a preservative for 20-40min; (2) subjecting the white fished treated in the step (1) to modified atmosphere packaging by using a modified atmosphere packaging machine; and (3) subjecting the packaged white fish to direct gamma irradiation by using a cobalt 60 irradiation source. The method is easy to operate and practical. Due to the adoption of the method, the freshness and the color of the meat of the white fish can be better kept, and the shelf life of the meat of the white fish can be prolonged. The preservative is convenient to use and is safe and environmentally-friendly.

The invention discloses composite agricultural fertilizer. The composite agricultural fertilizer is prepared by the following raw materials in parts by weight: 35-40 parts of straw powder, 20-25 parts of ground phosphate rock, 22-24 parts of dolomite dust, 18-20 parts of quick lime, 15-18 parts of shell powder, 12-15 parts of diatomite, 10-13 parts of turf, 7-11 parts of urea, 6-10 parts of monoammonium phosphate, 5-8 parts of potassium chloride, 3-4 parts of zinc sulfate, and 10-13 parts of soil modifier. According to the fertilizer disclosed by the invention, energy and nourishments are provided by plants to improve the utilization rate of the fertilizer, so that the yield and quality of crops are prominently improved; in addition, the soil physicochemical property and soil nutrient status can be effectively improved by the soil modifier, added in the fertilizer, so as to promote the plants to adsorb nutrients and moisture and act positive effects on soil microorganisms.

The invention discloses a modified aluminum oxide carrier and a preparation method thereof. The modified aluminum oxide carrier is prepared from aluminum hydroxide gel serving as a raw material by the steps of introducing an auxiliary agent before and/or after drying, and then forming, drying and roasting, wherein the aluminum hydroxide gel is prepared by a molten salt super-solubilizing micelle method. In the preparation process of the carrier, the aluminum hydroxide gel comprises a surfactant and a hydrocarbon component, so after the processes of forming and roasting, nano-aluminum oxide particles formed by dehydrating polymerized aluminum hydroxide still have bar-shaped basic structures and are stacked into a frame structure out of order; and the properties of a catalyst are further improved by adjusting the acidity of the carrier and the interaction between an active metal and the carrier through the auxiliary agent. The carrier has the advantages of large pore volume, large aperture, high porosity, larger orifice on the outer surface, high pore canal penetrability, favorability for increasing deposition of impurities and capacity of prolonging the running period of the catalyst.

The invention discloses a hydrotreating catalyst and a preparation method thereof. In the method, a boron aid is introduced by adding stable boron-containing organic compound solution after aluminium hydroxide is gelatinated, so that the boron aid is uniformly distributed in the catalyst and the activity phase transformation promoting effect of the boron acid is enhanced; moreover, the obtained catalyst has a high pore volume, a large specific surface area, an appropriate pore structure and appropriate acidity, enhances the activity and stability of the catalyst and is particularly suitable for the hydro-denitrogenation process of heavy hydrocarbons.

The invention discloses a protective cultivation method of a tea garden and belongs to the technical field of horticultural plant cultivation. The method comprises the steps of applying mulch to the tea garden with straw plants or growing plants or combination of straw plants and growing plants in May, and ditching between lines of tea trees before the mulch and applying base fertilizer mixed by farmyard manure, potassium sulphate for agricultural use, regular calcium superphosphate and urea; and applying urea in small holes near the tea trees once in May of the next year. According to the protective cultivation method of the tea garden, contents of organic matter, soil alkali-hydrolyzable nitrogen, available phosphorus and available potassium in top soil are improved fast after three months, soil acidity is adjusted, soil environment is improved, the water content of soil is greatly improved, water and soil loss is reduced, tea quality is improved, the soil structure in the tea garden is changed, the fresh leaf yield ratio is increased by 11.3-15.6% comparatively, income is increased, and protective cultivation and sustainable development of the tea garden are achieved.

The invention provides a novel peroxoheteropolyacid-based ionic liquid and a preparation method of the ionic liquid. The ionic liquid is first reacted with an alkylimidazole and a sultone to generate an ionic liquid intermediate, and then the ionic liquid is The liquid intermediate is reacted with a peroxoheteropolyacid solution, and its general structural formula is: RxH3-x{QO4[MO(O2)2]4} where: Q is a P or As atom, and M is a Mo or W atom , R is, m is 0~8, n is 3 or 4, and x is 1~3. The new ionic liquid has strong Brönsted acidity and oxidation.

The invention discloses a recycling treatment process for chlorohydric acid pickling liquid waste. The process comprises the following steps: adjusting the acidity of CaCO3 of the chlorohydric acid pickling liquid waste to 99.65-124.56g/L; adding ferrous chloride so as to enable ferrite to be in a saturation condition; heating to the bubble point, then feeding the mixture into a rectifying tower and separating, wherein the pressure in the rectifying tower is 61.05-67.50Kpa; recovering a 10-15% diluted hydrochloric acid liquid and ferrous chloride crystals. Through reasonable parameter control and decompressing and rectifying processes, hydrochloric acid liquor applicable to acid pickling steel pieces as well as a coagulant capable of being used for sewage and wastewater treatment or a chemical raw material ferrous chloride can be recovered just by means of materials generated in the steel piece acid pickling process without spending other raw materials, so that the cost is greatly saved. The process is process-investment-saving, low in energy consumption and easy for mastering of operation, and can be continuously operated or intermittently operated in batches, thereby realizing automatically controlled operation.

The invention provides a selective hydrodesulfurization process which comprises the following steps: cutting a gasoline feedstock into light ends and heavy ends; performing liquid-liquid extraction for the light ends to obtain light end raffinate containing olefins and light end extraction oil containing sulfide and aromatics; and using selective hydrodesulfurization catalysts to perform selective hydrodesulfurization for the light end extraction oil and the heavy ends, wherein the main component of the selective hydrodesulfurization catalyst is obtained by loading an active metal component with a metal oxide, treated with a metal salt, as the carrier, wherein the active metal is selected from more than two elements in IA, VIII, VIB and VIIB groups in the periodic table. The selective hydrodesulfurization process provided by the invention has the advantages of high desulfurization rate and small loss of the octane value of sweet gasoline.

The invention relates to a core-shell structured nano monocrystal ZSM-5@Silicalite-1 molecular sieve and a preparation method thereof. According to the preparation method, a nano ZSM-5 molecular sieveis used as a core phase, and the grain size is 50 to 800 nm; a nano Silicalite-1 molecular sieve is used as a shell phase, and a shell layer is 5 to 100 nm in thickness; after the outer surface of the core-phase ZSM-5 molecular sieve is pretreated with a weakly acidic solution, the core-phase ZSM-5 molecular sieve is subjected to hydrothermal crystallization in a shell-layer molecular sieve growth solution system, so that the nano monocrystal ZSM-5@Silicalite-1 molecular sieve containing a compact shell layer is prepared. The molecular sieve provided by the invention has the characteristics of a continuous porous channel, low diffusion resistance, high integration mechanical intensity and high selectivity; furthermore, the molecular sieve can be effectively applied to a catalytic crackinggasoline hydrogenation modification process, and has excellent catalysis performance on aspects of aromatics shape-selective disproportionation, shape-selective alkylation, shape-selective isomerization, catalytic cracking gasoline hydrogenation modification and the like.

The invention discloses a fresh-cut Chinese yam fresh keeping agent. The fresh keeping agent comprises 0-0.1% of gamma-aminobutyric acid, 0.5-2.5% of calcium lactate, 0.05-0.1% of zinc acetate, 5-10% of a garlic extract liquid, 10-20% of a loquat leaf extract liquid, and the balance of purified water. The fresh keeping agent overcomes the restriction problems of difficult effective freshness keeping and difficult effective preservation time prolongation of present natural fresh keeping agents, and can greatly prolong the preservation time of fresh-cut Chinese yam and greatly improve the preservation freshness of foods due to compounding of synthetic additives with low concentrations and pure natural additives.

The invention discloses a method and system for producing diesel oil from an inferior oil material. The method includes the steps: mixing the inferior oil material with waste plastics, then carrying out a pyrolysis reaction, then making an obtained pyrolysis gas contact with a catalyst and carrying out a catalytic reaction, separating the obtained catalytic reaction product to form a gas-phase product and a liquid-phase oil product, and hydrotreating the liquid-phase oil product to form naphtha and diesel oil. The obtained naphtha can go to an ethylene-removing cracking unit to be used as a cracking raw material, and the obtained diesel oil can be used as a qualified diesel oil product and leaves factories. The method has the advantages of simple process and cheap and easily obtained raw materials, can make full use of the waste plastics, the inferior oil material and other resources, and also is green and environmentally friendly; and the yield of light fuels can reach more than or equal to 95%, and the obtained diesel oil has good quality.

The invention discloses a method for preparing a hydro-demetalization catalyst, which comprises the following steps of: weighing or preparing an alumina carrier; (2) preparing an ammonia solution or an aqueous solution from a VIB metallic compound and/or a VIII metallic compound; and (3) dipping the alumina carrier obtained in the step (1) by using the solution prepared in the step (2), preheating an obtained wet catalyst in water-vapor-contained atmosphere, then, drying in air atmosphere, and then, roasting the catalyst to prepare the final catalyst. The hydro-demetalization catalyst prepared through the method disclosed by the invention is even in the distribution of active components and has higher activity and higher activity stability.

The invention discloses a preparation method and application of a non-sulphurized hydrodeoxygenation catalyst, and belongs to the technical field of catalyst synthesis. In order to solve the problems of the conventional hydrodeoxygenation catalyst, the invention provides the preparation method of the non-sulphurized hydrodeoxygenation catalyst with a unique porous structure. The preparation method comprises the following steps: firstly preparing an MIL-77 precursor solution, then adding heteropoly acid to obtain a mixed solution, then performing a hydrothermal reaction, and finally centrifuging, washing and drying to obtain an HPA@MIL-77 non-sulphurized hydrodeoxygenation catalyst which can be applied to a hydrodeoxygenation reaction of a model compound with phenol as bio-oil. The non-sulphurized hydrodeoxygenation catalyst prepared by the preparation method provided by the invention can be synthesized into the HPA@MIL-77 catalyst by a one-step method, and MIL-77 with high specific surface area can effectively control the HPA loading amount and regulate the acidity of the catalyst, so that improvement on the selectivity of a hydrodeoxygenation product is facilitated.

The invention provides a process method for preparing ethyl tert-butyl ether. The process method comprises the following steps of: taking isobutene and ethanol as raw materials, and using a heteropoly acid/aluminum-based complex oxide catalyst, wherein the heteropoly acid/aluminum-based complex oxide catalyst takes a complex oxide as a carrier and takes heteropoly acid as an active component, the complex oxide is one or more of aluminum-based complex oxides in MgO-Al2O3, TiO2-Al2O3 and ZrO2-Al2O3, and the heteropoly acid is one or more of phosphotungstic acid, silicotungstic acid, arsenotungstic acid, germanotungtic acid, phosphomolybdic acid, silicomolybdic acid, arsenomolybdic acid, germanomolybdic acid and the like. According to the process method provided by the invention, the catalyst adopting the aluminum-based complex oxide to load the heteropoly acid is adopted, so that the shortcomings of inactivation of the catalyst and reduced conversion rate, which are caused by easiness in damaging the Keggin structure of the heteropoly acid of the heteropoly acid catalyst, easiness in loss of acid amount and difficulty in separation, can be overcome.

The invention discloses a regeneration method for a dehydrogenation catalyst. The dehydrogenation catalyst is a chromium-aluminum catalyst. The regeneration method comprises the following steps: subjecting the deactivated dehydrogenation catalyst to regeneration in the presence of gas containing oxygen, wherein regeneration temperature is 400 to 600 DEG C and regeneration time is 0.1 to 2.0 hours; then cooling the dehydrogenation catalyst to 100 to 250 DEG C; and treating the dehydrogenation catalyst with organic-acid-containing air and water vapor in a specific ratio for 0.1 to 4.0 hours. The method can remove carbon deposit and improve early activity and resistance to carbon deposition of the regenerated catalyst and enables properties of the regenerated catalyst like selectivity and stability to basically return to the level of a fresh catalyst.

The invention discloses coconut vinegar and a preparation method thereof; the coconut vinegar is composed of coconut flesh, apple, grape seeds, honey, corn flour, glutinous rice and sugar as raw materials, can effectively reduce cholesterol, and has the multiple health efficacies of tonifying brain and nourishing blood, calming spirit and making sleeping peaceful, clearing liver-heat and removing heat, maintaining beauty and keeping young, invigorating spleen and replenishing qi, dispelling wind-evil, and dispersing toxins. The fermentation time and temperature are strictly controlled in the preparation process, so that the raw materials can be fully fermented in an optimum environment, so as to use the raw materials to the greatest extent and avoid waste.

The invention belongs to the field of flower planting and particularly discloses a rhododendron lapponicum planting method. The method comprises steps including land selection, control of soil pH, hole digging, plantation, fertilization, management and the like. The problem that rhododendron lapponicum cannot be manually planted in batches because of freezing damage and pest and disease damage is solved through stereoscopic plantation of rhododendron lapponicum, cinnamomum camphora and tamarind pulp and application of water-absorbent resin, nitrogen dioxide and sulfur dioxide, and the economic benefits are improved to a large extent.

The invention discloses a catalyst modification method for improving a yield of hydrocarbons produced by catalytic pyrolysis of biomass, and belongs to the field of biomass resource conversion and utilization. The method comprises the following steps: 1, tabletting and molding a powdery HZSM-5 molecular sieve, then crushing and screening particles, 2, placing the HZSM-5 molded particles in a carrier gas atmosphere containing water vapor, and carrying out constant temperature treatment, and 3, calcining the HZSM-5 molded particles subjected to water vapor treatment in air at a constant temperature, and cooling to obtain the modified HZSM-5 catalyst. By adopting the technical scheme provided by the invention, the skeleton structure and acidity of the HZSM-5 catalyst can be adjusted, the catalytic performance of the HZSM-5 catalyst in biomass pyrolysis steam catalytic conversion reaction is improved, and compared with an unmodified HZSM-5 catalyst, the yield of hydrocarbon target productsin biomass catalytic pyrolysis reaction is effectively improved.

The invention discloses an acid soil conditioner based on tropical agricultural by-products. The acid soil conditioner is prepared from the following raw materials in parts by weight: 20-70 parts of biochar, 20-80 parts of an alkaline material, 1-5 parts of nano oxide and 120-180 parts of a glue solution. According to the soil conditioner, the sodium alginate glue solution is used, so that the powdery alkaline material is compounded with the granular charcoal, and runoff and infiltration of nutrients and alkaline materials along with rainwater are reduced; with the degradation of the glue, thecomposite amendment material can continuously and effectively neutralize soil acidity, improve soil structure and increase soil organic matter content, so that ideas and ways are provided for resource utilization of tropical agricultural by-products and soil fertility improvement in a hot area.

The invention discloses a preparation method and application of an aluminum monatomic catalyst. The preparation method comprises the following steps of: polymerizing styrene in an inner hole of an aluminum-based metal organic framework material adsorbing styrene under a heating condition, carrying out carbonization and fluorination, and then washing a fluorination product with hot ammonia water toobtain the aluminum monoatomic catalyst. The catalyst can be applied as a catalyst to dehydrohalogenation or fluorine-chlorine exchange reaction. The aluminum monatomic catalyst prepared by the invention has the advantages of simple preparation method, large specific surface area, high effective utilization rate of aluminum atoms, high catalytic performance, long service life and great application prospect.