39results about How to "Fewer filtering steps" patented technology

Process for treating a gas contaminated by at least one element selected from the group consisting of heavy metals, organic compounds, and combinations thereof, wherein a calcium-phosphate reactant (reagent) particle comprising apatite is brought into contact with the contaminated gas at a temperature of at least 30 DEG C and preferably at most 1100 DEG C. The metal(s) and / or organic compound(s) to be removed from the contaminated gas may be selected among the list of : Al, Ag, As, Ba, Be, Bi, Ce, Co, Cd, Cu, Cr, Fe, Hf, Hg, La, Li, Mg, Mn, Mo, Ni, Pb, Pd, Rb, Sb, Se, Sn, Sr, Th, Ti, U, V, Y,Zn, Zr, VOC, aromatic compounds, PAHs, dioxins, furans, or any mixture thereof. In such process, an alkaline compound particle comprising sodium bicarbonate, sodium carbonate, sodium sesquicarbonate (trona), quick lime, hydrated lime, lime stone or combinations thereof, may be further brought into contact with the contaminated gas.

The invention relates to the technical field of preparation technology of a Kechuanling oral solution, in particular to a preparation process of a concentrated type Xiao er Kechuanling oral solution with innovative specifications. The preparation process is simple, and a special flocculant is used to precipitate the solution, thereby eliminating a subsequent filtration step, saving production cost, improving the quality of the oral solution, and avoiding great loss of active ingredients.

The invention relates to a method for synthesizing a persantine intermediate 2,4,6,8-tetrahydroxy pyrimido[5,4-d] pyrimidine, comprising the following steps of: (1) adding nitro orotic acid in an alkali liquid, then hydrogenating with Ni / H2, and filtering to obtain an amino orotic acid solution which is directly used for next reaction without separation; (2) adjusting pH of the amino orotic acid solution with concentrated hydrochloric acid to 3, adding sodium cyanate for temperature control reaction to obtain the urea derivatives of the amino orotic acid; then dropping a 30% sodium hydroxide solution to adjust pH to 13, heating for cyclization, dropping a 50-60% sulfuric acid solution to adjust pH to 3; (3) cooling to room temperature, filtering, washing to neutrality and drying to obtainthe product. The intermediate of step (1) is not needed to separate, thereby saving a lot of time and labor, reducing about 50% of total reaction time with mild reaction condition and maximum reaction temperature reduced to 95 DEG C so that the device is less required and more durable.

The invention discloses a graphene coated silkworm excrement porous carbon composite material and a preparation method and application thereof. The preparation method comprises the following steps: mixing and swelling silkworm excrements and ZnCl2 solution, and performing freeze drying; carrying out an activating and pore enlarging reaction on the freeze-dried silkworm excrements in protective gases; cleaning, centrifuging and drying, thereby obtaining a silkworm excrement based porous carbon material; mixing graphene oxide solution with the silkworm excrement based porous carbon material, and performing centrifugal drying, thereby obtaining a graphene oxide coated silkworm excrement based porous carbon material; and adding the material into a plasma reactor, and introducing into an H2 atmosphere, thereby obtaining the graphene coated silkworm excrement porous carbon composite material. The material can be applied to aspect of pesticide sustained release. The material disclosed by the invention has high specific surface area and a graphene coated core-shell structure, and can achieve high adsorption capacity and excellent sustained-release effects on pesticides.

The invention discloses a method for producing 1,6-dimethyl adipate. The method comprises the following steps of: (1) mixing adipic acid and methanol without adding a catalyst, and performing pre-esterification reaction at the temperature of 80 and 200 DEG C under the gage pressure of between 0.05 and 3 MPa; and (2) conveying materials which are subjected to the pre-esterification reaction to the upper part of a continuous catalytic rectifying tower, and gasifying the dried methanol, conveying to the lower part of the catalytic rectifying tower, allowing the materials which are subjected to the pre-esterification reaction to contact methanol steam in a reverse flow mode in the catalytic rectifying tower and performing esterification reaction further. By the method, the problems of equipment corrosion and pollution which are caused by the utilization of a sulfuric acid catalyst in the conventional process are solved, and the defects of complex processes, large consumption level of the catalyst and the like which are caused by the adoption of two-step or multi-step catalytic esterification are overcome.

The invention provides an integrated synthetic method of 2-amino-4,6-dimethoxypyrimidine, belongs to the technical field of organic synthesis, and provides a synthetic route using malononitrile, methanol, acetyl chloride, cyanamide and alkali liquid as raw materials. The integrated synthetic method comprises the following steps: dropwise adding acetyl chloride into a system of malononitrile and methanol to directly obtain 1,3-dimethyl propadiamidine dihydrochloride, and then performing reaction on 1,3-dimethyl propadiamidine dihydrochloride and the alkali liquid and cyanamide to obtain 3-amino-3-methoxyl-N-nitril-2-propa-amidine; directly heating, evaporating solvent and performing distillation to obtain 2-amino-4,6-dimethoxypyrimidine. According to the synthetic method disclosed by the invention, a synthetic process and equipment of 1,3-dimethyl propadiamidine dihydrochloride are simple, moisture control of the system is extremely low, the quality of the product is stable, and the yield is high. By adopting the integrated synthetic process, the synthetic process is reduced, distillation is carried out under reduced pressure so as to obtain 2-amino-4,6-dimethoxypyrimidine, and thepurity of the product is up to 99.99 percent.

The invention discloses a method for extracting humic acid liquid fertilizer and inorganic iron fertilizer from Fenton iron sludge. The method includes the steps of 1, adding sodium hydroxide into the Fenton iron sludge, mixing with extracting for 6 hours, and performing centrifugation to obtain supernate as extract E1; 2, adding sulfuric acid into centrifuged sediment obtained in the step 1, and stirring with extracting in a water bath at 70 DEG C for 0.5 hour to obtain extract E2; 3, adding reduced iron powder into the extract E2 obtained in the step 2, and performing crystallizing, cooling and drying to obtain the inorganic iron fertilizer; 4, adding nitric acid into the extract E1 obtained in the step 1 so as to adjust the pH (potential of hydrogen) to neutrality, and performing concentrating to obtain the humic acid liquid fertilizer. The method has the advantages that the organic matters and iron elements in the iron sludge are made effective use and the problem of difficulty in filtering in the iron extraction process is solved.

The invention discloses a method for preparing a farmland chemical fertilizer sustained-release agent and a potash fertilizer by using biomass incineration ash, wherein the method comprises the following steps: 1, taking a certain amount of biomass ash, placing on an ash frame, then smoothly putting into a reaction kettle, injecting a nitric acid solution with the mass ratio of 25-40%, closing with a cover of a reaction kettle, and checking sealing; 2, starting up a stirrer of the reaction kettle; heating the reaction kettle; keeping stirring for 10-12 min at the temperature of 180-220 DEG C and the pressure of 1.5-1.6 MPa; 3, opening a discharge valve at the bottom of the reaction kettle, and allowing a high-temperature solution to enter a cooling pond, wherein a cooling liquid is a KNO3 saturated solution at room temperature; and after the cooling liquid is cooled, collecting a precipitated KNO3 coarse crystal salt; 4, removing the ash frame of the reaction kettle, collecting a residual solid ash matter, and adding lime to adjust the pH to 6-8, to obtain the farmland sustained-release agent; and 5, extracting a supernatant of the cooling pond to prepare a nitric acid solution, restarting the step 1, and carrying out circulating production. The method can realize efficient rapid extraction of the potassium element in the biomass ash to prepare the binary compound fertilizer and preparation of the good chemical fertilizer sustained-release agent.

The invention provides a method for preparing mono-methyl succinate. The method comprises the following steps: carrying out a mono-esterification reaction on succinic anhydride and methanol in a static mixer, conveying the reaction effluent into a high gravity reactor, and meanwhile filling water vapor into the high gravity reactor; cooling and separating the liquid material after the reaction to obtain mono-methyl succinate. The method for preparing mono-methyl succinate provided by the invention is reasonable in craft process, simple in separation method, high in product purity, good in quality and high in yield.