9results about How to "Reduce nitrogen content" patented technology

The invention discloses a process method for selective deep desulfurization and denitrification of aromatic-rich fractions. The process method comprises the following steps: (1) mixing aromatic-rich diesel oil with hydrogen, and then feeding the mixture into a pre-hydrogenation reaction zone I for pre-hydrogenation dealkene reaction; (2) a product obtained in the step (1) enters a hydrofining reaction zone II for a hydrofining desulfurization and denitrification reaction; (3) carrying out flash evaporation on the product obtained in the step (2) to separate recycle hydrogen, enabling the obtained refined diesel oil to enter a moving bed adsorption denitrification reaction zone III, and carrying out deep adsorption denitrification reaction on the refined diesel oil under the action of an adsorption denitrification agent to obtain a desulfurized and denitrified refined aromatic-rich diesel oil component; and (4) enabling the inactivated adsorption denitrification agent in the step (3) to enter an adsorbent regeneration area IV, and completing reduction and drying of the inactivated adsorption denitrification agent under the action of a desorption agent to obtain the cyclically regenerated adsorption denitrification agent. According to the process method, deep removal of the sulfur-containing nitrogen-containing compound can be realized, and the investment cost is also greatly reduced.

The application discloses a planting method for improving tobacco quality, and the fertilization mode of the planting method is set as T3, or T4, or T5. The fertilization treatment is beneficial to tobacco plant growth, tobacco carbon and nitrogen metabolism, tobacco leaf quality, and improves tobacco leaf yield.

This invention discloses a method for controlling the nitrogen content of molten steel in a converter with low iron consumption mode, belonging to the field of steel manufacturing technology. The method includes the following steps: controlling the molten iron inlet temperature to 1310-1330℃, controlling the silicon content in the molten iron to 0.30%-0.50%, controlling the molten iron charging ratio to 65-70%, and the scrap steel charging ratio to 30-35%; controlling the converter iron-to-steel ratio to 720-750 kg / t; after adding scrap steel into the furnace, shaking the furnace back and forth until the furnace mouth flame is normal, and baking the scrap steel; adding 50% of the slag in the first 4 minutes of the converter blowing process, and then adding the remaining slag in small amounts multiple times over 4-8 minutes, controlling the furnace temperature, and stirring the molten pool back and forth from high to low with an oxygen lance before the end point; using nitrogen-argon switching bottom blowing during the converter blowing process; adding ladle slag modifier before tapping, and then adding deoxidizer for alloying, while simultaneously performing ladle bottom blowing with argon. The control method of the present invention can control the nitrogen content of converter steel to within 40 ppm under the condition that the iron-to-steel ratio in the converter is as low as 720-750 kg / t.

A sealing device for a converter oxygen lance insertion hole belongs to the technical field of converter top-blowing equipment and is used for preventing smoke from escaping from the converter smelting top-blowing oxygen lance insertion hole. According to the technical scheme, an insertion hole connecting flange is welded to the periphery of the upper end of an oxygen lance insertion hole, a sealing seat is a circular ring, the circular ring periphery of the sealing seat is connected with the insertion hole connecting flange through bolts, a circular ring inner hole of the sealing seat is conical, and the conical lower end of the circular ring inner hole of the sealing seat is matched with the diameter of the upper end of the oxygen lance insertion hole. The oxygen lance body is sleeved with the sealing plug, the periphery of a circular ring of the sealing plug is conical, the periphery of the sealing plug is connected with an inner hole of the sealing seat in a matched mode, the guide cylinder is a cylinder, the lower end of the guide cylinder is welded to the upper end face of the sealing plug, and the guide cylinder is sleeved with the gas collecting cover which is a cylinder. The lower end of the gas collecting cover is welded to the outer edge of the upper end of the sealing seat. A nitrogen sealing structure is omitted, the oxygen lance insertion hole can be sealed, and smokeless operation is achieved.

The invention discloses a composite microbial preparation and application thereof in treatment of mariculture wastewater, and relates to the technical field of microbial agents. According to the preparation method, bacillus velezensis, halobacillus dakamoyi and Starproteia are used as fermentation strains, fermentation is performed to obtain a fermentation bacterial liquid, and then gamma-polyglutamic acid, sodium alginate and calcium chloride are utilized to perform immobilization treatment on the fermentation bacterial liquid to prepare the compound microbial preparation. The prepared composite microbial preparation is added into the mariculture wastewater, so that the total nitrogen content, the total phosphorus content and the COD content in a water body can be effectively reduced, the efficient treatment of the mariculture wastewater is realized, and the water quality stability is improved. Wherein the bacillus velezensis, the halobacillus dakamoyi and the Starproteinia are combined for use, and a synergistic effect on reducing the removal efficiency of total nitrogen in the mariculture wastewater is achieved.

The application discloses a kind of gas magnetization energy-saving devices, it is related to magnetization energy-saving device technical field, the gas magnetization energy-saving device, including magnetization equipment body, magnetization equipment body includes front shell, rear shell and gas flow pipe, front shell and rear shell are set in front and back two sides of gas flow pipe, the outer surface of front shell and rear shell is fixedly connected with mounting block, the outer surface of gas flow pipe is fixedly connected with two symmetrical first fixed blocks, the top of gas flow pipe is provided with gas pipe, the gas magnetization energy-saving device, by making gear drive fixed rod slide out the inside of fixed groove, so that the fixation of gas flow pipe and gas pipe is removed, so that the connection of gas flow pipe and gas pipe is more convenient, and staff can more smoothly install and disassemble magnetization equipment body, so that staff can conveniently carry out post-maintenance to magnetization equipment body, simultaneously, staff can more conveniently use device.

The invention provides a method for preparing low-protein natural rubber through enzyme compounding, and belongs to the technical field of preparation of low-protein natural rubber products. When the low-protein natural rubber is prepared, pancreatin and trypsin are matched according to the mass ratio of 1: 1, and when the dosage is 0.2 wt%, the protein content of a sample is the lowest. The low-protein natural rubber prepared by the process is superior to acid-coagulated natural rubber in tensile strength, aging property, Mooney viscosity and the like. Compared with the use of the traditional single protease, the use of the compound protease is obviously better than the use of the single protease, and the nitrogen content in the natural rubber can be reduced to about 0.086%; compared with a centrifugal method for preparing the low-protein natural rubber, the technology provided by the invention is simple in process, convenient to operate and more suitable for large-scale production while achieving an ideal effect.

The application relates to a continuous solvent-free reaction synthesis method of cycloxazidone, and belongs to the technical field of organic synthesis. The method comprises the following steps: taking ethyl chloroformate and monocyane as raw materials to generate N-cyano ethyl carbamate; dimethyl sulfate is added to generate N-cyano-N-methyl ethyl carbamate; dimethylamine hydrochloride aqueous solution is added to generate ethyl N-methyl-N-(N', N'-dimethylformamidino) carbamate; cyclohexyl isocyanate is added to generate ethyl N-methyl-N-[(cyclohexyl carbamoyl) (dimethylamino) methylene] carbamate; and the ethyl N-methyl-N-[(cyclohexyl carbamoyl) (dimethylamino) methylene] carbamate is subjected to a cyclization reaction to generate cycloxazidone. The method avoids the large use of toxic and harmful solvents such as chloroform, and the wastewater after the reaction basically does not contain dimethylamine, and the COD and total nitrogen content are greatly reduced.

This invention provides a method for extracting and purifying long-chain dicarboxylic acids from fermentation broth, comprising the following steps: 1) Solid-liquid separation: performing a first solid-liquid separation on the long-chain dicarboxylic acid fermentation broth to obtain insoluble matter 1 and filtrate 1; 2) Slurry conditioning and dehydration: conditioning the insoluble matter 1 with a short-chain organic acid and performing a second solid-liquid separation to displace the water in the insoluble matter 1, obtaining insoluble matter 2 and filtrate 2; 3) High-temperature dissolution: dissolving the insoluble matter 2 with a short-chain organic acid at 80-85°C to obtain a solution; 4) Ceramic membrane filtration: filtering the solution through a ceramic membrane at 80-85°C and collecting the permeate; 5) Purification: purifying the permeate to obtain the long-chain dicarboxylic acid product. The method of this invention has advantages such as thorough protein removal, product purity exceeding 98.5%, low total nitrogen content, white color, and fully meeting the requirements of polymerization-grade products.