745results about How to "Reduce nitrogen content" patented technology

The invention relates to a method for generating the high quality ethylene raw material through naphtha hydrogenation. The method takes naphtha fraction and animal and vegetable oil as the raw material oil, under the condition of hydrofining, the raw material oil and hydrogen are mixed and passed through a hydrofining reaction area, the hydrogen-rich gas recycling utilization can be acquired through separating the hydrofining generated oil, and low Sulfur, low hydrogen and low aromatic naphtha can be acquired through removing hydrogen sulfide of the separated liquid with an air stripping tower. Compared with the prior art, the method has the advantages that the oil is mixed in the naphtha hydrogenation raw material, the quality of the product as the ethylene cracking raw material, in particular to aromatic long chain hydrocarbon nC16 to 18 and propane acquired through the animal and vegetable oil hydrogenation, can be remarkably improved, the cracking furnace ethylene output can be increased and the cracking furnace life can be prolonged through adding the aromatic long chain hydrocarbon nC16 to 18 and propane in the ethylene cracking raw material.

A hydrogenation method for producing high-quality diesel oil and high-quality reforming materials comprises the following steps of: mixing diesel oil and/or a light wax oil material with hydrogen gas, and sequentially contact-reacting with a hydrorefining catalyst and a hydrocracking catalyst without middle separation, cooling the reaction result, and separating to obtain a light naphtha fraction, a heavy naphtha fraction, a kerosene fraction, a diesel oil fraction and a tail oil fraction, wherein the kerosene fraction and/or the tail oil fraction can be directly extracted or partially or completely recycled back to the reaction system. By adopting single-stage once-through process and a non-noble metal catalyst, the invention can produce the reforming materials with high aromatic content and the diesel oil fraction with high cetane number, wherein the yield of the reforming material is larger than 20wt%, and the cetane number of the diesel oil fraction can be improved by more than 15 units. The method provided by the invention has high operation flexibility and can flexibly adjust the technical scheme according to different raw materials and different product scheme requirements.

A process for hydrotreatment of a hydrocarbon feed comprises at least two reaction steps with intermediate fractionation of the effluent from the first step to eliminate unwanted impurities for the catalyst of the second step and to produce a desulphurized light liquid fraction. The intermediate fractionation comprises stripping the liquid effluent from the first step using low pressure hydrogen with rectification of the stripping vapours using a substantially desulphurized liquid reflux. The conditions for said fractionation and for the first hydrotreatment step can produce a substantially desulphurized light liquid fraction which is not supplied to the second step.

A two-way combined process of wax oil hydro-process and catalytic crack is carried out by entering wax oil, catalytic cracking re-circulating oil and catalytic cracking diesel oil into hydro-processor, hydrogenation reacting under existence of hydrogen and hydrogenation catalyst, separating for reactant to obtain gas, hydrogenation naphtha oil, hydrogenation diesel oil and hydrogenation tail oil, entering hydrogenation tail oil into catalytic cracker, crack reacting under existence of catalytic cracking agent, separating to obtain dry gas, liquefied gas, catalytic cracking gasoline, catalytic cracking diesel oil and catalytic cracking re-circulating oil and oil slurry, and circulating for catalytic cracking diesel oil and catalytic cracking re-circulating oil to hydro-processor. It has higher recovery rate and cetyl value, less sulfur content, arene content and coke output.

The making of Fe-6.5Si alloy magnetic powder core comprises grain proportion, alloy powder inactivating, adding insulation agent to the metal powder, binder, lubricant and stripping agent, compression, heat treatment, solidification, surface coating, with the inactivating treatment getting phosphopyruvic acid with 5-15% phosphate chrome, the rest being acetone, adding alloy powder with 2-6% of mass percentage. Adding small quantity Ti nor Ni, it can reach the saturated alloy magnetic sensing strength BS value of 16000- 18000 Gaussian, coercitive force <=80A/m. It has better forming and compression feature. It reduces broken stress. The made magnetic powder core having magnetic conductivity of 125, with low metal core consumption.

A Ni-base heat resistant alloy excellent in weldability and strength at elevated temperatures and suited for use in manufacturing cracking furnace tubes and reformer furnace tubes to be used in ethylene plants as well as a welded joint therefor is provided. The alloy of the invention is a Ni-base heat-resistant alloy, which comprises C: not more than 0.1%, Si: not more than 2%, Mn: not more than 2%, P: not more than 0.025%, S: not more than 0.005%, N: not more than 0.04%, Cr: 10 to 30%, Al: 2.1 to less than 4.5%, and Mo: 2.5 to 15% or W: 2.5 to 9% or Mo and W: 2.5 to 15% in total, and satisfies the relation (1) given below:<paragraph lvl="0"><in-line-formula>(104Si+1980P+1980S+9Al+15Ti+11Nb+1.8W+11600B)<={1.1(240-20000S-1900P-30Al-10Ti-9W+17000B) (1)</in-line-formula>In the welded joint of the invention, both of the base metal and weld metal are made of the alloy having the above composition, and the ST value of the weld metal as calculated according to the following formula (2) or (3) is larger by not less than 3 than the ST value of the base metal:<paragraph lvl="0"><in-line-formula>in the case of Ti<=4C; ST-Mo+1.5W+100Ti (2)</in-line-formula><paragraph lvl="0"><in-line-formula>in the case of Ti>4C; ST=Mo+1.5W+400C (3).</in-line-formula>

The invention provides a method for hydrocracking of coked wax oil, which comprises: contact reaction of raw materials, hydrogen and a hydrogenation protection catalyst under the condition for hydrogenation protection reaction, wherein oil in the raw materials is coked wax oil or mixed oil containing coked wax oil; contact reaction of products in the hydrogenation protection reaction, products ofhydrocracking reaction and a hydrogenation refining catalyst under the condition for hydrogenation refining reaction; separation of light distillates, intermediate distillates and heavy distillates with initial boiling points being 350-360 DEG C from products of the hydrogenation refining reaction; and contact reaction of the heavy distillates with the initial boiling points being 350-360 DEG C and a hydrocracking catalyst under the condition for hydrocracking reaction, thereby obtaining products of the hydrocracking reaction. The method of the invention prolongs the operating cycle of the device, the consumption of the hydrocracking catalyst is low, and the yield of the intermediate distillates in the products is high.

The invention discloses a hydrorefining catalyst and a preparation method thereof. The catalyst is a bulk phase hydrorefining catalyst, and comprises alumina and hydrogenation active metal components W, Ni and Mo. The surface phase of the catalyst has the characteristics of high content of active metals, large density of active sites, uniform dispersion of the active metals, good coordination and cooperation among the active metals, and high utilization rate of the active metals, and the catalyst has the characteristics of reasonable pore structure, high mechanical strength and high hydrodesulfurization and hydrodenitrogenation reaction performances, and is especially suitable for being applied to ultra deep hydrodesulfurization and nitrogen removal reaction of diesel oil fraction.

The invention discloses polyphenylene sulfide with low chlorine content, a preparation method of the polyphenylene sulfide, a resin composition and a formed body. The polyphenylene sulfide with low chlorine content is prepared by performing end-capping 4-thiophenyl-benzenethiol. The method for preparing the polyphenylene sulfide disclosed by the invention comprises the following steps: taking a sulfur-containing compound, an alkaline matter and paradichlorobenzene as raw materials, taking fatty acids as polycondensation additives, taking 4-thiophenyl-benzenethiol (PTT) as an end group regulator, and carrying out a condensation polymerization reaction. The method disclosed by the invention is high in product yield and low in cost, the obtained polyphenylene sulfide product is low in chlorine content and has excellent fluidity and heat resistance. Therefore, the operating requirements of low chlorine and high fluidity in electronic enterprises can be met.

The invention discloses a hydrogenation combined method for diesel oil, which comprises the following steps: dividing a straight-run diesel oil raw material and/or a coking diesel oil raw material into two parts of materials, performing hydro-upgrading reaction on one part of the material after being mixed with a catalytically cracked diesel oil raw material, and performing hydro-refining reaction on the other part of the material. The hydro-refining reaction and the hydro-upgrading reaction share a set of hydrogen recycling system. The combined method of the invention meets the requirement of products with different amounts and quality by flexibly adjusting raw oil ratio of two reaction zones, reduces operating severity of a hydro-upgrading reaction zone and prolongs the operation cycle at the same time. In addition, the method of the invention simplifies the process flow, can decrease equipment and reduces investment and operation cost. The method is suitable for hydro-processes of various inferior-quality distillate raw materials.

The invention discloses a method for treating organic nitrogen in sewage. The method comprises the following steps of: treating sewage by using a sequencing batch biofilm reactor, decomposing macromolecular organic nitrogen into micromolecular organic nitrogen under the coexistence of anaerobic, anoxic and aerobic conditions, removing the micromolecular organic nitrogen by using the degradation of microbes, and simultaneously removing ammonia nitrogen and nitrate nitrogen through short-cut nitrification and denitrification and anaerobic ammonium oxidation; and treating by using a coagulation-microfiltration method, precipitating to remove bacteria, suspended solids (SS) and other nitrogen-containing substances by adding a coagulant, and removing refractory macromolecular organic nitrogen such as humic acid, fulvic acid and the like through filtration of a hollow fiber microfiltration membrane to reduce the total amount of the organic nitrogen in the sewage. The invention also discloses a device for implementing the treatment method.

The invention discloses a method for restoring micro-scale polluted reservoir water by using situ bio-contact oxidation. The method comprises the following steps: adopting fiber and sponge combined ball-type packings which are independently developed as carriers to perform screening, placing high effective strain which is obtained through screening in culture solution 'HS enrichment medium' to perform enrichment culture, then inoculating the strain which is through the enrichment culture in 'HSK culture medium' to perform expending cultivation and prepare biological microbial inoculum, placing packings in the microbial inoculum to perform biofilm formation and obtain biological immobilized packings; connecting the prepared biological immobilized packings with a string to fix the packings around the laboratory patented device water-lifting aerator of the invention and adopting water-lifting aeration-situ bio-contact oxidation to perform bioremediation to the micro-scale polluted reservoir water. The method of the invention can be used to effectively reduce the concentrations of COD, N, P and other pollutants in reservoir water and especially effectively lower the total nitrogen content of the micro-scale polluted reservoir water so as to fundamentally resolve the pollution problem of reservoir water, inhibit the growth of algae and control water eutrophication.

The invention discloses a method for controlling nitrogen content in steel by semi-steel smelting. According to the invention, the method for controlling nitrogen content in steel by semi-steel smelting comprises the following steps of: performing oxygen top blowing by using a converter, performing slag-modifying treatment before tapping, and blocking the slag and tapping. In addition, according to the requirements steel on nitrogen content, different bottom-blowing modes are adopted in the oxygen top blowing process by converter, a foaming agent is added at the last stage of blowing, argon gas is blown to ladles 1 to 3 minutes before tapping, and the soft argon blowing operation is performed on ladles during the tapping step. By adoption of the method provided by the invention, the nitrogen content in steel at the converter end-point can be controlled to be within 11 ppm and the nitrogen increase can be controlled to be between 1ppm to 3 ppm during the tapping step. The method provided by the invention can effectively reduce the nitrogen content at the converter end-point and the nitrogen increase in the tapping step, thereby providing a technical support for the production of low-nitrogen steel and ultra-low nitrogen steel.

The present invention provides a method of treating biomass that reduces water-polluting substances, suppresses the production of malodorous gases and greenhouse gases, decreases the nitrogen content in the compost or livestock bedding thus prepared, and furthermore, easily treats nitrogen-containing biomass in a short time at high temperature. The present invention also provides compost and livestock bedding produced by the method and a biomass treating agent. The method of treating biomass includes blending, with nitrogen-containing biomass, a Geobacillus microorganism having denitrification capability and a fermentation promoter that promotes the fermentation of the nitrogen-containing biomass by the Geobacillus microorganism.

The invention relates to a gasification system of an oxygen-enriched biomass circulating fluidized-bed. Biomass is fed from the middle-lower part of a gasification furnace, oxygen-enriched air preheated by a preheater and overheated water steam are fed from the bottom of the gasification furnace, the biomass is rapidly fluidized under the assistant action of a bed material to generate pyrolysis and gasification reactions, generated high-temperature fuel gas is subjected to gas-solid separation by using a cyclone separator, carbon residues in the fuel gas and the bed material are fed to the gasification furnace from the lower part of the gasification furnace by a material return device to continuously react, and the high-temperature fuel gas passes through a cyclone dust collector, a superheater, a waste heat boiler and the preheater in sequence and is then separated from the system. According to the gasification system, the volume fraction as well as the dust and tar concentration in the fuel gas can be effectively reduced, the heat value of the fuel gas is increased, and the high-quality clean fuel gas is obtained.

A method and an apparatus for producing a quartz glass crucible for pulling up a silicon single crystal capable of effectively reducing the content of bubbles by reducing the bubble diameters of the outer layer of the crucible are proposed. The method comprises the method step that during heat-melting of a porous outer molding a processing gas is supplied for flowing through the porous molding, whereby the processing gas preferably contains less nitrogen than air or less oxygen than air.

The systems and methods described provide for reducing sludge generation, and thus sludge wasting and handling, by including an anaerobic completely stirred tank reactor (CSTR) as a bioreactor in a side-stream. The CSTR provides a significant simplification of side-stream treatment design, enhanced sludge minimization, and enhanced removal of nitrogen and phosphorous without the need to add organic carbon. The described systems and methods provide generation of biogas including both hydrogen and methane from the activated sludge system. The described systems and methods avoid complex reactor designs for nutrient removal.

A carrier of hydrocatalyst for the hydrocracking of heavy oil, hydromodifying of poor diesel oil, etc is prepared from amorphour silicon aluminium, modified beta-molecular sieve and aluminium oxide. Its preparing process is also disclosed. Said catalyst has high catalytic activity.

The invention discloses a combined process for delayed coking and hydrotreating, which comprises the following steps that: a coking raw material is heated to enter a coking tower to react, oil gas escapes from the top of the coking tower, gas components and liquid components are separated, and the cycle ratio in a coking process is 0; and the liquid components are mixed with hydrogen to react in ahydrogenation reactor, then the obtained hydrogenated reaction effluent is distilled to obtain hydrogenated naphtha, hydrogenated diesel oil and hydrogenated wax oil, and the hydrogenated wax oil used as a high-quality raw material is fed into a catalytic cracking device or a hydrocracking device. By adopting the process flow of zero circulation of a coking device, the method provided by the invention furthest improves the yield of a liquid product, improves the processing depth of heavy oil, saves a coking fractionating tower, and achieves the aims of optimizing the flow and reducing the investment; and by adopting reasonable graduation of a hydrogenation catalyst, the method can furthest take account of the running period and the refining depth of each coking product fraction.

The invention discloses a distributed domestic sewage treatment method. The method combines process units of anaerobic, jet oxygenation, biological oxidation, artificial wetland and the like together to perform anaerobic, aerobic and wetland ecological three-stage treatment on the domestic sewage so as to effectively reduce CODcr and BOD5 of the domestic sewage; and dephosphorization and denitrification are performed, and the effluent is stable and reaches the standards before emitting. A jet oxygenation pulse water distributor is adopted in the jet oxygenation, and the jet oxygenation pulse water distributor oxygenates the anaerobic effluent and provides pre-oxygenation treatment for a subsequent aerobic process; the biological oxidation is performed in a trickling filtration tower which is designed with 2 to 3 layers and provided with vent holes, a ceramic filler is placed in the trickling filtration tower, and the trickling filtration tower distributes water by adopting time control pulse so that the re-oxygenation effect of the trickling filtration tower can be improved and no power is consumed; and the artificial wetland is designed in an undercurrent form, proper fillers such as coal cinder, plaster, gravels and the like are placed in the artificial wetland, and pollutants can be further degraded and removed from the wetland environment. The method is suitable for standard-reaching treatment of rural or urban distributed domestic sewage.