36results about How to "Simplify the desulfurization process" patented technology

A biological desulfurization process for biogas comprises the following steps: contacting and reacting absorption solution which has a pH value of 7.5 to 8.0 and contains biological desulfurizing bacteria with the biogas first; aerating the reaction solution and keeping the dissolved oxygen concentration of the reaction solution between 0.50 and 1.25 mg/L; transforming sulfur element in the adsorption solution into monomer sulfur; and recycling the absorption solution which is obtained after the settlement separation of the monomer sulfur and maintains the dissolved oxygen concentration of 0.05 to 1.25 mg/L. The process avoids further desulfurization by a dry method or wet method and is simple and convenient to operate.

The invention relates to a method for one-time low-temperature preparation of regenerated rubber, and belongs to the technical field of rubber regeneration. According to the method, vulcanized rubber powder, an auxiliary and a plasticizer are added into a high-shear internal mixer, regenerated rubber sheets are discharged after internal mixing, and the internal mixing temperature is kept at 60-90 DEG C; a double-auger feeding mechanism is connected to the outer end of a feeding port of the internal mixer, and thus the material conveying uniformity and efficiency are improved; four rotors are horizontally arranged in an internal mixing chamber and distributed in a rectangular mode, and thus the material shearing strength, material squeezing strength and material twisting strength are improved by multiple times; since the working end face of an upper ejection bolt and the working end faces of pressing heads are wavy, the physical performance of materials can be improved rapidly, it is guaranteed that the low-temperature kneading process is not affected, and even the operating efficiency of the whole internal mixer is improved. The method for one-time low-temperature preparation of regenerated rubber has the advantage that the external environment is not affected during low-temperature preparation, and the low-temperature internal mixing efficiency and the quality of regenerated rubber can be greatly improved.

The invention discloses a liquid phase oxidation catalyst which is used to desulphurize fire coal flue gas. The invention comprises a surface active agent, M2+1, M3+2 and industrial-grade urea, wherein the mass ratio between the surface active agent and the industrial grade urea is 1:40-1:60, the solution mass concentration ratio between the M2+1and the M3+2 is 10:1-30:1, the mass ratio between the surface active agent and the M2+1 is 1:80-1:90, and M is Mn or Fe or Mg. The oxidative catalyst of the invention is very easy to be dissolved in water, and water solution is weakly-acidic. Density range is 2.75-2.93*103kg.m-3, and physiochemical stability is comparatively good. The invention only has catalytic oxidative effect in the process of flue gas desulphurization and no consumption theoretically, and can be used in circulation. The oxidative catalyst of the invention is adopted to desulphurize the fire coal flue gas, desulphurizing efficiency can be increased, simultaneously a desulphurizing process can be simplified (without an oxidation draught fan process), the operational cost of the flue gas desulphurization can be lowered greatly, and the invention has great practical applicable value and wide applicable foreground.

The invention discloses a compound desulfurization adsorbent and a preparation method thereof. The compound desulfurization adsorbent is prepared from 100 parts by weight of modified mesoporous molecular sieve, 50 to 80 parts by weight of modified microporous molecular sieve, 20 to 30 parts by weight of aluminum oxide and 15 to 30 parts by weight of nitric acid solution. The preparation method comprises the following steps: uniformly mixing the modified mesoporous molecular sieve, the modified microporous molecular sieve, the aluminum oxide and the nitric acid solution, carrying out extrusionforming to obtain particles and curing at the room temperature; drying the cured particles and carrying out high-temperature activated roasting to obtain the compound desulfurization adsorbent. The application also provides application of the compound desulfurization adsorbent in removing sulfide in sulfur-containing substances. The compound desulfurization adsorbent disclosed by the application can effectively remove various sulfides in the sulfur-containing substances and simplifies the desulfurization process; in addition, the preparation method has the advantages of simple preparation process, easiness in raw material obtaining and lower cost.

A method for low temperature desulphurization of a sodium aluminate solution is characterized in that low temperature oxidation desulphurization of the sodium aluminate solution which is a slurry obtained after high temperature dissolve-out of high sulfur bauxite through introducing oxygen in order to remove S<2-> in the sodium aluminate solution. A low temperature oxidation technology is adopted to oxidize the dissolve-out slurry of the high sulfur bauxite, so S<2-> in the sodium aluminate solution can be removed, and the desulfurization rate reaches above 90%. The method has the advantages of low operation temperature, good desulphurization effect, low energy consumption and the like.

The invention discloses composite modified asphalt and a preparation method thereof. The preparation method comprises the following steps: 1, preparing SBS modified asphalt; 2, stirring the SBS modified asphalt at the temperature of 300r/min to 400r/min, adding the RVS/PTC-R activated rubber powder, raising the temperature to 165 DEG C to 175 DEG C within 5min after the SBS modified asphalt is added, and keeping the temperature for 20min to 30min; 3, shearing a product obtained in the step 2, gradually increasing the shearing rate to 4000 r/min to 4500 r/min, controlling the temperature to be 180 DEG C to 190 DEG C, conducting shearing for 45 min to 60 min, and taking out a sheared product; and 4, developing the product obtained in the step 3 at the temperature of 175-185 DEG C for 30-40 minutes to obtain the composite modified asphalt. The composite modified asphalt has good high and low temperature performance, and also has excellent storage stability and construction workability.

The invention discloses a method for preparing a desulfurizer from coal cinder, which comprises the following steps: firstly, placing the coal cinder into a soaking pool, and filling soaking water for soaking; and secondly, detecting the pH value of a soak solution after soaking in the soaking water, and generating the desulfurizer which can be directly poured on coal to be combusted when the detected pH value reaches more than 12. By adoption of the method to prepare the fuel coal desulfurizer, not only the coal cinder generated by coal combustion in various coal combustion yards can be fully utilized but also the prepared desulfurizer has strong desulfurization effect on flue gas generated by coal combustion, realizes reutilization of waste coal cinder, saves the desulfurization cost, reduces resource waste, and simultaneously can also simplify the desulfurization technology and reduce the cost of the desulfurizer and equipment.

The invention discloses a method for eliminating sulfur dioxide in sulfited semi-finished fruits. The method comprises the following steps: S1, the sulfited semi-finished fruits are washed; S2, the sulfited semi-finished fruits are soaked in a citric acid solution under a heating condition; S3, the sulfited semi-finished fruits are bleached; S4, the sulfited semi-finished fruits are drained. The desulfurization process for sulfited semi-finished fruit raw materials of Cantonese preserved fruits has a good desulfurization effect, and the removal rate of residual sulfur in the semi-finished fruits is up to 88.59% and meets the national standard. Besides, the adopted citric acid solution is an ingredient of a color protection solution used in the early processing period of Cantonese preserved fruit and candied fruit products, has no influence on the semi-finished fruit raw materials, has a color protection effect on the semi-finished fruit raw materials and products and can reduce the sizes of the raw materials, improve the transparency and improve the appearance of the raw materials, the appearance of the desulfurized semi-finished fruits is good, and the boiling fastness of the semi-finished fruits is improved. Besides, the desulfurization process is simple and convenient, the desulfurization speed is high, desulfurization can be finished within 15-20 min, the cost is low, and the method has great significance in production and popularization of Cantonese preserved fruits.

The invention provides a graphene-based desulfurization catalyst, a preparation method thereof and a desulfurization method of low-carbon alkane catalytic dehydrogenation byproduct hydrogen, and the graphene-based desulfurization catalyst comprises 5-55 wt% of graphene and 45-95 wt% of a molecular sieve based on the total weight of 100%. According to the desulfurization method, the activated graphene-based desulfurization catalyst is used for carrying out catalytic desulfurization treatment on the low-carbon alkane catalytic dehydrogenation byproduct hydrogen so as to remove sulfides in the hydrogen. According to the method provided by the invention, inorganic sulfur and organic sulfide in hydrogen can be removed at the same time, the desulfurization process of catalytic dehydrogenation byproduct hydrogen can be simplified, and the desulfurization efficiency of the desulfurizer is effectively improved. Besides, the graphene-based desulfurization catalyst provided by the invention only uses graphene as an active component, and any auxiliary agent does not need to be added, so that the harm to downstream catalyst components caused by the auxiliary agent introduced into the desulfurization agent can be avoided.

The invention relates to a carbothermy-based hot metal pretreatment in-situ desulphurization method for magnesite-based desulfurizers. According to the method, metal magnesium steam obtained through reduction of magnesite is directly subjected to hot metal pretreatment desulphurization without condensation, so that energy is saved, environment is protected, and cost is reduced; the magnesite-based desulfurizers are fed into hot metal with the temperature of 1400-1500 DEG C for desulphurization, the weight ratio of the magnesite-based desulfurizers to pig iron is 1:10, and magnesium steam, generated through reduction of magnesium oxide and carbon in the magnesite-based desulfurizers, desulfurizes the hot metal directly. The carbothermy-based hot metal pretreatment in-situ desulphurization method has the advantages that the magnesite, extensive in source and low in cost, is utilized, so that high-quality and high-purity magnesium powder is saved, and process is simplified.

The invention discloses a difunctional hydroxyl iron oxide desulphurization agent and a preparation method thereof. The method adopts ferrite and sodium metaaluminate as raw materials to have homogenous co-precipitation reaction, the one-step synthesis is performed in a co-precipitation method, impurities are removed in a separation manner, then by virtue of a series of steps such as half drying,addition of adhesive, mixing pre-extrusion, extrusion molding and drying, the difunctional hydroxyl iron oxide desulphurization agent is finally obtained. By adopting the desulphurization agent, the hydrogen sulfide and carbonyl sulfide can be removed, and the desulphurization agent is excellent in performance under the saturated sulfur capacity and regeneration test. The preparation method is simple in preparation process, stable in product, capable of simplifying the procedures, and capable of effectively reducing the equipment investment, so that the difunctional hydroxyl iron oxide desulphurization agent is good in industrial application potential.

The invention provides a sulfur recovery method for treating acid gas, characterized by comprising a tail gas purification treatment stage, wherein Claus tail gas is cooled to 130 to 140 DEG C througha third-stage condenser; separated process gas enters a sulfur mist trap, and liquid sulfur is further collected; the process gas that comes out of the sulfur mist trap is heated by a third-stage reheater and then enters a hydrogenation reactor for hydrogenation hydrolysis reaction; the process gas which comes out of the hydrogenation reactor is condensed and cooled by a fourth-stage condenser, and then enters a selective oxidation reactor; the process gas which comes out of an outlet of the selective oxidation reactor enters a fifth-stage condenser and is cooled to 130 to 140 DEG C; the process gas which comes out of the fifth-stage condenser enters a complex iron ion solution. purified tail gas which comes out of the complex iron ion solution is introduced into an incinerator to be incinerated and emptied. The sulfur recovery method is efficient, energy-saving and economical, and not only improves the sulfur production rate, but also minimizes the SO2 emission concentration.

The invention provides a desulfurization method of a gas storage tank system. The method comprises a dehydration step, a desulfurization step and a detection step, wherein in the dehydration step, biogas is introduced into a dehydration device for dehydration and drying before biogas desulfurization operation, the dehydrated and dried biogas is desulfurized by a desulfurization device; the desulfurization device is filled with a desulfurizing agent, the content of hydrogen sulfide in biogas output from an outlet of the desulfurization device is detected, the desulfurization effect of the desulfurizing agent in the desulfurization tank can be known in time by detecting the content of hydrogen sulfide in biogas, an overhaul plan can be made in time when the desulfurization effect is reduced,and the environment is effectively protected. An iron oxide dry desulfurization process is adopted for biogas desulfurization, the content of hydrogen sulfide in biogas desulfurized by a desulfurization tank can be controlled to be below 100 ppm, the desulfurization effect is good, the biogas quality is stable, the desulfurization process is simple, the number of devices is small, operation is convenient, the desulfurizer cost is low, and the cost advantage is obvious.

A bimetallic FMG desulfurizer for wet oxidation desulfurization is prepared from the following raw materials in parts by weight: ferrous salt, manganese salt, an organic complexing agent, metal corrole, anthraquinone-2,7-disulfonic acid, polyethylene glycol, an absorbent, a stabilizer, a settling agent, a corrosion inhibitor and a proper amount of water. Bimetal manganese, iron ions and the like are adopted as central ions, a metal corrole complex, anthraquinone-2,7-disulfonic acid, an organic complexing agent and the like are adopted as ligands, inner and outer layer coordination is combined with a supergravity technology through weak interaction to form a supramolecular complex, hydrogen and oxygen in the inner and outer layers form hydrogen bonds, the working sulfur capacity is high, the performance of the desulfurizing agent is stable, and oxidation regeneration is good. Moreover, the desulfurization efficiency is high, the catalytic reaction selectivity is good, secondary salt is not accumulated, and thiosulfate is not generated. In addition, the utilization rate of oxygen in the regeneration process can be increased, the air consumption is reduced, the regeneration rate is increased, the energy consumption of a fan in the regeneration process is reduced, and the cost is low.