28results about How to "Reduce solid waste" patented technology

The utility model discloses a polypropylene granulation unit additive feeding powder closed recovery system, which is characterized by comprising a breathing stock bin, an anti-static filter for filtering powder in ascending air flow is arranged in the breathing stock bin, the breathing stock bin is connected with a recovery tank through a pipeline, and the recovery tank is connected with the breathing stock bin through a pipeline. The recovery tank is communicated with an inlet line of a granulator hopper, so that recovered powder and powder fed into the granulator hopper by the system are synchronously processed and granulated; the breathing stock bin and the anti-static filter in the breathing stock bin are arranged, dust and powder brought out by rising hot airflow in the balance pipe and rising airflow of the breathing stock bin are filtered and recycled, the recycled powder is concentrated in the recycling tank, pollution can be controlled, cost and consumption can be reduced, and solid waste is reduced.

The invention relates to a method for extracting succinic acid from succinate fermentation liquor by using a resin and membrane method, and belongs to the technical field of biochemical engineering. The method comprises the following steps: by taking fermentation liquor added with magnesium carbonate as a neutralizing agent as a preparation raw material, separating by using an inorganic membrane to remove insoluble substances and macromolecular proteins, then carrying out decoloration and concentration treatment by using an organic membrane, then converting magnesium succinate into sodium succinate by using resin, and carrying out evaporative crystallization treatment on the obtained sodium succinate and a small part of succinic acid, thereby obtaining the magnesium succinate sodium succinate. Carrying out sodium removal treatment on the evaporation mother liquor by adopting a bipolar membrane, and continuously carrying out evaporative crystallization on the obtained original chamber liquid to obtain the high-purity succinic acid crystal. The production of solid waste and the adsorption of succinic acid by activated carbon are avoided, not only is the extraction rate improved, but also the follow-up treatment water quantity is reduced, the continuous ion exchange device realizes the continuity of adsorption and desorption of succinate, part of succinic acid can be separated out in advance through evaporative crystallization, follow-up evaporation mother liquor enters a bipolar membrane, and the treatment capacity of the bipolar membrane is reduced.

The invention discloses a preparation method of combbutrol calcium and an intermediate thereof, and relates to the technical field of medicines. Comprising the following steps: dissolving a compound 2 in water, carrying out reduced pressure distillation, and stopping distillation until the pH value of a residue is 5.5-6.5; mixing the residues with water, adding cationic resin, stirring, filtering, and collecting mother liquor to obtain a solution containing a compound 3; and mixing the solution containing the compound 3 with calcium carbonate, reacting, cooling, carrying out reduced pressure distillation, adding a solvent into residues, carrying out heat preservation, cooling and separation to obtain a precipitate, and drying to obtain the combbutrol calcium. According to the method disclosed by the invention, few solid wastes are generated, the intermediate butoxide ammonium salt is free to the combbutrol calcium, and the method can be prepared by a one-pot method, so that the cost is reduced, the process is simplified, and the yield and the purity are high.

The invention provides a method for preparing phosphonitrilic chloride trimer through reaction in an organic phase, and relates to the field of phosphonitrilic chloride trimer. The method for preparing hexachlorocyclotriphosphazene through reaction in the organic phase comprises the following steps: preparing pyridine hydrochloride, preparing a choline chloride / glycerol deep eutectic solvent, synthesizing hexachlorocyclotriphosphazene, and carrying out post-treatment. The method for preparing phosphonitrilic chloride trimer through reaction in the organic phase can effectively solve the problems that the reaction process is not easy to control, the reaction time is long, the reaction efficiency is low, and side reaction is easy to generate to generate a large number of by-products in the existing preparation method of phosphonitrilic chloride trimer, the post-treatment is simplified, and the yield is improved. The yield and the purity of the prepared phosphonitrilic chloride trimer are improved, and the generation of three wastes in the preparation process is reduced.

The invention relates to a preparation method of a sulfur removal adsorbent, in particular to a preparation method of a reproducible low-temperature gas adsorbent for removing hydrogen sulfide, which comprises the following steps: loading a molded molecular sieve and an oxide precursor salt; according to the loading method, the operation process is simple, the active component can be efficiently loaded on the carrier, the loading capacity can be regulated and controlled, the impregnation liquid and the washing liquid can be recycled and efficiently utilized, and the preparation cost of the adsorbent is reduced. The invention also relates to a method for adsorbing hydrogen sulfide by the adsorbent and a method for regenerating the adsorbent after adsorbing hydrogen sulfide. The adsorbent carrier is a molded molecular sieve, and the active component is a transition metal oxide. The hydrogen sulfide adsorbent provided by the invention has high sulfur capacity and good deep desulfurization effect, can be regenerated for multiple times, is mild in operation in the regeneration process, and is used for removing hydrogen sulfide from gases such as blast furnace gas, coke oven gas or fuel gas.

The utility model relates to a waste oil collecting device of a papermaking workshop. The waste oil collecting device comprises a side wall, the bottom plate is in sealing joint with the side wall at the bottom of the side wall, and the bottom plate and the side wall define a fluid collecting space V which is opened upwards; the first outlet is formed in the side wall and adjacent to the bottom plate, a first valve is arranged at the first outlet, and the first outlet is allowed to be selectively controlled to be opened and closed; and the second outlet is arranged above the first outlet, and a second valve is arranged at the second outlet, so that the second outlet can be selectively controlled to be opened and closed.

The invention provides a treatment method of 6-aminocapronitrile synthesis reaction residues from caprolactam, which comprises the following steps: firstly, feeding the 6-aminocapronitrile synthesis reaction residues from caprolactam and fresh water into a stirred tank reactor for primary hydrolysis reaction, and fixing a catalyst on a stirring paddle through a metal wire mesh; then the reaction liquid and ammonia gas enter a multi-section gas-liquid two-phase tower reactor and sequentially pass through reaction sections filled with metal oxides, molecular sieves and solid base catalysts, and deep hydrolysis of polymers, decomposition of aminocaproic acid and ammonolysis of caprolactam are achieved. According to the method, the hydrolysis rate is larger than or equal to 94%, the yield of 6-aminocapronitrile is larger than or equal to 90%, the method has the advantages of being capable of deeply hydrolyzing residues, simple in process and continuous in operation, the problems of insufficient hydrolysis and intermittent operation in the prior art are solved, the solid waste discharge amount in the hexamethylenediamine production process is greatly reduced, cost is reduced, economic benefits are improved, and the method is suitable for industrial production. A guarantee is provided for green, environment-friendly and safe production.

This utility model relates to the field of pharmaceutical and chemical production equipment, and in particular to a modular self-cleaning pharmaceutical synthesis filter, including a treatment box and a collection box. The treatment box has first electric slide rails installed on both its front and rear sides. A first base is slidably connected between the two first electric slide rails, and a filter element is slidably connected inside the first base. A second base is connected to the top of the first base, and a placement rack is slidably connected inside the second base. An activated carbon filter assembly is placed in the placement rack. The bottom of the portion of the first electric slide rail extending out of the treatment box is connected to a sliding frame, and the front and rear sides of the collection box are slidably connected to the sliding frame. Through the coordinated control of the first and second electric slide rails, the first and second bases can be slidably replaced independently. Therefore, only the second base needs to be driven to replace the activated carbon filter assembly, while the filter element is retained for continued use through its self-cleaning function. This breaks the traditional linked replacement mode, extends the filter media life, and reduces operating costs.

The invention relates to a purification and separation method, a purification and separation system and a preparation method of isocyanate. The purification and separation method of isocyanate comprises the following steps: conveying an isocyanate reaction solution to a light component removal tower, and carrying out primary rectification to obtain an isocyanate crude product solution; directly conveying the first crude product liquid to a finished product tower, heating the second crude product liquid for partial gasification, and then conveying the second crude product liquid to the finished product tower for secondary rectification together with the first crude product liquid to obtain heavy components, isocyanate and low-boiling-point substances; heating a part of low-boiling-point substances for partial gasification, and then refluxing the low-boiling-point substances to the light component removal tower; in the processes of the first rectification and the second rectification, the inert medium is used for cleaning the trays in the light component removal tower and the finished product tower. The purification and separation method is simple to operate, the polymer generation rate is low, the yield of isocyanate is increased, meanwhile, solid waste is reduced, online self-cleaning is achieved, blockage of all equipment in the rectification process can be effectively avoided, the operation stability of the whole purification and separation system is guaranteed, and the operation cycle of the purification and separation system is greatly prolonged.

The invention relates to the technical field of building materials, and discloses a construction method for manufacturing a PHC pipe pile by replacing cement with pipe pile residual slurry, which comprises the following steps: step 1, preparing raw materials: weighing S105 mineral powder, silica fume, cement, water, sand, stone and a water reducing agent according to a formula proportion; 2, cement and water accounting for 1 / 3 of the formula proportion are put into a concrete mixer to be stirred, after a hydration reaction is conducted for 2-2.5 min, the S105 mineral powder, the silica fume and water accounting for 2 / 3 of the formula proportion are added to be evenly stirred, and then a chemical reaction is conducted for 3-5 min; 3, after the reaction in the step 2 is completed, the water reducing agent, the sand and the stone are added into a concrete mixer and mixed to be uniform, and then the pipe pile residual slurry is prepared, the high-strength concrete prepared from the S105 mineral powder, the silica fume, the cement, the water, the sand, the stone and the water reducing agent replaces cement concrete of a traditional formula, the same construction performance and mechanical performance are achieved, and the construction cost is reduced. The mineral powder and the silica fume belong to solid waste materials, solid waste can be reduced, and low carbon and environmental protection are achieved.

The invention discloses a method and equipment for processing and producing second-class base oil by taking first-class base oil regenerated by waste lubricating oil as a raw material, and belongs to the technical field of regenerated lubricating oil. Atmospheric and vacuum distillation is combined with NMP solvent refining, and the waste lubricating oil is regenerated into qualified first-class base oil to serve as an exclusive raw material; preheating the raw material to 60-80 DEG C under the protection of nitrogen, and introducing the preheated raw material into an adsorption column at a flow rate of 0.5-2.0 BV / h, so that the raw material sequentially passes through a macroporous silica gel layer (the particle size is 0.1-1.5 mm) and an active white clay layer (the mass ratio of the macroporous silica gel layer to the active white clay layer is 2: 1) with specific parameters, and deep synergistic adsorption refining is carried out; after the refined oil enters a storage tank, vacuum is applied to suck residual oil in the column into the tank, and second-class base oil is obtained after heat preservation sedimentation and precise filtration. Under the mild non-hydrogenation condition, high added value upgrading of the waste lubricating oil is achieved, and the method has the comprehensive advantages of being efficient in process, high in product yield, stable in quality and low in energy consumption and cost.

The invention discloses a photodegradation catalyst prepared from a saccharide hydrolysis by-product humate and a method and application thereof, carbohydrates are used as raw materials, the carbohydrates are mixed in a water / organic two-phase system of an acidic catalyst, a promoter, water and an organic solvent, the mixture is heated to a certain temperature to react for a period of time, a humins carrier crude product is obtained after treatment, and the humins carrier crude product is subjected to post-treatment to obtain the photodegradation catalyst. And then uniformly dispersing the humins carrier crude product and a metal oxide or a non-metal oxide in water in a high-temperature and high-pressure reaction kettle, heating and keeping for a period of time, and washing and drying the recovered solid after the reaction is finished to obtain the humins-based photodegradation catalyst. According to the method disclosed by the invention, the organic dye is degraded by adopting a method of combining a saccharide hydrolysis byproduct humins and a photocatalysis technology, the catalytic reaction is relatively efficient, and the energy utilization rate is high; meanwhile, after the photocatalyst is circulated for multiple times, the catalytic effect is slightly reduced, and a new way is provided for reducing solid waste generated by biomass conversion and efficiently degrading water pollutants.

The application discloses a system and process for removing perfluorooctanoic acid by integrating coagulation sedimentation and modified activated carbon adsorption, and belongs to the technical field of water pollution treatment. The system comprises a container frame, a support frame is arranged on the upper portion of the container frame, an adjusting tank, a coagulation sedimentation tank and a modified activated carbon adsorption tank are sequentially arranged on the bottom of the container frame in the transverse direction and are communicated through pipelines, a first booster pump and an electromagnetic flowmeter are arranged on the pipeline between the adjusting tank and the coagulation sedimentation tank, a second booster pump is arranged on the pipeline between the coagulation sedimentation tank and the modified activated carbon adsorption tank, and the backwashing water outlet of the modified activated carbon adsorption tank and the water inlet of the coagulation sedimentation tank are communicated through a backwashing water return pipeline. The application adopts integrated and modular design and is provided with a closed loop return system, so that the removal rate of PFOA in wastewater can be effectively improved, and the problems of limited activated carbon adsorption capacity and difficult treatment of backwashing wastewater are solved.

The invention provides a wet-type centrifugal dust removal device for leather spraying waste gas. The wet-type centrifugal dust removal device comprises a shell, a pre-wetting dust removal cavity arranged on the lower side of the shell and a circulating water tank arranged on the lower side of the pre-wetting dust removal cavity. An air inlet is formed in the pre-wetting dust removal cavity; a driving motor is fixedly arranged on the upper side of the pre-wetting dust removal cavity, and a centrifugal rotating wheel is arranged on the lower side of the driving motor; a negative pressure fan is arranged on the upper side of the shell; an atomization spraying device is arranged in the pre-wetting dust removal cavity; the centrifugal rotating wheel is arranged above the atomization spraying device, the atomization spraying device comprises a first spraying pipe arranged in the pre-wetting dust removal cavity and a first spraying water pump communicated with the first spraying pipe, and a water inlet of the first spraying water pump is communicated with the circulating water tank; an atomizing nozzle is arranged on the first spraying pipe; the device has the characteristics of high dust removal efficiency, simple structure and capability of reducing the subsequent filtering dust removal pressure.

The invention provides a method for preparing iron phosphate from phosphorus and potassium ores and comprehensively utilizing resources, and belongs to the crossing field of hydrometallurgy and chemical engineering, the method comprises the following steps: S1, slowly adding a hydrochloric acid solution into the phosphorus and potassium ores and iron powder, carrying out solid-liquid separation after the reaction is ended to obtain a leaching solution and acid leaching tailings, and using the acid leaching tailings for preparing a potassium fertilizer; s2, hydrogen peroxide is added into the leachate in the step S1 to oxidize Fe < 2 + >, then ammonium carbonate is added, the pH of the solution is adjusted to 1.5-2.0, crude iron phosphate dihydrate and primary precipitation mother liquor are obtained, the crude iron phosphate dihydrate is washed, dried and calcined, and battery-grade iron phosphate is obtained; s3, ammonium carbonate continues to be added into the primary precipitation mother liquor in the S2, the pH is adjusted to 7.0-7.5, crude CaCO3 and secondary precipitation mother liquor are obtained, and the crude CaCO3 is washed and dried to obtain a calcium carbonate product; and S4, sequentially carrying out evaporation concentration and cooling crystallization on the secondary precipitation mother liquor in S3 to obtain an ammonium chloride product. According to the method, all elements in the phosphorus-potassium ore are comprehensively utilized, and the method has important practical significance for developing and using phosphorus-potassium ore resources.

The invention provides a method for online extraction and purification of organic substances from a mixture, which comprises the following steps: S1, solid-phase extraction of organic substances: inputting a sample solution into a solid-phase extraction column for pre-purification to obtain a pre-purified fraction; s2, judging the purity of the pre-purified fraction, and replacing the solid-phase extraction column according to the purity of the fraction; s3, storing qualified fractions in the pre-purified fractions into an intermediate tank or injecting the qualified fractions into a chromatographic column; s4, performing chromatographic separation and purification on fractions which are qualified in pre-purification in the intermediate tank or the chromatographic column in S3; a sample solution prepared from a non-polar or low-polar solvent passes through a solid-phase extraction column, and a target object is replaced from filler in the solid-phase extraction column by strong retention impurities with the adsorbability higher than that of the target object. According to the method disclosed by the invention, before formal purification, solid-phase extraction and pre-purification are firstly carried out, and full pre-purification is ensured through full-wavelength online detection, so that the filling frequency of a chromatographic column is reduced, the generation of solid wastes is reduced to the greatest extent, and a solvent is saved.

The invention discloses a method for purifying menadione 7 by a novel degradable straw resin, and a menadione 7 product with high purity is obtained by making a degradable straw resin, extracting and purifying menadione. The purification method is as follows: first, a flocculant is added to the fermentation liquid, and the mixture is stirred and mixed evenly, and plate-frame filtration is performed after standing flocculation precipitation, and the filtered fungus residue is dried, crushed, and fungus residue dry powder is obtained; the obtained fungus residue dry powder is extracted with acetone, and the extract is collected and concentrated under reduced pressure to obtain an extract concentrate; the obtained extract concentrate is transferred to a saponification reactor, sodium hydroxide solid is added for saponification reaction, sodium hydroxide is added dropwise until no solid is precipitated, and filtered to obtain a saponified liquid; the obtained saponified liquid is chromatographed with a straw resin, and washed with an acetone aqueous solution after adsorption is completed, and then eluted with acetone, etc. The method has good purification effect, high yield, and the straw resin can be reused; the organic solvents used for adsorption and desorption are all acetone, which has little impact on the environment and is easy to recycle.

The invention relates to the technical field of enamel products, and provides regenerated enamel glaze as well as a preparation method and application thereof. The regenerated enamel glaze comprises enamel waste powder, a suspending agent and a cosolvent, and by taking the mass of the enamel waste powder as a reference, the addition amount of the suspending agent is 5-12%, and the addition amount of the cosolvent is 0.1-3%; the enamel waste powder is generated in an enamel glaze spraying operation process. According to the regenerated enamel glaze, the enamel waste powder is fully utilized, the solid waste treatment cost and the product manufacturing cost are reduced, and the environment is protected. The regenerated enamel glaze provided by the invention can be used for manufacturing enamel products with the acid-resistant standard of A + level, such as inner containers and baking trays of ovens, cooker panels, liquid bearing trays, barbecue oven accessories and the like.

The method comprises the following steps: S1, dissolving 6-bromoisovanillin and 4-hydroxyphenylethylamine in a first reaction solvent, stirring, adding a reducing agent, carrying out a stirring reaction to obtain an intermediate crude product, and purifying to obtain an intermediate pure product; and S2, adding the pure intermediate product into a second reaction solvent containing an oxidizing agent and alkali, carrying out oxidative cyclization to obtain a crude product of the navidine derivative, and purifying to obtain a navidine derivative product. According to the method disclosed by the invention, 6-bromoisovanillin and tyramine are taken as initial raw materials and are subjected to reduction and oxidative cyclization reaction to obtain the bromo-navidine derivative, and the oxidative cyclization yield can reach 72%; according to the method, the oxidation cost is effectively reduced, the oxidizing agent which is good for the environment is adopted, the use of dangerous and toxic reagents is avoided, the generation of industrial three wastes is effectively reduced, the process is simple, the operation is convenient, the raw materials are cheap and easy to obtain, the yield is high, and large-scale industrial production is facilitated.

This utility model discloses a foreign object-proof rice noodle extraction pipe structure, relating to the field of rice noodle processing technology. The utility model includes: a base plate, a flour mill mounted on the upper side of the base plate, a flour hopper mounted on the lower side of the flour mill, a conveying pipe fixedly connected to the lower side of the flour hopper, a cyclone separator mounted at one end of the conveying pipe, a shut-off fan mounted on the lower side of the cyclone separator, and an iron removal box mounted on the lower side of the shut-off fan, with an iron removal mechanism installed inside the iron removal box; a weighing hopper mounted on the upper side of the base plate, and a pneumatic gate valve mounted on the lower side of the weighing hopper. This utility model, by setting up a conveying pipe and a cyclone separator, improves the sealing effect during the conveying of rice noodle materials, preventing foreign object intrusion, preventing rice noodle from scattering and affecting the processing environment, reducing rice noodle loss, increasing yield, and reducing solid waste. The iron removal mechanism adsorbs and collects iron substances in the rice noodle materials, improving the quality of rice noodle processing.

The invention belongs to the technical field of chemical synthesis of medicines, and particularly relates to a synthesis method of an LXH-1211 intermediate. The preparation method comprises the following steps: carrying out stirring reaction on phenylhydrazine, 3-aminocrotonitrile and a reaction solvent to obtain an intermediate IM-1; mixing the intermediate IM-1 and a reaction solvent, cooling, adding phosphorus oxychloride, and heating for reaction to obtain an intermediate IM-2; and dissolving the intermediate IM-2 in a reaction solvent, adding ethyl cyanoacetate, and carrying out a stirring reaction to obtain the LXH-1211 intermediate. The raw materials are easy to obtain, use of highly toxic and explosive materials, column chromatography and other operations are avoided, the yield is remarkably improved, special equipment is not needed, industrial amplification is facilitated, and the environmental protection cost is effectively reduced.

This invention relates to the field of food safety testing technology and discloses a method for determining the residual amounts of amide alcohols and their metabolites in milk. The method involves adding an internal standard to a milk sample, followed by the addition of a composite desorption solvation reagent and shaking to induce the desorption of the target analyte from its protein-bound state into the free aqueous phase. Subsequently, magnetic HLB microparticles are introduced and an external magnetic field is applied to anchor the microparticles to the inner wall of the container for spatial isolation. Under these conditions, low-speed horizontal cross-flow is applied, and a phase transition triggering and cross-flow flocculation reagent is added dropwise to induce flocculation of protein impurities at the center of the system, simultaneously driving the free target analyte phase to transfer to the internal pores of the inner wall microparticles. Finally, after draining the central flocculation waste liquid, matrix washing, and targeted elution, quantitative analysis is performed using liquid chromatography-tandem mass spectrometry. This invention, through the combination of in-situ desorption and cross-flow phase transfer, avoids protein flocculants clogging the extraction channels, achieving simultaneous and efficient enrichment of impurities and target analytes.

The invention discloses spraying equipment for automobile part machining, and belongs to the technical field of automobile part machining, the automobile parts are hubs, the spraying equipment comprises a spraying cabin, a laminar flow air supply module is arranged at the top of the spraying cabin, a negative pressure suction assembly is arranged at the bottom of the spraying cabin, and the spraying cabin is used for forming piston type vertical airflow from top to bottom in the cabin; the over-sprayed paint mist is directionally conveyed to a recovery opening formed in the bottom; the rotating station is arranged in the spraying cabin, comprises a rotary table and a clamping assembly, and is used for clamping and driving the hub to rotate around a vertical shaft; the rotary dry type filtering module comprises a rotatable rotary tower, and a plurality of honeycomb paper boxes are evenly distributed on the rotary tower in the circumferential direction. An adsorption station, a desorption station and a drying regeneration station are sequentially arranged around the rotating tower in the rotating direction; the station isolating and sealing mechanisms are arranged between the adjacent stations and used for keeping sealed isolation between the stations when the rotating tower rotates; and the unification of environmental protection, energy conservation and efficient production can be realized.

The invention discloses a novel method for purifying menadione-7 by degradable straw resin. A menadione-7 product with relatively high purity is obtained by preparing the degradable straw resin, extracting menadione and purifying the menadione-7. The purification method comprises the following steps: firstly, adding a flocculating agent into the fermentation liquor, uniformly stirring and mixing, standing, flocculating and precipitating, then carrying out plate frame filtration, and drying and crushing the filtered mushroom dregs to obtain mushroom dreg dry powder; extracting the obtained mushroom dreg dry powder by using acetone, collecting an extracting solution, and concentrating under reduced pressure to obtain an extracting concentrated solution; transferring the extracted concentrated solution to a saponification reaction kettle, adding sodium hydroxide solid for saponification reaction, dropwise adding sodium hydroxide until no solid is separated out, and filtering to obtain a saponified solution; and carrying out chromatography on the obtained saponification liquid by using straw resin, washing by using an acetone aqueous solution after adsorption is completed, and eluting by using acetone. The method is good in purification effect and high in yield, and the straw resin can be recycled; the used adsorption and desorption organic solvents are acetone, so that the influence on the environment is small, and the recovery is easy.

The invention provides a horizontal light component removal conveying device, a light component removal conveying method, a dichlorobenzene rectification residual liquid recovery device and a dichlorobenzene rectification residual liquid recovery method. The horizontal light component removal conveying device comprises a body, a stirring device and a transmission device, the stirring device is arranged in the body, and the stirring device is connected with the transmission device so as to drive the stirring device to rotate; the stirring device comprises a stirring shaft and stirring blades arranged on the stirring shaft, and the stirring shaft is horizontally arranged; the stirring shaft and the stirring blades are of hollow structures which are communicated with each other; the stirring shaft comprises at least one sub-stirring shaft pair which is arranged in parallel, and two sub-stirring shafts are arranged in the sub-stirring shaft pair; and the stirring blades on the two sub stirring shafts in the sub stirring shaft pair are arranged in a staggered manner. According to the invention, heating, light component removal and conveying of high-viscosity materials such as dichlorobenzene rectification residual liquid can be realized, and the problem that high-viscosity solid wastes are difficult to treat at present is solved.

The invention discloses a method for producing potassium sorbate by liquid-liquid neutralization reaction and continuous cooling crystallization, and belongs to the field of chemical industry. The present invention dissolves sorbic acid in a mixed solvent to obtain a sorbic acid solution, and pumps the sorbic acid solution and potassium hydroxide or potassium carbonate aqueous solution into a neutralization reactor for neutralization reaction to obtain a potassium sorbate solution, and then pumps the potassium sorbate solution into a two-stage crystallization reactor for continuous cooling crystallization, and finally the crystallized tide product potassium sorbate is dried to obtain a potassium sorbate finished product, wherein the mixed solvent is a mixed solvent composed of one or two of ethanol or acetone and water, and the concentration of ethanol or / and acetone is 10%-80%. The present invention dissolves sorbic acid in a solution and reacts liquid-liquid with a potassium hydroxide solution, and the mixing is more uniform and the reaction is easy to control, and the potassium sorbate crystals in the obtained potassium sorbate finished product are regular granular, with a content of ≥99.8% and a transmittance of ≥98.5%.

This invention discloses a synergistic desulfurization and vanadium removal method for high-sulfur and high-vanadium petroleum coke. The method includes the following steps: crushing the high-sulfur and high-vanadium petroleum coke, mixing it with a Fe₂O₃ supported activated carbon catalyst and a NaOH / Na₂CO₃ mixed alkali in a specific ratio, and adding hydrogen peroxide to form a reaction slurry; placing the reaction slurry in a microwave-ultrasonic combined field and performing an oxidation reaction at 70–95°C; after the reaction, solid-liquid separation, washing, drying, and magnetic separation are performed to obtain purified petroleum coke. This invention activates the oxidant with a catalyst under alkaline conditions, making it easier for vanadium in the petroleum coke to undergo oxidation and dissolution, inducing the loosening of the local carbon skeleton structure, thereby promoting the exposure and further oxidation of organic sulfur, achieving synergistic removal of sulfur and vanadium. This method is simple, energy-efficient, allows for magnetic recovery of the catalyst, and enables the recycling of the leachate. It is suitable for the resource utilization of low-quality petroleum coke and has application value in the production of carbon anodes for aluminum electrolysis.

The invention discloses a method for hydrogen recovery and cascade refrigeration carbon dioxide capture in methanol cracking hydrogen production tail gas, and relates to the field of capture and recovery of carbon dioxide in industrial tail gas. The method comprises the following steps: (1) dehydrating and separating; (2) separating and purifying industrial-grade carbon dioxide; (3) separating and purifying food-grade carbon dioxide; and (4) separating and purifying high-purity hydrogen. According to the method, high-content carbon dioxide in the desorbed gas discharged in the methanol cracking hydrogen production process is firstly purified, then low-content hydrogen is purified, the occupied area of equipment is greatly reduced, the equipment investment is low, internal energy of the system is comprehensively utilized, the operation energy consumption of the system is low, the industrial safety is improved, and the method is suitable for industrial production. And meanwhile, industrial-grade and food-grade carbon dioxide and high-purity hydrogen are co-produced, the generated solid waste is less, and the pollution to the environment is greatly reduced.