60results about How to "Improve processing economy" patented technology

The invention relates to the field of caprolactam production, and discloses a caprolactam refining method. The method comprises the following steps: (1) reduced pressure distillation is carried out ona caprolactam crude product containing impurities with a boiling point higher than the boiling point of caprolactam and impurities with a boiling point lower than the boiling point of caprolactam, sothat impurities with the boiling point lower than he boiling point of caprolactam is removed, and a light removed product is obtained; (2) the light removed product is mixed with a crystallization solvent, and then crystallizing is carried out to obtain a crystal; and (3) a hydrogenation reaction is carried out on the crystal, wherein the reduced pressure distillation is carried out under a condition of variable temperature and variable pressure, and the mass ratio of the crystallization solvent to the light removed product is (0.2-5):1. Premium-grade caprolactam can be obtained through the method provided by the invention, a heavy removal step is omitted, the process flow is simple, and the method is easy for industrial implementation.

The invention discloses a pretreatment method for cathode deposition of molten salt electrorefining. The method comprises the following steps of: breaking and ball-milling the cathode deposition in an inert gas shielding environment to obtain a mixture of metal powder and electrolyte powder, wherein the granularity of the mixture is 44-150 microns; and pneumatically separating the mixture powder through airflow so as to separate the metal powder and the electrolyte powder. The pretreatment method disclosed by the invention has the advantages that the separation of the electrolyte and the metal powder is achieved so as to effectively reduce the electrolyte content of the cathode deposition; and the dosage of diluted acid and the frequency of clean water washing in a wet treatment process can be reduced so as to improve process economical efficiency and reduce environment pressure.

The invention relates to a method for the catalytic hydrocracking of phenol-containing tar to recycle diphenol, and a catalyst used for the method. The method takes cesium salt modified titanium dioxide supported with palladium and silver as the catalyst, and takes phenol-containing tar as a reaction raw material to perform direct catalytic hydrogenation to directly synthetize catechol/hydroquinone in an ethanol solvent. The method is simple in operation, green and environmentally friendly; the method can perform recycling on hydroquinone products remained in the phenol-containing tar, and canperform re-hydrocracking on the tar generated by phenol dimerization and deep oxidation so that diphenol products with high added values can be obtained, and therefore, treatment costs of solid wastecan be reduced, and the yield of the diphenol products can be significantly enhanced.

The invention belongs to the field of biomass energy, and particularly relates to a method for preparing synthesis gas by biomass pyrolysis gasification coupling and a system adopted by the method. The method comprises the following steps of (1) feeding a biomass raw material into a microwave pyrolysis reactor for reaction to obtain a pyrolysis volatile component and a pyrolysis solid-phase material, (2) feeding the pyrolysis solid-phase material into a gasification reactor to be in contact with an activating agent for gasification reaction, so as to obtain crude synthesis gas and biochar, (3)converging the pyrolysis volatile component and the crude synthesis gas, and feeding into a gas reforming converter from one direction, and feeding the biochar into a gas reforming converter from another direction to prepare a target product. The system comprises a biomass bin (1), a microwave pyrolysis reactor (2), a gasification reactor (3), a gas reforming converter (8) and a gas-solid separator (12). The method is beneficial to gas-solid two-phase sufficient reaction, the process cost of preparing the synthesis gas from the biomass can be remarkably reduced, and the target product qualityis high.

The invention discloses a combined system and method for processing oil gas generated by pyrolysis of low rank coal. The system comprises a quench cooler, a normal pressure distillation column, a suspended bed hydrogenation reactor, a gas-liquid separator, a vacuum distillation tower, a residuum gasifying device, a gas separation and purification device, and a glycol synthesis system. The method comprises the following steps: quenching pyrolysis oil gas to generate cooled oil gas; subjecting cooled oil gas to normal pressure distillation to obtain heavy oil in the bottom of a distillation column and light fuel; cracking the heavy oil, separating gas and liquid to obtained cracked oil; subjecting cracked oil to vacuum distillation to obtain residual oil; gasifying the residual oil to obtain syngas; separating and purifying syngas to obtain hydrogen and carbon monoxide; and synthesizing carbon monoxide and hydrogen to obtain glycol. After vacuum deep extraction, the heavy residual oil is not returned to the suspended bed hydrogenation reactor, and thus the coking during the hydrogenation process in the suspended bed is avoided. The gas prepared from residual oil is used to produce glycol, the flexibility of heavy component processing is improved, and the economy of the technology is increased.

The invention provides a multi-stage reactive distillation synthesis technique and device of PODEn (polyoxymethylene dimethyl ethers). According to the technique, industrial methanol and a formaldehyde solution are taken as raw materials, a methylal reactive distillation column and a PODEn reactive distillation column are combined in one set of equipment, two reaction processes are combined by sufficient use of advantages of the reactive distillation columns and equipment coupling advantages, the reaction conversion rate and the target product yield are effectively increased, the circular stream flow is reduced, and the equipment efficiency is improved. According to the technique, the cost of used raw materials is low, the reaction process is controllable, the investment and the cost are low, no other substances are introduced, the process is environmentally friendly, and the technique has good application prospects.

The invention provides a molten salt electrolytic refining method and a method for recovering and treating cathode deposition thereof. The recovering and treating method comprises the following steps: putting the cathode deposition in a dilute acid solution having the acid concentration not lower than 0.01mol/L for extraction to obtain an extract solution; continuously carrying out extraction to obtain a saturated extract solution; adjusting the pH value of the saturated extract solution to form a precipitate; filtering to obtain a settled solution; carrying out crystallization treatment to obtain electrolyte crystals. The refining method comprises the following step: treating the cathode deposition containing the target product by using the recovering and treating method. The method for recovering and treating cathode deposition provided by the invention has the beneficial effects that the electrolyte entrained in the cathode deposition of molten salt electrolytic refining can be separated and recovered without affecting the after treatment process effect of the cathode deposition, and the method is low in recovery energy consumption, good in process economical efficiency and low in environment stress.

The invention discloses a method for treating waste generated during pesticide intermediate production. The waste generated during pesticide intermediate production is treated by the aid of acid adding reaction processes, and accordingly sulfur-containing substances in the waste can be completely transformed; sulfur and byproducts can be recycled by the aid of filter and solvent-out crystallization processes. The method includes operation of reaction, absorption, filter, solvent-out crystallization, distillation, liquid and solid separation and the like. The method has the advantages of low cost, high efficiency, environmental protection and energy conservation. Besides, the sulfur and the byproducts can be recycled, accordingly, environmental protection requirements can be met, and economic benefits can be increased.

The invention relates to a device and a method for continuously isomerizing epoxide, which can be used for continuous isomerizing preparation of corresponding allyl alcohol products from epoxide. Themethod comprises steps as follows: reaction raw materials and carrier gas are preheated to certain temperature, the raw materials are contacted with a regenerated catalyst and a newly supplemented catalyst in a fluidized state in a fluidized bed reactor at a certain air speed, an isomerization reaction is performed under certain pressure, reaction gas and a carbon deposit catalyst are obtained through separation in a settler, wherein reaction gas rises and enters a product separation system via a reaction liquid pipeline at the top of the settler, the carbon deposit catalyst enters a regenerator for regeneration, and the regenerated catalyst returns to a lifting pipe reactor via a regenerated catalyst pipeline. The process has the characteristics of high atom economy, product yield and selectivity and no pollution and is notably superior to a current slurry bed process.

The invention discloses a biomass microwave pyrolysis gasification method and system. The method comprises the following steps: preheating a biomass raw material, and feeding the preheated biomass rawmaterial into a microwave pyrolysis reactor for oxidative pyrolysis reaction; feeding a pyrolysis product into a microwave cracking reactor for cracking reaction, thus obtaining cracking crude synthesis gas and a solid-phase material after the reaction; feeding the solid-phase material into a biochar microwave gasification reactor for reaction, thus obtaining gasified crude synthesis gas and activated carbon; feeding cracked crude synthesis gas and gasified crude synthesis gas into a raw material preheating tank to preheat a biomass raw material, performing gas-solid separation on the crude synthesis gas subjected to heat exchange, and feeding a gas-phase material obtained after gas-solid separation to a purification reactor, and treating the gas-phase material through a membrane filter in the purification reactor to obtain purified synthesis gas. According to the biomass microwave pyrolysis gasification method and system, the yield of the synthesis gas can be increased, the tar content in the obtained synthesis gas product is low, and meanwhile, a high-quality activated carbon product is co-produced.

The invention discloses a purification device for traditional Chinese medicine production and processing, and belongs to the field of traditional Chinese medicine processing. The invention discloses apurification device for traditional Chinese medicine production. The device comprises a tank body, a bottom frame, a stirring mechanism, a discharging square pipe, a switching mechanism, an electriccontrol box, a liquid injection mechanism, a filtering mechanism and a discharging port; a bottom frame is fixed to the bottom of the tank body, a discharging port is formed in the center of the bottom face of the tank body, a discharging square pipe communicated with the discharging port is fixed to the bottom face of the tank body, a filtering mechanism is placed on the inner side of the end ofthe discharging square pipe, a switching mechanism is installed at the end, close to the tank body, of the discharging square pipe, and a liquid injection mechanism is installed on the outer wall of the tank body. Traditional Chinese medicine solvents are fully mixed through the stirring mechanism, the purification efficiency and precision are improved, adjustable quantitative solvent adding is achieved through the liquid injection mechanism, solvent waste is reduced on the premise that medicine components are fully absorbed, and the processing economy is improved.

The invention discloses a semi-aqueous cleaning composition and a preparation method and application thereof. The composition comprises 5-20% of a permeation solvent, 1-5% of surface active peptide, 2-10% of sophorolipid, 1-5% of NaOH, 1-5% of sodium carbonate, 3-8% of sodium metasilicate, 2-15% of N, N-diethylhydroxylamine and water. The osmotic solvent is one or two of aldehyde condensation 2, 3-butanediol and ketone condensation 2, 3-butanediol, and the osmotic solvent is one or two of aldehyde condensation 2, 3-butanediol and ketone condensation 2, 3-butanediol; the mold cleaning agent for resin lens production, provided by the invention, has small damage to a mold, has a good removal effect on residual adhesives, resin monomers and resin solids at the edge of the mold, and effectively improves the qualified rate of resin lens production. Meanwhile, the cleaning agent provided by the invention has the characteristics of thorough oil removal, dust removal, surface residual fiber removal and the like, and the qualified rate of resin lens coating is effectively improved.

The invention relates to the field of hydrogen peroxide preparation, and discloses a zero-emission oxidation device and method for producing hydrogen peroxide by an anthraquinone method. The oxidationdevice comprises an oxidation tower (4) and an oxidation liquid receiving tank (7), wherein the oxidation tower (4) supplies oxygen-enriched gas through a gas supply unit (3), introduces hydrogenation liquid through a hydrogenation liquid inlet (1), and is used for carrying out an oxidation reaction on the hydrogenation liquid and the oxygen-enriched gas to obtain oxidation liquid containing hydrogen peroxide, leading out the oxidation liquid through an oxidation liquid leading-out pipe (6) and storing the oxidation liquid in the oxidation liquid receiving tank (7). The device and the methodhave good safety, can ensure safe and stable operation of the device, and reasonably utilize oxygen generated by decomposition of hydrogen peroxide in the oxidation liquid receiving tank.

The invention provides a method for synthesizing benzimidazole and its derivative. The synthesis of polyfunctional benzimidazole and 2-substituted benzimidazole is achieved by imidazole chloride catalyzed o-phenylenediamine cyclization. The method is simple and economical and strong in practicability. No catalyst or additive is added. The synthesis method has good functional group tolerance, excellent yield and purity and short reaction time, does not require harsh reaction conditions and is suitable for industrial production.

The invention relates to a combined electrolytic machining tool cathode and method, and belongs to the field of electrolytic machining. The tool cathode comprises a knife handle, an insulating block,a current-conducting plate, an electricity leading screw and a fastening screw. The combined electrolytic machining tool cathode aims to solve the problems of stray corrosion, poor flatness of bottomsurface and the like generated when a rod-shaped cathode tool is used for machining a groove. The current-conducting plate with the thickness smaller than 1 mm is used, and a current-conducting area between a cutter and a machined surface is limited. Compared with a previous circular current-conducting area, the bottom current-conducting area is greatly reduced, electric quantity distribution of the bottom of a machining groove in the radial feeding direction of a tool cathode is equal everywhere, and the flatness of the bottom of the groove in electrolytic machining is effectively improved; and the long insulating boss and the insulating area with the width larger than that of the machined groove are designed, resistance and back pressure of electrolyte flowing through the machined surface from the bottom of the cutter are increased, flow field of the machining area is improved, and stray corrosion is effectively restrained.

The invention provides a treatment method of sulfur-containing slurry. In the method, the slurry is treated in a manner of adding acid to carry out a reaction, so that sulfur-containing substances in the slurry are completely converted. Through filtration and evaporative crystallization, the sulfur, as well as by-products, is recovered. The treatment method includes the operations of reaction, absorption, filtration, evaporative crystallization and liquid-solid separation. The treatment method has low cost and high efficient, is environment-friendly and saves energy, and can achieve recovery of the sulfur and the by-products, thereby satisfying environment protection and increasing economic benefit.

The invention provides a synthesis method of 3-(2-chloroethyl)-2-methyl-4H-pyrido [1,2-a] pyrimidine-4-ketone. The method comprises the following steps: carrying out substitution reaction on ethyl acetoacetate and 1-bromo-2-chloroethane under an alkaline condition to obtain 2-acetyl-4-chlorobutyric acid ethyl ester, and reacting the 2-acetyl-4-chlorobutyric acid ethyl ester with 2-aminopyridine to obtain a risperidone intermediate 3-(2-chloroethyl)-2-methyl-4H-pyrido [1,2-a] pyrimidine-4-ketone. The method is simple to operate and suitable for industrial production. The compound 2-acetyl-4-chlorobutyric acid ethyl ester provided by the invention can be used as a raw material or an intermediate for synthesizing 3-(2-chloroethyl)-2-methyl-4H-pyrido [1,2-a] pyrimidine-4-ketone, and then risperidone is synthesized. The invention also provides an application of the compound 2-acetyl-4-chlorobutyric acid ethyl ester as an impurity reference substance of the 3-(2-chloroethyl)-2-methyl-4H-pyrido [1, 2-a] pyrimidine-4-ketone.