72results about How to "Reduce chroma" patented technology

The invention provides a method for preparing lactulose from immobilized beta-galactosidase, and belongs to the technical field of functional sugar preparation.The method comprises the following steps that an immobilized enzyme column is prepared, specifically, macroporous alkalescent styrene anion exchange resin is soaked and washed with an ethanol solution, a NaCl solution, an HCl solution and a NaOH solution in sequence; the pretreated resin and beta-galactosidase liquid are mixed, a buffer solution is added, shaking table adsorption is performed, and standing is performed after adsorption; adding a glutaraldehyde solution for cross-linking, and discarding the supernatant to obtain an immobilized enzyme column; adding a magnesium ion solution into a mixed solution of lactose and fructose, and then performing conversion through an immobilized enzyme column to obtain a lactulose conversion solution; the lactulose conversion liquid is sequentially subjected to decoloration, ion exchange, vacuum concentration and continuous simulated moving bed chromatographic separation to obtain a lactulose solution, by means of the method, the lactulose conversion rate is larger than or equal to 60%, the lactulose yield is larger than or equal to 92%, the preparation process is simple, and the cost is low.

The invention discloses a flocculating agent for coking wastewater and a preparation method and application thereof, the flocculating agent is prepared from the following raw materials in parts by weight: 1-5 parts of poly dimethyl diallyl ammonium chloride and 6-12 parts of a compound, and the compound is prepared from kaolin loaded N-succinyl-O-carboxymethyl chitosan and konjac glucomannan. The method is used for solving the technical problem that the coking wastewater cannot reach the discharge standard.

The invention belongs to the technical field of thermosetting polyphenyl ether, and particularly relates to thermosetting polyphenyl ether as well as a preparation method and application thereof. The preparation method of the thermosetting polyphenyl ether comprises the following steps: mixing a copper catalyst, an amine compound, an organic acid compound, an organic acid ester compound, monohydric phenol, dihydric phenol and a solvent, reacting, and removing the copper catalyst to prepare a dihydroxy-terminated polyphenyl ether solution; and mixing an end-capping catalyst, an alkenylation reagent and the dihydroxy-terminated polyphenyl ether solution, reacting, separating and purifying to obtain the thermosetting polyphenyl ether. The organic acid compound and the organic acid ester compound are simultaneously added in the oxidative copolymerization process, the organic acid compound and the organic acid ester compound have a synergistic effect and are combined with other components, so that the chromaticity of the thermosetting polyphenyl ether can be obviously reduced, and the platinum-cobalt chromaticity value of a 50wt% butanone solution can be as low as 14-16; meanwhile, the intrinsic viscosity and the molecular structure of the thermosetting polyphenyl ether are not obviously changed.

The invention belongs to the technical field of high polymer materials, and particularly relates to a production method of environment-friendly polycarbonate. The production method comprises the following steps: S1, adding diphenyl carbonate, isosorbide and bisphenol fluorene into a reaction kettle, protecting by using a nitrogen atmosphere, and then mixing to obtain a mixed material; s2, adding a titanium silicalite molecular sieve composite catalyst into the mixed material, then carrying out ester exchange reaction, then carrying out condensation polymerization, pouring out a product while the product is hot after the reaction is finished, and cooling to obtain an intermediate product; s3, mixing and stirring the intermediate product, pyridine type ionic liquid modified hydrotalcite, a rubber elastomer, a compatilizer and an antioxidant to obtain a premix; and S4, carrying out melt extrusion, strip drawing, water cooling, air drying, pelletizing and drying on the premix in a double-screw extruder to obtain the environment-friendly polycarbonate. The polycarbonate produced by the production method not only has low chromaticity, but also has excellent impact resistance, heat resistance and flame retardance.

The invention relates to the technical field of sewage treatment, and provides a treatment system for reconstituted tobacco wastewater, which comprises a sewage pretreatment unit, a fiber recovery unit and a fiber drying unit, the sewage pretreatment unit comprises a first water collecting tank, a second water collecting tank, a coarse screen and a fine screen; reconstituted tobacco wastewater is introduced into the first water collecting tank; the water inlet of the second water collecting tank is communicated with the water outlet of the first water collecting tank; the fiber recovery unit comprises a third water collecting tank, a recovery plate and a recovery box; the water inlet of the third water collecting tank is communicated with the water outlet of the second water collecting tank; the fiber drying unit comprises a sedimentation tank and a sludge treatment tank; a water inlet of the sedimentation tank is communicated with a water outlet of the third water collecting tank, and a sludge outlet of the sedimentation tank is connected with a sludge inlet of the sludge treatment tank. According to the method, the fibers can be effectively recycled, the chromaticity and COD of the wastewater are reduced, and the reconstituted tobacco wastewater treatment efficiency and effect are improved.

The invention relates to the technical field of bio-based polyester synthesis, in particular to a preparation method of poly (ethylene 2, 5-furandicarboxylate). Comprising the following steps: purification of 2, 5-furandicarboxylic acid: purifying the 2, 5-furandicarboxylic acid by sequentially adopting activated carbon, dealdehyding resin and a modified adsorbent, so that the content of acyl furoic acid, furoic acid and aldehyde impurities can be effectively reduced, side reactions are reduced, and the chroma of a finished product is reduced. Adding the purified 2, 5-furandicarboxylic acid, ethylene glycol, a composite catalyst and a composite stabilizer into a reaction container, and carrying out esterification reaction and polycondensation reaction to obtain 2, 5-furandicarboxylic acid glycol ester; a mixture of aluminum acetylacetonate, antimony triphenyl diacetate and zinc acetate is used as a catalyst of poly (ethylene 2, 5-furandicarboxylate), so that the color of PEF can be effectively improved.

The invention provides a method for preparing lactulose and co-producing lactitol, and belongs to the field of functional sugar. The method comprises the following steps: sequentially carrying out first high-temperature isomerization, concentration and second high-temperature isomerization on a decolored lactose solution to obtain a mixed solution; sequentially carrying out refining and chromatographic separation extraction on the mixed solution to obtain a lactulose solution and raffinate; refining, crystallizing and drying the lactulose solution to obtain crystalline lactulose; refining the raffinate, adjusting the pH value, and carrying out hydrogenation reaction to obtain a lactitol crude liquid; the lactitol crude liquid is subjected to refining and nanofiltration membrane filtration in sequence, and a lactitol solution is obtained; and refining, crystallizing and drying the lactitol solution in sequence to obtain crystallized lactitol. According to the method, the lactose is subjected to two times of high-temperature conversion under the alkaline condition, the conversion rate of the lactulose can reach 55% or above and is far higher than that of an existing lactulose preparation method, the content of the lactose in the converted feed liquid is reduced, and the problem that unreacted lactose is easy to separate out and crystallize in the lactulose preparation process is solved.

The invention discloses a continuous preparation method of lauroyl chloride, which comprises the following steps: heating and melting lauric acid to obtain lauric acid melt; the method comprises the following steps: preparing an overflow diode reactor, continuously introducing phosgene and lauric acid melt into a first tubular reactor, reacting at 50-100 DEG C to obtain a photochemical reaction solution, continuously overflowing the photochemical reaction solution into a second tubular reactor, continuously reacting the unfinished reaction solution, and driving light by nitrogen to obtain lauroyl chloride. The continuous preparation method disclosed by the invention has the advantages of simple process, low online liquid carrying amount, convenience in operation, low cost and the like, and the obtained product is low in chromaticity, high in purity, few in impurities, suitable for industrial production and wide in application prospect.

The invention relates to the technical field of polystyrene resin and a preparation method thereof, in particular to yellowing-resistant polystyrene resin for an optical plate and a preparation method thereof, the yellowing-resistant polystyrene resin for the optical plate comprises specific amounts of styrene monomer, a molecular weight regulator, a slipping agent, a polymerization solvent, an antioxidant, an antioxidant auxiliary agent, a light stabilizer and an ultraviolet absorbent. According to the preparation method disclosed by the invention, by adding a specific amount of additives such as the antioxidant, the antioxidant adjuvant, the ultraviolet absorbent and the light stabilizer, the prepared polystyrene resin material has the characteristics of high purity, high light transmittance, low chromaticity, low residual monomer content and the like; the thermo-oxidative aging resistance and the ultraviolet aging resistance of the polystyrene resin material can be improved, the aging time of the material is delayed, the long-term yellowing resistance effect is achieved, and the polystyrene resin material is particularly suitable for manufacturing optical-grade plates.

The utility model provides a white spirit brewing wastewater treatment system. The white spirit brewing wastewater treatment system comprises a pretreatment device, an anaerobic treatment device, a middle sedimentation tank, an anoxic / aerobic treatment device, a secondary sedimentation tank, an air floatation treatment device and a final sedimentation tank which are arranged in sequence, the pretreatment device comprises a grating tank, a regulating tank, a coagulative precipitation tank and an acidification tank which are arranged in sequence, and a water outlet of the grating tank is connected to the regulating tank; a water outlet of the coagulative precipitation tank is connected to the acidification tank; the anaerobic treatment device is used for performing anaerobic treatment on the wastewater treated by the pretreatment device; the mid-settling tank is used for settling the wastewater of the anaerobic treatment device; the secondary sedimentation tank is used for carrying out solid-liquid separation on effluent of the anoxic / aerobic treatment device; the air floatation treatment device comprises a buffer tank and an air floatation machine which are arranged in sequence. When the liquor brewing wastewater treatment system is used for treating liquor brewing wastewater, the liquor brewing wastewater can reach the indirect discharge standard in Discharge Standard of Fermented Alcohol and White Liquor Industrial Water Dye (GB27631-2011).

The invention discloses a centralized wastewater treatment device and method for a food park, and the method comprises the following steps: low-concentration wastewater passes through a first grid and then enters a comprehensive oil removal adjusting tank, and high-concentration wastewater passes through a second grid and a high-concentration oil removal adjusting tank in sequence and then is pumped into the comprehensive oil removal adjusting tank; effluent of the comprehensive oil separation regulating tank sequentially passes through an air floatation tank, a primary sedimentation tank, an internal circulation anaerobic reactor, an A / O tank, a secondary sedimentation tank and a magnetic coagulation sedimentation tank, and is discharged after reaching the standard. According to the invention, the food park enterprise wastewater is collected for centralized treatment, through physicochemical pretreatment of the front-end air floatation tank and the primary sedimentation tank, biochemical treatment of the middle-end internal circulation anaerobic reactor and the A / O tank, and deep physicochemical treatment of the tail-end magnetic coagulation sedimentation, insoluble reducing substances, SS, chromaticity, total nitrogen and total phosphorus in the wastewater are effectively reduced, the treatment effect is good, and the efficiency is low; meanwhile, the biochemical treatment process combines internal circulation and external circulation, so that self-digestion of the sludge is realized.

The invention provides aliphatic acyl chloride and a purification method thereof. The purification method comprises the following steps: S1, introducing a crude product mixed solution which is obtained by reacting aliphatic carboxylic acid with phosgene and has the temperature of 50-100 DEG C into a gas driving tower at the flow rate of Q1, carrying out first purification, and extracting a first purified solution from the tower bottom of the gas driving tower; s2, the first purified liquid is introduced into a light component removal tower at the flow rate of Q2 for secondary purification, light component impurities are extracted from the tower top, and a second purified liquid is extracted from the tower bottom at the flow rate of Q3; s3, introducing the second purified liquid into a rectifying tower at the flow rate of Q4 for third purification, extracting a third purified liquid at the flow rate of Q5 from the tower top, and extracting heavy component impurities from the tower bottom; and S4, carrying out carbon adsorption treatment on the third purified liquid to obtain aliphatic acyl chloride. According to the method, residual phosgene, hydrogen chloride, amide compounds and light and heavy component impurities in the aliphatic acyl chloride crude product are effectively removed, and the purity of the aliphatic acyl chloride product is remarkably improved.

The invention discloses a method and a device for treating supersaturated wastewater containing chlorobenzene organic matters, and belongs to the technical field of high-concentration organic wastewater treatment. According to the technical scheme, the method for treating the supersaturated wastewater containing the chlorobenzene organic matters comprises the following steps: 1) separating and dissolving undissolved chlorobenzene; 2) oxidizing chlorobenzene and regenerating filler; 3) thoroughly oxidizing chlorobenzene and intermediate products thereof; (4) flocculating settling; the device comprises a first-stage reaction tower, a second-stage reaction kettle and a flocculation sedimentation tank which are sequentially connected through pipelines, the first-stage reaction tower is provided with a wastewater inlet pipeline and a first-stage reaction tower water outlet pipeline, and the first-stage reaction tower water outlet pipeline is provided with an acid liquor feeding pipeline, an oxidizing agent I or catalyst feeding pipeline and a first-stage UV reactor; and a second-stage UV reactor is arranged on a pipeline between the first-stage reaction tower and the second-stage reaction kettle. The method is suitable for treatment processes of high-concentration / supersaturated chlorobenzene-containing organic matter wastewater and high-concentration / supersaturated chlorobenzene-containing organic matter wastewater.

The invention discloses a preparation method and application of a biological flocculant, white-rot fungi is used as a treatment strain, the white-rot fungi are subjected to enrichment culture and domestication to prepare a microbial liquid, the microbial liquid is compounded with a magnetic substance, and finally the compound is loaded on cellulose modified montmorillonite to prepare the flocculant. According to the flocculant disclosed by the invention, nutrient substances in the medicinal plant processing wastewater are converted into proteins by using the white-rot fungi, so that the medicinal plant processing wastewater is treated, and the COD (Chemical Oxygen Demand), the chromaticity and the pH (Potential of Hydrogen) of the wastewater are reduced, so that the wastewater reaches a discharge standard. The biological flocculant disclosed by the invention is loaded on cellulose modified montmorillonite, so that the pressure resistance of white-rot fungi to a growth environment is improved, high-concentration wastewater is prevented from inhibiting mycelial growth, and the wastewater treatment efficiency is improved.

The application discloses a preparation method of 2,2-di(3,3'-epoxycyclohexyl)propane, which uses a cycloalkadiene compound 2,2-di(3,3'-cyclohexenyl)propane as raw material, adopts a titanium silicalite / heteropoly acid phase transfer homogeneous catalytic system, uses hydrogen peroxide as an oxidant, catalytically synthesizes mono-epoxide and di-epoxide, and finally separates, refines and purifies the mono-epoxide (2,3-epoxycyclohexyl-2,3-cyclohexenyl)propane and the target product di-epoxide 2,2-di(3,3'-epoxycyclohexyl)propane through molecular distillation. The application no longer uses a traditional peroxycarboxylic acid process, and the obtained epoxidation product has high yield, high epoxy value, low colority and low chlorine content; meanwhile, the reaction system of the epoxide is simple, the process condition is mild, the reaction time is short, the reaction is safe and controllable, the environment is friendly, the technical and economic requirements can be met, the operation can be continuous, and the application is particularly suitable for occasions of large-scale production.

The application relates to a sulfonic acid decoloring resin and a preparation method and use thereof. The application relates to a method for reducing the colority of acrylic acid and ester, methacrylic acid and ester. The method increases active groups after chemical modification of the resin, reacts with impurities causing product discoloration, separates and completely removes the discoloring impurities in the product, does not introduce new impurities into the product, greatly improves the colority of the product and the stability of the product, and ensures stable application of the product in the optical field.

The invention discloses a biological treatment agent for mine heavy metal wastewater and a preparation method of the biological treatment agent, and relates to the technical field of heavy metal wastewater treatment.The biological treatment agent is prepared by the steps that firstly, marine rhodotorula benthica and rhizopus nigricans are cultured through a liquid culture medium to obtain mixed bacterium suspension, and then the mixed bacterium suspension is adsorbed through modified coal gangue; and then carrying out sodium alginate-polyvinyl alcohol composite embedding and immobilization to obtain the product. The modified coal gangue serves as an adsorption carrier and is combined with sodium alginate and polyvinyl alcohol to prepare the composite immobilized microbial agent capable of stably exerting microbial activity, multiple heavy metals can be efficiently purified at the same time, meanwhile, COD and chromaticity in wastewater can be synchronously reduced, the comprehensive treatment effect is excellent, and the method is suitable for industrial production. The application prospect is good.

The invention discloses a recycling treatment method of printing and dyeing wastewater. The method is used for treating boiling wastewater, bleaching wastewater, dyeing wastewater and washing wastewater which are respectively generated in a desizing boiling process, a bleaching washing process, a dyeing process and a washing process of textiles. The bleaching wastewater is subjected to second ultrafiltration treatment, a second ultrafiltration filtrate is introduced into a microbubble generation device to be treated and then reused in the desizing and boiling process, the boiling wastewater is subjected to first ultrafiltration treatment, a first ultrafiltration filtrate is subjected to first nanofiltration treatment, and a first nanofiltration filtrate is reused in the washing process. After the dyeing wastewater is subjected to second nanofiltration treatment, second nanofiltration filtrate is recycled to the washing process. The wastewater generated in the textile printing and dyeing process is subjected to resource utilization, water with different characteristics is subjected to corresponding treatment and then recycled to different process units, the effect of the desizing and boiling process can be enhanced, and resource utilization of the wastewater is achieved to the maximum extent.

The present application relates to the technical field of wastewater treatment, and specifically discloses a printing and dyeing wastewater treatment process, comprising the following steps: step 1) adding the printing and dyeing wastewater into a regulating tank, adjusting the pH to neutral, entering the flotation tank, adding flocculant A, removing suspended matter, and performing mud-water separation; step 2) adding the printing and dyeing wastewater treated in step 1) into an anaerobic tank for anaerobic bacteria treatment; then entering a deep well aeration tank for treatment; entering a sedimentation tank, adding flocculant B for treatment; step 3) the printing and dyeing wastewater treated in step 2) enters an ozone tank for treatment, and then performs multi-stage filtration in a sand filter tank, and the printing and dyeing wastewater meets the discharge standards; the printing and dyeing wastewater treatment process of the present application has simple steps, low cost, high efficiency, green environmental protection, and broad application prospects.

The invention discloses an industrial salicylic acid refining and purifying method which comprises the following steps: S1, adding industrial salicylic acid into pure water, stirring and heating to 55-85 DEG C; s2, a reducing agent is added, and heat preservation and stirring are conducted for 20- And S3, cooling to 35-45 DEG C, filtering, centrifuging, and drying to obtain refined salicylic acid. According to the refining and purifying method provided by the invention, impurities such as water-soluble inorganic salts, colored substances and the like in the industrial salicylic acid are removed by using the pure water and the reducing agent, so that the product is refined and purified, and the refining and purifying method has the characteristics of remarkable effect, simple process, high practicability and the like, and is suitable for industrial production.

The invention discloses macroporous polar adsorption resin for removing a paint film in oil for electric power and a preparation method of the macroporous polar adsorption resin, and relates to the technical field of purification and regeneration treatment of the oil for electric power, the preparation method comprises the following steps: mixing macroporous adsorption resin and an organic solvent, heating, and continuously stirring in the heating process until the macroporous adsorption resin is fully swelled to obtain a swelled product; a functional monomer is added into the swelling product, heating is conducted, the stirring speed is kept, stirring is conducted, then a reaction is conducted, modified resin is obtained, and the functional monomer is an alkaline strong-polarity modifier; and filtering and washing the modified resin until the washing liquid is neutral and completely clear, and drying to obtain the macroporous polar adsorption resin. The macroporous adsorption resin is used as the precursor, so that the synthesis method is simple and good in stability, the functional monomer containing amino is used for modifying the precursor, the effect of removing the paint film in the degraded electric oil is better, the chromaticity of the oil can be reduced, and the service life of the oil can be effectively prolonged.

The application discloses a flocculant for coking wastewater and a preparation method and application thereof, and comprises the following raw materials in parts by weight: 1-5 parts of polydimethyl diallyl ammonium chloride and 6-12 parts of a composite, wherein the composite is prepared from kaolin loaded N-succinyl-O-carboxymethyl chitosan and konjac glucomannan. The application aims at solving the technical problem that coking wastewater cannot reach the discharge standard.

The invention relates to the technical field of sewage treatment agents, in particular to an aluminum-manganese composite coagulant and a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: dissolving an aluminum salt and a manganese salt to obtain a solution containing the aluminum salt and the manganese salt; mixing the solution containing the aluminum salt and the manganese salt with an alkaline solution for the first time to obtain a first mixed solution; and secondarily mixing the first mixed solution, a sodium silicate solution and a polyacrylamide solution to obtain a second mixed solution, and standing and curing the second mixed solution to obtain the aluminum-manganese composite coagulant. The aluminum-manganese composite coagulant obtained by the preparation method disclosed by the invention has a wider pH application range, the capability of removing natural organic matters is improved, and the chromaticity problem caused by manganese residues can also be reduced. And the flocculant is extremely easy to flocculate and settle in the water treatment process, so that chemical residues can be reduced.

This invention discloses a flash deodorization method for lanolin, belonging to the field of lanolin refining technology. The method includes: S101: dissolving crude lanolin in 4-6 times its volume of anhydrous hot ethanol, then sending it to the upper part of a vacuum flash evaporator and spraying it downwards; S102: introducing hot nitrogen gas at a temperature of 95-105℃ into the lower part of the vacuum flash evaporator, with the nitrogen gas in countercurrent contact with the crude lanolin spray solution; S103: after circulating and spraying the crude lanolin in the vacuum flash evaporator for a certain period, sending it to a first oil-water separator for cooling, separating the ethanol to obtain lanolin. The exhaust gas from the vacuum flash evaporator is sequentially sent to a power wave tower, a condenser, a gas-liquid separator, and a vacuum device; anhydrous ethanol is circulated and sprayed in the power wave tower, with the spray solution temperature at 45-50℃. This patented method can deodorize lanolin to odorless levels and also has the advantages of significantly reducing color and achieving a high yield.

The invention provides a preparation method of cosmetic grade 1, 3-butanediol. Industrial-grade 1, 3-butanediol is washed, extracted and rectified through a buffer solution, odorless 1, 3-butanediol is prepared, the content of 1, 3-butanediol is larger than 99.8%, key impurities are not detected, the product is free of peculiar smell, and the odorless 1, 3-butanediol can be applied to the field of cosmetics.

An optical ranging module is defined with an object side and an element side opposite to the object side, and comprises: an optical emission unit; an optical receiving unit; the supporting cover comprises a top and an annular side wall connected with the top, the top is provided with an object side surface, the annular side wall is provided with an outer surface, the top comprises two openings penetrating from the object side to the element side, and the optical transmitting unit and the optical receiving unit are arranged in the two openings respectively; the base is arranged on one side, facing the element side, of the supporting cover; the conductive film is arranged on the object side surface of the top of the supporting cover and the outer surface of the annular side wall; and an anti-reflective film covering the conductive film on the top of the support cover. The anti-reflection film can be made of a low-chromaticity and low-brightness material, so that the reflectivity of the top of the supporting cover is reduced, the measurement accuracy of the optical distance measuring module can be improved, and a terminal product (electronic device) is enabled to present a relatively consistent appearance.

A high-efficiency ozone reaction tower comprises a tower body, the top of the tower body is provided with a feed inlet and an ozone tail gas port, the right upper side of the side wall of the tower body is provided with a water outlet and an overflow port, the left lower side of the side wall of the tower body is provided with an ozone inlet and a backwashing gas inlet, and the right lower side of the side wall of the tower body is provided with a water inlet and an emptying port. A manhole is formed in the lower side of the side wall of the tower body; an ozone catalyst packing layer and a cobblestone cushion layer are arranged in the tower body, the ozone catalyst packing layer is arranged on the cobblestone cushion layer, and an effluent overflow weir is arranged above the ozone catalyst packing layer; an ozone inlet system, a water inlet system and a backwashing system are arranged in the cobblestone cushion layer; the efficient ozone reaction tower is also connected with an automatic pH adjusting device; the utility model aims to improve the wastewater treatment capacity and the purification effect, reduce the chromaticity of the wastewater and improve the biodegradability of the treated water.

The invention provides liquid polysulfide rubber as well as a preparation method and application thereof. The preparation method of the polysulfide rubber comprises the following steps: (1) preparing a polysulfide polymer; (2) cracking the multi-sulfur polymer obtained in the step (1) to obtain a cracking product; and (3) acidizing the organic solution containing the cracking product to obtain the liquid polysulfide rubber, in the step (3), a solvent in the organic solution is selected from at least one or a mixture of two or more of benzene, methylbenzene, xylene and ethylbenzene. According to the invention, the organic solvent is added into the cracking product, the organic solution of the cracking product is prepared firstly, and then the acidizing treatment is carried out, so that the operation is simplified, the chroma of the product is reduced, the product quality is improved, and the product has excellent oil resistance, ozone resistance and low-temperature performance and is wider in application range.

The invention discloses a method for synthesizing N-methyl-piperidine ethanol through reductive amination and application, and the method comprises the following steps: S1, mixing 2-piperidine ethanol as a reaction substrate with formaldehyde in the presence or absence of a solvent, adding a catalyst, introducing hydrogen, and reacting at the reaction temperature of 60-200 DEG C and the hydrogen pressure of 1.0-5.0 MPa to prepare a reaction solution containing a product, wherein the molar ratio of the 2-piperidine ethanol to the formaldehyde is 1: (1.1-1.5), and the catalyst is a NiZn / Al2O3 catalyst; s2, after the catalyst is recovered, when the solvent exists, the reaction liquid is subjected to reduced-pressure solvent recovery and then subjected to reduced-pressure rectification, and when the solvent does not exist, the reaction liquid is subjected to reduced-pressure rectification; and collecting fractions at 92-94 DEG C / 2 kPa in vacuum rectification to obtain the N-methyl-piperidine ethanol. The method has the advantages of high atom economy, green and environment-friendly production process, high yield and high selectivity, and is suitable for industrial large-scale production of N-methyl-piperidine ethanol.

The invention relates to a method for treating epichlorohydrin wastewater by using an iron-copper supported catalyst. The treatment method comprises the steps of preparing the iron-copper supported catalyst, adjusting the pH value of the epichlorohydrin wastewater, oxidizing the epichlorohydrin wastewater and the like. The epichlorohydrin wastewater treatment method is simple in technological process, easy and convenient to operate and mild in treatment condition, iron and copper metal ions are fixed to the surfaces of the aluminum oxide balls, the problem of iron / copper sludge is solved, the TOC degradation rate reaches 90% or above through the synergistic effect of the iron and copper metal ions, and therefore the epichlorohydrin wastewater treatment method has extremely good market application prospects.