438 results about "Cyclohexanone" patented technology

The invention belongs to the technical field of chemical production, and particularly relates to an efficient energy-saving refining system for producing cyclohexanone through dehydrogenation, which comprises an alcohol tower, a dehydrogenation heat exchanger, a dehydrogenation reactor, an alcohol tower feeding heat exchanger, a dehydrating tower, a light tower I, a light tower II, a ketone tower and an alcohol recovery tower which are connected in sequence, a middle feeding port of the alcohol tower is communicated with a tube pass discharging port of the alcohol tower feeding heat exchanger, a top discharging port of the alcohol tower is communicated with a tube pass feeding port of the dehydrogenation heat exchanger, a bottom discharging port of the alcohol tower is communicated with a middle feeding port of the alcohol recovery tower, and an alcohol ketone drying tower is additionally arranged between the alcohol tower feeding heat exchanger and the dehydration tower. A feed port of the alcohol ketone drying tower is communicated with a shell pass discharge port of the alcohol tower feed heat exchanger, and a liquid phase discharge port of the alcohol ketone drying tower is communicated with an upper feed port of the dehydrating tower. The alcohol tower adopts a process that raw materials directly enter the tower top, tower top reflux is cancelled, steam consumption is reduced, and the purpose of saving energy is achieved.

The present invention discloses a catalyst for dehydrogenating cyclohexanol to cyclohexanone, a preparation method thereof and an application thereof. The catalyst comprises a silica support and active components and active promoters uniformly loaded on the silica support; the active components include copper element, zinc element and magnesium element; the active promoter is selected from borate. The catalyst for dehydrogenating cyclohexanol to cyclohexanone disclosed by the present invention greatly enhances the interaction between the silica support and the active components, and significantly improves the long-term stability of the catalyst on the basis of ensuring that the catalyst has excellent catalytic activity and selectivity.

The invention relates to the technical field of chemical separation, in particular to a cyclohexanone rectification and purification method based on high-tower segmented packing, which comprises the following steps: step 1, filtering a cyclohexanone raw material containing impurities to remove solid particles, and dynamically adjusting the filtering precision according to the viscosity of the raw material; 2, arranging a bottom section, a middle section and a top section in the vertical high tower; the temperature gradient of each section is regulated and controlled through an independent temperature control unit, so that the temperature gradient of the middle section is matched with the relative volatility of the cyclohexanone-light component; 3, dynamically adjusting the reflux ratio based on the real-time detection result of the purity of the tower top distillate, and controlling an intermittent discharge valve according to the density change of the tower bottom heavy component enrichment liquid so as to continuously remove the heavy components; and 4, recycling the waste heat of the steam at the top of the tower for preheating the raw materials, and inhibiting the tower pressure fluctuation through a buffer tank. Through the innovative design of sectional packing of the high tower, the separation efficiency is improved, the energy consumption is reduced, and meanwhile, the equipment reliability is improved.

The invention relates to the technical field of chemical catalysis, in particular to a copper-silicon catalyzed cyclohexanol gradient dehydrogenation and hydrogen recycling method which comprises the following steps: step 1, preparing a gradient catalyst, namely carrying out surface hydroxyl regulation pretreatment on porous silica gel, and loading a copper salt solution by adopting a step-by-step impregnation method to form gradient distribution with gradually decreased copper loading capacity from outside to inside, carrying out segmented heating reduction in a reducing atmosphere containing 5vol% of H2 / N2; 2, gradient dehydrogenation reaction process control; and 3, hydrogen in-situ separation and cyclic utilization: separating hydrogen from the reaction outlet gas through a palladium alloy membrane, controlling the pressure difference of the two sides of the membrane to maintain the permeation flux, returning the separated hydrogen to the inlet of the reactor to adjust the hydrogen partial pressure, and storing the residual hydrogen. Through gradient catalyst preparation, accurate reaction process control and efficient hydrogen recovery technologies, the cyclohexanone production efficiency is improved, and long-term stability of the catalyst and efficient recycling of hydrogen are achieved.

The invention discloses a method for preparing cyclohexylamine based on reductive amination of cyclohexanone, and belongs to the technical field of fine chemical engineering. The preparation method comprises the following steps: adding a reactant cyclohexanone into a reaction kettle containing a certain amount of solvent, ammonia water and hydrogen atmosphere, and carrying out reductive amination reaction in the presence of a catalyst to obtain cyclohexylamine. The catalyst is CoyAl-LDHs loaded with metal active components, the CoyAl-LDHs are layered cobalt-aluminum bimetal hydroxides, and cobalt ions and precious metal ions in laminates are subjected to spontaneous oxidation-reduction reaction, so that the precious metal ions can be efficiently reduced into active metal nanoparticles. The layered cobalt-aluminum double-metal hydroxide not only has abundant surface acid-base sites, but also has high dispersity of loaded metal nanoparticles. The catalyst preparation and reductive amination reaction conditions are mild, the yield is high, the reaction system is simple and easy to separate, and the method is suitable for industrial production of cyclohexylamine.

The invention discloses a high molecular weight poly (p-dioxanone) (PPDO) microsphere as well as a preparation method and application thereof. By adopting a double emulsification-solvent evaporation method, an amphiphilic polymer, such as poly (p-dioxanone) (PDO) or a copolymer of PDO and a hydrophilic fragment (such as mPEG and mPPG), is utilized to perform self-assembly on a two-phase interface formed by emulsification under the combined action of amphipathy and polyvinyl alcohol (PVA) to form a double-micelle protective layer, so that the degradation effect of water on PPDO in the microsphere forming process is effectively blocked, and the PPDO can be effectively degraded. And finally, the high-molecular-weight poly (p-dioxanone) microspheres with stable performance are obtained, so that the high-molecular-weight PPDO microspheres have long-term stability. The preparation method is high in operability, mild in condition and suitable for large-scale production, high-molecular-weight poly (p-dioxanone) microspheres are obtained, and the preparation method has wide application prospects in the aspects of tissue filling agents, drug carriers, tissue scaffolds and the like.

The invention relates to a cyclohexanone concentration real-time monitoring and automatic adjusting method and system in the technical field of semiconductors, and the method comprises the steps: comparing a smoothed concentration value with a preset threshold value, if the concentration value exceeds a safety range, generating an abnormal signal, recording a timestamp, and determining a condition for triggering subsequent operation through the abnormal signal; after the abnormal signal is obtained, an instruction is sent to the control module, the water supplementing and liquid discharging device is activated according to instruction content, whether operation is successfully executed or not is judged from device state feedback, and execution result data is obtained; analyzing response time and flow change of the water replenishing and liquid discharging device through execution result data, updating control parameters by adopting a dynamic adjustment algorithm, and determining an accurate instruction of next operation according to the updated parameters; and extracting continuous concentration change trend data from the concentration monitoring module, judging whether the system is recovered to a safe range or not according to the change trend, and obtaining a current stability evaluation value.

The invention belongs to the technical field of pesticide preparations, and relates to a preparation method and application of prothioconazole sustained-release microspheres. The preparation method comprises the following steps: adding an active compound, an emulsifier, isocyanate and polycaprolactone polyol into cyclohexanone, and uniformly mixing to obtain an oil phase; adding a dispersing agent into water and uniformly mixing to obtain a water phase; and adding dibutyltin dilaurate into the oil phase, reacting, mixing with the water phase, shearing, and stirring to obtain the prothioconazole sustained-release microsphere suspending agent. The prothioconazole sustained-release microsphere prepared by the process still keeps higher bactericidal activity on the premise of good leaf surface stability, so that reduction of the pesticide application frequency, improvement of the pesticide utilization rate and long-acting prevention and control of prothioconazole in the field are expected to be realized, and the prothioconazole sustained-release microsphere conforms to the national double reduction policy and is suitable for large-scale popularization and application.

The invention relates to application of a non-noble metal catalyst Cu-ZnO / TiO2 in catalytic synthesis of N, N '-dicyclohexyl p-phenylenediamine in a heterogeneous system, and belongs to the technical field of catalyst preparation and application. According to the catalyst, zinc nitrate hexahydrate serves as a zinc source, copper nitrate trihydrate serves as a copper source, P25 type titanium dioxide serves as a carrier, metal is loaded on titanium dioxide through a fractional precipitation method, the titanium dioxide is put into a tubular furnace for hydrogen reduction, a catalyst Cu-ZnO / TiO2 is obtained, then the catalyst Cu-ZnO / TiO2 is dispersed in a solvent, and the novel rubber anti-aging agent N, N-dimethylformamide is synthesized by catalyzing a photo-thermal reduction amination reaction of p-phenylenediamine and cyclohexanone. The catalyst is N, N '-dicyclohexyl p-phenylenediamine. Wherein the Cu-ZnO / TiO2 catalyst with the content of copper being 7% and the content of zinc oxide being 4% has excellent catalytic performance, the conversion rate of p-phenylenediamine reaches 100% and the selectivity of N, N '-dicyclohexyl p-phenylenediamine reaches 99.9% when the hydrogen pressure is 6 MPa, the temperature is 200 DEG C and the reaction is performed for 10 h. The preparation method is simple, low in cost and high in catalytic selectivity, and has a wide industrialization prospect.

The invention discloses a catalyst for preparing cyclohexanone by cyclohexanol dehydrogenation coupled phenol hydrogenation, the catalyst has a composite metal hydrotalcite structure, the metal components comprise ruthenium, magnesium and aluminum, the metal components are uniformly dispersed in hydrotalcite, and the ruthenium, the magnesium and the aluminum respectively account for 1-5wt%, 10-30wt% and 1-10wt% of the total mass of the catalyst. The acid-base property, the specific surface area and the pore structure of the catalyst are optimized by adjusting the ratio of magnesium to aluminum, so that the dispersion of ruthenium is improved, the interaction between ruthenium and a hydrotalcite carrier is increased, and the synergistic effect of all the element components enables active centers in cyclohexanol dehydrogenation, hydrogen transfer and phenol hydrogenation processes to be efficiently combined together, so that the catalytic activity of the catalyst is improved. Rich alkaline sites are generated in the catalyst, the dehydration side reaction of cyclohexanol can be effectively inhibited, meanwhile, the selectivity of cyclohexanone prepared through phenol hydrogenation is improved, it is ensured that the phenol hydrogenation reaction and the cyclohexanol dehydrogenation reaction can be effectively coupled, and cyclohexanone is efficiently prepared.

The present invention relates to the chemical industry field, and particularly relates to a method for synthesizing valerolactam. The steps are as follows: cyclopentanone and the reaction auxiliary cyclohexanone are mixed in a certain proportion, and then through ammoximation reaction, Beckmann rearrangement reaction, hydrolysis and neutralization reaction, and then through separation, valerolactam is obtained. The method of the present invention has a high atom utilization rate and a high product extraction rate, and has the prospect of actual industrial production.

The invention relates to the technical field of sealing strips, and provides a tensile rubber sealing strip for an automobile and a preparation method of the tensile rubber sealing strip. The rubber sealing strip is prepared from, by weight, 65-75 parts of ethylene propylene diene monomer, 25-35 parts of chloroprene rubber master batch, 30-40 parts of thermoplastic polyurethane elastomer, 30-40 parts of filler, 1-2 parts of vulcanizing agent, 8-12 parts of vulcanization accelerator, 3-5 parts of plasticizer, 3-5 parts of anti-aging agent, 1-2 parts of stearic acid and 2-4 parts of zinc oxide, and the chloroprene rubber master batch is prepared from chloroprene rubber and 4-N-carbobenzoxy amino cyclohexanone. By means of the technical scheme, the problem that in the prior art, the rubber sealing strip is insufficient in tensile property is solved.

The invention relates to the technical field of electronic materials, in particular to a high-speed copper-clad plate resin mixture and a preparation method thereof. The high-speed copper-clad plate resin mixture is prepared from acetone, cyclohexanone, BNE type epoxy resin, DCPD type epoxy resin, an anhydride curing agent, fused silicon dioxide, toughened resin, modified nano silicon dioxide, phenolic resin, a phosphorus-containing flame retardant, phosphazene and an accelerant, and the modified nano silicon dioxide is subjected to amination treatment through a silane coupling agent KH-550; and then carrying out ring-opening grafting modification with polyethylene glycol diglycidyl ether and alicyclic epoxy resin. The high-speed copper-clad plate resin mixture disclosed by the invention has excellent thermal stability while ensuring good toughness, and solves the problem that the thermal stability of a traditional resin composition for a copper-clad plate is reduced due to the addition of toughening resin; the strict requirements of the high-frequency and high-speed copper-clad plate on the size stability, the signal integrity and the reliability are completely met.

The invention relates to the technical field of X oil recovery, and discloses a method for preparing cyclohexanol from a byproduct X oil in a cyclohexanone production process by a hydration method. The method comprises the following steps: (1) in the presence of hydrogen, introducing mixed reaction oil containing X oil and an organic solvent into a fixed bed reactor filled with a hydrogenation catalyst, and carrying out hydrotreatment to obtain a hydrotreatment effluent; (2) introducing the hydrotreating effluent into a desolventizing tower for first separation to obtain hydrogenated X oil and an organic solvent which can be recycled to the step (1); and (3) introducing the hydrogenated X oil into a cyclohexanol recovery tower for secondary separation to obtain gas-phase cyclohexanol and heavy X oil. According to the method provided by the invention, phenol in the X oil can be hydrogenated into cyclohexanol, efficient separation is carried out, effective utilization of phenol in the X oil is realized, and material loss in the production process is reduced.

The invention relates to the technical field of organic synthesis, in particular to a preparation method of 1, 1-cyclohexyl diacetic acid. The preparation method comprises the following steps: taking cyclohexanone and ethyl cyanoacetate as raw materials to react and dehydrate to prepare a product 1, then reacting cyanoacetamide, sodium methoxide and the product 1 at low temperature to obtain a product 2, and then hydrolyzing the product 2 under the catalysis of a magnetic solid double-acid catalyst to obtain the 1, 1-cyclohexyl diacetic acid. The used magnetic solid double-acid catalyst is prepared by loading a metal active layer and a sulfonic acid group on a magnetic mesoporous silicon dioxide carrier step by step, and has Lewis acid and Bronsted acid sites, and the catalyst is separated by an external magnetic field after the reaction. The method is short in reaction time and high in catalytic efficiency, the catalyst can be recycled, the separation problem of traditional homogeneous acid catalysis is avoided, and the method has the advantages of being mild in reaction condition, high in yield, environmentally friendly and the like and is suitable for industrial production of 1, 1-cyclohexyl diacetic acid.

The invention discloses a synthesis method of piperonone, and relates to the technical field of flavors, fragrances and chemical engineering, and the synthesis method comprises the following steps: taking acrylate as a raw material, and carrying out Michael addition reaction with isobutene under the action of Lewis acid to obtain 5-methyl-5-hexenoic acid ethyl ester; the preparation method comprises the following steps: carrying out nucleophilic substitution reaction on ethyl 5-methyl-5-hexenoate and bromoisopropane under the action of a basic catalyst to obtain ethyl 5-methyl-2-isopropyl-5-hexenoate; carrying out self Friedel-Crafts acylation reaction on the 5-methyl-2-isopropyl-5-hexenoic acid ethyl ester under the action of Lewis acid, so as to obtain 5-methyl-2-isopropyl-5-chloro cyclohexanone; and carrying out elimination reaction on the 5-methyl-2-isopropyl-5-chlorocyclohexanone under the action of alkali to obtain the product piperonone. According to the synthetic route, conventional chemical reagents are used as raw materials, reaction conditions are mild, emission of three wastes is reduced to a great extent, and the synthetic route is more environmentally friendly and suitable for continuous industrial production.

The invention relates to a method for continuously producing poly (p-dioxanone), which comprises the following steps: premixing glycollic acid or a glycollic acid derivative with a ring formation catalyst, and introducing the obtained mixed material and ethylene oxide into a synthesis reaction kettle for reaction; separating and purifying the obtained reaction product, introducing the obtained purified monomer into a polymerization reaction kettle, and adding a polymerization catalyst for polymerization; after polymerization is finished, discharging is conducted, residual materials in the polymerization reaction kettle are subjected to depolymerization treatment to clean the kettle body, after depolymerization is finished, depolymerization products generated in the depolymerization treatment process are discharged, the kettle does not need to be opened for cleaning, and the next round of polymerization production is directly conducted. According to the method disclosed by the invention, the steps of synthesizing the p-dioxanone monomer, separating and purifying the monomer, catalyzing and polymerizing, depolymerizing and cleaning the kettle body and the like are continuously carried out, so that the continuous production of the poly (p-dioxanone) is realized, the side reaction of oligomerization and degradation of the p-dioxanone in storage and transportation can be avoided, and the production cost of the poly (p-dioxanone) is obviously reduced.

The utility model relates to the field of chemical equipment, and particularly discloses a flash tank for processing cyclohexanone by a dilute method, which is used for solving the problem of low gas-liquid separation efficiency in the prior art. Comprising a flash tank body, a gas phase outlet used for discharging separated gas is formed in the upper end of the flash tank body, an isolation ring plate is further rotationally arranged in the flash tank body, a feeding port used for feeding is formed in the lower side of the isolation ring plate, and a coalescence separation module used for assisting solid-liquid separation is arranged at the lower end of the isolation ring plate. And the lower end of the coalescence separation module is connected with the isolation bottom ring. Rotation torque is constructed in the flash tank body, so that airflow rotates, the rotating airflow assists in solid-liquid separation, in addition, an auxiliary liquid gathering structure is further arranged, liquid is rapidly separated from the airflow, the separated liquid is rapidly discharged under the action of centrifugal force, the rotation torque is generated through airflow power, and solid-liquid separation is achieved. Extra power is not needed, so that the cost is reduced.

The present invention relates to the technical field of organic synthesis. Provided is a method for preparing 2,6-bis(4-azidobenzylidene)-4-methylcyclohexanone, comprising the following steps: S1, subjecting 4-nitrobenzaldehyde and trimethylsilyl azide to a nucleophilic aromatic substitution reaction to obtain 4-azidobenzaldehyde; S2, subjecting 4-azidobenzaldehyde and 4-methylcyclohexanone to an aldol condensation reaction, so as to obtain 2,6-bis(4-azidobenzylidene)-4-methylcyclohexanone. The described technical solution addresses the problems in the related art where the process for synthesizing 2,6-bis(4-azidobenzylidene)-4-methylcyclohexanone has low product yield, high costs and high energy consumption, and is not conducive to large-scale industrial production.

The invention discloses aquadag for an alkaline battery and application of the aquadag. The aquadag comprises the following raw materials in percentage by weight: 12-16% of graphite powder, 5-8% of conductive carbon black, 1-2% of graphene, 15-18% of epoxy resin, 30-50% of butanone and 10-20% of cyclohexanone. The preparation method of the aquadag comprises the following steps: (1) uniformly stirring butanone and cyclohexanone to obtain a composite solvent; (2) adding solid epoxy resin into the composite solvent, and stirring at 800-1000 rpm to completely dissolve the solid epoxy resin; (3) slowly adding graphite powder and conductive carbon black graphene into the composite solvent, and dispersing at a high speed of 1100-1200 rpm for 45-50 min to obtain a mixture; and (4) carrying out ball milling on the mixture, sieving with a 200-mesh sieve, and discharging to obtain the aquadag. The graphene is doped into the aquadag, so that the technical effect of improving the comprehensive performance of the battery is achieved.

The application discloses a preparation method of PPTA nanometer microsphere styrene butadiene rubber composite material, which comprises the following steps: 1) styrene butadiene rubber is added into a mixed solvent of cyclohexanone and N-methyl pyrrolidone, and heated and stirred until the styrene butadiene rubber is completely dissolved to obtain a transparent solution; 2) part of the transparent solution is taken, p-phenylenediamine and lithium chloride are added, and stirring is uniformly carried out to obtain solution A; p-phenylenediamine chloride is added into the remaining transparent solution, and stirring is uniformly carried out to obtain solution B; under the condition of nitrogen atmosphere and ice water bath, solution B is slowly dropped into solution A, and stirring reaction is carried out at room temperature to obtain a light brown solution; 3) deionized water is added into the light brown solution, and after stirring, filtration and washing, and drying, the PPTA nanometer microsphere styrene butadiene rubber composite material is obtained. The in-situ solution condensation method and the bottom-up method are combined to synthesize the PPTA nanometer particles which are uniformly dispersed in the rubber matrix, and the surface effect, the quantum size effect and the macroscopic quantum tunnel effect endow the composite material with high strength, high toughness, high impact resistance and other performances.

The invention discloses a process method for co-production of caprolactone and 2, 4-dimethyl benzoic acid. According to the method, cyclohexanone is taken as a raw material, oxygen is introduced as an oxidant, 2, 4-dimethyl benzaldehyde is added as a pro-oxidant, and caprolactone and 2, 4-dimethyl benzoic acid are generated through oxidation reaction. According to the technological method, oxygen and 2, 4-dimethyl benzaldehyde are used as a co-oxidation system, in the presence of the carbon framework material loaded Ti-based catalyst, cyclohexanone can be subjected to oxidation reaction under mild conditions to generate caprolactone, the reaction is safe and efficient, the selectivity of the product caprolactone and the co-product 2, 4-dimethyl benzoic acid is high, the raw material conversion rate is high, and the method is suitable for industrial production. The product yield can be obviously improved, and the economic applicability is good.

This invention discloses a low-to-medium temperature cyclohexanol dehydrogenation catalyst for cyclohexanone and its preparation method. The catalyst uses organomontmorillonite as a support, and copper species are loaded onto the support using an impregnation method. The copper ion content is 1%–20% by mass of the catalyst, and 0.1%–2% of an additive is added. After washing, drying, and calcination, the organomontmorillonite-supported copper catalyst is obtained. The catalyst prepared by this invention has high specific surface area, high activity, and stability. Under relatively low reaction conditions and with low copper content, the catalyst still exhibits good cyclohexanol conversion and cyclohexanone selectivity. Furthermore, due to the low reaction temperature, the aggregation of the active components of the catalyst is not significant, resulting in good stability.

The present invention relates to the field of Mannich base synthesis, and specifically relates to a pyrazole-based ionic liquid 1,2-dibenzyl-3,5-dimethylpyrazolium salt and its synthesis method, and provides a method for catalyzing the Mannich reaction therewith; at room temperature, the pyrazole ionic liquid is used as a catalyst and a solvent, and an aromatic aldehyde, an aromatic amine and cyclohexanone are subjected to a three-component Mannich reaction, and the product and the catalyst are separated with ethanol to obtain the Mannich base β-aminoketone; by screening the types of ionic liquids, solvents, the molar ratios of reactants, the dosage of ionic liquids and reaction temperatures, a series of Mannich bases with higher yields are obtained under the optimized conditions, and the yields are in the range of 77% - 93%. Moreover, the catalyst used is green and effective, has good thermal stability, can catalyze the synthesis of Mannich bases in a short time, the product and the catalyst are easily separated, and the catalyst can be recycled multiple times without obvious reduction in activity.

This invention discloses a method for preparing a supported cerium-chromium bimetallic catalyst and its application. First, an appropriate amount of modified alumina nanoparticles are dispersed in water. While stirring thoroughly, a certain amount of cerium and chromium sources are added, and stirring continues. Then, the mixture is heated to a certain temperature to evaporate the water. The resulting solid mixture is transferred to a covered crucible and calcined at a given temperature for a certain time. Finally, the obtained catalyst is ground into powder for later use. Under the action of the supported bimetallic catalyst, cyclohexane and an oxidant are thoroughly mixed in an organic solvent, heated, and reacted to produce cyclohexanone / alcohol. The cyclohexane catalytic oxidation method disclosed in this invention has a simple process, mild reaction conditions, requires no additives, and has low equipment requirements. Furthermore, the disclosed supported catalyst exhibits high catalytic activity, good stability, and no significant decrease in activity after multiple cycles, demonstrating good prospects for industrial application.

The invention discloses a near-infrared two-window fluorescent probe for detecting viscosity as well as a preparation method and application thereof, belongs to the technical field of biological fluorescence imaging contrast agents, and provides a structural formula of a viscosity probe and a preparation method of the near-infrared two-window fluorescent probe for detecting viscosity. Comprising the following steps: S1, cyclohexanone and 4-diethylaminoketonic acid are subjected to a reaction in concentrated sulfuric acid, and a solid product (a compound 1) is obtained through post-treatment; and S2, carrying out a reaction on the compound 1 obtained in the step S1 and 9-aldehyde julolidine in an ethanol solution. And carrying out post-treatment to obtain solid R-CHO. The detection method disclosed by the invention has the advantages of simplicity and convenience in operation, rapidness, accuracy, high sensitivity and the like, and is suitable for biomedical research, clinical diagnosis and other related fields.

The present invention discloses a system and process for the comprehensive utilization of hydrogen within a cyclohexanone esterification process plant, including the comprehensive utilization of tail hydrogen emitted from a benzene selective hydrogenation unit, the hydrogen source and emitted hydrogen from a cyclohexyl acetate hydrogenation unit, the hydrogen source and emitted tail hydrogen from a cyclohexane hydrorefining unit, and by-product hydrogen from a cyclohexanol dehydrogenation reaction unit. A system for treating and utilizing hydrogen within the plant is invented. Taking into account the composition of each emitted hydrogen or by-product hydrogen, the system utilizes mature, conventional technologies for low-cost treatment of the emitted hydrogen or by-product hydrogen, rather than employing TSA and / or PSA methods. This system achieves cascaded utilization of hydrogen within the cyclohexanone plant, reduces the amount of discharged hydrogen processed and the loss of valuable materials, reduces the amount of new hydrogen added to the plant, and reduces the production cost of cyclohexanone esterification process, thus having industrial application value.

The present application relates to a kind of bio-based surface treatment agent and its preparation method, belong to the technical field of treating agent.The raw material of bio-based surface treatment agent provided by the present application includes polyol PE-6056, isocyanate XFLO100, catalyst, CHDI, anti-sedimentation auxiliary agent, solvent, the solvent includes butanone, tetrahydrofuran, acetone, dimethylformamide, cyclohexanone, the bio-based surface treatment agent prepared has good initial adhesion, peeling strength when using, hydrolysis resistance and ageing resistance, with good application prospect.

The invention discloses an exhaled gas VOC (volatile organic compound) marker for detecting inflammatory bowel diseases and a detection system thereof. The marker is a combination of one or more of the following components: methyl propyl sulfide, propionaldehyde, cyclohexanone, allyl methyl sulfide, octanal, 2-pentanone, phenol, butyric acid, propionic acid and 3-methylheptane. The detection system comprises an exhaled air sampling module, a sample preprocessing module, a detection analysis module and a data analysis module. The marker provided by the invention has the advantages of high specificity and good stability, can realize accurate noninvasive diagnosis of IBD, and can assist in realizing early screening and dynamic monitoring in a clinical environment.

The invention relates to the technical field of sol agents, in particular to a hot melt adhesive scavenger. The hot melt adhesive scavenger is specifically prepared from the following components in parts by weight: 10 to 15 parts of dodecylbenzene sulfonic acid, 15 to 20 parts of N-methyl pyrrolidone, 5 to 10 parts of dimethyl sulfoxide, 5 to 10 parts of crosslinked polystyrene resin, 10 to 20 parts of cyclohexanone, 15 to 20 parts of propylene glycol phenyl ether, 2 to 5 parts of modified fumed silica and 0.5 to 1 part of benzotriazole. Through the synergistic effect of the organic acid and the polar solvent, the internal structural force of the adhesive and the adhesive force with a screen are destroyed, and meanwhile, the hot melt adhesive scavenger with good cleaning efficiency and stability is obtained by compounding various components.