11 results about "Methylcyclopentane" patented technology

The invention relates to the technical field of chemical separation and extractive distillation, and discloses a method for separating n-hexane and methylcyclopentane by an organic Rankine cycle assisted extractive distillation dividing wall column. The device comprises two parts, one part is a cyclohexane separation tower, and the other part is an organic Rankine cycle auxiliary extractive distillation dividing wall tower. The technical innovation lies in that the original double-tower extractive distillation is coupled into a single dividing wall tower, the separation of a multi-component mixture can be realized, and meanwhile, the organic Rankine cycle is introduced from the perspective of power generation to realize the recovery of sensible heat in the tower kettle material flow of the main tower and power generation. According to the device, on one hand, the extractive distillation dividing wall column is adopted to replace the original double-column extractive distillation, so that the backmixing problem among components can be reduced, and the energy consumption and the investment cost can be reduced; and on the other hand, organic Rankine cycle is adopted to convert heat energy into electric energy, effective utilization of waste heat is achieved, and wide application prospects are achieved.

The utility model provides a crude cyclohexane refining recovery system which comprises a cyclohexane refining reactor and a cyclohexane rectifying tower, the bottom of the cyclohexane refining reactor is connected with the cyclohexane rectifying tower through a pipeline, and the top of the cyclohexane rectifying tower is connected with a first return tank through a first circulating water condenser and a cyclohexanol rectifying tower reboiler respectively. The first reflux tank is connected with the methylcyclopentane separating tower through a pipeline, the bottom of the methylcyclopentane separating tower is connected with the methylcyclopentane rectifying tower through a pipeline, and the bottom of the methylcyclopentane rectifying tower is connected with the cyclohexane rectifying tower through a pipeline. The device disclosed by the utility model is ingenious in design, can greatly improve the utilization efficiency of cyclohexane, and has good economic benefits.

The present application relates to a kind of n-hexane-methylcyclopentane energy-saving rectification separation system and process, belong to separation process technical field;The separation system includes extractive distillation column and extractive agent regenerator, the bottom of the extractive distillation column is communicated with heat pump reboiler and extractive agent regenerator middle portion by circulating pump respectively;The heat pump reboiler is communicated with the lower part of extractive distillation column by heat exchange reboiler;The bottom of the extractive agent regenerator is connected with heat pump evaporator by the heat exchange reboiler, the heat pump evaporator is communicated with the heat pump reboiler by heat pump compressor, the heat pump reboiler is sequentially connected with supercooling cooler and pressure reducing valve, the pressure reducing valve is communicated with the heat pump evaporator by pipeline.The high-temperature regenerated extractive agent produced by extractive agent regenerating unit is directly used as heat source to provide part of heating for extractive distillation column in the present application, realize the step-by-step utilization of high-temperature extractive agent waste heat, significantly reduce the external heating load of extractive distillation column, reduce system energy consumption.

The present invention belongs to the technical field of catalysis using zeolite molecular sieves, and relates to a method for preparing an HY-zeolite-supported nickel phosphide catalyst for a benzene hydroalkylation reaction, and the use. In the method, bivalent nickel ions supported by HY zeolite are used as a precursor, sodium hypophosphite is used as a reducing agent, and the catalyst precursor is subjected to a phosphating treatment by means of a chemical plating method, so as to prepare the catalyst. The method has the advantages of a simple preparation process, mild preparation conditions, and inexpensive and easily available raw materials, and is suitable for other solid acid type zeolite carriers. Under the same reaction conditions, the HY-zeolite-supported nickel phosphide catalyst has much higher catalytic activity and selectivity for benzene hydroalkylation than an HY-zeolite-supported nickel metal catalyst. In particular, the amount of isomerization byproducts, i.e., methylcyclopentane and methylcyclopentylbenzene, generated by the HY-zeolite-supported nickel phosphide catalyst is far lower than that of an HY-zeolite-supported nickel metal catalyst, and the HY-zeolite-supported nickel phosphide catalyst can replace a zeolite-supported noble metal catalyst and a zeolite-supported noble metal / non-noble metal (multi-metal) catalyst in terms of catalytic performance.

This invention discloses a fully bio-based 2,5-furandicarboxylic acid copolyester, its preparation method, applications, and closed-loop recycling method, belonging to the field of materials synthesis technology. Using bio-based dimethyl 2,5-dimethylfurandicarboxylate (DMFD), 1,4-butanediol (BDO), and (1R,3S)-1,2,2-trimethylcyclopentane-1,3-diethanol (TCDM) as raw materials, a high-performance 2,5-furandicarboxylic acid copolyester suitable for closed-loop chemical recycling was synthesized. This invention utilizes the aforementioned fully bio-based 2,5-furandicarboxylic acid copolyester, its preparation method, applications, and closed-loop recycling method. The addition of the (1R,3S)-1,2,2-trimethylcyclopentane-1,3-diethanol unit enhances the thermal and mechanical properties of the 2,5-furandicarboxylic acid copolyester, while also exhibiting excellent UV shielding and solvent resistance. It can be gently depolymerized and recycled with minimal loss of repolymerization performance, achieving a balance between high performance and recyclability.

The invention relates to a diazotization ring closing method for synthesizing a 4, 4-dimethyl-4H-cyclopentane benzophenanthrene compound. The diazotization ring closing method comprises the following steps of: adding a diazotization reagent; according to the method, an amino-containing biphenyl dimethyl fluorene compound is taken as a raw material, diazotization reaction and intramolecular ring-closing reaction are continuously completed in the same reaction system under anhydrous and anaerobic conditions, and the benzophenanthrene fused ring skeleton is directly constructed. According to the method, a diazo intermediate is generated in situ under an acidic condition, and is promoted to be converted to an intramolecular cyclization direction in the presence of a copper salt catalyst and a drying agent, so that the problems that a dibenzfluorene system is large in tension, and a traditional aminophenanthrene ring method is low in conversion rate and has many side reactions are effectively solved. The method is mild in reaction condition, independent of a high-load noble metal catalyst, simple and convenient to operate, good in adaptability to substituent groups, suitable for large-scale implementation and good in industrial application prospect.

The invention relates to a water-in-oil emulsion-based method for enhancing hydration curing hydrogen storage and a method for calculating the hydrogen storage capacity of the water-in-oil emulsion-based method for enhancing hydration curing hydrogen storage, and the water-in-oil emulsion-based method for enhancing hydration curing hydrogen storage comprises the following steps: adding a water-in-oil emulsion into a hydrate reaction container; an oil phase in the water-in-oil emulsion is at least one of cyclopentane, cyclohexane, methyl cyclohexane, methyl cyclopentane and hydrocarbon mineral oil; according to the phase equilibrium diagram of the hydrogen-thermodynamic promoter binary hydrate, obtaining a target temperature and a target pressure for generating the hydrogen hydrate; hydrogen is injected to target pressure, then the temperature is reduced to target temperature, heat preservation is conducted, and meanwhile stirring is conducted to generate hydrogen hydrate; or reducing the temperature to the target temperature and preserving heat, injecting hydrogen to the target pressure, and stirring to generate the hydrogen hydrate. By using the water-in-oil emulsion, a gas-liquid contact interface can be obviously increased, hydrogen storage conditions are reduced, hydrogen mass transfer and hydrate conversion rate can be efficiently enhanced, environmental friendliness and economical efficiency are achieved, and hydrogen storage efficiency can be obviously improved.

The invention discloses a full bio-based 2, 5-furandicarboxylic acid copolyester, a preparation method, application and a closed-loop recovery method, and belongs to the technical field of material synthesis, bio-based dimethyl 2, 5-dimethyl furandicarboxylate (DMFD), 1, 4-butanediol (BDO) and (1R, 3S)-1, 2, 2-trimethylcyclopentane-1, 3-dimethanol (TCDM) are used as raw materials to synthesize the high-performance 2, 5-furandicarboxylic acid copolyester suitable for closed-loop chemical recovery, and the high-performance 2, 5-furandicarboxylic acid copolyester is suitable for closed-loop chemical recovery. The invention discloses 1, 5-furandicarboxylic acid copolyester. According to the full-bio-based 2, 5-furandicarboxylic acid copolyester, the preparation method, the application and the closed-loop recovery method, due to the addition of a (1R, 3S)-1, 2, 2-trimethylcyclopentane-1, 3-dimethanol unit, the thermal performance and the mechanical performance of the 2, 5-furandicarboxylic acid copolyester are improved, and the full-bio-based 2, 5-furandicarboxylic acid copolyester has excellent ultraviolet shielding performance and solvent resistance, can be thermally depolymerized and recovered, and has a good application prospect. The repolymerization performance is basically lossless, and the unification of high performance and recoverability is realized.

The utility model provides a system for recycling heavy oil in cyclohexanone production, the system comprises a heavy oil coalescer, a heavy oil separator and the like, DMAC is added into heavy oil, so that the relative volatility of methylcyclopentane and cyclohexanol in the heavy oil can be improved, rectification separation of cyclohexanol is facilitated, cyclohexanol is convenient to recycle, the utilization rate of cyclohexanol is improved, and the enterprise cost is reduced. The pressure in the heavy oil separator can be reduced by using the two parallel vacuum pumps and the two parallel compressors, so that the boiling point of heavy oil in the heavy oil separator is reduced, and rectification separation is facilitated; and meanwhile, the use amount of 1.2 MPa live steam is also saved. The mixed steam compressed by the compressor is introduced into the second reboiler or the third reboiler according to different temperatures of the mixed steam, so that heat is provided for the heavy oil separator, meanwhile, the energy of the secondary steam is reasonably utilized, and the use amount of 1.2 MPa live steam is further saved.

The invention provides a cyclohexane catalytic dehydrogenation reaction system and method, and belongs to the technical field of cyclohexane dehydrogenation reaction. According to the cyclohexane catalytic dehydrogenation reaction system disclosed by the invention, microwave-assisted heating is introduced to be combined with a specific structural design, so that the performance of a cyclohexane dehydrogenation reaction is remarkably improved, a microwave electromagnetic field directly acts on reaction molecules and a catalyst, proton jumping and product desorption are accelerated, and reaction kinetic obstacles are effectively overcome; meanwhile, the microwave energy distribution is more uniform due to the asymmetric multi-concave-point or convex-point cavity wall design, the standard deviation is greatly reduced to 8% from 35% of a traditional device, and the thermal field uniformity is improved. According to the cyclohexane catalytic dehydrogenation reaction method, through the synergistic effect with the dehydrogenation reaction system, the target product benzene has high yield and selectivity, the generation of byproducts such as methylcyclopentane is effectively inhibited, and the difficulty and cost of subsequent separation and purification are reduced.

The invention belongs to the field of material synthesis, and discloses a separation method of a solution polymerization reaction product to solve the problem of high energy consumption of traditional sequential separation, including rectification path separation or dividing wall column integrated separation. The rectification path separation comprises solvent pre-separation or 1-octene pre-separation, and the separation scheme of the solvent pre-separation comprises a solvent pre-separation tower, a C6 separation tower, a 1-hexene separation tower, a solvent separation tower and a 1-octene light separation tower; the separation scheme of 1-octylene pre-separation comprises a 1-octylene pre-separation tower, a 1-octylene heavy separation tower, a C6 separation tower, a 1-hexene separation tower and a heavy component removal tower. The separation product comprises a C6 by-product, 1-hexene, 1-octene, a circulating solvent and a heavy component, and the C6 by-product comprises methyl cyclopentane and methylene cyclopentane; and the circulating solvent is further purified through the amino-functionalized adsorption material. The method breaks through the fixed separation sequence, reduces the energy consumption, improves the solvent recovery rate and purity, and is suitable for industrial production.