83 results about "Batch distillation" patented technology

Fluid sensor methods and systems adapted for monitoring and / or controlling distillation operations in fluidic systems, such as batch distillation operations or continuous distillation operations, are disclosed. Preferred embodiments are directed to process monitoring and / or process control for unit operations involving endpoint determination of a distillation, for example, as applied to a liquid-component-switching operation (e.g., a solvent switching operation), a liquid-liquid separation operation, a solute concentration operation, a dispersed-phase concentration operation, among others.

The invention discloses a novel process of regenerating base oil from waste lubricating oil. The process which applies an advanced molecular distillation technology to regenerate base oil from waste lubricating oil can not only regenerate better base oil, but also carry out effluent fraction through multilevel series connections. The waste lubricating oil is deprived of light diesel oil in a rectification tower through pretreatment and deprivation of light components, and then the waste lubricating oil is pumped into a first-level molecular still through a first-level feed pump to distill off a relatively lighter base oil component as a product. Heavier components which are left by the first-level distillation and serves as the raw material of a second-level molecular still are pumped into the second-level molecular still through a second-level feed pump to distill off a component heavier than the first-level molecular distillation product to serve as a product, and the distillation residuals are taken as the raw material of a third-level distillation. The process is repeated in the manner until a required n level is reached, wherein n is more than or equal to 2 and is less than or equal to 5, and the recommended optimal level number is 3 or 2. The process has the advantages that: the obtained product only contains the base oil component, while other impurities including additives are discharged in the form of residuals; the process also can produce a plurality of products with good quality and varied viscosities, thereby bringing about great convenience for the preparation of product lubricating oil.

The invention belongs to the field of natural organic chemistry and relates to a method for enriching and purifying common phellinus fungus general flavone in common phellinus fungus by using a batch distillation-macroporous absorption resin coupling method. The method is characterized in that the common phellinus fungus general flavone is separated and purified by applying a macropore adsorption technology, the adsorption selectivity to the common phellinus fungus general flavone is better, the separation effect is remarkable, the extraction purity is high, the semi-finished product with more than 35 percent of the common phellinus fungus general flavone and the final product with above 90 percent of the common phellinus fungus general flavone can be obtained, and the defects of relatively lower conventional extraction rate and low extraction purity are overcome. Macroporous absorption resin with stable physicochemical property, large surface area, higher switching speed, high mechanical strength, strong contamination resistance and good thermal stability is selected, and the common phellinus fungus general flavone is selectively absorbed from a solution through physical adsorption, thus the method has the advantages of high adsorption, high deabsorption speed and larger adsorption capacity.

The invention belongs to the field of natural organic chemistry and relates to a method for enriching and purifying betulin in birch barks by utilizing a batch distillation-macroporous absorption resin method. The method has the advantages of good adsorption selectivity to betulin, quickness of adsorption and resolution, larger adsorption capacity, convenience and quickness of extraction, rich raw material source, low production cost, obvious separation effect and high extraction purity, can be used for obtaining a semi-finished betulin product with a content higher than 35 percent and a finished betulin product with a content higher than 98 percent and overcomes the defects of relatively lower conventional extraction ratio and low extraction purity. In the invention, macroporous absorption resin having stable physical and chemical properties, larger surface area, higher exchange speed, higher mechanical strength, strong antipollution capacity and good heat stability is used, which can selectively adsorb the betulin from the solution through physical adsorption, thus the invention has the advantages of quickness of adsorption and resolution and larger adsorption capacity.

The invention relates to a device and method for separating diisopropylbenzene isomeride by virtue of reduced pressure batch distillation. The device is a batch distillation tower consisting of a tower kettle, a material inlet, a distillation tower, a liquid distributor, a condenser, a catcher and a reflux tank, wherein one end of the reflux pipeline of the reflux tank is connected with the top of the distillation tower, and the other end of the reflux pipeline of the reflux tank is connected with a tower top product transition fraction tank and a tower top product tank; and simultaneously, avacuum tank is respectively connected with the catcher and the tower top product transition fraction tank as well as the tower top product tank through a buffer tank. When the pressure of the tower top is 132.0Pa-1320.0Pa, the temperature of the tower top is 80.0-82.0 DEG C and the temperature of the tower kettle is 90.0-95 DEG C, the variable reflux ratio operation is carried out: the operation reflux ratio when m-diisopropylbenzene with the purity above 99.0wt% is extracted is 7 / 1-9 / 1, and the operation reflux ratio when p-diisopropylbenzene with the purity of 99.0wt% is extracted is 15 / 1-20 / 1. The process has the characteristics of short operation time, low tower kettle temperature, less energy consumption and no thermosensitive reaction, and ensures that the purity of the separated product is high.

The invention relates to a vacuum batch distillation process and device for purifying peach aldehyde from a side discharge material. The vacuum batch distillation process comprises the following steps: adding a crude peach aldehyde product into a distilling column bottom at one time; vacuuming a distilling column; heating the column bottom to be 140-160 DEG C; keeping the column body at 50-80 DEG C; opening the column top to condense circulation water; when the column top has a reflux liquid, slowly enriching light components on the column top; when the temperature of the column top is stabilized to be 86-95 DEG C, acquiring 8-12wt% of capryl alcohol and transition fraction according to a variable reflux ratio; continuously implementing total reflux, and acquiring a peach aldehyde product from a low-level side discharge point when keeping the temperature of the column top at 85-95 DEG C and the temperature of a side at 120-140 DEG C; continuously implementing total reflux, rising the side acquiring position, and acquiring a residual peach aldehyde product from a high-level side discharge point. Compared with the prior art, on the basis of vacuum distillation, the vacuum batch distillation process adopts a vacuum side material discharge method, so that the yield of peach aldehyde is greatly increased, the distillation time is shortened, the energy consumption is reduced, the distillation efficiency is improved, and the purity of the product is greater than that of a column top discharge material.

The invention discloses a device and a method of utilizing catalytic distillation coupling technology to produce high-purity methylal. The device comprises a catalytic distillation tower I and a catalytic distillation tower II which are completely identical in inside structure and connected with each other. The catalytic distillation towers completely identical in structure are used, a method of enabling methanol and formaldehyde to be excessive alternately is used under action of a solid acid catalyst, both chemical balance and a co-boiling principle of methylal and methanol are broken, and the objective of refining high-purity methylal is achieved in one step. A high-purity methylal product is produced by adopting the catalytic distillation coupling method, so that the defects of other technologies like pressurization technology and extraction technology are overcome, and a new production technique having the advantages of mild process condition, short technical process, little investment, high efficiency, low consumption and environment-friendly production condition is created.

The invention discloses a device and process for purifying peach aldehyde by intermittent rectification under reduced pressure, which belongs to the separation and purification technology for synthesizing peach aldehyde. The device consists of a rectification tower, a condenser, a reflux tank, a surge tank, a vacuum pump, and a storage tank. The tower is equipped with high-efficiency packing. It is characterized in that the still of the rectification tower is a jacket column with a height-to-diameter ratio of 0.6 to 0.3. tube heater. The device is used to carry out the process of purifying peach aldehyde by intermittent distillation under reduced pressure. The pressure at the top of the tower is 133.3Pa ~ 1333Pa, and the temperature of the bottom of the tower is 150 ~ 180°C. Peach aldehyde with light components and qualified purity. The invention has the advantages that the tower kettle has the characteristics of small liquid film thickness, high evaporation efficiency, large heat transfer coefficient and short material residence time, the operation process of the tower is simple, and the product purity can reach more than 99 wt%.

The invention relates to a method for preparing high-purity m-xylylene diisocyanate (m-XDI). The method is characterized by comprising the following steps: feeding a crude product reaction liquid containing m-xylylene diisocyanate, a solvent and reaction byproducts into a light-phase flash evaporator operated at negative pressure for flash evaporation, and then feeding the above materials into a high-vacuum batch distillation tower for batch distillation, conducting refluxing with different reflux ratios for different fractions so as to finally obtain a qualified product. According to the method, the problem that heavy-phase components of the m-XDI reaction liquid are difficult to separate in a conventional rectification process is solved; and meanwhile, the self-agglutination phenomenon of the m-XDI reaction liquid containing the heavy-phase components in the rectification process is avoided, and the rectification yield of m-XDI can be improved.

The invention relates to a deep drying water removing method used for bipentene. The method includes adding to-be-dried bipentene and an entrainer into a batch distillation device, performing azeotrope water carrying, and collecting dipentene fraction through vacuum distillation; and adding the dipentene fraction into an adsorption column carrying activated molecular sieves to perform adsorption so that dried bipentene can be obtained. The method is mainly to meet the using requirements for the water content of a polymerization inhibitor during a production process of tetrafluoroethene; and the drying method is simple in technology and equipment, high in drying efficiency and fast in effect, so that the method is an ideal choice for industrialization, and has good application prospects.

The invention discloses a recycling and separating process of heavy component residual liquid in the carbonylation production process of acetic acid, belonging to the separation technical field of the organic chemical engineering. The process comprises the following steps: firstly, the residual liquid is sent to a wiped film evaporator to perform reduced pressure operation and remove high polymer heavy component; and secondly, light component enters a batch distillation device to obtain the products such as acetic acid, acetoxyacetic acid and ethylene glycol diacetate through separation and purification. The invention adopts the recycling and separating process of the acetic acid heavy component residual liquid; the flow is simple, the process is easy to operate; after the high polymer heavy component is removed, the residual liquid meets the requirements of environmental protection treatment; and the products with high added value can be effectively recycled, the recovery rate is more than 90% and the process is an efficient and environmentally friendly recycling and separating process.