14 results about "Batch distillation" patented technology

The invention relates to a batch rectification system based on intelligent control, and relates to the technical field of batch rectification. A data acquisition module; the data acquisition module is used for acquiring temperature, pressure, flow and material concentration data in real time; the control module is used for receiving various data of the data acquisition module; a model prediction control algorithm is built in the control module; according to the model prediction control algorithm, a rectification process dynamic model is established, a current system state and a set control target are combined, an optimal control strategy is obtained through rolling optimization calculation, and a control instruction is sent by an execution mechanism based on the optimal control strategy; an execution mechanism; the touch display screen is connected with the control module; the operation parameters of the rectification system are displayed in real time.

The utility model belongs to the technical field of chemical engineering experiments, and particularly relates to a batch rectification device for purifying 1, 5-dimethyl-2-pyrrolidone, which comprises a workbench, the top of the workbench is fixedly connected with a motor; the output end of the motor is fixedly connected with a turntable; a sliding groove is formed in the end of the rotating disc. According to the intermittent rectification and purification device, the heating device is arranged, so that when the intermittent rectification and purification device rotates, internal liquid rapidly rotates, then the internal liquid is heated through the heating device, and the contact area between the liquid and gas can be increased through rotation, so that the mass transfer process between the gas and the liquid is favorably promoted, and the rectification efficiency is improved; in the distillation process, internal steam is guided through the flow guide pipe, and then is condensed through the condenser to finish liquid collection, so that the production quality of 1, 5-dimethyl-2-pyrrolidone is improved.

In order to solve the problems of high energy consumption and high equipment cost in the prior art of purifying crude ethylene glycol produced by the alcoholysis process of ethylene carbonate, the present invention discloses a purification method, purification system and application of crude ethylene glycol. The method comprises: subjecting the crude ethylene glycol to vacuum distillation, collecting the materials in the bottom of the tower to obtain ethylene glycol product I, and subjecting the materials at the top of the tower to vacuum distillation to obtain ethylene glycol product II. The present invention adopts a combined process of a vacuum continuous distillation tower and a vacuum intermittent distillation tower, and utilizes the characteristics that ethylene glycol and ethylene carbonate will form azeotropes within a certain pressure range. A small part of ethylene glycol in the feed is used as an entrainer to entrain the heavy component impurity ethylene carbonate that is difficult to separate from the top of the tower. Most of the high-purity polyester-grade ethylene glycol can be obtained at the bottom of the vacuum distillation tower. Through the pretreatment in the previous step, the processing capacity of the subsequent intermittent distillation tower can be greatly reduced, thereby reducing operating costs and equipment investment.

This application relates to a batch distillation system based on intelligent control, belonging to the technical field of batch distillation. It includes: a distillation column; a data acquisition module, which is used to collect temperature, pressure, flow rate and material concentration data in real time; a control module, which receives various data from the data acquisition module, and the control module is built-in with a model predictive control algorithm. The model predictive control algorithm obtains the optimal control strategy through rolling optimization calculation by establishing a dynamic model of the distillation process, combining the current system state and the set control target, and issues a control instruction to the actuator based on the optimal control strategy; an actuator; a touch screen display, which is connected to the control module and displays the operating parameters of the distillation system in real time.

This invention discloses a batch distillation purification method for NMP electronic waste liquid, comprising: after the NMP electronic waste liquid is fed into a batch distillation column, obtaining the initial process parameters of the batch distillation column; inputting the initial process parameters into a constructed batch distillation column operating model to obtain target operating parameters; and purifying the NMP electronic waste liquid according to the target operating parameters to obtain NMP product. Implementing this invention enables the automatic purification of NMP electronic waste liquid with different NMP contents using a batch distillation process, resulting in low cost, improved NMP product recovery rate and purity, and suitability for the lithium battery industry where NMP-containing electronic waste liquid is low and its composition is unstable.

This invention provides a pH adjustment method for recovering PMA from waste PMA diluent in a batch distillation column. The method includes: after the waste PMA diluent has been fed into the bottom of the batch distillation column and before formal distillation, adding 99% industrial acetic acid diluted 1000 times to the bottom of the column to precisely adjust the pH value of the waste PMA diluent to 6.0–6.5. After stirring evenly, distillation is performed to recover PMA. The amount of acetic acid used is calculated using a specific formula. This invention effectively inhibits PMA hydrolysis and saponification reactions by defining the optimal pH range, selecting a mild acetic acid adjuster, and accurately calculating the dosage, thereby improving PMA recovery rate and product purity, reducing equipment corrosion risks, and providing a practical operating procedure. It is applicable to waste PMA diluent with an initial pH value greater than 6.5, meets the needs of industrial-scale recycling, and combines environmental value with economic benefits.

The invention discloses an automatic reflux control device and method for intermittent vacuum distillation of high-purity α-thiophene derivatives. The device comprises a tower kettle reboiler, a distillation tower, a tower top condenser, a reflux distributor and a receiving tank, and also comprises a reflux control system composed of a PID cascade control unit and an intermittent distillation tower vacuum control system composed of a PID single-loop feedback control unit. The invention effectively separates a low-boiling point fore fraction on the basis of maintaining the stability of the distillation tower system, so as to achieve the purpose of producing high-purity α-thiophene derivatives by distillation.

The invention discloses a phosphorus trichloride secondary batch rectification process for refining high-purity red phosphorus, and belongs to the field of red phosphorus production. The process comprises the following steps: purifying outsourced PCl3 with the purity of 99% to 99.99% through first-stage batch rectification (85-95 DEG C, reflux ratio of 0.3, 3 hr), directly introducing the purified PCl3 into a second-stage batch rectification tower (the constant temperature of 90-95 DEG C is 3.5 hr, reflux ratio of 0.45) to obtain PCl3 with the purity of 99.99995%, and returning second-stage rectification raffinate to a first-stage tower for recycling. According to the process, intermediate storage is omitted, the system risk is reduced, the PCl3 purification efficiency and purity are improved, and a high-quality raw material is provided for subsequent high-purity red phosphorus preparation.

This invention relates to the field of batch distillation technology, specifically to a directional ultrasound-enhanced batch distillation apparatus and method. The apparatus includes a distillation vessel body, an ultrasonic generator, and an ultrasonic vibration system mounted on the outer wall of the distillation vessel body. The ultrasonic vibration system includes at least one set of transducers, each set comprising multiple transducers uniformly distributed along the axial direction of the distillation vessel body. Each transducer is electrically connected to the ultrasonic generator, and a parabolic focusing hood is connected to the front end of each transducer. The opening of each parabolic focusing hood faces the outer wall of the distillation vessel body. The ratio of the focal length of each parabolic focusing hood to the radius of the distillation vessel body is 0.5-0.75. This invention achieves directional focusing of ultrasonic energy by controlling the ratio of the focusing hood's focal length to the inner diameter of the distillation vessel. Combined with a multi-transducer array layout, it achieves a synergistic improvement in energy utilization, separation purity, and temperature uniformity.

The invention relates to a process and a device for separating higher aliphatic alcohol from rice bran wax by digital simulation and optimization assisted batch distillation. The high-vacuum batch distillation technology is used for separating and purifying higher aliphatic alcohol, single-tower operation is adopted, the equipment investment is small, the operation is flexible, the raw material application range is wide, auxiliary operation is simulated and optimized, the reflux ratio and the distillate amount of each fraction section are mainly controlled, the composition required by each fraction section is obtained, on-demand production is realized, and the production cost is reduced. Stable operation of the rectification process is maintained by controlling the pressure difference between the tower top and the tower bottom, the production process is easy and convenient to control, and the automation and intelligence level is high; a condenser at the top of the rectifying tower adopts an evaporative condenser, water is used as an evaporation medium for material condensation, and the boiling point of the water is 100 DEG C and is higher than the melting point of the higher fatty alcohol, so that the problem of blockage caused by easy crystallization of the higher fatty alcohol due to higher melting point is solved. Equipment is simple, operation is flexible, raw material application range is wide, and operation is simple and reliable.

This invention belongs to the field of solvent recovery and purification technology, specifically relating to a method for purifying high-free-amine NMP wastewater based on a composite treatment agent. The method targets NMP wastewater with a free amine content greater than 500 ppm. First, a primary treatment agent composed of an amino-functionalized ionic liquid and an organic carboxylate is sequentially added, followed by an auxiliary complexing agent composed of a thiol compound and porous nano-alumina for fractional pretreatment. Then, a two-stage pressure-controlled dehydration distillation is performed. Finally, under specific purity and impurity concentration conditions, a side stream is initiated for collection, with periodic reflux flow disturbances and closed-loop flow control based on real-time purity implemented during collection. This method can be efficiently operated on conventional batch distillation equipment, enabling deep purification of high-free-amine NMP wastewater and obtaining high-quality recovered NMP.

This invention relates to a batch distillation system and method for extracting fragrances and flavorings from chemical by-products. The batch distillation feedstock is stored in a condensate tank at the top of the column. During the distillation stage, the light components in the condensate tank are continuously purified, while the heavy components are continuously collected from the bottom of the batch distillation column. The intermediate components containing fragrances and flavorings are continuously purified in this process. By continuously collecting the heavy components, and by continuously feeding the feedstock from the condensate tank rather than having it remain in the bottom of the column during a single feed, repeated heating is avoided. This prevents the charring or decomposition of heavy components caused by high-temperature heating of the bottom material, which can significantly affect the aroma of the fragrance and flavoring products. This method is more conducive to obtaining intermediate components containing fragrances and flavorings with higher purity and acceptable aroma. The fragrance and flavoring products obtained using the distillation system and method of this invention have higher purity, are easier to meet aroma standards, and have a higher pass rate, resulting in higher product efficiency.

The present invention relates to the field of chemical production, and discloses a preparation process of methyltrimethoxysilane, wherein methanol vaporized from a vaporizer and monomethyltrichlorosilane are introduced into an esterification tower in proportion to generate an esterification reaction, methanol is introduced into the esterification tower from the lower part of the esterification tower, monomethyltrichlorosilane is sprayed downward from the upper part of the esterification tower, and the reaction product of the esterification reaction liquid is introduced into a cyclone gas-water separator for gas-liquid separation, a part of the liquid separated by the cyclone gas-water separator is refluxed to the bottom of the esterification tower, and the other part enters a neutralization reactor containing a sodium methoxide solution from the lower end of the cyclone gas-water separator for neutralization, the reaction liquid is filtered and desalted to obtain a MTMS crude product, the crude product enters a distillation tower for intermittent distillation, and when the MTMS at the top of the tower reaches a certain content, the distillation product at the top of the tower passes through a glass tube containing a dechlorination desiccant, and is cooled and collected to obtain a neutral MTMS finished product. The present invention has the advantages and effects of high purity of methyltrimethoxysilane and good effect when used.

This invention discloses a method and apparatus for controlling the process and performing online automatic detection in the refining of crude phenol. The method includes separating the crude phenol raw material using a continuous distillation system, then feeding it into a batch distillation system for further refining using chemical treatment; using a sample sampling circulation system to collect the top distillate from each distillation column in real time, and sending it to a sample detection and analysis circulation system and an automatic pigment detection device for online analysis; and using a DCS control system to automatically adjust the reflux ratio and yield of the distillation columns based on feedback data on component content, moisture content, and color. The apparatus consists of a sample sampling circulation system, a sample detection and analysis circulation system, an automatic pigment detection device, and a DCS control system. This invention achieves precise separation of crude phenol components through the coupling of chemical treatment and distillation processes and closed-loop control throughout the entire process, improving product purity, yield, and color stability, while reducing production safety risks.