7 results about "Batch distillation" patented technology

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 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.

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.

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.