Abstract: Provided is a method for purifying sucralose-6-acetate, including: preparation: providing a saturated solution of crude sucralose-6-acetate in ethyl acetate that is heated to a predetermined temperature; gradient crystallization: subjecting the saturated solution to multiple cooling crystallization and filtration, and collecting crude sucralose-6-acetate obtained after the multiple cooling crystallization and filtration, where during each cooling crystallization process, a low-polarity solvent is added dropwise to the saturated solution to reduce a polarity of the saturated solution during crystallization step by step; and purification: subjecting a collected crude sucralose-6-acetate to recrystallization for purification by using a mixed solution of ethyl acetate and the low-polarity solvent to obtain fine sucralose-6-acetate of high purity.

Abstract: Disclosed in the present disclosure is a purification method for sucralose-6-ethyl ester, and the method comprises: a secondary water boiling step: taking a sucralose-6-ethyl ester mother liquor, which has been subjected to boiling with water and a negative pressure treatment, adding a predetermined proportion of water to the sucralose-6-ethyl ester mother liquor, fully stirring and heating for boiling with water, and after stirring and boiling with water for a predetermined time, carrying out solid-liquid separation to obtain a secondary water-boiled mother liquor in which sucralose-6-ethyl ester is dissolved; a phase separating extraction step: leaving the secondary water-boiled mother liquor to stand for phase separation, taking the separated upper phase, extracting with an alkane extractant at a predetermined temperature, and removing residual white oil in the upper phase; a recrystallizing purification step: evaporating a lower-layer effluent obtained from extraction, so as to obtain a solid, and purifyi

Abstract: The present disclosure relates to the field of lithium battery separators, and aims to provide a battery separator and a coating process thereof, a coating system and a battery. The coating process includes: initial heat setting of a polyolefin membrane, online coating of the polyolefin membrane, and heat setting of a coating membrane. The coating system includes a plurality of drying ovens disposed in a travel route of heat setting of a polyolefin membrane, and a coating apparatus for coating a coating slurry on the polyolefin membrane, which is disposed at a spacing position of adjacent drying ovens. When the online coating flow is disposed before the end of the heat setting of the polyolefin membrane, the polyolefin base membrane and the coating slurry are dried by using the temperature of the heat setting drying oven of the polyolefin membrane.

Abstract: Disclosed is a method for purifying sucralose, sequentially including: adding sucralose to ultrapure water, heating the resulting mixture for dissolution to obtain a dissolved solution, filtering the dissolved solution to obtain a filtrate, and then extracting the filtrate with an extraction solvent to remove non-polar impurities; subjecting the extracted recrystallization solution to concentration by evaporation to obtain a concentrated recrystallization solution with a preset concentration, and leaving the concentrated recrystallization solution to stand at a preset temperature for a preset time to produce a sucralose crystal nucleus in the concentrated recrystallization solution; subjecting the concentrated recrystallization solution containing the sucralose crystal nucleus to programmed cooling to obtain a recrystallization solution with a large amount of a sucralose crystal; and centrifuging the recrystallization solution with a large amount of a sucralose crystal to obtain a solid, and subjecting the so

Abstract: The invention provides a DMF recycling method, the method comprises: neutralization step, extraction and crystallization step, layering step, evaporation step; a condensate obtained by evaporation of the upper layer liquid phase is recycled into the anti-solvent, a concentrated solution obtained by evaporation of the upper layer liquid phase and a condensate obtained by evaporation of the lower layer liquid phase are mixed to obtain a crude DMF solution for recycling of DMF. The recycling method overcomes the problem that acetic acid in the stock solution corrodes the equipment and produces impurities, so as to improve the recycling purity and reduce the equipment cost.

Abstract: Disclosed in the present invention is an isolating membrane of an electrochemical device, comprising a modified porous base membrane and a functional layer arranged on the surface of at least one side of the modified porous base membrane. The functional layer contains slurry of organic matter and inorganic matter compounds, and the modified porous base membrane contains particles of a lithium-containing conductive ion compound. According to the present invention, the lithium-containing conductive ion compound is prepared by adopting a sol-gel-hydrothermal method, and small-particle-size particles of the lithium-containing conductive ion compound are embedded into the isolating membrane base membrane, so that the defects of poor ionic conductivity and poor wettability of an existing isolating membrane are overcome, and moreover, the isolating membrane has good adhesion and heat resistance due to the coated functional layer.

Abstract: Disclosed are a coating slurry for preparing a separator for an electrochemical device, comprising at least one polymer having an intrinsic viscosity ranging from 0.5 to 3.0 mL/g, at least one inorganic filler, and at least one solvent; a method for preparing the coating slurry; and a method for preparing a separator for an electrochemical device using the coating slurry; as well as a separator and an electrochemical device comprising the separator.

Abstract: A method for preparing a lithium-ion battery separator is disclosed. The method comprises: cooling and shaping a liquid-phase stabilization system containing polyethylene, stretching to enlarge pores, extracting with a solvent, and heat-setting to obtain a lithium-ion battery separator, wherein the stretching includes pre-stretching and synchronous bidirectional stretching, and the pre-stretching is completed before the synchronous bidirectional stretching.

Abstract: Disclosed are a coating slurry for preparing a separator for an electrochemical device, comprising at least one polymer having an intrinsic viscosity ranging from 0.5 to 3.0 mL/g, at least one inorganic filler, and at least one solvent; a method for preparing the coating slurry; and a method for preparing a separator for an electrochemical device using the coating slurry; as well as a separator and an electrochemical device comprising the separator.

Abstract: Disclosed herein are a coating slurry for preparing a separator, comprising at least one copolymer having a crystallinity degree ranging from 30% to 70%, at least one thickening agent, at least one binder, and water, wherein the at least one copolymer comprises a first structural unit and at least one second structural unit; a method for preparing the coating slurry disclosed herein; a method for preparing separators with the coating slurry disclosed herein; a separator for an electrochemical device prepared by the method disclosed herein; as well as an electrochemical device comprising the separator.

Abstract: Disclosed are a separator for an electrochemical device, comprising a porous base membrane and a coating layer being formed on at least one side of the porous base membrane, wherein the coating layer comprises polybenzimidazoles having a weight average molecular weight ranging from 5×103 to 1×106; as well as an electrochemical device including the separator and a method for making the separator.

Abstract: A method for preparing a lithium-ion battery separator is disclosed. The method comprises: cooling and shaping a liquid-phase stabilization system containing polyethylene, stretching to enlarge pores, extracting with a solvent, and heat-setting to obtain a lithium-ion battery separator, wherein the stretching includes pre-stretching and synchronous bidirectional stretching, and the pre-stretching is completed before the synchronous bidirectional stretching.

Abstract: A method comprising: A. forming a consortium blockchain network using domain network nodes and selecting committee members from top-level domain nodes; B. the committee member who received most votes packs the genesis block and generates a random number; C. the housekeeper having the same number as the random number packs the current block and generates a random number for selecting a next housekeeper to pack the next block, each block is approved by more than half of the committee members; D. during the duty cycle, each housekeeper takes turns packing blocks and generating random numbers and the process is repeated. If a block is not approved, the housekeeper with the next number is requested to repack the block; and E. the last random number generated by a housekeeper before the duty cycle ends is used to select the housekeeper to pack the first block of the next duty cycle.

Abstract: The present disclosure provides a composite porous separator and an electrochemical device. The composite porous separator comprises: a composite porous substrate; and a composite porous coating coated on at least one surface of the composite porous substrate. The composite porous substrate comprises a filler A and a polymer matrix, the filler A is at least one selected from a group consisting of inorganic particles and organic particles; the composite porous coating comprises a filler B and an adhesive, the filler B is at least one selected from a group consisting of inorganic particles and organic particles. The electrochemical device has the above composite porous separator. The present disclosure improves the thermal stability of the composite porous separator, and improves the anti-deformation capability and the capacity retention rate of the electrochemical device, and further improves the cycle performance and the low temperature dynamic performance of the electrochemical device.

Abstract: Disclosed are an optically pure compound having formula I, its pharmaceutically acceptable salt and its pharmaceutically acceptable solvate, and a use thereof in manufacturing medicaments and pharmaceutical compositions. A process for preparing the compound defined therein is also provided.

Abstract: Disclosed are an optically pure compound having formula I, its pharmaceutically acceptable salt and its pharmaceutically acceptable solvate, and a use thereof in manufacturing medicaments and pharmaceutical compositions. A process for preparing the compound defined therein is also provided.

Abstract: Disclosed are an optically pure compound having formula I, its pharmaceutically acceptable salt and its pharmaceutically acceptable solvate, and a use thereof in manufacturing medicaments and pharmaceutical compositions. A process for preparing the compound defined therein is also provided.