11results about How to "Reduce self-aggregation" patented technology

The invention discloses a super-hydrophilic strong-alkali-resistant polyphenylene sulfide diaphragm as well as a preparation method and application thereof, the super-hydrophilic strong-alkali-resistant polyphenylene sulfide diaphragm comprises polyphenylene sulfide fibers and a hydrophilic layer of a modified polydopamine polymer, and the thickness of the hydrophilic layer is 40-50nm; the polyphenylene sulfide diaphragm is immersed in an alkaline electrolyte for 120 hours, the water contact angle between the polyphenylene sulfide diaphragm and an alkaline wetting solution is not greater than 5 degrees, and the wetting water absorption time between the polyphenylene sulfide diaphragm and the alkaline wetting solution is not greater than 0.1 s; under the working voltage of 1.8 V and the alkaline electrolyte, the hydrogen content in the anode side gas of the alkaline electrolytic cell using the polyphenylene sulfide diaphragm is not higher than 0.5%, and the alkaline wetting solution and the alkaline electrolyte are both KOH solutions with the mass concentration of 30%-50%. The hydrophilic layer of the modified polydopamine polymer is prepared through a simple and convenient process, the alkali-resisting hydrophilicity of the polyphenylene sulfide diaphragm is improved, the problems that the hydrophilic performance of an existing hydrophilic layer in an alkaline electrolytic bath is degraded and unstable are solved, and the super-hydrophilic polyphenylene sulfide diaphragm stably used in the alkaline environment is prepared.

The present application discloses a method for preparing a lithium-ion battery separator and the separator and application thereof, belonging to the field of battery materials. The method comprises the following steps: adding a phase transfer catalyst to an aqueous solution containing a polymer with an ultra-high degree of polymerization for reaction, then mixing with acrylonitrile to obtain a mixed system, performing an electrocatalytic etherification reaction under the catalytic conditions of a platinum-palladium catalytic electrode, precipitating, filtering, drying, dissolving, spinning, and obtaining the lithium-ion battery separator. The prepared separator has extremely strong electrolyte wettability, and the separator prepared by the electrostatic spinning process has an excellent pore structure, improves the transmission speed and migration number of lithium ions, induces uniform deposition of lithium ions, effectively inhibits dendrite growth, improves battery rate discharge performance and high rate cycle performance, improves the electrochemical performance and cycle life of lithium-ion batteries, and the separator has huge application potential in the field of lithium-ion battery separators.

The application discloses a method for continuously preparing high-purity sulfolane, and belongs to the technical field of organic synthesis. By introducing a solvent and a stable free radical type polymerization inhibitor, the self-polymerization of butadiene is effectively inhibited. By adopting a cooling crystallization mode to remove sulfur dioxide, the thermal decomposition of sulfolene sulfone is avoided, high yield and high purity are realized, the service life of a hydrogenation catalyst is not affected, and the catalyst can be completely reused. The cooling crystallization also realizes the separation of the polymerization inhibitor and sulfolene sulfone. The polymerization inhibitor is dissolved in the solvent and recycled, and does not enter the hydrogenation system, so that the final sulfolane product has a purity of above 99.9% and has no chromaticity problem. The process saves energy consumption, the solvent has wide universality, operation is simple, the process is safe and environment-friendly, easy to scale up, and meets the green production requirements.

The invention relates to the technical field of organic synthesis, in particular to a reactive distillation device and method for continuously producing low-carbon unsaturated acid-high-carbon alcohol ester. According to the device provided by the invention, the reactive distillation tower, the primary condenser and the reboiler are connected through the pipeline, and moisture generated in the reactive distillation region is removed in time by adopting a reactive distillation mode, so that the high-carbon alcohol conversion rate is further improved; furthermore, the tower kettle ester product is externally circulated and returned into the tower, so that the product selectivity is improved; meanwhile, condensate is refluxed at the tower top, so that the yield of ester products is improved.

The utility model relates to the technical field of chemical synthesis, in particular to a polymerization inhibition reaction device for synthesizing butyl acrylate, the polymerization inhibition reaction device is provided with an acrylic acid storage tank and an n-butyl alcohol storage tank, the n-butyl alcohol storage tank is connected with a reactor through an n-butyl alcohol conveying pump and a pipeline, and the reactor is provided with a solid feeding port; the acrylic acid storage tank is connected with an intermittent pulse type emitter arranged at the top of the reactor through an acrylic acid conveying pump and a pipeline, an online monitoring system is arranged at the bottom of the reactor, the intermittent pulse type emitter and the online monitoring system are both connected with a controller, and the intermittent pulse type emitter and the online monitoring system are connected with the controller through the combined action of the intermittent pulse type emitter and the online monitoring system. Dynamic feeding of acrylic acid is realized, and the concentration of acrylic acid in unit time is effectively reduced, so that the risk of self-polymerization and other-polymerization of acrylic acid is remarkably reduced, and the safety and stability of reaction are improved; the production of a high-quality butyl acrylate product is facilitated, and the production efficiency and the economic benefit are improved.

The invention discloses a preparation method and application of bio-based itaconic acid diglycidyl ester. The preparation method comprises the following steps: carrying out first reaction on itaconic acid and a sodium source at room temperature to prepare sodium itaconate; and carrying out a second reaction on a mixed reaction system at least containing the sodium itaconate, epoxy chloropropane, a catalyst and an anti-auto-agglutination agent to prepare the bio-based itaconic acid diglycidyl ester. The main raw materials for preparing the itaconic acid diglycidyl ester are bio-based sources, no organic solvent is needed in the reaction process, few reaction byproducts are generated, the prepared itaconic acid diglycidyl ester is high in purity and higher in epoxy value, the grafting compatilizer higher in epoxy value and grafting rate is easier to prepare, and the preparation method is suitable for industrial production. And the composition has a better compatibility effect.

This invention discloses a method for synthesizing 2-heptanone, comprising continuously feeding n-butyraldehyde into an alkaline reaction system. The reaction system includes activated acetone and a hydrogenation catalyst, with acetone in excess relative to n-butyraldehyde. In this invention, n-butyraldehyde is continuously fed into an alkaline reaction system comprising a hydrogenation catalyst and activated acetone in a high-pressure reactor under a hydrogen atmosphere. By controlling the feeding rate of n-butyraldehyde, it is rapidly diluted to reduce self-polymerization and the generation of byproducts, especially high-boiling-point substances, thereby improving the selectivity of MAK (methyl ethyl ether). By controlling the total amount of n-butyraldehyde added, the reaction system is kept in excess of acetone to improve the conversion rate of n-butyraldehyde. This invention achieves a one-step synthesis of 2-heptanone in a reactor, with high reaction efficiency, short reaction time, high MAK selectivity, easy purification, easy material recovery and reuse, low energy consumption, and ease of industrialization.

This invention belongs to the field of divinylbenzene preparation and storage technology, specifically relating to a method for storing divinylbenzene to prevent self-polymerization. The method includes the following steps: S1, adding divinylbenzene into a storage tank; wherein, a cooling coil is provided on the outer wall of the storage tank, and a gap exists between the outer wall of the cooling coil and the outer wall of the storage tank. Therefore, storing divinylbenzene using a storage method with a gap between the outer wall of the cooling coil and the outer wall of the storage tank has the effect of extending the storage time of divinylbenzene and can slow down the severe self-polymerization phenomenon of divinylbenzene in the storage tank.

The invention belongs to the technical field of organic synthesis, and particularly relates to a continuous production method and device of isobutylbenzene. The continuous production method comprises the steps that a raw material A and a raw material B are continuously introduced into a reactor for a side chain alkylation reaction, the raw material A comprises methylbenzene and a catalyst, the raw material B comprises propylene, obtained reaction liquid containing isobutylbenzene is continuously discharged and subjected to solid-liquid separation, solid and first feed liquid are obtained, and the solid is the recycled catalyst and is reused; carrying out first rectification on the first feed liquid to obtain second feed liquid and a first gas component; the first gas component is recycled propylene; carrying out second rectification on the second feed liquid to obtain third feed liquid and a second gas component; the second gas component is recycled methylbenzene; and carrying out third rectification and liquefaction on the third feed liquid to obtain isobutylbenzene. Compared with a traditional kettle type production process, the method has the advantages that the reaction pressure is low, the reaction temperature is easy to adjust, side reactions are reduced, and the method is more efficient and stable.

The invention discloses a novel catalytic process method for 2, 5-dimethoxy-4-chloracetylacetanilide, and belongs to the field of chemical synthesis. The preparation method comprises the following steps: mixing 2, 5-dimethoxy-4-chloroaniline, an ionic liquid catalyst, a reaction mother solution and diketene, reacting for 1-1.5 hours at the reaction temperature of 10-20 DEG C, and cooling, filtering and drying after the reaction is completed to obtain a finished product. According to the invention, 2, 5-dimethoxy-4-chloroaniline and diketene are taken as raw materials, one-step synthesis is carried out by adopting acylation reaction catalyzed by the ionic liquid, the target product selectivity is high, and pollution is less during post-treatment; due to the introduction of the ionic liquid catalyst, the electrophilicity of the aromatic ring compound is improved, the reaction is easier to carry out, and the ionic liquid catalyst is green, non-toxic, recyclable and easy for industrial production; and the mother liquor can be continuously used as an indiscriminate mother liquor for next reaction.

The application relates to the technical field of supramolecular, in particular to a supramolecular salicylic acid and a preparation method and application thereof, the preparation method comprises the following steps: mixing salicylic acid, a ligand and an auxiliary agent, stirring and ultrasonicating to obtain the supramolecular salicylic acid; the ligand comprises L-lysine or arginine; and the molar ratio of the salicylic acid to the ligand is 1:1. The supramolecular salicylic acid prepared by mixing the salicylic acid and the ligand in a certain proportion and dissolving them in the auxiliary agent improves the solubility, stability and permeability of the salicylic acid. The supramolecular salicylic acid prepared by the application has good solubility and stability, strong permeability, small skin irritation, a simple and environment-friendly preparation method and is suitable for large-scale production.