5results about How to "Reduce self-aggregation" patented technology

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.

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 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.