3results about How to "Prevent purity" 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 application discloses a noise label robust training method and device for an image recognition model, and belongs to the technical field of image recognition model training, and comprises the following steps: inputting image training samples into a deep neural network for feature extraction; constructing a multi-granularity granular ball structure in a feature space based on a feature vector; performing hierarchical correction on the labels of the image training samples; performing label propagation in the granular ball, and calculating the propagation confidence distribution and consistency score of each image sample; screening a clean sample subset according to the consistency score, and iteratively training the deep neural network to update network parameters. Through the adaptive multi-granularity granular ball division mechanism, the application can fully depict the local structure characteristics of data in the feature space, avoid the problems of excessive fragmentation or insufficient purity caused by traditional fixed-granularity clustering in a high-noise environment, and provide a stable and reliable structure prior for subsequent label correction and information propagation.

This invention discloses a catalytic synthesis method for 1-arylmethyl-4-arylmethyl-3-hydroxypyrrole-2-( 5H A method for reacting 1-arylmethyl-4-arylmethylenepyrrole-2,3-dione compounds and diethyl phosphonate in an organic solvent under the presence of a base catalyst undergoes a Michael addition and a 1,4-P-Brook rearrangement tandem reaction. Sodium ethoxide is then added for hydrolysis to yield 1-arylmethyl-4-arylmethyl-3-hydroxypyrrole-2,3-dione compounds and their derivatives. 5H )-ketone. This invention achieves 3-hydroxypyrrole-2-( )-ketone in one step through a series of reactions in a one-pot reaction mode. 5H Alkylation of ketones at the C(4) position: The catalyst used is mild and readily available, enabling highly efficient catalytic reactions with good yields of the target product. It is both economical and environmentally friendly, making it suitable for large-scale applications.