The present disclosure provides methods for conducting chemical reactions and for conducting a multi-step chemical reactions using swellable organically modified silica (SOMS) as nanoreactors.

This invention relates to the field of contaminated plastic waste decomposition. More specifically, the invention comprises methods and systems to decompose contaminated plastic waste and transform it into value-added products.

This invention relates to the field of contaminated plastic waste decomposition. More specifically, the invention comprises methods and systems to decompose contaminated plastic waste and transform it into value-added products.

A process can be used for producing optical molding materials on the basis of methyl methacrylate (MMA). The MMA produced by an optimized method and the molding materials feature in particular a very low yellowness index. This MMA has been produced by direct oxidative esterification of methacrolein. An optimized workup of the reactor output from the oxidative esterification of methacrolein can be used for removing particularly discoloring byproducts. This process moreover has the advantage that fewer demands are placed on plant apparatus configuration.

A process can be used for producing optical molding materials on the basis of methyl methacrylate (MMA). The MMA produced by an optimized method and the molding materials feature in particular a very low yellowness index. This MMA has been produced by direct oxidative esterification of methacrolein. An optimized workup of the reactor output from the oxidative esterification of methacrolein can be used for removing particularly discoloring byproducts. This process moreover has the advantage that fewer demands are placed on plant apparatus configuration.

The present disclosure provides a fabric, a preparation method thereof and clothing formed therefrom. The preparation method includes the following steps: obtaining bio-based synthetic fiber chips from textile waste materials; obtaining extruded filaments from the bio-based synthetic fiber chips by adopting a spinning solution; and weaving and interlocking the extruded filaments with bio-based elastic fibers to obtain the fabric. The prepared fabric is obtained from the textile waste materials, so that waste recycling is realized, and the pollution of the textile wastes to the environment is avoided. The spinning solution is adopted in the preparation process of the fabric, so that the opacity and hydrophilicity of the fabric can be enhanced.

A diester-based compound is continuously prepared in a total of n reaction units serially connected, each reaction unit includes a reactor and layer separator. The preparation includes: supplying and esterifying a feed stream including a dicarboxylic acid and an alcohol into a first reactor to prepare a reaction product, and supplying a lower draw-off stream including the reaction product into reactors of rear reaction units; supplying an upper draw-off stream of the first reactor into a first layer separator, refluxing a lower draw-off stream including an alcohol from the first layer separator into the first reactor; and supplying an upper draw-off stream of at least one reactor of second to and nth reactors into each of the layer separators, splitting a portion of the lower draw-off stream including the alcohol from each of the layer separators, and refluxing only a portion of the split stream into each of the reactors.

A diester-based compound is continuously prepared in a total of n reaction units serially connected, each reaction unit includes a reactor and layer separator. The preparation includes: supplying and esterifying a feed stream including a dicarboxylic acid and an alcohol into a first reactor to prepare a reaction product, and supplying a lower draw-off stream including the reaction product into reactors of rear reaction units; supplying an upper draw-off stream of the first reactor into a first layer separator, refluxing a lower draw-off stream including an alcohol from the first layer separator into the first reactor; and supplying an upper draw-off stream of at least one reactor of second to and nth reactors into each of the layer separators, splitting a portion of the lower draw-off stream including the alcohol from each of the layer separators, and refluxing only a portion of the split stream into each of the reactors.

A synthesis method of alpha-hydroxycarboxylic acid ester is provided. In the method, an alpha-hydroxycarboxylic acid and an alcohol are taken as raw materials, one or more of boric acid, metaboric acid, pyroboric acid, and boric anhydride is taken as a catalyst, and one of cyclohexane, toluene, benzene, and alcohols is taken as a water-carrying agent. A reaction temperature is kept in range of 100-160° C., produced water is separated by an oil-water separator, and the alpha-hydroxycarboxylic acid ester is synthesized directly. After an esterification reaction, the water-carrying agent and unreacted alcohol are distilled by vacuum fractionation to obtain a crude product, and refined alpha-hydroxycarboxylic acid ester is obtained by performing neutralization, water washing, and vacuum rectification on the crude product. The alpha-hydroxycarboxylic acid ester prepared by the method has high purity and light color, and can be used as green solvent, surfactant, chiral resolution agent and plasticizer.

A synthesis method of alpha-hydroxycarboxylic acid ester is provided. In the method, an alpha-hydroxycarboxylic acid and an alcohol are taken as raw materials, one or more of boric acid, metaboric acid, pyroboric acid, and boric anhydride is taken as a catalyst, and one of cyclohexane, toluene, benzene, and alcohols is taken as a water-carrying agent. A reaction temperature is kept in range of 100-160° C., produced water is separated by an oil-water separator, and the alpha-hydroxycarboxylic acid ester is synthesized directly. After an esterification reaction, the water-carrying agent and unreacted alcohol are distilled by vacuum fractionation to obtain a crude product, and refined alpha-hydroxycarboxylic acid ester is obtained by performing neutralization, water washing, and vacuum rectification on the crude product. The alpha-hydroxycarboxylic acid ester prepared by the method has high purity and light color, and can be used as green solvent, surfactant, chiral resolution agent and plasticizer.