The present disclosure provides a synthesis method of a g-C.sub.3N.sub.4/C composite material based on a hollyhock stalk, including the following steps: (1) pretreatment of hollyhock stalks; and (2) fabrication of the g-C.sub.3N.sub.4/C composite material. In this method, with the hollyhock stalk as a carbon skeleton, g-C.sub.3N.sub.4 is spread on a template surface to form a laminated layer, and a composite system with a special structure is constructed. Compared with pure phase g-C.sub.3N.sub.4, the composite material substantially increases specific surface area and has a clear interface; the carbon skeleton not only functions as a rigid support, but also increases the electron transfer efficiency of the composite material, thereby improving the separation efficiency of photogenerated carriers and the utilization rate of visible light. Raw materials used in the method are inexpensive and environmentally friendly, which can be used for industrial production and bulk production of eco-friendly materials for harnessing environmental organic pollutants.

The present invention relates to a process for preparing a double metal cyanide catalyst (DMC) comprising the reaction of an aqueous solution of a cyanide-free metal salt, an aqueous solution of a metal cyanide salt, an organic complex ligand and a complex-forming component, to form a dispersion, wherein the reaction is effected using a mixing nozzle and wherein the process temperature of the dispersion during the reaction is between 26° C. and 49° C. The subject matter of the invention further encompasses double metal cyanide catalysts (DMC) obtainable in accordance with the process according to the invention and also the use of the DMC catalysts for the preparation of polyoxyalkylene polyols.

The present invention relates to a process for preparing a double metal cyanide catalyst (DMC) comprising the reaction of an aqueous solution of a cyanide-free metal salt, an aqueous solution of a metal cyanide salt, an organic complex ligand and a complex-forming component, to form a dispersion, wherein the reaction is effected using a mixing nozzle and wherein the process temperature of the dispersion during the reaction is between 26° C. and 49° C. The subject matter of the invention further encompasses double metal cyanide catalysts (DMC) obtainable in accordance with the process according to the invention and also the use of the DMC catalysts for the preparation of polyoxyalkylene polyols.

A method of manufacturing a poly(ether-carbonate) polyol comprises a polymerization stage that includes polymerizing carbon dioxide and at least one alkylene oxide, with a starter, in the presence of a double metal cyanide polymerization catalyst and a catalyst promoter that is devoid of halide anions and cyanide. The catalyst promoter is separate from the double metal cyanide polymerization catalyst.

A method of manufacturing a poly(ether-carbonate) polyol comprises a polymerization stage that includes polymerizing carbon dioxide and at least one alkylene oxide, with a starter, in the presence of a double metal cyanide polymerization catalyst and a catalyst promoter that is devoid of halide anions and cyanide. The catalyst promoter is separate from the double metal cyanide polymerization catalyst.

Embodiments relate to a method of producing a modified double metal cyanide complex, a method of producing a monol or polyol that includes providing the modified double metal cyanide complex, an alkylene oxide polymerization process that includes providing the modified double metal cyanide complex, a batch, semi-batch, or continuous manufacturing process that includes providing the modified double metal cyanide complex, and a polyether polyol prepared using the batch, semi-batch, or continuous manufacturing process that includes providing the modified double metal cyanide complex.

Embodiments relate to a method of producing a modified double metal cyanide complex, a method of producing a monol or polyol that includes providing the modified double metal cyanide complex, an alkylene oxide polymerization process that includes providing the modified double metal cyanide complex, a batch, semi-batch, or continuous manufacturing process that includes providing the modified double metal cyanide complex, and a polyether polyol prepared using the batch, semi-batch, or continuous manufacturing process that includes providing the modified double metal cyanide complex.

Embodiments relate to a method of producing a modified double metal cyanide complex, a method of producing a monol or polyol that includes providing the modified double metal cyanide complex, an alkylene oxide polymerization process that includes providing the modified double metal cyanide complex, a batch, semi-batch, or continuous manufacturing process that includes providing the modified double metal cyanide complex, and a polyether polyol prepared using the batch, semi-batch, or continuous manufacturing process that includes providing the modified double metal cyanide complex.

The present invention discloses a cyclopenta[c]chromene compound and a preparation method thereof. A chalcone compound as a reactant, A cationic rare earth metal compound Ln(CH.sub.3CN).sub.9].sup.3+[(AlCl.sub.4).sub.3].sup.3−.CH.sub.3CN as a catalyst, and 2-naphthalenethiol as an accelerator, react in an organic solvent to prepare the cyclopenta[c]-chromene compound. Ln represents a positive trivalent rare earth metal ion, which is selected from the group consisting of La, Nd, Sm, Gd, and Yb. The starting materials are easy obtained, the reaction process is simple, and the yield of the target product is high, up to 85%.

The present invention discloses a cyclopenta[c]chromene compound and a preparation method thereof. A chalcone compound as a reactant, A cationic rare earth metal compound Ln(CH.sub.3CN).sub.9].sup.3+[(AlCl.sub.4).sub.3].sup.3−.CH.sub.3CN as a catalyst, and 2-naphthalenethiol as an accelerator, react in an organic solvent to prepare the cyclopenta[c]-chromene compound. Ln represents a positive trivalent rare earth metal ion, which is selected from the group consisting of La, Nd, Sm, Gd, and Yb. The starting materials are easy obtained, the reaction process is simple, and the yield of the target product is high, up to 85%.