2results about How to "Change solubility" patented technology

The application discloses a process method for producing gamma-cyclodextrin by taking ethanol and phenyl-substituted borate as a production aid, and belongs to the technical field of cyclodextrin production. The application uses gamma-cyclodextrin glucosyltransferase, takes starch as a substrate, and supplements an ethanol solution of phenyl-substituted borate as a production aid, so that the yield of gamma-cyclodextrin and the proportion of the product are significantly improved. The method is safe and efficient, and can be applied to the production of food and medicine. By using the method, the total conversion rate of gamma-cyclodextrin can reach about 54.14%, and the proportion of gamma-cyclodextrin can be up to 83.07%.

The application discloses a method for producing high-purity iron red by using iron waste slag in rare earth smelting, and relates to the field of rare earth smelting. According to the principle that iron hydroxide can be crystallized by heating in sodium hydroxide solution, and is converted into a crystal type of hydrated ferric oxide which is hardly soluble in acid by high-temperature pyrolysis, and the difference in solubility of the two in an acidic condition is used for selective leaching and separation, the iron waste slag produced in the rare earth wet smelting can be converted into a crystal type of hydrated ferric oxide by two-stage heating to different temperatures in sodium hydroxide solution, so that the solubility of iron and non-iron elements in an acidic condition is changed, and the dissolution and separation are facilitated. The process has low actual alkali consumption, and the residual alkali can be recycled, the obtained high-purity iron red meets the national standard in terms of color and impurity content, and the operation process is simple and meets the national green development concept.