3results about How to "Regulate acidity" patented technology

The application relates to the technical field of catalysts, and discloses a limited type iodine-based homogeneous immobilized catalyst as well as a preparation method and application thereof. The catalyst comprises a carrier and iodine ions, magnesium ions and quaternary ammonium ions loaded on the carrier, wherein the molar ratio of the magnesium ions, the quaternary ammonium ions, the iodine ions and the carrier is 0.01-1:4-15:1-30:1. The limited type iodine-based homogeneous immobilized catalyst disclosed by the application enhances the electrostatic interaction between iodine ions and quaternary ammonium ions through the molecular sieve limiting effect to construct a limited type structure. The catalyst has significantly enhanced CO2 adsorption and activation capacity, can activate an epoxide compound, and accelerates the ring opening of the epoxide compound. In a cycloaddition reaction catalyzed by the catalyst under the conditions of no solvent and no auxiliary agent, the conversion rate of propylene oxide can reach more than 73%, and the propylene carbonate selectivity can reach more than 85%.

The invention belongs to the field of identification of pichia aldriavzevii, and particularly relates to an identification method and application of pichia aldriavzevii with high tolerance, reduced malic acid and ethanol production, and the preservation number of the pichia aldriavzevii strain is CGMCC No. 22929. The identification method comprises the following steps: carrying out molecular identification through ITS sequence amplification sequencing; the temperature, ethanol, acid and osmotic pressure tolerance is evaluated by measuring the growth condition of the strain in a YPD culture medium containing ethanol, pH-malic acid combination and sodium chloride at different temperatures; by measuring the malic acid degradation rate and the ethanol yield of the strain in a malic acid-containing culture medium, the acid reduction and ethanol production capacities of the strain are evaluated. The strain can tolerate the high temperature of 50 DEG C, 15.2% vol ethanol, pH 3.5 and 46.8 g / L sodium chloride, and can effectively degrade malic acid and improve the yield of ethanol. The method is suitable for solving the problem of food fermentation caused by too high malic acid content and has good application prospects.

This invention relates to the field of soil remediation, and more particularly to a highly efficient remediation agent for acidic soils and its preparation method. The remediation agent consists of hydroxyapatite-modified biochar, MOF biochar composite, and lime. Compared with existing technologies, this invention not only regulates soil acidity but also provides abundant nutrients and improves soil structure. Lime can rapidly neutralize hydrogen ions in acidic soils, quickly increasing soil pH, enabling the remediation agent to improve soil acidity in a short time while achieving both short-term and long-term remediation effects. The raw materials for biochar preparation include agricultural waste such as cow dung, which are widely available and inexpensive, realizing the resource utilization of waste. Lime is also a common soil conditioner, relatively inexpensive and readily available, helping to reduce the overall production cost of the remediation agent and improve its economic feasibility and application scope.