6 results about "Sodium Acetate Trihydrate" patented technology

The present application relates to a kind of MVR processing system and method of high-salt wastewater containing sodium acetate and sodium chloride, belong to high-salt wastewater treatment technical field, including the following preparation steps: S1, MVR evaporation stage: high-salt wastewater is added to MVR evaporator and is evaporated, and evaporation liquid is obtained;S2, first crystallization leaching stage: evaporation liquid is cooled and crystallized, and first mother liquor and first crystal are obtained, and the first crystal that is separated out is filtered and leached, and sodium chloride is obtained, and the first leaching liquid after filtration and leaching is transported to MVR evaporator;S3, second crystallization leaching stage: first mother liquor is diluted with water and cooled and crystallized, and second crystal and second mother liquor are obtained, and the second crystal that is separated out is filtered and leached, and sodium acetate trihydrate is obtained, and second mother liquor and the second leaching liquid after filtration and leaching are transported to MVR evaporator.The present application realizes the continuous separate separation of two salt divisions of sodium acetate and sodium chloride, reduces the discharge of waste mother liquor, and meets the concept of energy saving and carbon reduction in the industry.

The application discloses a preparation method of a composite phase change material for solving the supercooling problem of sodium acetate trihydrate, and relates to the technical field of phase change material production, and comprises the following steps: S1, 30 g of natural crystalline bischofite is weighed, dried at 120 DEG C for 12 h, and then dissolved in 90 g of anhydrous ethanol to form a magnesium chloride solution; S2, the magnesium chloride solution is filtered by using a vacuum filtration bottle, and insoluble substances are separated; the ethanol component in the obtained solution after filtration is evaporated by using a rotary evaporator, and a precipitate, magnesium chloride hexahydrate MgCl2.6H2O, is obtained; S3, the magnesium chloride hexahydrate MgCl2.6H2O is combined with sodium acetate trihydrate SAT at an optimized mass ratio of 3:17; and S4, after complete melting and uniformity, 1% sodium polyacrylate PAAS is added as a thickening agent, and the mixture is packaged in expanded graphite EG. The method can realize effective utilization of the by-product bischofite of a salt lake, and simultaneously solve the supercooling problem of SAT.

The composite coating material of the present invention comprises a three-layer structure. In the middle layer, based on 100 parts by weight of sodium acetate trihydrate, the amount of borax nucleating agent is controlled at 5.1-9.6 parts by weight, which enables the surface temperature of the composite coating material to be controlled at 40±1.5℃, meeting the usage requirements of traditional Chinese medicine ironing.

This invention relates to the field of battery thermal safety technology, and particularly to a dual-scale encapsulated hydrated salt composite phase change material, its preparation method, battery module, and its application. The invention provides a dual-scale encapsulated hydrated salt composite phase change material, comprising a composite phase change material core and a dense protective layer encapsulated on the outer surface of the composite phase change material core. The raw materials for preparing the composite phase change material core include a eutectic hydrated salt phase change matrix, a thickener, hydrophilic fumed silica, and expanded graphite. The eutectic hydrated salt phase change matrix includes sodium thiosulfate pentahydrate and sodium acetate trihydrate. The dense protective layer is a UV-curable resin layer. The dual-scale encapsulated hydrated salt composite phase change material achieves synergistic optimization of the hydrated salt composite material in terms of low undercooling, high thermal conductivity, leakage resistance, and long-term cycle stability by constructing a dual-scale encapsulation structure of "microscopic adsorption-macroscopic coating."

This invention proposes a spherical sodium acetate trihydrate composite phase change material and its microfluidic preparation method. The method includes: mixing and melting sodium acetate trihydrate with a nucleating agent, a thickener, and a thermally conductive filler to form a homogeneous composite liquid; adding the composite liquid dropwise to a silicone oil medium of a specific viscosity using a microfluidic device, utilizing interfacial tension to shape the droplets into spherical shapes and complete controlled phase change solidification; finally, washing and drying to obtain the spherical product. A specific order is used: adding the nucleating agent first, then the thermally conductive filler, and finally the thickener. This invention, through the synergy of microfluidic technology and composite formulation, successfully prepares a composite phase change material with good sphericity and uniform particle size, effectively solving the problems of severe undercooling, easy phase separation, and the inability to controllably prepare spherical particles using traditional methods. The product exhibits low undercooling, high phase change enthalpy, and excellent cycling stability.

This invention provides a sodium acetate trihydrate-based composite phase change material for battery thermal management, its preparation method, and its applications. The composite phase change material specifically comprises: potassium chloride, urea, polyethylene glycol, tetrasodium pyrophosphate decahydrate, expanded graphite, and sodium acetate trihydrate. This invention achieves phase change temperature suitable for lithium battery thermal management through the synergistic regulation of phase change temperature by urea and potassium chloride; reduces supercooling by tetrasodium pyrophosphate decahydrate; inhibits phase separation by polyethylene glycol; and improves thermal conductivity and shape stability by utilizing expanded graphite. The material achieves a thermal conductivity of 1.42 W / (m•K), significantly reduces supercooling, and maintains good stability after 50 melt-solidification cycles. This material can be used for passive thermal management of 46950 cylindrical lithium-ion batteries, effectively reducing battery temperature rise under 1C-3C discharge conditions. Therefore, the composite phase change material of this invention has the characteristics of low supercooling, resolution of severe phase separation, low phase change temperature, and good thermal conductivity.