4results about How to "Uniform crystal particles" patented technology

The invention belongs to the technical field of dibromohydantoin production, and particularly provides a dibromohydantoin synthesis method which comprises the following steps: S1, preparing a raw material aqueous solution, namely respectively mixing dimethyl hydantoin, sodium bromide and liquid caustic soda NaOH with deionized water to form a dimethyl hydantoin aqueous solution, a sodium bromide aqueous solution and a liquid caustic soda NaOH aqueous solution; s2, premixing the raw material aqueous solution, namely mixing the aqueous solution of dimethyl hydantoin, sodium bromide and caustic soda liquid NaOH prepared in S1 to obtain a premix; s3, electrochemical in-situ bromination reaction: introducing the premix into a micro-channel reactor provided with an electrolysis electrode, and applying current to the premix to obtain a dibromohydantoin initial solution; and S4, crystallizing, separating and drying the product, carrying out cooling crystallization through a three-stage stepped cooling method to obtain a dibromohydantoin crystal, carrying out centrifugal separation to obtain a dibromohydantoin wet product, and then drying to obtain a dibromohydantoin finished product. The method can improve the generation stability and the product quality of the dibromohydantoin.

This invention relates to the field of crystallizer technology and discloses a continuous scraper crystallizer with a single water-cooling path. It includes a crystallizer shell, inside which multiple cooling plates are fixed. Each cooling plate has a cooling water flow channel, and adjacent cooling plates are connected in series via connecting pipes. An air-cooled box is installed at the top of the crystallizer shell, and the top portion of the connecting pipe extends into the air-cooled box. A stirring shaft is rotatably mounted inside the crystallizer shell, driven by a rotary motor. A stirring and scraping crystallization mechanism is installed on the outside of the stirring shaft at a position corresponding to the cooling plate. This invention, due to its single cooling water path, provides a uniform temperature gradient, excellent crystallization effect, and high product purity and yield. The inner wall of the crystallizer shell is rigorously polished to ensure a roughness ≤0.1nm, virtually eliminating wall adhesion and facilitating smoother production.

The utility model provides a kind of acid precipitation reaction device for salicylic acid production, it is related to chemical production equipment technical field, including reaction tank, the top of the reaction tank is fixedly connected with top cover, the top right side of the top cover is equipped with the feed inlet that passes up and down, the bottom right side of the reaction tank is fixedly connected with collecting tube.The utility model after acid precipitation reaction is completed, precipitate falls into the storage tank in left side, first motor is started at this time, its drive rotating disc rotates, drives the storage tank position of left and right sides to be transposed, the storage tank with precipitate is rotated to right side and is aligned with collecting tube, precipitate falls into collecting box by gravity, simultaneously, empty storage tank is rotated to left side and is aligned with the bottom of conical precipitation area, and new precipitate is received, so circulation realizes the sustained automatic separation of precipitate and supernatant, greatly reduces labor intensity, shortens production cycle, and avoids impurity introduction, significantly improves separation efficiency and product quality.

The invention provides a composite crystal modifier for preparing high-whiteness alpha high-strength gypsum from synthetic gypsum and application, and belongs to the technical field of chemical materials, the composite crystal modifier is prepared by mixing the following components by weight: 15-20 parts of a dissolution promoting component, 50-80 parts of a crystal transformation component, 5-10 parts of a crystal nucleus component, and 3-5 parts of a whitening component, the alpha high-strength gypsum prepared from the crystal modifier has the advantages of high whiteness, high strength, stable properties and the like, has the performance index exceeding the alpha50 level, and can be widely applied to the industries of high-end building materials, medical treatment, model manufacturing and the like.