2results about How to "Will not precipitate" patented technology

This invention discloses an industrial-scale chemical preparation method for 1,2-di fatty acid glycerides, comprising the following steps: (A) acetone glycerol is protected with a silyl ether protecting agent and purified by crystallization to obtain intermediate 1; (B) intermediate 1 undergoes a depropionyl protecting group reaction and crystallization to obtain intermediate 2; (C) intermediate 2 undergoes an esterification reaction and crystallization and adsorption to obtain intermediate 3; (D) intermediate 3 undergoes a desilyl ether protection reaction and recrystallization to obtain 1,2-di fatty acid glycerides. This invention, through crystallization purification under different conditions, avoids the disadvantages of traditional chemical methods for preparing 1,2-di fatty acid glycerides, such as the need for multiple column chromatography purification steps, low yield, and difficulty in industrialization. This method features mild operating conditions, high purity, and is easily scalable for large-scale industrialization.

The application provides a method and system for natural evaporation crystallization of rare earth chlorides, and relates to the technical field of rare earth chlorides, which comprises the following steps: adjusting the pH value of a rare earth chloride solution to 5.0-7.5, and filtering and removing impurities after clarification; performing natural evaporation concentration on the rare earth chloride solution after impurity removal at the pH value to obtain a saturated rare earth chloride solution; and performing natural crystallization on the saturated rare earth chloride solution to precipitate rare earth chloride crystals. By using the method provided by the application, high-quality rare earth chloride crystals can be prepared in a relatively safe and environmentally friendly manner under the premise of greatly reducing evaporation energy consumption.