32results about How to "Eliminate high vacuum refining steps" patented technology

The invention relates to a preparation method of diisooctyl adipate. The preparation method comprises the following steps of: putting adipic acid, isooctanol and concentrated sulfuric acid into a reaction kettle; under stirring condition, heating for a boiling reaction in micro-vacuum (500-600 mmHg), keeping a boiling reflux state and separating out moisture from the mixture; adding water to a mixture subjected to esterification reaction, standing for layering after even stirring, and removing the moisture from the mixture; dealcoholizing the mixture subjected to water washing, thereby obtaining the crude product of diisooctyl adipate; adding a refining agent to the dealcoholized crude product and stirring and refining; and filtering the refined mixed liquid, thereby obtaining the diisooctyl adipate. According to the method provided by the invention, the refining agent (a mixture of sodium carbonate, magnesium carbonate, active carbon and magnesium sulfate) is used in the refining step, so that the color of the obtained diisooctyl adipate is lighter and the diisooctyl adipate can be sold out as a product without high-vacuum refining treatment; and the quality of the prepared diisooctyl adipate completely meets the requirements of technical indexes.

The invention relates to a refining agent for synthesizing dioctyl sebacate and a preparation method for the dioctyl sebacate. The method for synthesizing the dioctyl sebacate comprises esterification, washing, dealcholization, refining and filtration, wherein in the refining step, the refining agent is prepared by mixing potassium carbonate, magnesium hydroxide, active carbon and magnesium sulfate in a certain proportion. By the invention, the industrial production is facilitated and the production efficiency is improved; and a high vacuum refining step is saved during production, and the input of high vacuum pump equipment is absent, so the equipment investment is saved, the production cost is reduced and the market competitiveness of the product is improved; the refining agent is prepared by mixing the potassium carbonate, the magnesium hydroxide, the active carbon and the magnesium sulfate in a proportion, the components have the characteristics of low prices and capacity of being easily purchased; meanwhile, the product quality and long-term storage stability are ensured; and the preparation method is easy and convenient to implement, the investment of production equipment is saved and the production efficiency is improved.

The invention relates to a method for preparing butyl stearate, which comprises the following steps of: adding stearic acid, butanol and concentrated sulfuric acid into a reaction kettle in turn, heating for boiling reaction with stirring, keeping the boiling reflux state, continuously separating water out of an oil-water separator until water is not generated, stopping heating, terminating esterification; performing water washing; distilling to remove a solvent; and refining to obtain liquid, namely the butyl stearate finished product. The preparation method saves a high vacuum refining step during production, avoids the investment of high vacuum pump equipment, saves equipment investment, reduces production cost, shortens the whole production period, improves production efficiency, and is suitable for implementing the whole scheme in industrial production.

The invention relates to a method for preparing dinonyl adipate by utilizing a refining agent. The method comprises the following steps: esterifying, namely, putting adipic acid, nonyl alcohol and concentrated sulfuric acid in a reaction kettle, stirring, carrying micro vacuumizing, heating to boil, reacting, and separating out water in the reaction under the condition that the boiling reflux state is maintained, wherein the weight ratio of adipic acid to nonyl alcohol to concentrated sulfuric acid is 1:2.2:(0.002-0.005); and then washing, dealcoholizing, refining and filtering. According to the refining method of dinonyl adipate, in the refining step, due to use of the refining agent, the color of the obtained product is light, the obtained product can be sold without high-vacuum refining treatment, and the quality of the prepared product completely meets the technical index requirements.

The invention relates to a refining agent for synthesizing isopropyl myristate and a preparation method for the isopropyl myristate. The method for synthesizing the isopropyl myristate comprises esterification, washing, dealcholization, refining and filtration, wherein in the refining step, the refining agent is prepared by mixing calcium hydroxide, magnesium hydroxide, active carbon and magnesium sulfate in a certain proportion. By the invention, the industrial production is facilitated and the production efficiency is improved; and a high vacuum refining step is saved during production, and the input of high vacuum pump equipment is absent, so the equipment investment is saved, the production cost is reduced and the market competitiveness of the product is improved; the refining agent is prepared by mixing the calcium hydroxide, the magnesium hydroxide, the active carbon and the magnesium sulfate in a proportion, the components have the characteristics of low prices and capacity of being easily purchased; meanwhile, the product quality and long-term storage stability are ensured; and the preparation method is easy and convenient to implement, the investment of production equipment is saved and the production efficiency is improved.

The present invention relates to a kind of fine preparation and preparation method thereof for synthesizing di-2-ethylhexyl adipate, the method for synthesizing di-2-ethylhexyl adipate comprises esterification, water washing, dealcoholization, Refining and filtering, wherein the refining agent used in the refining step is formed by mixing calcium hydroxide, magnesium hydroxide, activated carbon and magnesium sulfate in a certain proportion. The present invention facilitates the realization of industrialized production and improves production efficiency. Since the high vacuum refining step is omitted during production, and there is no investment in high vacuum pump equipment, equipment investment is saved, production costs are reduced, and the market competitiveness of products is improved. The refined preparation is Calcium hydroxide, magnesium hydroxide, activated carbon, and magnesium sulfate are mixed in proportion. Each component has the characteristics of low price and easy procurement. At the same time, product quality and long-term storage stability are guaranteed. The preparation method is simple and easy to operate. The investment in production equipment is saved, and the production efficiency is improved.

The invention relates to a refining method of dinonyl adipate. The method comprises the following steps: esterifying: putting adipic acid, nonyl alcohol and concentrated sulfuric acid in a reaction kettle, stirring, carrying out micro vacuumizing, heating to boil, reacting, and separating out water in the reaction under the condition that boiling reflux state is maintained, wherein the weight ratio of adipic acid to nonyl alcohol to concentrated sulfuric acid is 1:2.2:(0.002-0.005); and then washing, dealcoholizing, refining and filtering. According to the refining method of dinonyl adipate, in the refining step, the color of the product obtained by using the refining agent is light, the product can be sold without high-vacuumizing treatment, and the quality of the prepared product completely meets the technical index requirements. The high-vacuumizing refining step is omitted during production, and the investment of a high-vacuumizing pump is avoided, thus equipment investment is saved, production cost is reduced, and the market competitiveness of the product is improved.

The invention relates to a preparation method of diisooctyl adipate. The preparation method comprises the following steps of: putting adipic acid, isooctanol and concentrated sulfuric acid into a reaction kettle, heating until the materials are boiled under the conditions of stirring and micro-vacuum (500-600mmHG), keeping a boiling reflux state, and separating water from the heated mixture till no water exists in the heated mixture; adding water to the mixture subjected to an esterification reaction, uniformly stirring, standing for layering, and removing a water layer to obtain a water-washed mixture; dealcoholizing the water-washed mixture to obtain a rough diisooctyl adipate product; adding a refining agent to the rough diisooctyl adipate product, stirring and refining; and filtering the refined mixture liquid to obtain the diisooctyl adipate. According to the preparation method, in the production process, the refining agent (a calcium oxide, magnesium oxide, activated carbon and silica mixture) is used, so that the product quality and the long-term storage stability are ensured; meanwhile, the preparation method has the characteristics of simpleness in implementation and convenience for operation and is convenient for industrial production; and the investment of production equipment is saved and the production efficiency is improved.

The invention relates to a method for refining trioctyl trimellate and a refining agent used in the refining process. The refining agent comprises the following ingredients: 0.5 weight portions of sodium carbonate, 1 weight portion of magnesium carbonate, 2 weight portions of active carbon, and 1.5 weight portions of magnesium sulfate. The finished product of trioctyl trimellate is prepared by the following steps: adding the refining agent in the crude product of trioctyl trimellate with the weight ratio of the refining agent to trioctyl trimellate of 0.05-0.1:1, stirring for refining for 1 h, and filtering the refined mixed solution. The method omits the step of high vacuum refining, avoids the investment of high vavuum pump equipment, so that, the equipment investment is saved, the production cost is reduced, and the competition power of the product is increased.

The invention relates to a method for preparing N,N-dipropyl-m-toluamide. The method comprises the following steps: (1) amidation reaction step, dipropylamine, benzene and water are put into a reaction kettle, stirred, and simultaneously separated into Add m-toluoyl chloride and compound acid in batches to absorb the refined preparations sodium carbonate and potassium carbonate, keep the reaction at room temperature, and complete the addition of materials, stir the reaction until no bubbles escape, and the reaction is completed; (2) washing step, the mixture after amidation reaction Add water to the medium, stir evenly, stand for stratification, and remove the water layer therein; (3) distillation and desolvation step. The compound acid absorption refined preparation used in the preparation method of this N,N-dipropyl-m-toluamide is sodium carbonate and potassium carbonate, which have the characteristics of low price and easy procurement.