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

The invention relates to a preparation method of diisobutyl adipate. The method includes following steps of an esterification reaction step, a washing step, a dealcoholizing step, a refining step and a filtering step, wherein the dealcoholizing step is that refining agents are added to dealcoholized coarse products to be stirred and refined for one hour, and the filtering step is that refined mixed liquids are filtered to obtain a diisobutyl adipate product. According to the preparation method of the diisobutyl adipate, the refining agents are used in the refining step so that the color of the final obtained product is shallow, the product can be sold without high vacuum refining processing, and the quality of the prepared product completely fits with technical indicator requirements. According to the preparation method, a high vacuum refining step is omitted during production, investment for high vacuum pump devices is avoided, accordingly, device investment is saved, production costs are reduced, and market competition of the product is improved.

The invention relates to a method for refining tri-n-hexyl trimellitate and a used refining agent thereof. The refining agent comprises the following components in the following mass ratio: calcium oxide: magnesia: active carbon: silicon dioxide=1:1:2:1. The method for preparing the tri-n-hexyl trimellitate comprises the following refining steps of: adopting the refining agent, adding the refining agent to a crude product of the tri-n-hexyl trimellitate with the mass ratio of the refining agent to trimellitic acid being 0.05-0.1:1, stirring and refining for one hour, and filtering refined mixed liquid to obtain a finished product of the tri-n-hexyl trimellitate. A high-vacuum refining step is omitted in the preparation method during production, thereby the input of high-vacuum pump equipment is avoided, so that the investment of the equipment is saved, the production cost is lowered, 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; 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 method for refining tri-n-hexyl trimellitate and a refining agent used in the method. The refining agent comprises the following components: sodium carbonate, magnesium carbonate, activated carbon and magnesium sulfate, wherein the mass ratio of sodium carbonate to magnesium carbonate to activated carbon to magnesium sulfate is 0.5:1:2:1.5. The method for preparing the tri-n-hexyl trimellitate comprises the following refining steps: adding the refining agent in a tri-n-hexyl trimellitate crude product, stirring and refining for 1 hour, wherein the mass ratio of refining agent to trimellitic acid is (0.05-0.1):1; and filtering a mixed liquid after refining so as to obtain the tri-n-hexyl trimellitate finished product. In the preparation method, a high vacuum refining step is omitted when in production, and the investment of high vacuum pump equipment is avoided, thus saving equipment investment, reducing production cost and improving the market competitiveness of a product.

The invention relates to a method for refining adipate2-benzyl ethylhexyl and a used refining agent thereof. The refining agent comprises the following components in the following mass ratio: calcium oxide: magnesia: active carbon: silicon dioxide=1:1:2:1. The method for preparing the adipate2-benzyl ethylhexyl comprises the following refining steps of: adopting the refining agent, adding the refining agent to a crude product of the adipate2-benzyl ethylhexyl with the mass ratio of the refining agent to adipate being 0.005-0.01:1, stirring and refining for one hour, and filtering refined mixed liquid to obtain a finished product of the adipate2-benzyl ethylhexyl. A high-vacuum refining step is omitted in the preparation method during production, thereby the input of high-vacuum pump equipment is avoided, so that the investment of the equipment is saved, the production cost is lowered, and the market competitiveness of the product is improved.

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 preparation method of adipic acid-di-n-propyl ester, comprising the following steps: (1) esterification reaction: putting adipic acid, normal propyl alcohol and concentrated sulphuric acid into a kettle, stirring, heating to boiling reaction, and keeping the boiling backflow state to separate water therein; (2) washing: adding water in mixture which finishes the esterification reaction, stirring evenly, standing, layering and removing an aqueous layer therein; (3) refining: adding refining agent into the washed mixture, and stirring and reining for one hour; and (4) filtering: filtering refined mixed liquor to obtain the adipic acid-di-n-propyl ester product. The preparation method of the invention saves the step of high-vacuum refining during production and avoids operation of high-vacuum pump equipment, thus saving equipment investment, lowering production cost and improving the market competitiveness of products.

The invention relates to a method for preparing dipropyl adipate, which comprises the following steps of: (1) esterification: putting adipic acid, normal propyl alcohol and concentrated sulfuric acid into a kettle, stirring, heating for boiling reaction, and keeping the boiling reflux condition to separate water from the mixture; (2) washing: adding water into the esterified mixture, stirring uniformly, standing for demixing, and removing a water layer; (3) refining: adding a refining agent which is prepared by mixing calcium hydroxide, magnesium hydroxide, activated carbon and magnesium sulfate according to a weight ratio of 1:1:2:1 into the washed mixture, stirring and refining for 1 hour; and (4) filtration: filtering the refined mixed liquor to prepare a dipropyl adipate product. In the preparation method, a high-vacuum refining step is saved and the input of high-vacuum pump equipment is avoided during production, so the equipment investment is saved, the production cost is reduced, and the market competiveness of the product is improved.

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 invention relates to a preparation method of dinonyl adipate. The method comprises the following steps of: (1) performing an esterification reaction step, i.e., adding adipic acid, nonanol and concentrated sulfuric acid into a reaction kettle, stirring, treating under a micro-vacuum condition and heating to be boiled for reaction, and keeping in a boiling reflow state to separate moisture in the mixture, and the weight ratio of the adipic acid to the nonanol to the concentrated sulfuric acid is 1:2.2:0.002-0.005; and then washing, dealcoholizing, refining and filtering. The refining method of the dinonyl adipate is in the refining step; by using a refining agent, the color of an obtained product becomes light; the dinonyl adipate can be used as a product to be sold without high-vacuum refining treatment; the quality of the prepared product fully meets the technical index requirement.

The present invention relates to a kind of preparation method of octanoic acid butyl ester, and this method comprises the following steps: (1) esterification reaction step, put octanoic acid, butanol, concentrated sulfuric acid into reaction kettle, stir, heat to boiling reaction, keep boiling reflux state and separate moisture therein; (2) washing step, adding water to the mixture after the esterification reaction, stirring evenly, standing for stratification, and removing the water layer therein; (3) dealcoholization step; (4) refining step, the crude product after dealcoholization Add the refined preparation, stir and refine for one hour; (5) Filtration step. The preparation method of the butyl octanoate has the advantages of convenient operation, simple operation, convenient realization of industrialized production, and improvement of production efficiency.

The invention relates to a preparation method of dioctyl adipate. The preparation method includes the steps that 1, adipic acid, isooctyl alcohol and concentrated sulphuric acid are thrown into a reaction kettle, stirred and heated to a boiling reaction under the condition of micro-vacuum 550-590 mmHg, and a boiling reflux state is kept to separate water in the mixture; 2, water is added into a mixture after an esterification reaction, even stirring is performed, then standing layering is performed, and a water layer in the mixture is removed; 3, dealcoholization is performed on a rinsed mixture to obtain crude product dioctyl adipate; 4, a refining agent is added into the crude product after dealcoholization, stirring refining is performed for 1 hour, and mixed liquor is obtained and filtered; 5, the refined mixed liquor is filtered to obtain dioctyl adipate. In the refining step, the color intensity of the product obtained through using the refining agent becomes lower, and dioctyl adipate can serve as a product to be sold without high vacuum refining treatment. The quality of the prepared product completely meets technical index requirements, equipment investment is saved, the production cost is lowered, and the market competitiveness of the product 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 an efficient trimellitate tri C8-C10 preparation method, which comprises: (1) an esterifying reaction, wherein trimellitic acid, C8-C10 alcohol and concentrated sulfuric acid are poured into a reaction kettle, stirring is performed, heating is performed until a boiling state is achieved, a reaction is performed, the boiling reflux state is maintained, and the water is separated; (2) water washing; (3) alcohol removing; (4) refining; and (5) filtering, wherein the refined mixing liquid is filtered to obtain the trimellitate tri C8-C10 product. According to the present invention, the trimellitate tri C8-C10 preparation method has characteristics of convenient operation, simpleness, easy performing and production efficiency improving, and is suitable for industrial production.

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 butyl caprylate. The method comprises the following steps: (1) carrying out esterification reaction step, namely putting octanoic acid, butanol and concentrated sulfuric acid into a reaction still, stirring, heating to realize boiling reaction, and keeping a boiling reflux state to separate water; (2) carrying out washing step, adding water into themixture after esterification reaction, stirring uniformly, standing for layering, and removing a water layer; (3) carrying out dealcoholization step; (4) carrying out refining step, namely adding a refining agent into a crude product after dealcoholization, and stirring and refining for one hour; and (5) carrying out filtering step. The refining agent used by the method for preparing butyl caprylate is a mixture of calcium hydroxide, magnesium hydroxide, activated carbon and magnesium sulfate, and has the characteristics of low cost, and easy purchasing.

The invention relates to a method for refining diisobutyl sebacate, and the method comprises the following steps: (1) an esterification step, to be more specific, pouring sebacic acid, isobutyl alcohol and concentrated sulfuric acid into a reaction kettle, stirring, and heating to boil for reaction, and keeping a boiling reflux state for separation of water in the reaction kettle; (2) a water washing process; (3) a refining step, to be more specific, adding a refining agent into a mixture after the water washing step, and stirring for refining for an hour; and (4) a filtering step, to be more specific, filtering a mixed solution filter after the refining step to obtain a diisobutyl sebacate product. The refining agent used in the method for preparation of the diisobutyl sebacate is a mixture of calcium hydroxide, magnesium hydroxide, activated carbon and magnesium sulfate, and has the advantages of low cost and easy purchase.

The invention relates to a preparation method of 2-ethylhexyl caprylate. The method comprises the following steps: (1) carrying out an esterification reaction step, namely inputting sebacic acid, 2-ethylhexanol and concentrated sulfuric acid into a reaction kettle, stirring the mixture, heating the mixture for a boiling reaction, and keeping the boiling reflux state and separating water therein; (2) carrying out a washing step, namely adding water into the mixture after esterification reaction, uniformly stirring the mixture, standing and layering, and removing a water layer therein; (3) carrying out a dealcoholizing step; and (4) carrying out a filtering step. The refining agent used in the preparation method of 2-ethylhexyl caprylate is a mixture of calcium hydroxide, magnesium hydroxide, activated carbon and magnesium sulfate, and has the characteristics of low price and easiness in purchasing.

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.

The invention relates to a method for refining trioctyl trimellitate and a refining agent used thereby. The refining agent comprises components including calcium oxide, magnesium oxide, active carbon and silica in a mass ratio of 1:1:2:1. The refining agent is adopted in a refining step in the preparation of trioctyl trimellitate. The refining agent is added into coarse trioctyl trimellitate according to a refining agent to trioctyl trimellitate mass ratio of (0.05-0.1):1; the mixture is stirred and refined for 1 hour; the refined mixed solution is filtered; and thus, finished trioctyl trimellitate is obtained. In the preparation method, the need of a high-vacuum refining step and investment in high-vacuum pump equipment during production is obviated, so the equipment investment is saved, production cost is lowered and the market competitive power of the product is increased.

The invention relates to a refining method of dihexyl sebacate. The method comprises the following steps: (1) esterification reaction: adding sebacic acid, hexyl alcohol and concentrated sulfuric acid into a reaction kettle, stirring, heating to realize boiling reaction, and keeping in a boiling reflux state to separate water from a mixture; (2) washing: adding water into the mixture prepared by the esterification reaction, stirring uniformly, standing and layering to remove a water layer from the mixture; (3) dealcoholization: dealcoholizing the washed mixture to obtain a crude product of dihexyl sebacate; (4) refining and filtering, thus obtaining a dihexyl sebacate product. A refining agent used in the refining method of the dihexyl sebacate is a mixture of calcium hydroxide, magnesium hydroxide, activated carbon and magnesium sulfate, and has the characteristics of low cost and easiness for purchasing.

The invention relates to a preparation method of diisobutyl sebacate. The method comprises the following steps: (1) an esterification reaction step: sebacic acid, isobutanol, and concentrated sulfuric acid are added into a reaction vessel, stirring is carried out in micro-vacuum, heating is carried out till a boiling reaction, boiling and backflow state are kept in order to separate moisture in the materials; (2) a washing step; (3) a refining step, (4) a filtering step: refined mixed liquor is filtered, and the diisobutyl sebacate product is obtained. A refining agent used in the preparation method of diisobutyl sebacate is a mixture of calcium oxide, magnesium oxide, active carbon, and silicon dioxide, and the method has the characteristics of low price and easy purchase.