Preparation method of sorbitan cashew nut oleate
The method of preparing sorbitan cashew oleate through mixing and vacuum esterification with a catalyst, followed by decolorization, enhances reaction activity and reduces by-products, achieving a cost-effective emulsifier with improved properties.
Patent Information
- Application Number
- CN202411372696.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-01-03
AI Technical Summary
Existing sorbitan monooleate production technologies face challenges in improving reaction activity, controlling monoester formation, reducing temperature, and minimizing by-products while maintaining cost-effectiveness.
A method involving mixing sorbitan and cashew nut shell oleic acid with a catalyst, followed by a vacuum esterification reaction, and subsequent acid reduction and decolorization to produce sorbitan cashew oleate, using solid acid catalysts like phosphoric acid and decolorizers such as activated carbon.
The method results in a sorbitan cashew oleate emulsifier with moderate viscosity, low acid value, high hydroxyl value, and reduced energy consumption, addressing high temperature issues and simplifying product components.
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Figure CN119241485A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of emulsifier synthesis, and in particular to a method for preparing sorbitan cashew oleate. Background Art
[0002] Sorbitan monooleate is a typical low-molecular nonionic surfactant with good emulsification, dispersion, penetration and solubilization effects. It is widely used in the pharmaceutical, food, chemical and metal processing and cutting industries. At the same time, it is very effective in the preparation of emulsion explosives. It is widely used in the formulation of emulsion explosives at home and abroad and has become an important raw material for water-in-oil emulsion explosives. At present, although the production technology of sorbitan monooleate is relatively mature, how to improve the reaction activity, control the formation of monoesters, reduce the temperature to reduce by-products, and reduce the cost of raw material procurement are still technical problems that need to be solved. Summary of the invention
[0003] In order to improve the reaction activity, control the formation of monoester, lower the temperature, reduce by-products, and reduce the cost of raw material procurement during the production of sorbitan monooleate, the present application provides a method for preparing sorbitan cashew oleate.
[0004] The preparation method of sorbitan cashew oleate provided in the present application adopts the following technical scheme: A method for preparing sorbitan cashew oleate comprises the following steps: S1. Mixing: adding sorbitan, vegetable oleic acid and a catalyst into a reaction container in sequence, stirring and mixing to obtain a mixture, wherein the vegetable oleic acid is cashew nut shell oleic acid; S2, reaction: heating the mixture and performing a constant temperature esterification reaction under vacuum to obtain a crude emulsifier product; S3, post-treatment: the crude emulsifier product is subjected to acid reduction, decolorization and filter pressing treatment to obtain the finished emulsifier product, i.e., sorbitan cashew oleate.
[0005] Preferably, in step S1, the catalyst comprises a solid acid catalyst, and the solid acid catalyst comprises one or more of phosphoric acid, phosphorous acid or p-toluenesulfonic acid, and the mass percentage of the catalyst is 0.3% to 0.6%.
[0006] Preferably, in step S2, the mass of cashew nut shell oleic acid in the mixture is 120% to 160% of the mass of sorbitan, the temperature of the constant temperature esterification reaction is 120 to 170° C., and the reaction time is 2 to 4 hours.
[0007] Preferably, in step S3, the decolorization treatment is performed by a decolorizer, and the decolorizer includes one or more of activated carbon, activated clay, and alkaline alumina.
[0008] Compared with the prior art, the present invention has at least the following beneficial effects: 1. In the present application, sorbitan, cashew nut shell oleic acid and a catalyst are added into a reactor and mixed thoroughly, and the mixture is isothermally reacted at a temperature of 120 to 170° C. for 2 to 4 hours under a vacuum state, the reaction is terminated, and the mixture is naturally cooled to room temperature to obtain sorbitan cashew oleate; the problems of high temperature and complex product components in the current sorbitan oleate synthesis process are solved. At the same time, the preparation method has low material cost, high activity, low energy consumption and relatively simple product components. The produced sorbitan cashew oleate emulsifier has moderate viscosity, low acid value and high hydroxyl value, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is the structural formula of the synthesis process of sorbitan oleate in the embodiment of the present application.
[0010] Figure 2 It is a process flow chart of the synthesis of sorbitan oleate in the examples of the present application.
[0011] Figure 3 It is the infrared spectrum of sorbitan cashew oleate in the examples of the present application. DETAILED DESCRIPTION
[0012] The present application is further described in detail below in conjunction with embodiments.
[0013] Example 1 like Figure 2 As shown, a method for preparing sorbitan cashew oleate comprises the following steps: S1, mixing: 8.2 kg of sorbitan, 9.85 kg of vegetable oleic acid, and 0.3 wt % of a catalyst are added to a reactor and mixed thoroughly to obtain a mixture, wherein the vegetable oleic acid is cashew nut shell oleic acid, and the catalyst is a solid acid catalyst, which includes one or more of phosphoric acid, phosphorous acid, or p-toluenesulfonic acid. Phosphoric acid is selected as the catalyst in the embodiment of the present application; S2. Reaction: The mixture is heated and reacted at a constant temperature of 130° C. for 2 hours under vacuum. The reaction is terminated and naturally cooled to room temperature to obtain a crude product of sorbitan cashew oleate.
[0014] S3, post-treatment: the crude emulsifier product is subjected to acid reduction, decolorization, filter pressing, and HLB adjustment to obtain an emulsifier product for emulsion explosive; the decolorization treatment is carried out by a decolorizer, and the decolorizer is one or more of activated carbon, activated clay, and alkaline alumina. The decolorizer in the embodiment of the present application is activated carbon.
[0015] The prepared emulsifier product had an acid value of 3.50 mgKOH / g, a saponification value of 155.22 mgKOH / g, a hydroxyl value of 252.43 mgKOH / g, and a viscosity (40°C) of 800 mPa·s.
[0016] Example 2 like Figure 2 As shown, a method for preparing sorbitan cashew oleate, the steps of the preparation method are as follows: S1, mixing: 8.2 kg of sorbitan, 13.1 kg of vegetable oleic acid, and 0.5 wt % of a catalyst are added to a reactor and mixed thoroughly to obtain a mixture, wherein the vegetable oleic acid is cashew nut shell oleic acid, and the catalyst is a solid acid catalyst, which includes one or more of phosphoric acid, phosphorous acid, or p-toluenesulfonic acid. Phosphoric acid is selected as the catalyst in the embodiment of the present application; S2. Reaction: The mixture is heated and reacted at a constant temperature of 150° C. for 3 hours under vacuum. The reaction is terminated and naturally cooled to room temperature to obtain a crude product of sorbitan cashew oleate.
[0017] S3, post-treatment: the crude emulsifier product is subjected to acid reduction, decolorization, filter pressing, and HLB adjustment to obtain an emulsifier product for emulsion explosive; the decolorization treatment is carried out by a decolorizer, and the decolorizer is one or more of activated carbon, activated clay, and alkaline alumina. The decolorizer in the embodiment of the present application is activated carbon.
[0018] The prepared emulsifier product had an acid value of 3.77 mgKOH / g, a saponification value of 167.52 mgKOH / g, a hydroxyl value of 256.43 mgKOH / g, and a viscosity (40°C) of 768 mPa·s.
[0019] The application is not limited to the above-mentioned specific embodiments, and it should be understood that those skilled in the art can make a lot of modifications on the basis of technical scheme of the present invention without creative work, including that biomass oil in the application is composited with oil phase material in existing porous granular ammonium nitrate oil explosive preparation technology. Therefore, all those skilled in the art should be within the protection scope determined by claims according to the concept of the present invention by logical analysis, reasoning or limited experimental obtainable technical inventions or schemes on the basis of prior art.
Claims
1. A method for preparing sorbitan cashew oleate, characterized in that: The steps include: S1. Mixing: adding sorbitan, vegetable oleic acid and a catalyst into a reaction container in sequence, stirring and mixing to obtain a mixture, wherein the vegetable oleic acid is cashew nut shell oleic acid; S2, reaction: heating the mixture and performing a constant temperature esterification reaction under vacuum to obtain a crude emulsifier product; S3, post-treatment: the crude emulsifier product is subjected to acid reduction, decolorization and filter pressing treatment to obtain the finished emulsifier product, i.e., sorbitan cashew oleate.
2. The method for preparing sorbitan cashew oleate according to claim 1, wherein: In the step S1, the catalyst comprises a solid acid catalyst, and the solid acid catalyst comprises one or more of phosphoric acid, phosphorous acid or p-toluenesulfonic acid, and the mass percentage of the catalyst is 0.3% to 0.6%.
3. The method for preparing sorbitan cashew oleate according to claim 1, wherein: In the step S2, the mass of cashew nut shell oleic acid in the mixture is 120% to 160% of the mass of sorbitan, the temperature of the constant temperature esterification reaction is 120 to 170° C., and the reaction time is 2 to 4 hours.
4. The method for preparing sorbitan cashew oleate according to claim 1, wherein: In the step S3, the decolorization treatment is performed by a decolorizer, and the decolorizer includes one or more of activated carbon, activated clay, and alkaline alumina.