Production technology of pentaerythrityl tetrastearate

Abstract

The invention discloses a production technology of pentaerythrityl tetrastearate. The technology comprises the following steps: 1, adding stearic acid, heating stearic acid, and adding pentaerythritol and a catalyst after the stearic acid is completely molten; 2, heating above materials to 115-125DEG C, controlling the negative pressure to be 0.01-0.03mpa, heating the materials to 137-143DEG C, increasing the negative pressure to 0.05-0.06mpa, and carrying out a reaction; 3, increasing the vacuum degree to 0.06-0.09mpa, heating the obtained reaction material to 155-165DEG C, and carrying out a reaction at a constant temperature under a constant pressure; 4, cooling the obtained reaction product after the esterification condensation reaction ends, adding diatomite or active carbon, stirring, carrying out negative pressure temperature control, cooling the above obtained material, adding the cooled material to a plate-and-frame filter press, removing the obtained filter cake, taking the obtained filtrate, spraying powder, spraying beads, slicing the obtained product, packaging the sliced product, and warehousing the packaged product. The technology has the advantages of high stability and reliability, high output, and realization of industrial production, and the prepared pentaerythrityl tetrastearate product has the advantages of good whiteness, low acid value and high purity.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis, in particular to a production process of pentaerythritol stearate tetraester. Background technique [0002] Pentaerythritol tetraester stearate (PETS 4 ) is a white hard high melting point wax, soluble in ethanol, benzene and chloroform, insoluble in water. PETS 4 It is widely used as an auxiliary heat stabilizer, plasticizer, lubricating brightener in the plastic industry, and can also be used as a transparent lubricant for calendered film and blown film. [0003] PETS 4 The traditional esterification method is formed by the esterification reaction of pentaerythritol and stearic acid at high temperature under the action of acidic or basic catalysts such as p-toluenesulfonic acid and sodium hydroxide. Its shortcoming is that after the reaction is completed, the catalyst and excess isostearic acid in the product must be removed by alkali washing or pickling. Since pentaerythritol iso...

AI Technical Summary

Problems solved by technology

Its shortcoming is that after the reaction is completed, the catalyst and excess isostearic acid in the product must be removed by alkali washing or pickling. Since pentaerythritol isostearate is a high-viscosity ester derived from long-chain saturated fatty acids, it is It is very easy to emulsify during washing, and it is difficult to separate layers, so it is difficult to perform normal layering operations. Even if the layers are barely separated, the acid value will not decrease significantly, but the yield of the product will be significantly reduced, and a large amount of waste water will be generated at the same time, which will pollute the environment. , this production method no longer meets the requirements of today's environmental protection policies and green chemistry

Since pentaerythritol has four hydroxyl groups, the steric hindrance effect is large and the esterification is difficult, so the esterification reaction time between polyols and fatty acids is long and the reaction temperature is high (about 200°C).

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