Preparation method of pentaerythritol tetraisostearate

Abstract

The invention provides a preparation method of pentaerythritol tetraisostearate. The preparation method specifically comprises the following steps: S1, taking pentaerythritol and isostearoyl chlorideaccording to a molar ratio of 1: (3.8-4.8), and putting the pentaerythritol and the isostearoyl chloride into a reaction kettle; and S2, carrying out a reaction for 0.5-12 h at a reaction temperatureof 80-150 DEG C under a vacuum pressure of-0.1 MPa to-0.05 MPa so as to obtain the pentaerythritol tetraisostearate product. The method does not need a catalyst; the reaction conditions are mild, thereaction temperature is greatly reduced, and a conventional enamel reaction kettle can be used; reaction time is short, and energy consumption is low; the product is light in color and high in quality; the method is simple in post-reaction treatment and suitable for industrialization.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a preparation method of pentaerythritol tetraisostearate. Background technique [0002] Pentaerythritol tetraisostearate is a colorless, odorless, transparent oil, which belongs to hindered ester. Pentaerythritol tetraisostearate has high thermal stability, and has functions such as film-forming, water-repellent, and emollient, and is a non-sticky moisturizer. At the same time, pentaerythritol tetraisostearate has good powder dispersibility and suspension, anti-sedimentation, and good skin-adherence. It is an excellent cosmetic additive and an excellent substitute for castor oil. [0003] The traditional preparation method is dehydration and esterification of pentaerythritol and isostearic acid at high temperature and normal pressure under the catalysis of protonic acid such as p-toluenesulfonic acid, etc. or Lewis acid such as ferric chloride. This metho...

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Problems solved by technology

[0004] 1. The reaction usually requires a higher reaction temperature (at least ≥140°C, most reports are 160-240°C) and a longer reaction time, which consumes a lot of energy and requires special equipment;

[0005] 2. When using an acidic catalyst, long-term high temperature will greatly shorten the life of the reactor;

[0006] 3. Esterification efficiency is often not high, either need to add excess acid to ensure complete esterification, resulting in the remaining acid is difficult to remove; or there will be a large amount of intermediate states such as pentaerythritol triisostearate residues;

[0007] 4. The color of the reaction solution is darker, and it is difficult to decolorize, which affects the product quality

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