Preparation method of malate with low chroma and low acid value

The invention discloses a preparation method of malate with low chroma and a low acid value. The preparation method comprises a step (1) of preparing n-butyl malate and a step (2) of preparing long-chain fatty alcohol malate. The method has the advantages that yield is high and reaches 95% or above; a catalyst is cheap and easy to obtain, and the dosage of the catalyst is small and accounts for about 0.5%-2% of the total weight of reaction raw materials; reaction conditions are mild, a reaction temperature does not exceed 140 DEG C, and reaction time is short; the obtained malic acid long-chain fatty alcohol ester is low in chromaticity and acid value and meets commercial standards; and the intermediate n-butyl malate can be used as a commercially available product. The method for preparing the long-chain fatty alcohol malate by adopting an ester exchange method has not been reported in related literatures and has creativity. 本发明公开了一种低色度低酸值苹果酸酯的制备方法，包括制备苹果酸正丁酯的步骤（1）和制备苹果酸长链脂肪醇酯（2）的步骤。本发明的优点是产率高，在95%以上，催化剂便宜易得