Method for synthesizing 2-ethylhexyl phosphonic acid di (2-ethyl) hexyl ester by using sodium 2-ethylhexanol as alkali

The invention discloses a method for synthesizing bis (2-ethyl) hexyl 2-ethylhexyl phosphonate by taking sodium 2-ethyl hexanol as alkali, which comprises the following steps: firstly, reacting sodium 2-ethyl hexanol with bis (2-ethyl) hexyl phosphonate to generate bis (2-ethyl) hexyl phosphonate sodium salt; and reacting the phosphonite bis (2-ethyl) hexyl ester sodium salt with 1-chloro-2-ethylhexane to obtain the 2-ethylhexyl phosphonic acid bis (2-ethyl) hexyl ester. According to the method, the use of sodium ethoxide is avoided, the types of raw materials are reduced, the production process is simplified, the production efficiency is improved, the product quality is improved, and the safety risk is reduced, the 2-ethylhexanol used in the method is a raw material for synthesizing the di (2-ethyl) hexyl phosphonite, and the excessive part of the 2-ethylhexanol can be repeatedly used. 本发明公开了一种以2-乙基己醇钠为碱合成2-乙基己基膦酸二(2-乙基)己基酯的方法，首先2-乙基己醇钠与亚膦酸二(2-乙基)己基酯反应，生成亚膦酸二(2-乙基)己基酯钠盐，亚膦酸二(2-乙基)己基酯钠盐再与1-氯-2-乙基己烷反应得到2-乙基己基膦