2019年10月23日星期三

Monoalkyl Phosphate Preparation by Cesium Phosphotungstate

Monoalkyl phosphate is an important surfactant, widely used in chemical fiber, textile, leather, plastics, paper making and cosmetics. 

Monoalkyl phosphate usually synthesized by the esterification of phosphoric acid with aliphatic alcohols by esterification. The commonly used phosphorus agents are three oxychloride (POCl3) and phosphoric acid.

When phosphorus oxychloride is used as an agent for HCL, it is easy to cause environmental pollution, when phosphoric acid is used as a phosphate agent, although it is environmentally friendly, it is difficult to synthesize monoester, diester and three ester because of the low activity of phosphoric acid. Is there a way to improve the activity of phosphoric acid to help balance the benefits of the environment?

monoalkyl phosphate preparation image

Cesium phosphotungstate is a kind of heteropoly acid. It is a new type of multifunctional catalyst. It has not only oxidation reduction property, but also high catalytic activity and good stability, it can be used for homogeneous and heterogeneous reactions, and even can be used as phase transfer catalyst, the most important thing is that it is pollution-free to the environment. Some scholars have studied the synthesis of mono twelve alkyl phosphate by the direct esterification of lauryl alcohol and 85% phosphoric acid with cesium phosphotungstate as catalyst. Through investigation, we found that cesium phosphotungstate in the reaction process showed very high activity during the catalytic reaction, under the catalytic action of cesium phosphotungstate, the selectivity of MAP is 90% with the attraction between lauryl alcohol and phosphoric acid, a single twelve alkyl phosphate has been successfully synthesized. The effect is not weaker than three phosphorus oxychloride (POCl3). The most important is that it is safer and more environmentally friendly with phosphoric acid.

Over the years, cesium phosphotungstate has been recognized more and more by virtue of its excellent catalytic performance and non-toxic and harmless strength. So, when you're not satisfied with the catalytic effect of a certain chemical, you might be able to try cesium phosphotungstate.

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