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Synthesis of Coke Inhibitor Intermediate Phosphate |
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Abstract: Coke formation is a serious problem in the ethylene production process. Adding inhibitors into raw materials is an important method of inhibiting coke formation. Phosphorus ester-drewamine salt is an important coke inhibitor. In this study, phosphate was synthesized with phosphoric acid and iso-octanol, catalyzed by activated aluminum oxide, activated sodium sulfate and tungsten phosphoric acid. It is shown that tungsten phosphoric acid as catalyst gives the best results because of its high catalytic performance. The reaction conditions were shown to have a great effect on the yield of target product. The experiment results indicate that the optimum conditions are as follows: tungsten phosphate content of 5.0%, tungsten phosphoric acid as the catalyst, catalyst dosage of 2.0%, iso-octanol and acid molar ratio of 2.3, and the reaction time of 4 hours. The yield of phosphate was found to be 72.8% under the above conditions. IR spectra analysis shows that the product is indeed the target product phosphate.
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Received: 02 November 2009
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