Study On Synthesizing Pour Point Depressant For Diesel

On the ground of summarizing reference documents, the purpose of this paper lies on preparing and sifting better diesel flow improvers(DFI)for the Daqing 0# diesel, and the better conditions of the best PPD for Daqing 0# diesel were investigated in this paper. Liquid paraffin were produced by urea complex from the Daqing 0# diesel, and the carbon distribution was investigated. The results showed that the largest of percentages was n-17 in the Daqing 0# diesel, the content of the n-16 and n-18 was in close, the content of everyone was lower than n-17, the content of n-17, n-16 and n-18 were 36.7%, the percentage of C15~C21 was 75%,the average relative molecular weight of n-alkanes in Daqing 0# diesel was 250.50, and the average number of carbon atoms was 17.75.The best dose of MAm-St was 0.5%, MAm-St(Styrene- Maleic anhydride mixed ester) could reduce the pour point of Daqing 0# diesel 10 degrees. The best synthesis conditions of MAm-St were: the ratio of the 14alcohol: 16 alcohol: 18 alcohol was 1:3:2, the amount of catalyst was 1.2%, the reaction time was 7h, the ratio of the Maleic anhydride mixed ester : Styrene was 2:1, and the amount of initiatorwas 1.0%.The best dose of PA was 0.5%, PA(poly octadecyl acrylate) could reduce the pour point of Daqing 0# diesel 10 degrees. The best synthesis conditions of octadecyl acrylate was: octadecyl /alcohol was 1.2:1, the amount of catalyst was 1.0%, the reaction temperature was 120℃, the dosage of toluene used for carrying water was 45% of the total acid alcohol and the reaction time was 6 h. The best synthesis conditions of octadecyl acrylate PA was that the reaction temperature was 80℃, the reaction time was 5 h , the dosage of hydroquinone used for inhibitor was 0.6% of the total acid alcohol, and the dosage of initiator was 1.0%.Combinating MAm-St,PA and EVA, When the dose of PPD was 0.5%, the ratio of MS:T was 1:4, the Daqing 0# diesel was decreased by 17℃; When the dose of PPD was 0.5%, the ratio of PA:T was 1:4, the Daqing 0# diesel was decreased by 18℃. Researching on the placed time, there was no rebound phenomenon, indicating that the compound effect of PPD MAm-St, PA and commercial pour point depressant T was stable.