Impact of alkyl methacrylate–maleic anhydride–alkyl methacrylate terpolymers as cold flow improver on crystallization behavior of diesel fuel

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• 作者：Sheng Han ; Peng Wang ; Yuhong Wang ; Yuping Song ; Tianhui Ren
• 关键词：Alkyl methacrylate– ; maleic anhydride– ; alkyl methacrylate terpolymers ; Cold flow improver ; Crystallization ; Diesel fuel
• 刊名：Process Safety and Environmental Protection
• 出版年：2010
• 出版时间：January 2010
• 年：2010
• 卷：88
• 期：1
• 页码：41-46
• 全文大小：364 K

文摘

Alkyl methacrylate–maleic anhydride–alkyl methacrylate terpolymers (MR₁–MA–MR₂) is one of the widely used cold flow improver. In order to develop more efficient MR₁–MA–MR₂, it is necessary to study the crystallization behavior of n-alkanes when adding MR₁–MA–MR₂ into diesel fuel. In this paper, MR₁–MA–MR₂ is prepared by the reaction of long-chain alkyl methacrylate (MR₁), maleic anhydride (MA), and short alkyl methacrylate (MR₂). The diesel fuel before and after adding MR₁–MA–MR₂ is in situ filtrated at its cold filter plugging point (CFPP) in a manual CFPP apparatus. Extensive measurements of composition variation of n-alkanes are done by gas chromatograph and the results are compared. The experimental results show that after adding MR₁–MA–MR₂, the concentration distribution of n-alkanes in the filtrate is wide and arranges from 8 to 26, and mainly centralizes from 10 to 19. For the precipitate, the concentration distribution of n-alkanes gets richer in the lighter n-alkanes and poorer in the heavier n-alkanes. The concentration distribution of n-alkanes in the crystal solid shows a decreasing trend, especially with high carbon number n-alkanes (heavier than C₂₀). About 60–70 % of the residual crystal solid is composed of non-paraffins such as isoparaffin, naphthene and other components. Crystallinities of n-alkanes show a slow decrease trend from C₈ to C₂₀. When the carbon number n-alkanes are heavier than C₂₀, the crystallinities of n-alkanes begin to sharply reduce with an increase of carbon number. The largest decline of crystallinity is C₂₆ n-alkane from 38.39 % to 7.90 % .