不同聚合度的聚甲氧基二甲醚对柴油性能的影响

doi:10.16085/j.issn.1000-6613.2019-1004

摘要/Abstract

摘要：

聚甲氧基二甲醚（DMM_n）具有氧含量和十六烷值高的优点，将其与柴油混配可有效提高柴油的燃烧性能，降低尾气中污染物的排放。因聚合度为5～8的DMM_n常温下为固态，不易与柴油互溶，影响柴油低温流动性，所以选择聚合度为1～4的DMM_n与0^#柴油进行调和。通过将单组分DMM₁～DMM₄和DMM_1~4混合组分分别按照7个不同的质量比与0^#柴油调和，并考察对柴油凝点、密度、运动黏度及动力黏度的影响。结果表明：单组分DMM₁~DMM₄和DMM_1~4混合组分调和柴油后均可以显著降低柴油的凝点，21%的DMM₁调和0^#柴油时降凝效果最好为降低6℃。根据调和柴油性质对比0^#柴油国Ⅵ标准，使密度和黏度保持在标准范围内，得到最优降凝的调和比例为9%DMM₁、12%DMM₂和18%DMM_1~4，最后通过对最优降凝调和柴油进行十六烷值和闪点以及红外光谱和质谱检测，确定18%的混合DMM_1~4为最优配比，为实际柴油调和提供参考。

关键词: 混合物, 聚合物, 优化, 聚甲氧基二甲醚, 柴油调和组分, 凝点, 密度, 黏度

Abstract:

Polymethoxy dimethyl ether (DMM_n) has the advantages of high oxygen content and high cetane number. Mixing it with diesel can effectively improve the combustion performance of diesel and reduce the emission of pollutants in exhaust gas. DMM_n with a polymerization degree of 5—8 is solid at room temperature, and is not easily miscible with diesel, which affects the low-temperature fluidity of diesel. Therefore, DMM_n with a polymerization degree of 1—4 is selected to be blended with 0^# diesel. The single component DMM₁—DMM₄ and DMM_1-4 mixed components were mixed with 0^#diesel oil according to 7 different mass ratios, and the effects on diesel gel point, density, kinematic viscosity and dynamic viscosity were investigated. The results showed that the single component DMM₁—DMM₄ and DMM_1-4 mixed components could significantly reduce the freezing point of diesel after blending with diesel. The best effect was to reduce 6℃ when the 21% DMM₁ was blended with 0^# diesel. According to the characteristics of blending diesel oil, the density and viscosity of the 0^# diesel were kept within the national standard range for diesel(Ⅵ), and the optimal condensation for depressing the freezing point was 9% DMM₁, 12% DMM₂ and 18% DMM_1-4 respectively. Finally, the optimum condensation of 18% mixed DMM_1-4 was determined by the cetane number, flash point and the infrared spectrum and mass spectrometry detection, which provided a reference for the actual diesel blending.

Key words: mixtures, polymers, optimization, polymethoxy dimethyl ether, diesel blending component, condensation point, density, viscosity

中图分类号:

TQ22

李燊,袁梦,张志美,乔英云,田原宇. 不同聚合度的聚甲氧基二甲醚对柴油性能的影响[J]. 化工进展, 2020, 39(3): 947-955.

Shen LI,Meng YUAN,Zhimei ZHANG,Yingyun QIAO,Yuanyu TIAN. Effect of polymethoxy dimethyl ether with different polymerization degrees on diesel performance[J]. Chemical Industry and Engineering Progress, 2020, 39(3): 947-955.

图/表 18

参考文献 20

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试剂名称	规格	试剂来源
0^#柴油	国Ⅵ标准	青岛市中石化加油站
DMM₁	分析纯	山东西亚化学股份有限公司
DMM₂～DMM₄	普通	实验室自制
石油醚	分析纯	国药集团化学试剂有限公司
无水乙醇	分析纯	天津科密欧化学试剂开发中心

试剂名称	规格	试剂来源
0^#柴油	国Ⅵ标准	青岛市中石化加油站
DMM₁	分析纯	山东西亚化学股份有限公司
DMM₂～DMM₄	普通	实验室自制
石油醚	分析纯	国药集团化学试剂有限公司
无水乙醇	分析纯	天津科密欧化学试剂开发中心

仪器名称	规格与型号	产地
凝点测定仪	BN-008	大连邦能石油仪器有限公司
专用制冷器	—	大连邦能石油仪器有限公司
安东帕斯塔宾格黏度密度仪	SVM^TM3001	安东帕上海设备有限公司
傅里叶变换红外光谱仪	TENSOR 37	德国Bruker公司
SCION SQ GC-MS	SCION 436	英国SCION仪器公司
恒温水槽	BN-013	大连邦能石油仪器有限公司
圆底试管	高160mm，内径20mm	长沙思辰仪器科技有限公司
圆底玻璃套管	高130mm，内径40mm	长沙思辰仪器科技有限公司
液体温度计	量程-100~100℃	常州鹏程热工仪表厂
烧杯	250mL蜀玻	青岛蓝特恩仪器设备有限公司

仪器名称	规格与型号	产地
凝点测定仪	BN-008	大连邦能石油仪器有限公司
专用制冷器	—	大连邦能石油仪器有限公司
安东帕斯塔宾格黏度密度仪	SVM^TM3001	安东帕上海设备有限公司
傅里叶变换红外光谱仪	TENSOR 37	德国Bruker公司
SCION SQ GC-MS	SCION 436	英国SCION仪器公司
恒温水槽	BN-013	大连邦能石油仪器有限公司
圆底试管	高160mm，内径20mm	长沙思辰仪器科技有限公司
圆底玻璃套管	高130mm，内径40mm	长沙思辰仪器科技有限公司
液体温度计	量程-100~100℃	常州鹏程热工仪表厂
烧杯	250mL蜀玻	青岛蓝特恩仪器设备有限公司

组分名称	组成	纯度
DMM₁	0.01%杂质， 99.9% DMM₁	99.9%
DMM₂	2% DMM₁, 98%DMM₂	98%
DMM₃	3% DMM₁, 0.5%DMM₂, 96.5% DMM₃	96.5%
DMM₄	2.5% CH₂O, 0.3% DMM₁, 0.2%DMM₂, 97% DMM₄	97%