| Due to environmental and resource problems have become more serious, so biodegradable synthetic base oils of vegetable research and development has been an important research focus. Although the US-led RLI based on the business use of genetically modified vegetable oil have been modified, it has made remarkable achievements in the development of biodegradable vegetable oils, vegetable oil base oil but because of the presence of two fatal weaknesses oxidation stability that is poor and high pour point, which greatly limits its industry more widely used. Xinjiang Fine Chemical Engineering Technology Research Center, represented by vegetable base oil, although the development team has achieved initial results in a vegetable base oil development, but also encountered the problem of the pour point is not ideal. Therefore, this article attempts to alkylate product and traditional depressant added and compounded with PAO and other measures to optimize the performance of vegetable base oils to provide practical basis for industrial applications of vegetable base oil.(1) Synthesis of Two alkylation productThe Friedel-Crafts alkylation of naphthalene and diphenyl with 1-hexene were carried out using methanesulfonic acid(MSA) as catalyst and hydroquinone as polymerization inhibitor. Single factor experiments were carried out to investigate the influence of the molar ratio of naphthalene and diphenyl to 1-hexene, the amount of MSA, reaction temperature and reaction time on the olefins conversion and the yield of product in order to obtain the optimal reaction conditions. The experimental results showed that after a 5h reaction time at 80℃, the yield of methylnaphthalene was 95.5% under the conditions of the molar ratio of naphthalene to 1-hexene of 1.3 and the molar ratio of MSA to 1-hexene of 1. The yield of Hexyl biphenyl was 96.3% under the conditions of the molar ratio of biphenyl to 1-hexene of 1:4 and the molar ratio of MSA to 1-hexene of 1. The results suggested that the synthetic base stock could be used as lubricant base fluid.(2) Effect of several alkylation product of vegetable base oil pour pointSoybean oil base oil 322 is heated to 100 deg.] C, respectively, according to the mass fraction of 0.1%, 0.3%, 0.5%, 0.8%, 1% added hexyl hexyl biphenyl and naphthyl, out constant stirring to cool to room temperature for 2h. Pour point test results showed that: alkyl naphthalene compound than biphenyl-alkyl compound is more effective to reduce the pour point of the base oil, octyl naphthalene base effect of oil pour more effective than hexyl naphthalene, in the amount of 0.8 %(wt), the base oil can pour point reduced from-9 ℃ to-17 ℃. Under the same conditions, if the number of alkyl carbon compound increases, pour point rise, not fall.(3) effects on pour points of vegetable base oil of two common depressant T803 B and 6100VThe rapeseed base oil 58, rapeseed base oil 85, rapeseed base oil 92, soybean base oil 230 were heated to 100 ℃, and added in depressant 6100 V and T803 B, and stirred 2h then cooled to room temperature. pour point, viscosity, flash point were tested. The results showed that: a vegetable base oil(rapeseed oil 58, rapeseed oil 85, rapeseed oil 92, soybean oil 230) to reduce the pour point depressant added value with △Sp amount T803 B and 6100 V increases, T803 B added in an amount of 0.5%(mass fraction), rapeseed oil and rapeseed oil 58 92 may reduce the pour point of 12℃. 6100 V added in an amount of 0.5%(mass fraction), the pour point of rapeseed oil 85 for 12℃. The best results. But the overall effect analysis T803 B than 6100 V of vegetable base oil pour slightly better. When 0.5% T803 B in rapeseed oil and 6100 V 58 dosage rapeseed oil, rapeseed oil viscosity index of 58 can be increased by 10, the best results. Also found, T803 B and 6100 V no effect on vegetable base oil flash point. Conclusion: The two pour point depressant for vegetable oil base oil can not only effectively lower the pour point, and can effectively improve the viscosity index to optimize the overall performance of vegetable base oil.(4) property effects of PAO to vegetable base oilsIn this paper, kinematic viscosities and pour points of mixed oils in different proportions of rapeseed base oil 92, soybean base oil 230, sunflower base oil 270( vegetable base oils) and PAO 4(4# poly-α-olefin synthetic oil) were determined, and the variation of viscosity and pour point with the proportions were studied. The results showed that the pour point of compound oil was-47℃ under the weight ratio 8:2 of rapeseed base oil 92 to PAO 4. A kind of base oil with good pour point and excellent kinematic viscosity was obtained. The kinematic viscosity of complex base oils of PAO with different viscosity varietied between the viscosity of the composition. Pour point test results showed: With the increase in the proportion PAO4 added,(92 rapeseed base oil, soybean oil base 230, the base oil sunflower 270) of cooking oil with a pour point PAO4 have appeared to decrease after increasing tendency to reduce the pour point value △Sp also increases. When PAO4 added in an amount of 25%(mass fraction) of rapeseed oil base oil base oil pour 92 to reconcile the best, then △Sp up to 21 ℃; when PAO4 added in an amount of 30%(mass fraction) when, for soybean oil base oil base oil pour 230 reconcile the best, then △Sp up to 19 ℃; when PAO4 added in an amount of 45%(by mass) of base oil sunflower oil down 270 basis reconcile condensate best, then △Sp up to 26 ℃; viscosity test results show that: high-temperature viscosity of the mixed base oil changes gently, for a particular system, with PAO4 viscosity increases monotonically decreasing mass fraction. Viscosity index base oil of three plant oils and have appeared first increased, then decreased. When PAO4 added in an amount of 25%(mass fraction) of rapeseed oil base oil base oil viscosity of 92 to reconcile the best improvement, the viscosity index increased from the 159 to 165; when PAO4 added in an amount of 40%(mass fraction), soybean oil base oil base oil viscosity of 230 to reconcile the best improvement, the viscosity index increased to 136 148; when PAO4 added in an amount of 45%(mass fraction), on the basis of sunflower oil to reconcile the 270 base oil viscosity improving effect preferably, the viscosity index increased from 135 to 144. |
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