废白土中油脂回收与废白土的再生利用

对废白土中油脂的回收和废白土的再生利用进行了研究。通过对废白土浸出、油脂的回收及废白土的焙烧、酸洗等再生工艺条件最优化,使油脂的回收率达到84%。结果表明,经脱色后的废白土,不宜放置时间过长,否则回收利用价值下降。废白土的最佳再生工艺条件为:焙烧时间60min、酸洗浓度7%、残油率4·31%。用再生白土和新白土对3种不同油脂进行脱色试验,再生白土的脱色力接近新白土,证明了再生白土作为吸附剂是可行的。     

油脂脱色废白土再生工艺的研究

以油脂生产中的脱色废白土为原料,制备再生白土.通过对废白土中油脂回收,再对去油白土进行焙烧和酸洗.通过实验确定的最佳再生条件为:焙烧时间60min,硫酸酸化的浓度7%,水洗至pH 4.5.在此条件下再生白土脱色率最好,可达到98.2%.     

油脂精炼废白土中油脂回收和废白土再生工艺的研究

为了更好地利用废白土增加效益,利用自行设计的一种新型三段式浸出器,对油脂脱色废白土中油脂的回收工艺及影响因素进行了研究。结果表明,用该工艺回收后的油脂品质好,能达到食用标准,且回收后的废白土残油量小于5％。在此基础上利用自行设计的两段白土再生器将二次废白土再生。     

废白土中油脂回收与废白土的再生利用

对废白土中油脂的回收和废白土的再生利用进行了研究。通过对废白土浸出、油脂的回收及废白土的焙烧、酸洗等再生工艺条件最优化，使油脂的回收率达到84％。结果表明，经脱色后的废白土，不宜放置时间过长，否则回收利用价值下降。废白土的最佳再生工艺条件为：焙烧时间60min、酸洗浓度7％、残油率4．31％。用再生白土和新白土对3种不同油脂进行脱色试验，再生白土的脱色力接近新白土，证明了再生白土作为吸附剂是可行的。     

从油脂脱色废白土中回收油脂的研究

简述了从油脂脱色废白土中回收油脂的几种方法,并在小试、中试的研究过程中重点探索了溶剂法回收油脂脱色废白土中油脂的工艺效果及影响因素,证实了溶剂法是一种能应用于生产的有效方法     

废白土中油脂回收工艺与实践

以蓖麻油脱色后的废白土为原料,利用自行设计制造的专业提油设备,采用6#溶剂浸出工艺回收废白土中的油脂.工艺操作稳定,回收的油脂通过精炼可达到国际1#蓖麻油标准,脱油后的废白土残油量小于5%.介绍了专业提油设备的结构和工艺流程,讨论了生产实践中作业温度、萃取次数等因素对浸出效果的影响.     

改良水剂法对脱色废白土油脂回收效果研究

采用表面活性剂与传统水剂法相结合方法对回收脱色废白土油脂效果进行研究.试验结果表明,回收脱色废白土油脂最优工艺为:碳酸钠添加量0.3％、提取温度95℃、提取时间35 min、表面活性剂为OS-15,在此条件下,脱色废白土油脂回收率可达96.72％.     

废白土中回收油脂的研究与应用

根据试验以及由此而设计的废白土回收油脂工艺的实际应用 ,表明了在实际生产当中 ,废白土回收油脂是可行的。通常油厂均设有榨油和精炼车间 ,完全可能将精炼产生的废白土中残存的油脂提取出来 ,产生二次效益。因此 ,该研究具有一定的理论价值和现实意义。     

废白土中回收油脂的研究与应用

根据试验以及由此而设计的废白土回收油脂工艺的实际应用，表明了在实际生产当中。废白土回收油脂是可行的。通常油厂均设有榨油和精炼车间，完全可能将精炼产生的废白土中残存的油脂提取出来，产生二次效益。因此，该研究具有一定的理论价值和现实意义。     

油脂精炼废白土的利用

油脂精炼过程中,通常使用油重2%～5%的活性白土进行吸附脱色,脱色后的废白土若处理不及时,会造成环境污染.为了加强对脱色废白土的再利用,可采用压榨法、溶剂法和水剂法对其中的油脂提取回收,或者直接用作制备去污粉、洗涤膏的原料、用作饲料添加剂和直接用作生物培养基生产核黄素,也可对其进行酸化活化处理后用作农药、重金属脱除吸附剂,还可进行复配制成有机肥料用于农业生产中.利用以上途径,可变废为宝,使脱色废白土得到充分的利用,减少对环境的污染,增加油脂企业的经济效益.     

Effects of Bleaching on the Properties of Roasted Sesame Oil

ABSTRACT: Improvement in quality of roasted sesame oil was studied. Roasted sesame oil was bleached at 70 °C, 85 °C, or 100 °C for 20 min with acid-activated clay at 0.5%, 1.0%, or 3.0% (w/w) and then centrifuging at 12096 × g at 4 °C for 10 min. The color of the roasted sesame oil became lighter and the viscosity of oil decreased by bleaching. Bleaching caused a significant increase in the smoke point of the oil, from 170 °C to a range of 183 °C to 191 °C. Bleaching increased palmitic acid and decreased linoleic acid contents of roasted sesame oil. Bleaching decreased free fatty acid (FFA) and conjugated dienoic acid (CDA) contents and carbonyl values (CV) of roasted sesame oil. The more the acid clay was used, the lower were the FFA and CDA contents and CV of the oil. Amount of acid clay in bleaching of roasted sesame oil had higher effects on the color, viscosity, smoke point, FFA and CDA contents, and CV of roasted sesame oil than the bleaching temperature. Bleaching did not show a significant effect on tocopherol contents of the sesame oil. Bleaching tended to decrease sesamolin contents and increase sesamol contents in the roasted sesame oil. As the amount of acid clay and the bleaching temperature increased, the contents of sesamin and sesamolin in the oil decreased while sesamol contents increased.     

Inter-laboratory comparison of polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) in bleaching earth used in the refinement of edible oils

Bleaching earth (dried, powdered, bentonite-montmorillonite clay) is commonly used as a processing aid in edible oil refinement. Used bleaching earth may be incorporated into animal feed indirectly, for example because it is included into seed meal, or directly (e.g., as a binding agent). Control must be demonstrated to ensure that the levels of polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) in feed ingredients do not infringe European Community regulations. The low legislative action level assigned is analytically challenging and may be at or below the limits of quantification achievable by many laboratories. A statistical comparison (following the IUPAC/ISO/AOAC protocol) was made of analyses of PCDDs and PCDFs in selected bleaching earth samples by laboratories from Europe and the USA to assess the comparability of data. Of 19 sets of results submitted by laboratories for replicate samples, 11 demonstrated acceptable agreement.     

Carbonaceous materials from seed hulls for bleaching of vegetable oils

Seed hulls, namely cottonseed, peanut, sunflower, soybean, faba bean and lupine were evaluated as carbonaceous materials for the bleaching of crude soybean oil. The six seed hulls were activated by carbonization, steam activation and acid activation. Two reference standards, Fullers earth and Tonsil clay, were used for comparison throughout the whole study. Bleaching of crude soybean oil under vacuum at 100 °C using the treated hulls was carried out. The effect of bleaching with the different hulls on the oil characteristics was evaluated by determining the % free fatty acid, % reduction in peroxide value, % removal of phospholipids, % bleachability and oxidative stability of the bleached oils. Results revealed that bleaching with carbonized hull yielded oils with least free fatty acid content and highest oxidative stability. Bleaching with acid activated hull carbons gave oils with least content of peroxides, phospholipids together with best color. Acid activation of the hulls resulted in highest increase in surface area, pore volume and least pore dimension.     

The effects of physical refining on the formation of 3-monochloropropane-1,2-diol esters in relation to palm oil minor components

The formation of 3-monochloropropane-1,2-diol (3-MCPD) esters in refined palm oil during deodorisation is attributed to the intrinsic composition of crude palm oil. Utilising D-optimal design, the effects of the degumming and bleaching processes on the reduction in 3-MCPD ester formation in refined palm oil from poor-quality crude palm oil were studied relative to the palm oil minor components that are likely to be their precursors. Water degumming remarkably reduced 3-MCPD ester formation by up to 84%, from 9.79 mg/kg to 1.55 mg/kg. Bleaching with synthetic magnesium silicate caused a further 10% reduction, to 0.487 mg/kg. The reduction in 3-MCPD ester formation could be due to the removal of related precursors prior to the deodorisation step. The phosphorus content of bleached palm oil showed a significant correlation with 3-MCPD ester formation.     

慈竹化机浆漂白性能研究

对慈竹单段漂白和多段组合漂白性能进行了系统研究,提出了慈竹化机浆漂白至71%以上白度的工艺。研究结果表明,H2O2总用量10%,慈竹化机浆经单段H2O2漂白,白度只能达到64.7%~65.0%;两段H2O2漂白具有较高的漂白效率,漂白浆白度达到66.6%~67.1%;总漂剂用量为12%的三段组合漂白,结束段分别使用H2O2、FAS和Na2S2O4不同漂白方式,FAS漂白效率最优,白度达到72.9%;其次是H2O2漂白,白度为71.9%;以FAS为结束段的漂白,与本色慈竹化机浆相比,抗张指数、耐破指数和撕裂指数分别提高200%~300%、250%~300%和250%~270%。采用碱性Na2SO3化学预浸渍,两段H2O2漂白加一段FAS漂白的三段组合漂白,慈竹化机浆可漂白至71%以上的白度。     

油脂脱色过程中吸附剂对色素及微量成分的影响

油脂脱色过程是食用植物油加工的重要过程,它不仅对色素起到脱除作用,同时对油脂TOTOX值、磷、皂、生育酚都产生重要影响,这也是影响油脂品质的重要因素.研究发现,不同吸附剂对油脂脱色过程色素、磷、皂具有明显的差异,同时在TOTOX值变化也具有明显不同,这也表明油脂脱色过程对油脂品质、氧化稳定性都具有重要影响.     

Preparation and characterization of composite sodium caseinate edible films incorporating naturally emulsified oil bodies

Oil bodies in the form of a naturally emulsified emulsion were recovered from maize germ by applying aqueous extraction and were then exploited in the preparation of composite sodium caseinate-based films. Following equilibration of the initial film-forming dispersion, the caseinate molecules appeared to adsorb to the oil droplet surface facilitating thus the dispersion of the latter in the protein solution. During the course of film formation partial destabilization of oil body dispersion took place as a result of depletion by non-adsorbed caseinate. The finally formed composite films differed from the control, both in their surface characteristics as well in physicochemical and tensile properties. The oil-incorporating films were less transparent, less hydrophilic and, as a result, more resistant to water sorption and vapor permeation than the oil-free caseinate films. In addition, the composite films exhibited higher flexibility and lower stiffness. These findings are discussed in terms of the formation during the drying step of a composite caseinate-based phase separated structure embedded with oil bodies having their surface in intimate association with the protein molecules of the continuous protein matrix.     

响应面法优化冷鲜肉复合保鲜剂研究

以猪背最长肌为原料,在单因素实验的基础上,利用响应面分析法,研究了桂皮油、丁香油和茶多酚对冷鲜肉的保鲜效果,确定了冷鲜肉复合保鲜剂中各种组分的最适添加比例,实验结果表明,冷鲜肉中桂皮油、丁香油和茶多酚3种抗菌材料添加量分别为0.11%、0.16%、0.21%。利用此复合保鲜剂应用于肉的保鲜,在贮藏温度为0～4℃时贮藏时间可达17d。     

FILTRATION AND FILTER SYSTEM FOR TREATED FRYING OIL

Used canola oil was treated with commercially available adsorbents (HB 600, Magnasol, and Frypowder) and a UGA blend for flow rate study and oil quality improvement. Viscosity measurements of fresh and used oil indicated that the oil temperature >140C was best suited for active filtration. One percent adsorbent gave better flow rates than 2% except for Frypowder, which showed no difference in flow rates. All the adsorbents significantly improved the oil quality. Most significant improvement was observed in FFA values (15–20% and 24–35% for 1% and 2% adsorbent level, respectively) except for Frypowder, which resulted in least improvement (4 to 7%). Neither increasing the duration of treatment, prior to filtration, from 3 to 6 min, with 3% UGA blend, nor the multipass filtration treatment showed any significant improvement in oil quality. Pressure system was more promising for active filtration than vacuum and gravity systems.     

甲基纤维素对大豆分离蛋白乳浊液稳定性影响的研究

本文研究了甲基纤维素对大豆分离蛋白乳浊液稳定性的影响。研究结果表明，在低浓度时，甲基纤维素增加了体系的稳定性，对NaCl引起的液滴絮凝也有很好的抑制作用。而高浓度的甲基纤维素导致pH6．5和7．0的体系同时发生乳析和蛋白质沉积现象。其作用机理可能是，在低浓度时甲基纤维素吸附到液滴蛋白质层的外围形成次级保护层，增加了体系的稳定性，而高浓度时则可能置换出液滴的蛋白质吸附层。