共查询到18条相似文献,搜索用时 62 毫秒
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为改善油脂可塑性和口溶性,及为开发以棕榈油产品为主要原料专用油脂产品提供理论依据,研究棕榈油硬脂(PSt)、棕榈油中间分提物(PMF)两者间相容性。测定二元混合体系固体脂肪含量(SFC)值,并通过计算其理论值与实测值之间差值△SFC,结合T–△SFC曲线、二元等温曲线等直观分析,结果表明:PSt与PMF混合物在25℃、PSt含量为30%~50%时,二者间偏晶现象严重;而在35℃~50℃时,二者间共晶现象较为严重;在0℃~10℃和30℃~35℃范围内,二者间具有较好相容性。 相似文献
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为扩大棕榈油中间分提物(PMF)在零/低反式脂肪酸人造奶油中的应用,对PMF、棕榈油硬脂(PSt)和大豆油的甘三酯组成、结晶及熔化特性进行分析。结果表明:PMF的甘三酯主要由二饱和型及单饱和型甘三酯POP、PLP、POO组成;PSt的甘三酯主要由三饱和型及二饱和型甘三酯PPP、POP组成;大豆油主要由三不饱和型及二不饱和型甘三酯LLL、OLL、PLL等组成。以PMF为主,复配PSt和大豆油作为人造奶油的基料油,可使人造奶油以二饱和型POP等形成β'结晶倾向,一定量的三饱和型甘三酯PPP等提供人造奶油的骨架结构,三不饱和型甘三酯LLL、OLL等填充高熔点甘三酯形成的网格,提高人造奶油的营养特性。PMF、PSt和大豆油三者的质量比为50∶30∶20时表现出良好的相容特性,按照这一质量比制备的人造奶油中的晶型为β'和β共存,且以β'为主,符合人造奶油的结晶及熔化性能要求。 相似文献
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对棕榈硬脂的干法分提,通过实践分析了原料油温度、原料组成、结晶设备影响、冷却水温度控制及过滤的影响因素,给出相关的技术参数,以期为实际生产提供参考. 相似文献
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棕榈油干法分提的工艺实践与研究 总被引:2,自引:1,他引:2
采用干法分提工艺对棕榈油进行分提,通过实践分析了工艺中结晶设备、原料组成、冷却状况、晶体异构对冷却结晶过程的影响,研究了压滤过程中的影响因素,给出了相关的技术参数,以期为实际生产提供指导和参考. 相似文献
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为开发代可可脂系列产品,介绍了采用油盘冷房结晶-高压膜压滤机过滤的精炼棕榈仁油干法分提生产棕榈仁硬脂工艺。对该工艺操作控制要点进行了说明,并对生产中的一些问题进行了讨论,将该工艺制备的棕榈仁硬脂及其氢化硬脂与天然可可脂和商业氢化棕榈仁硬脂代可可脂产品质量进行了对比。原料油主要质量指标为酸值(KOH)≤0.3 mg/g、碘值(I)16~19 g/100 g、熔点25~28℃和固体脂肪含量(25℃)≥18%。适合的工艺条件为预冷温度29~30℃,预冷时间3 h,冷房温度17~19℃,冷房结晶时间6~8 h,油结晶温度25~27℃,过滤压力0~0.3 MPa、挤压压力1.6~1.8 MPa。产品主要质量指标为酸值(KOH)≤0.3 mg/g、碘值(I)5.6~7.5 g/100 g、熔点30~34℃、固体脂肪含量(30℃) 34%~44%。采用该工艺所得棕榈仁硬脂的熔点和固体脂肪含量与天然可可脂相当,氢化后产品在25~30℃的固体脂肪含量高于商业氢化棕榈仁硬脂代可可脂。 相似文献
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干式分提是油脂物理改性过程,可得到高碘值的棕榈油(IV65和IV71)和高饱和度的棕榈硬脂。随着结晶罐结构(带超冷)的改进和膜式过滤机的使用,缩短了结晶时间,提高了液体油的得率和硬脂的纯度,使用PLC系统可准确控制结晶过程和过滤过程,降低分提成本。 相似文献
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Nor Aini Idris Kurt G Berger Augustine S H Ong 《Journal of the science of food and agriculture》1989,46(4):481-493
Several formulations based on blends of hydrogenated palm oil (MP 41·5°C) and palm stearin (IV 44) with other liquid oils, on direct blends of palm stearin with other liquid oils, and on 100% inter-esterified palm olein, were used as feedstocks in shortening production. The shortenings were stored at 20°C over a period of one month. Physicochemical characteristics, creaming properties and baking performance of the shortenings were evaluated and compared with the best shortening on the market. Slip melting point of the shortenings ranged from 41·5 to 46·4°C. Palm-cottonseed oil shortenings had higher solid fat contents at all temperatures than palm-soya bean or palm-low erucic acid rapeseed oil shortenings. The shortenings were rich in C50, C52and C54 glycerides. Creaming power after 12 min of beating ranged from 1·55 to 1·77 cm3 g?1. Palm stearin-cottonseed (3:2) oil shortening showed the best creaming performance. The specific volume of cakes ranged, for the experimental shortening, from 90% to 101% from the control, with low erucic acid-palm blends showing the best performance. In applications for both aerated cream and cakes, inter-esterified palm olein was excellent. 相似文献
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ABSTRACT: High-oleic palm oil (HOPO) with an oleic acid content of 59.0% and an iodine value (IV) of 78.2 was crystallized in a 200-kg De Smet crystallizer with a predetermined cooling program and appropriate agitation. The slurry was then fractionated by means of dry fractionation at 4, 8, 10, 12, and 15 °C. The oil and the fractionated products were subjected to physical and chemical analyses, including fatty acid composition, triacylglycerol and diacylglycerol composition, solid fat content, cloud point, slip melting point, and cold stability test. Fractionation at 15 °C resulted in the highest olein yield but with minimal oleic acid content. Due to the enhanced unsaturation of the oil, fractionation at relatively lower crystallization temperature showed a considerable effect on fatty acid composition as well as triacylglycerol and diacylglycerol composition of liquid fractions compared to higher crystallization temperature. The olein and stearin fractionated at 4 °C had the best cold stability at 0 °C and sharper melting profile, respectively. 相似文献