薄膜蒸发与精馏耦合技术分离肉桂醛和乙酸肉桂酯

采用分子蒸馏技术和薄膜蒸发与精馏耦合技术分离肉桂醛和乙酸肉桂酯。在采用分子蒸馏分离肉桂醛和乙酸肉桂酯的实验研究基础上,重点阐述了薄膜蒸发与精馏耦合技术分离实验。首先研究了回流比对分离效果的影响,在确定回流比为2∶1后,分别以不同肉桂醛质量分数的混合物作为待分离物料,在不同蒸发器温度下进行了分离实验。对于具有相同肉桂醛质量分数的混合物料,薄膜蒸发与精馏耦合技术收集的馏出物中肉桂醛的含量普遍高于通过分子蒸馏技术收集的馏出物中肉桂醛的含量,实验结论表明薄膜蒸发与精馏耦合技术在分离挥发性相似物料方面具有更高的分离效率。     

用双锅串联蒸馏法提取肉桂油

从桂树的树皮，枝，叶中提取肉桂油，一般都采取单锅蒸馏的方法。本文介绍一种经技改后的，用双锅串联蒸馏的方法，节省能，操作稳定，效果良好。     

肉桂叶水扩散蒸馏提取肉桂油的研究

以肉桂叶为原料,在5 L不锈钢蒸馏釜中采用水扩散蒸馏提取肉桂油,考察了蒸馏时间、投料量、进口压力3个因素对肉桂油得油率的影响。结果表明,水扩散提取的适宜条件为:蒸馏时间90 min,投料量200 g/L,蒸汽进口压力为1 750 Pa,此时得油率为8.88‰,肉桂油的主要成分为肉桂醛(86.89%)、苯甲醛(1.55%)、乙酸肉桂酯(3.92%)、邻甲氧基肉桂醛(4.56%)。     

用双锅串联蒸馏法提取肉桂油

从桂树的树皮、枝、叶中提取肉桂油，一般都采取单锅蒸馏的方法。本文介绍一种经技改后的、用双锅串联蒸馏的方法，节省能耗，操作稳定，效果良好。     

分子蒸馏、薄膜蒸发与精馏耦合技术用于分离苯乙酮和α-苯乙醇的研究

苯乙酮是一种重要的有机化工原料,广泛地应用于食品、药品和化妆品等行业。工业上一般是以乙苯为原料、环烷酸锆为催化剂,通过空气氧化法合成苯乙酮,该反应容易生成α-苯乙醇等副产物。由于它们具有相似的物理化学性质,采用普通的蒸馏方法很难实现两种组分的分离。在前期研究的基础上,采用分子蒸馏、薄膜蒸发与精馏耦合技术对等质量混合的苯乙酮与α-苯乙醇混合物进行分离。首先对影响分离的因素如系统温度、压力和回流比对两种组分的得率和纯度的影响进行优化,分别得到轻、重两种组分。进一步对纯度高的苯乙酮混合物的分离工艺进行研究,通过优化系统温度、压力和回流比对混合物的分离进行研究。实验结果表明,经过两次分离后,苯乙酮的纯度从50%上升至99.12%,得率为80.23%。该研究为具有相近沸点的二元组分的分离提供了一定的参考。     

药用肉桂油精馏提纯生产工艺分析

通过分析影响药用肉桂油精馏提纯的关键生产要素,探讨最佳生产工艺,指导精馏提纯的工业化生产,以提高产品得率和产品质量。     

肉桂醛分子蒸馏纯化工艺研究

利用分子蒸馏技术对肉桂油分离提纯肉桂醛工艺技术条件进行了研究。用GC-MS对分离物中肉桂醛含量进行分析,确定了用分子蒸馏技术分离提取高纯度、高收率的肉桂醛的适宜工艺条件为:蒸馏压力 100Pa、蒸馏温度 60℃、物料流量 1滴 /s、刮膜蒸馏转速 370~390r/min、冷却水温度 4~5℃。在此工艺条件下肉桂醛含量从原料的 88. 78%提高到 95. 17%,肉桂醛的收率为83. 08%。     

利用分子蒸馏技术再生废旧轧制油

重点介绍化工分子蒸馏技术原理,它是利用不同分子自由程差别来实现分离,是远离沸点的分离,区别于传统的化工蒸馏采用不同物质的沸点差实现分离;它是在传统蒸馏和真空技术发展基础上的一个创新技术,废旧轧制油是铝带箔生产企业在使用中被润滑油、液压油、机械杂质、水污染更换下来的废油。文章重点介绍利用分子蒸馏技术在再生废旧轧制油方面的成功运用。     

高效节能提取肉桂油新工艺的研究

本文介绍在利用肉桂枝、叶提取肉桂油过程中，添加复合助剂对原料进行预处理，采用水中蒸煮或水蒸气蒸馏工艺，进行单锅或多锅串联蒸馏，并采用高效油水分离技术，提高肉桂油产品得率和质量，节约能源，降低成本。本工艺技术适用于山区土法生产，也适用于工业化生产。     

中国肉桂油快速分离的新工艺及设备

将肉桂枝叶切碎后 ,用分凝器、冷凝器、油水分离器合理组合快速分离制备桂油 ,此法可使油水自动快速分离 ,操作简便 ,缩短提油时间 ,降低能耗。而且得油率高 ,油质量高     

应用分子蒸馏技术分离提纯玫瑰精油

应用刮膜式分子蒸馏装置对玫瑰精油的提纯进行了研究。考察了进料速率、进料温度、蒸发温度和刮膜器转速等因素对玫瑰精油分离效果的影响。通过试验,初步得到了工艺参数的范围:进料速率为50~70 mL/h,进料温度为53~60℃,蒸发温度Ⅰ为100~108℃,蒸发温度Ⅱ为120~130℃,操作压力1.5 Pa,刮膜器转速150~160r/m in,得到的玫瑰精油产品的纯度在86%以上,分离过程总收率大于60%,并为今后工艺参数优化奠定了基础。     

Preparation of high purity squalene from soybean oil deodorizer distillate with the combination of macroporous resin and thin-film evaporation coupling distillation

ABSTRACT

In this study, the combination of macroporous adsorbent resins (MARs) and thin-film evaporation coupling distillation (TFECD) was studied systematically, with aim to obtain high value-added squalene from soybean oil deodorizer distillate (SODD). Five types of resins (X-5, D-101, D4020, DM301, and AB-8) were first used to evaluate the adsorption/desorption properties of squalene. D101 resin exhibited higher adsorption/desorption capacities and desorption ratios for squalene based on static adsorption results among the tested resins. We further investigated the adsorption kinetics, isotherms, and thermodynamics with D101 resin as adsorbent. The adsorption of squalene on D101 was best fitted to pseudo-second-order kinetic model and the Langmuir equation. The dynamic adsorption and desorption indicated that similar results were observed in the static adsorption test. The purity of squalene was increased from 7.5 to 82.5% with the recovery up to 88.5% after separation on D101 column. The resin-refined sample was directly subjected to TFECD purification. Under optimized process parameters, the final product with purity of 98.5% and recovery yield of 76.5% was confirmed by high-performance liquid chromatography (HPLC) analysis. The present study provided an effective method for large-scale production of high purity squalene.     

水蒸气蒸馏提取桂叶精油中组分分布规律的研究

以苯甲醛、肉桂醛、苯丙醛、乙酸肉桂酯、邻甲氧基肉桂醛的提取率和含量为指标,通过单因素实验,探索粒度、提取时间、蒸馏温度等对水蒸气蒸馏提取桂叶精油的影响,并得出这五种组分的提取变化规律。进一步通过正交实验,以肉桂醛的提取率和含量分布为指标,优化了水蒸气提取肉桂有效成分的工艺条件：原料粒径20目,提取时间1.5 h,提取温度168 oC,肉桂醛的提取率和含量分别达到2.08%和91.50%。重复性实验的结论指出,该工艺所得的肉桂油品质良好,实验的重现性好。     

Separation of squalene from olive oil deodorizer distillate using short-path molecular distillation

Squalene was recovered from an olive oil deodorizer distillate (OODD) containing 40% of squalene by a two-step process. The first step was to esterify the free fatty acids (FFAs) to make them less volatile. The second step was to separate the squalene by molecular distillation. The best esterification conditions were found to be 190°C and 360 min, where FFA content of the reaction mixture was reduced from 49.3% to 7.9%, however, an inevitable squalene loss (30%) was also observed due to a discontinuous operation. The remaining squalene (28%) in the esterified mixture was then distilled using a molecular distillation unit at elevated temperatures (190–230°C) and pressures (0.05–5 mmHg). When the temperature and vacuum during distillation increased, FFA content in the distillate reduced while distillate yield and squalene purity increased. The highest distillate yield (27.7%) and squalene purity (98.1%) were obtained at the highest applied temperature (230°C) under the lowest absolute pressure (0.05 mmHg), where FFA content of distillate was measured as 1.8%. High percentage of squalene (95%–98%) could be distilled at 230°C between 0.05 and 0.5 mmHg absolute pressures. The overall squalene recovery after all treatments was calculated as 68%.     

轧钢含油污泥湿式减压蒸馏处理工艺优化

使用湿式减压蒸馏法分离轧钢含油污泥的油分和残渣。采用二次通用旋转组合设计实验，研究了温度、真空度和水蒸气流量对分离效果的影响。结果表明，相比于简单蒸馏，湿式减压蒸馏能显著减轻对油分的破坏，提高油分回收率。在实验参数范围内，当蒸馏温度为321.4℃、真空度为90 kPa、水蒸气流量为1 ml·min⁻¹时，获得最大油分回收率（57.2%）。回收油分时，过高的温度和水蒸气分压会破坏油分，前者促进油分胶质组分向芳香烃和饱和烃转化，后者则会促进脂类水解，并与Fe₂O₃作用氧化重质油组分，促进胶质组分向芳香烃转化。而对于蒸馏残渣中难以分离的沥青质等大分子有机物，可通过提高温度和水蒸气流量，特别是可以提高温度，促使其分解炭化，以获得较低的残渣含油率，便于残渣中铁金属元素的回收利用。     

甲苯二异氰酸酯单体的薄膜蒸发分离工艺

通过实验比较了3种甲苯二异氰酸酯-三羟甲基丙烷(TD I-TMP)预聚物中游离TD I单体分离的工艺,发现采用减压蒸馏和内冷式薄膜蒸发联用的工艺路线,不仅能保证物料在蒸发器系统中有较好的流动性,而且能保证TD I单体蒸气在高真空和刮板的搅动下极易从物料中蒸发出来,最终含量可降低到质量分数0.5%以下。实验还发现高真空内冷式刮膜薄膜蒸发分离预聚物中游离单体的关键因素是物料温度、压力和粘度的控制,它们最适宜的控制范围为:物料温度100—120℃、压力50—150 Pa、粘度500—1500 mPa.s。     

内冷式薄膜蒸馏装置性能研究

研制了一套 0 .0 2m2 内冷式薄膜蒸馏小试装置。通过十二醇、十六醇的小试试验 ,考察了装置的工艺性能 ,并根据对试验结果的分析 ,考察了影响蒸馏过程的因素。分析表明最佳操作条件的选取应综合考虑操作温度、残气压力对蒸馏速率及分离因数的影响。针对本装置 ,提高蒸馏效果的关键在于增大冷凝面积 ,降低残气压力和装设有效的汽液分离器     

Separation of bio-oil by molecular distillation

In this study, KDL5 molecular distillation apparatus manufactured by the UIC Corporation was adopted to separate bio-oil, which came from a bench-scale fluidized-bed fast pyrolysis reactor at a feeding rate of 1 kg/h. A maximum distillate yield of 85% was obtained without obvious coking or polymerization during the molecular distillation process. The effect of distillation temperature on physical and chemical characterization of each bio-oil fraction was investigated. Statistical calculations showed that molecular distillation was successful in the separation of bio-oil. A separation factor was proposed to reflect the ability of isolating the chemicals contained in the bio-oil using molecular distillation.     

萃取精馏分离D40溶剂油中C_8—C_(12)异构烷烃

异构烷烃是一类环境友好的溶剂油,用途广泛。以南京炼油厂的溶剂油D40为研究对象,分别考察了加入环丁砜、邻苯二甲酸二甲酯和三甘醇3种萃取剂后,从D40中萃取精馏分离C8—C12异构烷烃的效果。其中,环丁砜的分离效果最好,在剂油比(体积比)为5∶1的条件下,D40汽相中异构烷烃的质量分数从无溶剂时的16.65%提高到27.51%,相对挥发度达到1.151。在单溶剂的基础上考察双组分萃取剂,其中,采用环丁砜和邻苯二甲酸二甲酯(体积比1∶1)双组分萃取剂,相对挥发度最大,达到2.895。