共查询到19条相似文献,搜索用时 156 毫秒
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概述了国内外对松脂加工废水治理的研究情况,系统分析了松脂加工废水的来源及特点,介绍松脂加工废水治理方面的成功方法和经验,通过分析生产过程的监控数据,为我国松香行业的污水处理提供了经验和依据。 相似文献
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尤溪县是福建省松香重点产区,年产松脂4000多吨,建厂三十四年来计产松脂10万多吨。近年来,由于松脂资源的龄级发生变化,松脂产量下降10~20%。而1989年来松脂提价,对中幼林逐步开发,产量又有所回升。如何有效地利用新的龄级结构发展生产,是目前发展生产的关键。本文通过对尤 相似文献
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一、近几年来松脂数量、质量逐步下降我厂是五十年代办厂的,松脂产量逐步增长,1983年产量达到高峰,年产松脂近六千吨。在这之前松脂质量较好,也能通过优质优价控制与提高松脂质量。 1983年开始,下放砍伐木材审批权后导致一些松树被砍伐,松脂产量减少了,尤其 相似文献
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为了充分利用松脂,研制松脂残渣制取松香,我厂于1980年2月对残渣制取松香的方法及工艺条件进行了摸索,以120号汽油作溶剂,硫酸脱色经适当水洗即可制取浅色松香,现将试验情况小结如下:松脂残渣来自溶解和澄清两工序,主要由泥沙、树叶、树脂酸、水、松节油等组成。按松脂总回收率90%~92%计,加工一 相似文献
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采用GC和GC-MS-DS联用技术在线跟踪分析了Pd/C催化剂上松脂直接催化歧化反应过程主要化学组成随时间的变化关系,并探讨了松脂催化歧化反应机理. 考察了不同反应条件对歧化反应产物的影响,结果表明,松脂可直接催化歧化反应同时获得歧化松香和对伞花烃,在250℃、催化剂用量0.05%(占松脂的质量)的反应条件下,反应90 min时脱氢枞酸与枞酸含量分别占酸性物含量的79.15%和0,对伞花烃含量占中性油含量的62.52%;松脂中酸性物的反应速度大于中性油,在二者同时进行的氢转移反应中,树脂酸脱氢与萜烯脱氢反应均是主反应;以松脂为原料的歧化反应速度大于松香为原料的歧化反应速度,直接以松脂为原料进行一步催化歧化反应,萜烯不仅作为溶剂降低了反应体系的粘度,促进了液固传质并促进了枞酸芳构化反应的进行,同时树脂酸提供了有机酸的质子源,使松节油中的双环单萜异构并芳构化形成对伞花烃. 本研究为该反应动力学研究和反应条件优化提供了理论依据. 相似文献
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近年来,松脂生产由于各种原因,造成松脂质量急剧下降。表现在松脂氧化结块严重,树皮等杂质显著增多,致使松脂加工工艺中,熔解不完全,过滤受阻,残渣中含脂量高(有时商达60%),澄清工序的中层脂液含脂量在50~65%,含杂量也高。目前采 相似文献
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为了更准确鉴别枫香脂(枫脂)原料的掺杂情况,在不同产地的纯净枫脂中加入淀粉和松脂模拟掺杂枫脂,分析掺杂前后枫脂的理化性质和枫脂精油主要成分含量的变化,以建立一种枫香脂掺杂辨伪多指标分析的检验方法。结果表明:掺入淀粉前,枫脂无碘显色反应,掺入淀粉后,碘显色反应明显;按照不同比例掺入松脂后,酸值、皂化值、紫外吸收峰数和峰值以及高效液相图谱均呈现易于鉴别、变化灵敏的特征值;且枫脂精油α-蒎烯、β-蒎烯和β-石竹烯的含量变化明显。以此方法的一个或几个指标的结合,可更灵敏准确地进行枫香脂原料的掺杂辨伪。 相似文献
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Souheila Abbeddou Christos Petrakis Antonio Pérez-Gálvez Panagiotis Kefalas Dámaso Hornero-Méndez 《Journal of the American Oil Chemists' Society》2013,90(11):1697-1703
Color quality is the economical key factor for oily extracts, also referred to as oleoresins, obtained from carotenogenic fruits and vegetables for application in foodstuffs. However, this organoleptic property is not the only attribute as carotenoids develop some bioactive actions, which provide a beneficial effect on health. It has been suggested that reaching some oxidation level during processing enhances the antioxidant activity of phytochemicals, including carotenoids, so that knowledge of the impact of thermal processing in the redox state and antioxidant activity is significant. During thermal degradation of carotenoids in tomato and paprika oleoresins the coloring content, redox state and antioxidant capacity were evaluated. The lipid profile and tocopherol content were similar in both oily extracts but significant differences were observed on functional properties derived from carotenoid activity. The initial antioxidant capacity was similar for both carotenoid extracts, tomato oleoresin kept higher antioxidant capacity values (DPPH test) than paprika oleoresin, although the degradation rate was significantly higher for lycopene, while carotenoids of paprika oleoresin degraded slowly. Paprika oleoresin showed a higher antioxidant activity (hydrogen peroxide test) than tomato oleoresin. Carotenoid degradation products may participate on radical scavenging reactions but efficiency depends on the radical species and structure of degradation products produced during thermal degradation. 相似文献
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Hervé Jactel Marc Kleinhentz Anne Marpeau-Bezard Frédéric Marion-Poll Pierre Menassieu Christian Burban 《Journal of chemical ecology》1996,22(5):1037-1050
Gas chromatographic analysis of the volatile terpenes of the wood oleoresin of maritime pines showed that the relative proportions of terpenes within the same tree did not vary according to sampling height and date. Pruning and tree vigor did not affect terpene profiles, but oleoresin composition varied widely from tree to tree. The trees attacked byDioryctria sylvestrella contained a significantly higher percentage of limonene, longipinene, and copaene, and a discriminant analysis, using the relative percentage of six terpenes, significantly separated infested and uninfested trees. The olfactory sensitivity of adult moths to a series of 20 volatile chemicals, including maritime pine oleoresin components, was evaluated with the electroantennogram method. Both sexes were sensitive to monoterpenes, oxygenated terpenoid compounds, and oleoresin samples. The use of terpenes as host attractants and biochemical markers for resistance toD. sylvestrella is discussed. 相似文献
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超临界CO2萃取黑胡椒中有效成分的研究 总被引:2,自引:1,他引:1
用超临界CO2萃取技术,首先在低压、低温的条件下选择性萃取黑胡椒精油,进而在高温、高压及极性夹带剂的协同作用下,萃取富含胡椒碱的黑胡椒油树脂。另外,利用分子蒸馏技术纯化超临界CO2萃取的黑胡椒精油,得到适用于日化行业的无色、无辛辣感的挥发油,并通过GC-MS对比分析其香气成分。研究结果表明,超临界CO2萃取黑胡椒精油的较优条件为:萃取压力10MPa、萃取温度35℃、萃取时间1.5h,在该条件下产物得率为3.01%;超临界CO2萃取黑胡椒油树脂的最佳条件为:m(原料)∶m(体积分数95%食用乙醇)=2∶1、萃取压力30MPa、萃取温度50℃、萃取时间4h,在该条件下油树脂得率为7.88%,油树脂中胡椒碱质量分数为65.79%。 相似文献