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1.
使用活性炭对蔗糖热聚合产物进行脱色处理。通过比较等温吸附曲线,确定颗粒状活性炭对蔗糖热聚合产物的脱色效果优于粉末状活性炭。单因素实验和正交实验的分析结果表明,当蔗糖热聚合产物溶液浓度为400g/L时,脱色的最佳条件为活性炭用量质量分数2%,温度为80℃,脱色时间为40min。在此条件下脱色率为97.2%。  相似文献   

2.
目的研究不同活性炭对竹醋原液及精馏液的脱色、脱臭最佳工艺。方法以单因素方法考察活性炭的脱色时间、温度、用量、pH值对竹醋原液和精馏液的脱色脱臭效果的影响。结果活性炭对竹醋原液的最佳脱色、脱臭工艺条件为:脱色时间40min,脱色温度50℃,单位体积竹醋液活性炭用量为14mg/mL;对竹醋精馏液的脱色、脱臭的最佳工艺条件为:脱色时间30min,脱色温度40℃,单位体积竹醋液活性炭用量4mg/mL。结论本试验工艺条件下3种活性炭的脱色脱臭效果为:竹醋原液:硬木活性炭杉木活性炭竹炭;竹醋精馏液:杉木活性炭硬木活性炭竹炭。  相似文献   

3.
本文研究了微生物法提取甘油酸工艺中不同因素(活性炭添加量、脱色温度、脱色时间等)对活性炭脱色效率和甘油酸提取损失率的影响.单因素实验结果表明,活性炭添加量大小、脱色温度高低和脱色时间长短等3种因素对活性炭的脱色率以及甘油酸的提取率均有不同程度的影响.利用正交实验研究3种显著因素之间的相互作用,实验结果表明,当活性炭的用量为5%,甘油酸发酵液的脱色温度最佳值为50℃,脱色时间最佳值为30min时,甘油酸发酵液中活性炭的脱色率最终可以高达90.59%,甘油酸提取损失率可达到11.45%.  相似文献   

4.
沙葱多糖活性炭脱色工艺的研究   总被引:2,自引:0,他引:2  
采用水提法提取沙葱多糖,研究了活性炭添加量、脱色时间和脱色温度对沙葱多糖脱色效果的影响,并在单因素试验的基础上,采用正交试验确定了沙葱多糖活性碳脱色的最优工艺参数。结果表明,活性炭添加量对脱色效果的影响最大,其次为温度,再次为时间。最佳脱色条件为脱色温度80 ℃,活性碳添加量1.0%,吸附时间40 min,在此条件下,脱色率为93.25%,多糖损失率为18.79%。  相似文献   

5.
活性碳纤维处理染料废水脱针对性能的研究   总被引:1,自引:0,他引:1  
分析了活性碳和活性炭纤维的吸附性能,研究了活性炭纤维在处理亲水性染料废水时特殊的脱色效果。实验验证了活性炭纤维和活性炭的吸附等温线的形式。还对活性炭纤维的再生方法和再生机理进行了试验研究,为活性炭纤维用于染料废水脱色处理提供了工程应用前景。  相似文献   

6.
为了研究自制的汉麻活性炭对竹醋原液的脱色脱臭的最佳工艺,以单因素试验考察活性炭的用量、吸附时间、温度对竹醋原液(100℃蒸馏液)脱色脱臭的影响.结果表明:最佳工艺条件为单位体积竹醋原液汉麻活性炭用量24mg/mL,单位体积竹醋蒸馏液汉麻活性炭用量10mg/mL,吸附20min,吸附温度60℃,pH值为3.0,磷酸汉麻活性炭脱色率达85%以上;氯化锌脱色率达60%以上,磷酸汉麻活性炭吸附量高达385.3~427.3mg/g.结论:磷酸汉麻活性炭脱色率比其他活性炭脱色、脱臭率高,可应用于竹醋液的脱色脱臭.  相似文献   

7.
芦笋多糖活性炭法脱色工艺   总被引:1,自引:0,他引:1  
为优化芦笋多糖活性炭法脱色工艺条件,以综合吸附效应指数为考察目标,利用活性炭法进行芦笋多糖脱色,在单因素试验基础上,进行了均匀设计试验。结果表明,芦笋多糖活性炭法脱色的最佳工艺条件为脱色温度80℃,脱色时间60 min,活性炭的质量浓度25 g/L,溶液pH值7.0,该条件下综合吸附效应指数为68.24%,脱色率为67%,脱蛋白率为89%,多糖保留率为56%。  相似文献   

8.
活性炭纤维处理染料废水脱色性能的研究   总被引:5,自引:0,他引:5  
分析了活性炭和活性炭纤维的吸附性能 ,研究了活性炭纤维在处理亲水性染料废水时特殊的脱色效果 .实验验证了活性炭纤维和活性炭的吸附等温线的形式 .还对活性炭纤维的再生方法和再生机理进行了试验研究 ,为活性炭纤维用于染料废水脱色处理提供了工程应用前景  相似文献   

9.
活性炭—H202催化氧化处理氨基C酸工业废水的研究   总被引:11,自引:1,他引:11  
研究了活性炭—H2O2催化氧化处理氨基C酸工业废水的氧化脱色效果,活性炭兼具吸附和催化双重作用.试验结果表明,在pH=1.0,氧化剂的用量为H2O2/废水=50mL/L,催化剂的用量为活性炭/H2O2=0.5—0.75g/mL时,废水的CODcr去除率可达62.4%,脱色率达到94.6%.显示了该法处理氨基C酸工业废水良好的氧化脱色效果.  相似文献   

10.
本文以活性炭为脱色剂,对药物生产过程中间体有色反应液进行脱色,并对活性炭的选择以及影响脱色效果的因素进行了详细的考察,筛选出最佳的工艺条件和吸附等温平衡线。实验表明,粉状炭作为脱色剂具有更大的优越性。  相似文献   

11.
Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women's language from these perspectives: pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women's language, more attention should be paid to language use in social context. What's more, the linguistic phenomena in a speaking community can be understood more thoroughly.  相似文献   

13.
The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3~4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰~ -7.8‰, PDB) and matrix dolomites (-6.6‰~ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084~0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078~0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.  相似文献   

14.
理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。  相似文献   

15.
王慧 《科技信息》2008,(10):240-240
Wuthering Heights, Emily Bronte's only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.  相似文献   

16.
The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.  相似文献   

17.
As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.  相似文献   

18.
There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.  相似文献   

19.
In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.  相似文献   

20.
1 Rise of studies on climate change's effects on biodiversity
Until the 1980s, climate change and biodiversity were studied as two independent disciplines for more than a century. In 1992, the Ecological Society of America's annual report named climate change, biodiversity, and the sustainable ecological system as the three major global environmental issues of the twenty-first century [1].  相似文献   

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