共查询到20条相似文献,搜索用时 234 毫秒
1.
使用混合价态的氧化镁/蛋白质/钯催化剂对蓖麻油的常压催化氢化具有使用寿命长(连续使用30次仍有较高的活性)、活性高(氢化速度为510ml/mml.min)氢化彻底(氢化麻油的碘值小于4)等优点,在70℃用下丙醇作溶剂且与蓖麻油投料比为5.77ml/g时氢化活性最高。 相似文献
2.
采用共沉淀法制备了一系列负载型镍铜双金属催化剂,并将其应用于蓖麻油加氢反应。考察了不同金属摩尔比、催化剂制备条件、反应温度、反应压力对蓖麻油氢化反应的影响。结果表明,在以SD-Ⅱ膨润土为载体,金属硝酸盐为反应物,镍铜摩尔比为2.5:1的条件下,制备的催化剂活性和选择性最佳。同时,在H2压力为2 MPa,反应温度为160℃条件下,反应1 h后产品氢化蓖麻油的碘值可以达到3.5 g/100 g左右、羟值达到158.9 mg/g左右,均达到国家标准的指标参数要求。该催化剂在循环使用5次后,仍未发现明显失活。实验结果表明,这种低成本、性能稳定的双金属催化剂可用于氢化蓖麻油工业化生产及连续工艺的开发。 相似文献
3.
油脂选择性氢化催化剂及氢化工艺条件的研究 总被引:3,自引:0,他引:3
本文通过对金属镍催化剂的配方研究,筛选出一个活性和选择性均较优的氢化催化剂。用制得的催化剂对氢化工艺条件进行研究,建立了该催化剂使用条件下氢化选择性指数(St)与氢化温度(T)、氢气压力(P)及催化剂浓度(C)之间的函数关系方程。结果表明, 通过配方提高镍基催化剂的选择性必将降低其活性; 而调节氢化工艺条件则可同时改善催化剂的活性和选择性。 相似文献
4.
我厂是 1 985年建厂 ,1 988年投入生产 ,是以蓖麻籽为原料生产科技含量和附加值较高的蓖麻油精加工系列产品。主要生产线 NO.1蓖麻油、脱水蓖麻油、氢化蓖麻油从德国引进具有 90年代先进水平与国内生产线配套。生产的 NO.1蓖麻油、脱水蓖麻油、氢化蓖麻油、1 2 -羟基硬酯酸等蓖麻油系列产品技术为国内专有生产技术 ,其技术含量达到国内领先水平。近年来 ,在加大对蓖麻油系列产品向名优特方向开发生产的同时 ,利用先进独特的设备优势开发生产劣质动物油精炼加氢技术 ,应用到劣质动物油精炼加氢生产硬化油 ,该项新技术的推广应用对通辽市乃… 相似文献
5.
6.
化学修饰电极—石墨炉原子吸收光谱法联用测定水体及其悬浮物中铬(… 总被引:3,自引:0,他引:3
本文以Nafion化学修饰电极,聚乙烯吡啶(PVP)化学修饰电极分别在pH4.0的溶液中预富集Cr(Ⅲ),Cr(Ⅵ),以石墨炉原子吸收法测定,Cr(Ⅲ)测定的线性范围为5~40ng/ml,检出限为2.5ng/ml。十次平行测定含10ng/mlCr(Ⅲ)的溶液,相对标准偏差为5.0%,Cr(Ⅵ)在pH4的盐酸介质中,测定的线性范围为1~25ng/ml检出限为0.4ng/ml,十次平行测定含10displa 相似文献
7.
本文采用气相色谱法测定生产现场和设备拆卸检修过程中泄漏到空气中的乙炔、氟乙烯。该方法灵敏度为810mV·ml/ml(乙炔)和1400mV·ml/ml(氟乙烯);乙炔、氟乙烯分析的标准偏差为0.0048和0.0015。 相似文献
8.
9.
催化加氢制备氢化蓖麻油的研究 总被引:3,自引:0,他引:3
通过正交试验筛选出适合蓖麻油加氢的催化剂及相应的工艺条件。与传统的加氢反应相比,该催化剂的反应条件温和,加氢反应的活性和选择性高。该催化剂是铜镍二元催化剂,采用硅藻土为载体。适宜的铜镍摩尔比为5:l,载体量为40%,催化剂用量为0.8%,在0.8MPa、150℃下反应4h~6h,所得氢化蓖麻油的羟价155.6mg/g,碘价3.05mg/g。催化剂的重复试验和回用试验证明了开发的催化剂具有实际应用价值。粗产品经4%~5%活性炭处理后,色泽(Klette)≤3。 相似文献
10.
有几种弹性体可选用于耐油应用场合。最常用的耐油性弹性体是丁腈橡胶(NBR)、氯丁橡胶(CR)和丁腈橡胶/聚氯乙烯共混体(NBR/PVC)。其他弹性体,如氢化丁腈橡胶(HNBR)、氯磺化聚乙烯(CSM)、氯化聚乙烯(CM)、各种丙烯酸酯弹性体、硅橡胶、氟硅和氟弹性体,则用于要求较高使用温度的环境中。各种弹性体的相对耐热和耐油性示于常用的ASTMD2000/SAEJ200图中(图1)。 相似文献
11.
The hydrogenation of castor oil was investigated using a catalytic transfer hydrogenation system in which palladium on carbon
was the catalyst and limonene was the solvent and hydrogen donor. The highest percentage of castor oil modification occurred
at 178°C using 1% Pd/C and an oil/limonene ratio of 1∶3. The optimized system presented very good reproducibility and 100%
conversion of the ricinoleate. GC using a mass spectrometer as detector and 1H NMR spectra of the products indicated that hydrogenation was accompanied by dehydrogenation leading to a mixture of 12-hydroxy
and 12-keto stearic derivatives. 相似文献
12.
以可再生的蓖麻油为主要原料,首次采用甲醇钠和三乙醇胺为混合催化剂,与甘油在N2环境中发生酯交换反应,生成蓖麻油单甘脂和蓖麻油甘二酯。考察了催化剂用量、甘油用量、反应温度、反应时间对蓖麻油单甘脂转化率、蓖麻油甘二酯转化率和总转化率的影响,并与传统的催化剂甲醇钠、钛酸四丁酯催化酯交换反应进行了比较。采用FT-IR、GPC对产物的结构、相对分子质量和转化率进行了表征。通过单一变量控制法对反应的条件进行优化。结果表明,催化剂用量为蓖麻油质量的0.75%、蓖麻油和甘油的质量比为50:12.33、反应温度为180℃、反应时间为2.5h时,蓖麻油多元醇的转化率最高,可达92.54%,与传统催化剂相比较,混合催化剂不仅提高了产物的转化率和羟值,而且使产品的色泽降低。 相似文献
13.
14.
体相催化剂经水热处理后,催化剂孔结构发生了改变,孔容、孔径和比表面积增加。采用小型加氢装置加工处理不同超深度脱硫难度的柴油原料,对水热处理后的催化剂进行超深度加氢脱硫活性评价。评价结果表明,体相催化剂经水热处理后,提高体相催化剂的超深度加氢脱硫活性和芳烃饱和性能,加工处理超深度脱硫难度大的劣质柴油时,加氢活性提高更加明显。以直馏柴油为原料,在相同工艺条件下,精制油中硫含量小于10μg/g时,对比没经水热处理的催化剂,水热处理后催化剂的反应温度降低了5℃。而以催化柴油为原料,在相同工艺条件下,精制油中硫含量小于10μg/g时,水热处理后催化剂的反应温度比水热处理前的反应温度降低了13℃。水热处理后的体相催化剂具有良好的活性稳定性。 相似文献
15.
Castor oil was hydrogenated to evaluate the effect of agitation during hydrogenation. The turbine and propeller impellers
were evaluated during hydrogenation of castor oil at various temperatures, pressures, and catalyst concentrations. The effect
of impeller position in the agitator at definite oil depth was also evaluated. Hydrogenation of castor oil at 130°C, 2.0 kg/cm2 hydrogen gas pressure with 0.5% Ni catalyst for 6 h while using two turbine impellers fitted in an agitator, one close to
the reactor bottom and another at a height just below the top oil layer, revolving at 350 rpm, resulted in a product of a
iodine value of 4.1, hydroxyl value of 156.4, and slip point of 84°C. 相似文献
16.
17.
B. Sreenivasan N. R. Kamath J. G. Kane 《Journal of the American Oil Chemists' Society》1957,34(6):302-307
- Products of low iodine value (<10.0) and hydroxyl value (35–40) can be readily obtained by hydrogenating castor oil at atmospheric pressure and at temperatures of the order of 220°, using 1.0% Raney nickel.
- Dehydration of ricinoleic acid and subsequent hydrogenation of the resulting double bond as also simple saturation of ricinoleic acid are the main reactions occurring during the hydrogenation of castor oil under ordinary conditions.
- Increase in the amount of catalyst favors more the hydrogenation of double bond at lower temperatures and both dehydration and hydrogenation at about 220°, which seems to be the optimum temperature for the maximum conversion of ricinoleic acid into nonhydroxy acids with both Raney and dryreduced nickel at atmospheric pressures.
- Higher proportions of catalyst, addition of catalyst stepwise, and higher temperature of hydrogenation cause considerable splitting and estolide formation.
- When hydrogenation is carried out at room temperature, under a pressure of 40 p.s.i. with alcohol as solvent, a product rich in monohydroxy stearic acid is obtained.
- True unsaturation of hydrogenated castor oil is measured by the Wijs method at 15–20°C.
18.
19.
采用沉淀法制备了镍/氧化铝催化剂前驱体,前驱体经焙烧、还原、包油成型制得镍/氧化铝油脂加氢催化剂。通过对催化剂进行TPR、氮吸附测定以及棕榈油加氢评价实验,考察了还原条件(还原温度、还原时间和氢气流速等)对催化剂孔结构和加氢活性的影响。结果表明,还原温度对催化剂孔结构和加氢活性影响最明显;催化剂前驱体最适宜的还原条件为还原温度500 ℃、还原时间3.0 h、氢气流速150 mL/min。在此条件下制备的催化剂用于棕榈油加氢反应,能够使每100 g棕榈油碘值由56.0 g降到0.81 g。 相似文献
20.
Ethanolysis of castor and cottonseed oil: A systematic study using classical catalysts 总被引:1,自引:1,他引:1
Simoni M. Plentz Meneghetti Mario R. Meneghetti Carlos R. Wolf Eid C. Silva Gilvan E. S. Lima Masurquede de A. Coimbra João Inácio Soletti Sandra H. V. Carvalho 《Journal of the American Oil Chemists' Society》2006,83(9):819-822
Several classical catalytic systems for the transesterification reaction have been used to produce FA ethyl esters (FAEE)
from castor and cottonseed oils The effects of the amount and nature of the catalyst, and of the reaction temperature, on
the yields of FAEE were determined. The most efficient transesterification of castor oil was achieved in the presence of methoxide
and acid catalysts, whereas for cottonseed oil, which has a composition that is much more similar to most vegetable oils than
is castor oil, the highest yields of FAEE were obtained following base-catalysed ethanolysis. 相似文献