共查询到10条相似文献，搜索用时 125 毫秒
1.
杂多酸催化合成醋酸丁酯的研究 总被引：2，自引：1，他引：2
本文研究了以磷钼杂多酸为催化剂，以无水氯化钙为吸水剂催化合成醋酸丁酯，并探讨了酸反应条件。结果表明，磷钼杂多酸具有较高的催化活性和选择性，在最佳条件下，酯产率可达９６％，产品质量符合国标要求，该方法操作简便，条件容易控制，无污染。 相似文献
2.
研究了以复合型固体超强酸为催化剂率合成醋酸正丁酯,探讨了酯化反应条件和催化剂的制作工艺对酯产生率的影响,实验结果表明,复合型固体超强酸（ＳＯ＾２－４／ＺｒＯ２－Ａｌ２Ｏ３）具有较高的催化活性和选择性,在最佳工艺条件下醌产率可达９６％,产品质量符合国标要求,该工艺操作简便,条件易控制,对环境无污染。 相似文献
3.
以CTMAB为相转移催化剂，苯酐、正丁醇和苄氨为原料合成BBP的新方法。通过设计正交实验，对原料配比、反应时间、催化荆用量、pH值和加水量等影响因素以及催化荆的回收利用进行了研究。实验结果表明，苯酐：正丁醇：CT．MAB：苄氨为1：1．33：0．04：1．2，pH值为9，反应时间为3h，反应过程中的加水量为1％时最高酯产率可达到80％以上。本方法操作简单，耗时少，成本低，催化荆可回收利用，产品质量好，无“三废”污染，并易于工业化生产。 相似文献
4.
固体超强酸催化合成乙酰柠檬酸三丁酯 总被引：5，自引：0，他引：5
以柠檬酸、正乙醇、乙酸酐为原料,固体超强酸为催化剂,经酯化、酰化反应,我毒增塑剂乙酰柠檬酸三丁酯。考察了影响产率的多种因素,确定了最佳反应条件。 相似文献
5.
对甲苯磺酸催化合成乙酸异戊酯的研究 总被引：8，自引：0，他引：8
研究了以对甲苯磺酸为催化剂、以无水氯化钙为吸水剂,催化合成乙酸异戊酯的新方法,探讨了酯化反应的条件。结果表明,对甲苯磺酸具有较高的催化活性,在最佳条件下,酯产率可达９４％以上,产品质量符合要求。本方法操作简便、反应时间短、反应条件易控制、无污染。 相似文献
6.
R. Mirsafaei S. Delzendeh A. Abdolazimi 《International Journal of Environmental Science and Technology》2016,13(9):2219-2226
A novel nanocatalyst silica-bonded sulfuric acid supported on KIT-5 as an organic–inorganic hybrid with high activity was prepared successfully. The KIT-5 with high surface area was reacted with chlorosulfonic acid via simple and rapid method. This efficient and reusable heterogeneous catalyst sulfuric acid nanocatalyst catalyzed one-pot synthesis of β-dicarbonyl compounds, aldehyde and ammonium acetate in the presence of 0.05 g of nanocatalyst at room temperature via solvent-free conditions to afford excellent yields of 1,4-dihydropyridines. This nanocatalyst was fully characterized by XRD, SEM–EDXS and Map analyses. The morphology of the catalyst surface by SEM images shows all porous of KIT-5 after the reaction was filled with the SO3H groups. The average size determines around 22–24 nm. This catalyst can be reused five times without any significant loss of activity, too. The ease of separation, high activity, high surface area and reaction under open air condition are the main advantages of this catalyst. 相似文献
7.
烃源岩生烃动力学广泛应用于含油气盆地烃源岩评价与勘探中。为模拟低成熟烃源岩的实际沉积环境,实验选取了抽提有机质后的东营凹陷下第三系沙河街组三、四段烃源岩为矿物催化剂,以十八烷酸甲酯为模型化合物,在高压下做矿物低温催化脂肪酸酯脱羧生烃动力学实验。求取了化学反应的动力学参数,并分析了烃源岩层段的pH值与Eh值。结果表明,矿物对脂肪酸酯的脱羧生烃具有明显的催化作用,用连串反应模型处理脂肪酸酯的水解反应基本上为一级反应,而生烃反应则基本上为零级反应。认为对于同一类型的烃源岩,其所处的氧化还原环境对有机质的生烃有较大的影响;而对于不同的烃源岩,矿物的组成则起着非常重要的作用。 相似文献
8.
以可控自由基聚合技术制备的磁性高分子复合微球P（GMA—MMA．AA）／Fe3O4为载体,三乙烯四胺为配体制备了一种新型的负载型钯催化剂。采用透射电镜、振动样品磁强计、x射线光电子能谱仪和x射线衍射分析仪等手段对催化剂进行了表征,并评价了催化剂对水相Suzuki反应的催化活性。结果表明,催化剂的平均粒径为800nm左右,钯在载体表面呈高度分散状态,整个催化剂呈超顺磁性。该催化剂在空气氛围中就能较好的催化水相中芳基卤代物与苯硼酸的Suzuki反应,较高产率且立体选择性地生成取代的联苯产物,反应过程中催化剂可稳定分散于反应体系中,并可在外磁场作用下快速与从体系分离。催化剂重复使用5次后,仍具有较高的活性。 相似文献
9.
N. Mlaik M. Khcharem M. Kouas S. Sayadi S. Khoufi 《International Journal of Environmental Science and Technology》2018,15(9):1913-1920
The effect of particle size of the organic fraction of municipal solid waste on methane potentiel was investigated and tested at different substrate-to-inoculum ratios (0.1, 0.5 and 1.0). The highest methane yield was obtained with particle size fraction > 3 mm at S/I of 0.1. Thermo-alkali and thermo-acid methods were also tested as pretreatment to increase the organic matter solubilization and subsequently methane production. The results indicated that maximum variation (63.6%) of soluble chemical oxygen demand was obtained by thermo-acid method. Optimum conditions of thermo-alkali pretreatment were pH 10, time reaction of 30 min and temperature of 105 °C. Soluble chemical oxygen demand and reducing sugar variations reached, respectively, 40 and 69% under these conditions. The methane yield of untreated and thermochemical pretreated OFMSW was determined in batch condition. The highest methane yield (260.9 L/kg VS) was obtained with thermo-alkali pretreatment, which was 21% higher than that of raw substrate. This study may pave a new way for industrial application of dealing with the organic fraction of municipal solid waste. 相似文献
10.
G. Moradi F. Mohammadi 《International Journal of Environmental Science and Technology》2014,11(3):805-812
In the present study, the waste coral was utilized as a source of calcium oxide for transesterification of soybean oil into biodiesel (methyl esters). Characterization results revealed that the main component of the waste coral is calcium carbonate which transformed into calcium oxide when calcined above 700 °C. The Box–Behnken design of experiment was carried out, and the results were analyzed using response surface methodology. Calcination temperature, methanol– soybean oil molar ratio and catalyst concentration were chosen as variables. The methyl ester content (wt%) was response which must be maximized. A second-order model was obtained to predict methyl ester content as a function of these variables. Each variable was placed in the three low, medium and high levels (calcination temperature of 700, 800 and 900 °C; catalyst concentration of 3, 6 and 9 wt%; methanol-to-oil ratios of 12:1, 18:1 and 24:1). The optimum conditions from the experiment were found that the calcination temperature of 900 °C, catalyst concentration of 6 wt% and methanol-to-oil ratio of 12:1. Under these conditions, methyl ester content reached to 100 wt%. The waste catalyst was capable of being reused up to 4 times without much loss in the activity. 相似文献