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以衣康酸和异戊醇为原料,浓硫酸为催化剂,环己烷为带水剂,通过酯化反应合成了生物基弹性体中间体衣康酸二异戊酯。通过酯化率测定研究了醇、酸物质的量比,催化剂用量,反应温度及反应时间等对合成的影响。结果表明,最佳合成反应条件为:n(衣康酸)∶n(异戊醇)=1∶4,催化剂用量为衣康酸质量的1.54%,120℃下反应3 h后产物由红外光谱仪和核共振波谱仪分析证明生成了较纯净的衣康酸二异戊酯,产率在98%以上。 相似文献
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杂多酸催化合成戊二酸二异辛酯的研究 总被引:5,自引:0,他引:5
以从二羧酸中分离出的戊二酸和异辛醇为原料,在钨磷杂多酸催化作用下酯化合成了戊二酸二异辛酯。考察了醇酸摩尔比,反应温度,反应时间,催化剂用量等因素对酯化反应的影响,确定了合成戊二酸二异辛酯的工艺条件,醇酸摩尔比2.5:1,反应温度140℃、反应时间2h、催化剂用量为体系总质量的0.2%,在此条件下,酯化率可达98%以上。 相似文献
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以新型离子液体N-甲基吡咯烷酮硫酸氢盐([Hnmp]HSO4)为催化剂,己二酸和异辛醇为原料,环己烷为带水剂,对己二酸二异辛酯的酯化反应进行了研究,重点考察了醇酸摩尔比、催化剂用量、带水剂加入量、反应时间等因素对己二酸二异辛酯酯化率的影响。实验结果表明,N-甲基吡咯烷酮硫酸氢盐对合成己二酸二异辛酯有着良好的催化活性,当己二酸用量为0.1mol时,醇酸摩尔比为2.6:1,催化剂用量为己二酸物质的量的1.2%,带水剂环己烷为10mL,回流温度下反应时间120min,在此条件下,反应的酯化率可达99%以上,且催化剂重复使用6次仍保持较高活性。 相似文献
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以甲基磺酸钙为催化剂催化异辛醇与油酸的酯化反应合成油酸异辛酯,考察了催化剂用量、反应温度、醇酸配比及反应时间对酯化反应的影响。当催化剂用量为0.5%(以总物质的质量计),反应温度120~130℃,当异辛醇与油酸的量比为1.3∶1,反应时间5h时,酯化率可达99.6%。 相似文献
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通过衣康酸与聚乙二醇的酯化反应,制备出了一种可用于合成聚羧酸系减水剂的大分子单体。用正交实验研究了反应条件对酯化反应的影响,确定了最佳的酯化反应条件为n衣康酸:n聚乙二醇-1000为1:1.1,催化剂用量为聚乙二醇-1000质量的4%,反应温度100 ℃,反应时间6 h,带水剂用量为聚乙二醇-1000质量的30%,阻聚剂用量为衣康酸质量的2%。在该条件下单酯化率可达到98.3%。并通过红外光谱、氢核磁共振谱对大分子单体进行了表征,结果表明得到了衣康酸聚乙二醇酯大单体。 相似文献
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Regioselective dialkylation of naphthalene 总被引:1,自引:0,他引:1
The alkylation of naphthalene using tert-butanol in cyclohexane over a dealuminated H-Mordenite (HM) zeolite has been optimised to give a 60% yield of 2,6-di-tert-butylnaphthalene with a 2,6/2,7 ratio of over 50. This has been achieved by varying the reaction time, temperature, pressure, solvent, amount of tert-butanol, solvent and catalyst, Si/Al ratio of the catalyst, and the mode of addition. 相似文献
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A variety of analytical techniques has been utilized to determine the chemical changes which take place during the thermal conversion of the aromatic hydrocarbons naphthalene (N) and dimethylnaphthalene (DMN), to pitch, mesophase, and coke. Aromatic polymerization was shown to play a dominant role at each stage of the coking process. Secondary reactions involving hydrogen transfer and molecular rearrangement were also apparent. Polymerization of (N) occurs largely through the loss of hydrogen while the polymerization of (DMN) involves the elimination of methyl groups. The faster rate of coking for (DMN) compared to (N) is attributed to the activating effect and facile bond cleavage of the methyl group. 相似文献
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D. Mravec M. Michvocík M. Hronec P. Moreau A. Finiels P. Geneste 《Catalysis Letters》1996,38(3-4):267-270
Cyclohexylation of naphthalene was studied over four commercial unmodified HY zeolites. Approximately equal results were obtained on HY (ZF 515, ZF 520, CBV 720) zeolites. The best results were obtained with cyclohexylbromide as alkylating agent inn-nonane and inn-decane as solvents at boiling point. Conversion of naphthalene was max. 97%, 2,6-selectivity 43% and,'-selectivity 77%. 相似文献
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The dimer, 1,2-di(4-methyl-1-naphthyl)ethane has been studied in metal-ammonia reduction as a model for the analogous polymer which has recently been reported. Both unsubstituted rings were reduced and reduction of only one ring by limiting the metal could not be accomplished. No CC bond cleavage occurred under these conditions. The dimer behaved quite differently from the monomer (1,4-dimethylnaphthalene) with respect to 1,2-dihydro and tetralin-like products. 相似文献
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对萘、2-甲基萘、甲苯和二甲苯等原料制备2,6-二甲基萘的各种工艺进行了综述,并对目前工业化路线的生产成本进行了比较,提出在我国实现工业化生产时应注意的问题。 相似文献