共查询到19条相似文献,搜索用时 60 毫秒
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精苯酐中适量苯酐轻组份的加入,对邻苯二甲酸二辛酯(DOP)产品的APHA色值和体积电阻系数没有影响,但加入量多少会影响DOP的纯度,控制轻组份掺入精苯酐的加入量可使DOP产品质量达到优级品。 相似文献
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1,2,5,6—四氢苯酐的合成研究 总被引:1,自引:0,他引:1
顺丁烯二酸酐与1,3-丁二烯通过Diels-Alder反应制备1,2,5,6-四氢苯酐,产品收率在98%以上,熔点为98-100℃。 相似文献
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Esterification of phthalic anhydride with 2-ethylhexanol by solid superacidic catalysts 总被引:2,自引:0,他引:2
Heterogeneous superacidic solid catalysts have proved to be very effective from the viewpoint of activity, selectivity, reusability and economy in the preparation of various important chemicals which pose a number of difficulties with homogeneous catalysts. This paper delineates efficacy of several solid superacidic catalysts in the preparation of the industrially important plasticizer, dioctyl phthalate (DOP ), from 2-ethylhexanol and phthalic anhydride. This study also throws light on the preparation of super-acidic catalysts, wherein the thermal treatment step is important in order to have good activity for the catalyst. A complete kinetic study with sulphated zirconia is also presented. In case of supported heteropoly acids the support was found to play an important role in defining the final activity of the catalyst. 相似文献
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2005年全球邻苯二甲酸酐(PA)的生产能力约为450万t/a,需求量可达到350万~360万t,用于增塑剂占57%、醇酸树脂占17%、不饱和聚酯树脂占17%。未来5年全球PA需求将以年均3.0%~3.5%的速率增长,其中亚太地区将继续引领全球PA市场快速增长,其年均增速将达到4.0%~4.5%,美国仅以1.5%~2.0%的速率增长,西欧仅以1.0%的速率增长。我国产能和产量快速增长,2004年国内生产能力约为864 kt/a,消费量约为873 kt,用于邻苯二甲酸酯类增塑剂约占总消耗的60%,醇酸树脂约占22%,不饱和聚酯树脂占10%。 相似文献
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介绍了以苯酐、C l2为原料,无水FeC l3做催化剂,制备单氯代苯酐的方法,从苯酐的转化率、单氯代苯酐选择性两方面展开了苯酐氯化制备单氯代的研究,指出最佳的制备条件为:催化剂用量1.5%,C l2与苯酐摩尔比0.8∶1,反应时间11h。 相似文献
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