共查询到19条相似文献,搜索用时 859 毫秒
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选择不同的脱色剂对高色泽邻苯二甲酸丁苄酯进行脱色处理;考察了温度、时间及脱色剂用量对脱色效果的影响。在60℃,用质量分数ω=3.0%的脱色剂A处理色泽为350^#的丁苄酯30min,过滤后滤液色泽为100^#(铂-钴比色)。 相似文献
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为提高合成酯产品的质量和性能,对合成酯先脱酸,再分别采用萃取、蒸馏和吸附3种方法进行脱色处理.实验结果表明,脱酸不仅能脱除合成酯当中的游离脂肪酸,还能脱除部分有色杂质,脱酸后酸值从8.75降到0.40,脱色率为5.9%;萃取脱色和蒸馏脱色均不能有效地去除合成酯当中的色素;活性白土、中性氧化铝、硅藻土、凹凸棒土作为脱色剂对色素的吸附效果均不及活性炭;以活性炭为吸附剂,脱色时间55 min,温度81℃,吸附剂用量为原料质量的6.8%,合成酯脱色率为24.8%;经过脱酸、活性炭吸附脱色处理,合成酯从黄红色变成浅黄色液体,产品质量符合要求. 相似文献
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以炉灰剂脱色对分散红染料废水进行脱色处理研究,结果表明,炉灰脱色剂是分散红染料废水很好的脱色剂,其脱除率可达99.84%。用炉灰脱色剂对分散红染料废水进行脱色处理,以废治废,不但炉灰价廉易得,处理设备简单,操作方便,处理时间短,对分散红废水无需进行pH值的调整。炉灰脱色剂再生后可多次重复利用,大大降低了处理成本,而且脱色效果较许多已知的方法还好。 相似文献
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以双氰胺、甲醛为主要原料,尿素、三聚氰胺为改性剂,合成双氰胺甲醛型改性脱色絮凝剂,并用于酸性红18模拟染料废水脱色絮凝沉降实验。实验采用单因素法研究了物料摩尔配比、反应温度、反应时间对改性脱色剂脱色性能的影响,探讨了与无机混凝剂聚合氯化铝(PAC)复配使用情况。通过红外光谱图发现产物为改性的脱色剂。研究结果表明:改性双氰胺甲醛脱色剂性能优于未改性产品,其最佳反应时间为3h,最佳反应温度为80℃,最佳的物料摩尔比为双氰胺:甲醛:氯化铵:尿素:三聚氰胺=1:3.5:0.75:0.13:0.03。改性脱色剂的最佳投加量为120mg/L,其脱色率达到94.6%;单独使用PAC时,最佳投加量为60mg/L,脱色率仅为57.6%;改性脱色剂与PAC复配之后,PAC用量不变时,改性脱色剂投加量为80mg/L时,脱色率就达到94.8%,脱色剂与PAC的复配,不仅提升了脱色性能,并可减少有机脱色剂使用量,降低处理成本。 相似文献
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聚乙二醇相转移催化合成邻苯二甲酸丁苄酯研究 总被引:2,自引:0,他引:2
采用不同的相转移催化剂合成了邻苯二甲酸丁苄酯。分子量为800的聚乙二醇作相转移催化剂,NaOH浓度为37% ̄40%时,可获93%以上的产品收率,且操作简单、产品色泽好。 相似文献
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凹凸棒石黏土脱色剂对碳九馏分进行脱色 总被引:1,自引:0,他引:1
以甘肃临泽凹凸棒石黏土为载体,MnO2为活性剂,制备脱色剂对碳九(C9)馏分进行脱色。通过正交实验研究了酸度、焙烧温度、活性组分加入量、脱色剂的用量和脱色时间对C9馏分脱色的影响。结果表明,焙烧温度600 ℃、活化浓度6%、活性组分MnO2含量4%、脱色剂用量8 g、脱色时间在60 min时,能够使C9馏分的脱色率达到78.66%。 相似文献
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通过酸活化海泡石对蓖麻油进行脱色,研究了干燥温度、干燥时间、脱色温度、脱色时间及脱色剂用量等因素对海泡石吸附脱色性能的影响,确定了最佳活化条件及吸附工艺。该研究表明酸活化海泡石对蓖麻油的脱色效果优于其他传统脱色剂,该研究结论为蓖麻油及其他植物油的脱色剂选择提供一种参考。 相似文献
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Anu Harju 《Journal of chemical ecology》1996,22(4):719-728
The effect of protein and birch bark powder (BBP) content of forage on detoxification capacity of root voles (Microtus oeconomus) was studied. Young voles were fed with eight different diets for two weeks. Individuals on low (3%) protein diets had significantly lighter livers and kidneys than those on moderate (6%) or high (12%) protein diets. Birch bark powder addition did not have significant effect on organ weight. Detoxification was significantly induced, apparently due to secondary compounds in BBP. The activity of ethoxyresorufin-O-dealkylase (EROD) was high when protein content or BBP concentration in forage was high as compared to low protein diets or diets containing no BBP. Glucuronidation, on the other hand, was not induced by BBP. High BBP content caused serious physiological stress to the voles. The only individuals surviving were those capable of sufficiently allocating energy and protein to detoxification. 相似文献
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Anu Harju 《Journal of chemical ecology》1996,22(4):709-717
The effect of protein and birch bark powder (BBP) content of forage on food consumption and growth of root voles (Microtus oeconomus) was studied by feeding young voles with eight different diets for two weeks. Voles ate more when the protein content of forage was moderate (6%) or low (3%), and when BBP was added to the diets, as compared to a high (12%) protein diet without BBP addition. On high and moderate protein diets voles gained weight, whereas on low protein diets they lost weight. Addition of BBP caused reduced growth or weight loss. Consuming a diet with moderate (6%) protein and high BBP (20%) resulted in high mortality (9 of 10 died). These results show that root voles need at least 6% protein for growth and that the effect of birch bark depends on the protein content of the forage. 相似文献
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相转移催化法合成邻苯二甲酸丁苄酯 总被引:1,自引:0,他引:1
以邻苯二甲酸酐、丁醇和氯化苄为原料,用相转移催化法合成邻苯二甲酸丁苄酯,探讨出适合于工业化生产的最佳反应条件。该工艺简单,产率高。 相似文献
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涂料经溶剂提取或涂膜经索氏提取后,提出液中邻苯二甲酸酯类单体DEHP、DBP、BBP、DNOP可用DB-130.0m×φ0.25mm×0.5μm色谱柱同时分离,GC-FID或GC-MSD全扫描测定,DINP、DIDP宜采用GC-MSD选择离子扫描单独测定。采用GC-MSD测定时,方法的回收率不低于95%,DEHP、DBP、BBP、DNOP的最小检出限(LODs)均为0.04μg/mL,最低定量限(LOQ)均为0.35μg/mL。选择扫描时,DINP、DIDP的LODs、LOQ分别为0.4μg/mL、3.5μg/mL。实验结果表明:某些丙烯酸树脂涂料以及手机外壳涂层含有高含量生殖致癌物PAEs类单体,应为制定手机涂料中邻苯二甲酸酯类有害物质最高允许限量进行评价。 相似文献
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Three component photoinitiators mixtures comprised of benzophenone (BP), 4-benzoylbiphenyl (BBP), or isopropylthioxanthone (ITX) with a tertiary amine and an electron deficient anhydride ene result in rapid photoinitiation rates of acrylate polymerization. Concentrations of less than 0.1 weight percent 2,3-dimethylmaleic anhydride (DMMA) added to 1,6-hexanedioldiacrylate (HDDA) containing any of the aforementioned diarylketones and N-methyl-N,N-diethanolamine (MDEA) results in an increase in the polymerization rate maximum by a factor of as much as three times that attained for samples with only MDEA and BP, BBP, or ITX. Laser flash photolysis results confirm that BP, BBP, and ITX are readily quenched by MDEA and DMMA. An initiation mechanism is proposed. 相似文献
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新型高效絮凝脱色剂DF的合成和印染废水的处理 总被引:5,自引:0,他引:5
以甲醛、氯化铵、双氰胺、尿素、硫脲等为原料合成了一种新型的絮凝脱色剂DF ,将该絮凝脱色剂与其它试剂复合使用对印染废水进行了处理。实验结果表明 ,DF对阴离子型印染废水具有很好的脱色效果 ,色度的一次去除率可达 6 0 %以上 ,对COD值的去除率也能达到 6 0 %。 相似文献