共查询到20条相似文献,搜索用时 0 毫秒
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异喹啉为无色片状结晶,有吸水性,碱性较喹啉强,能与多种溶剂混合,可溶于稀酸,在有机合成工业中,可作为制造医药、农药和气相色谱固定液等的原料。1原料的预处理生产异喹啉的原料是喹啉残液,即浮选剂II。喹啉残液中的异喹啉含量约为30%,为此,首先应利用喹啉工段的减压蒸馏装置将喹啉残液进行减压蒸馏,制成异喹啉含量>50%的异喹啉原料,其组成见表1。2异喹啉的生产工艺从表1可看出,异喹啉原料中各组分的沸点差较大,故可用蒸馏法制取异喹啉。由于异喹啉原料是分批生产的,故采用间歇精馏较为适宜,年产10t异喹啉的生… 相似文献
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Benzoic acid residue is solid waste produced from the production of benzoic acid by oxidizing toluene. Because it contained important chemical raw materials such as benzoic acid, benzyl benzoate and fluorenone, it is necessary to recover them from the residue. In this work the technique featured with high efficiency evaporation and vacuum distillation was developed to obtain total recovery and utilization of the benzoic acid residue. By controlling the operation temperature at 260°C and the pressure of 16 kPa in the rising and falling film evaporators, heavy components separated efficiently from the residue can be polymerized and the light components consisting of 63% of the residue entered into a benzoic acid vacuum distillation column. Keeping the temperature of polymerization at (280±10)°C, coumarone resin was produced after adjusting the softening point according to the market re-quirements. Vacuum distillation was operated under the following conditions: top temperature at 186°C, top pres-sure of 16 kPa, bottom temperature at 240-250°C, reflux ratio being 3︰1. Benzoic acid of 98% purity was distilled out from the column as a side stream and the bottom product was crude benzyl benzoate. By the developed tech-nique, the benzoic acid residue was splitted into three products, benzoic acid, crude benzyl benzoate and coumarone resin without any surplus waste. 相似文献
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从苯塔残液中提取联苯的研究 总被引:3,自引:1,他引:3
利用精馏和溶剂重结晶相结合的方法,从苯加氢装置的苯塔残液中提取联苯,精馏后可获得95%以上的联苯窄馏分,进一步重结晶后可获得99.5%以上联苯。 相似文献
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用苹取精馏法从分步结晶萘残液中提取萘。选择有机硫化物(简称溶剂A),在0.013兆帕压力下使用28块理论板的精馏塔,研究了不同回流比和不同溶剂比对塔顶产物中萘含量和萘回收率的影响。本研究还回归了在溶剂存在下萘与硫茚的相对挥发度关系式。 相似文献
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蚕丝中除丝素外,还含丝胶达20~30%。丝胶是一种蛋白质,等电点在pH=3.9~4.3之间,具有缓行的性能,其水溶液的吸附性和乳化性有实际应用的价值。例如,在照相工业上用作乳化剂,在染丝工业上用作染料的吸附匀染剂。目前一般丝厂和绸厂,在提练与精制生丝时,脱下的丝胶形成废水残液,均被弃去,从未利用。丝厂煮茧废水中丝胶含量甚微,最大含量仅达118.4p.p.m.。曾用各种方法提取,均未成功;但绸厂中生丝,由於与肥皂作用,脱胶程度较深,所以绸厂残液含有较多的丝胶。因此,从绸厂残液提取丝胶,是值得研究的问题。但怎样分离丝胶,文献中尚少记载,本文仅为初步研究报告。 相似文献
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以邻硝基甲苯为原料在乙醇钠催化下与草酸二乙酯缩合、水解、双氧水氧化、盐酸酸化得到邻硝基苯乙酸收率为62%。在水溶液中,以FeO(OH)为催化剂,水合肼还原邻硝基苯乙酸得到氧化吲哚。考察了还原过程中影响反应的因素。结果表明,水合肼∶邻硝基苯乙酸=3∶1(摩尔比),催化剂FeO(OH)的用量为0.2 g/mmol邻硝基苯乙酸,溶剂水的用量为5 mL/mmol邻硝基苯乙酸,回流反应1.0 h,氧化吲哚的收率为95%。两步总收率达59%。 相似文献
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煤焦油中的含氮和含硫芳烃化合物是重要的工业原料,可用各种方法进行回收,而未回收化合物燃烧产生的SOX和NOX污染环境。随着近些年炼 相似文献
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