共查询到19条相似文献,搜索用时 234 毫秒
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我公司精苯装置的轻苯加工能力为3.0万t/a,吹苯残渣产量为50~60t/月,其中含苯约5%,含水40%。该残渣在立式槽内用蒸汽脱水后外卖,但蒸煮过程中产生的含苯蒸汽直接排入大气,不仅污染了环境,而且损失了苯类等有用物质。为尽可能地回收苯渣中的苯类物质和保护环境卫生,我们对蒸煮吹苯残渣的立式槽进行了改进,即在槽顶增设了F=15m2的螺旋板换热器。为确保生产安全,在槽顶设置了放散管和压力表,见图1。另外,为进一步改善精苯工序的操作环境,加强了对吹苯塔和塔底加热器的管理。针对吹苯塔胴体纵向焊缝腐蚀严重的问题,采用了坡角70°的Y型焊缝,提… 相似文献
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石家庄焦化集团有限责任公司苯精制装置的副产品苯残渣中含许多组分,严重影响产品收率,将苯残渣直接送入煤气净化粗苯系统直接加工,有较好的经济效益。 相似文献
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苯氨基甲酸甲酯精馏残渣的紫外分光光度分析 总被引:2,自引:0,他引:2
对非光气法合成苯氨基甲酸甲酯精馏残渣中各组分,采用双波长紫外分光光度法进行了含量分析试验。试验结果表明:N,N′-二苯基脲的吸光度和质量浓度一元线性回归方程为ADPU=0.3949ρDPU-0.001031,相关系数R^2=0.9999;苯氨基甲酸甲酯和N,N′-二苯基脲的回收率分别为96.1%-102.3%和96.8%。101.0%,相对标准偏差小于0.4%;将该法所测定结果与高效液相色谱所测定结果比较,其相对偏差小于2%。采用双波长紫外分光光度法测定MPC和DPU的含量具有准确、快速、简便等特点。 相似文献
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我厂苯加氢装置的副产品重苯残油的平均产率约为3%,每年产量在1800t左右,处理方法是作燃料油外卖或进行简单蒸馏回收少量三种苯,重苯残油的组成见表1。从表中可看出,重苯残油中三种苯的含量并不低,为此,我们将重苯残油兑入粗苯富油中,收到了增产苯类产品的好效果 相似文献
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1996年月1月,日本钢管公司福山钢铁厂焦炉煤气净化车间划规给阿德凯姆科公司笠冈工厂管理后, 该厂对焦油蒸馏和粗苯回收装置重新确立了生产管理体制。为增加粗苯产量, 改进了粗苯回收系统的生产条件, 现介绍如下。1 粗苯回收设备的概要笠冈工厂煤气净化流程示于图1。在与3、4号焦炉配套的一回收车间, 荒煤气经过鼓冷、脱硫、脱氨、粗苯回收工序后变为净煤气。与5号焦炉配套的二回收车间其流程与一回收车间相同, 但二回收车间的部分净煤气送至相距约2km的一回收车间的脱硫工序处理。粗苯回收工序的流程示于图2, 主要设备规格示于表1。吸收系… 相似文献
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合成含氟表面活性剂 OBS 中间体全氟壬氧基苯时,苯为溶剂,三乙胺为缚酸剂。在分离提纯全氟壬氧基苯的过程中,其前馏份中除了有未反应的全氟丙烯齐聚物外,主要是苯和三乙胺。苯、三乙胺可以回收,重新用于合成反应。为了准确计算反应物投料量,要求测出苯和三乙胺混合溶剂中三乙胺的含量。由于胺类化合物一般具有较大的极性,表现在它们的色谱流出曲线往往不对称,色谱峰严重拖尾,而且响应值也较低。要使其 相似文献
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包钢焦化厂二回收车间的粗苯工段,采用管式炉加热的一塔式两种苯生产工艺。自1997年9月投产以来,由于包头地区的气温较冷,轻苯冷凝冷却后的温度在30-35℃。在夏季,由于轻苯冷凝冷却器进出口的冷却水温差仅为1-2℃,致使冷却器后的轻苯温度仍高达45℃,因轻苯挥发损失过大,严重影响了轻苯的回收率。为此,我们对轻苯冷凝冷却器进行了改造,取得了理想的效果。 相似文献
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以取代苯胺为原料,经甲酰化、胺解合成了二个二苯基脲衍生物,利用元素分析、红外光谱对目标化合物进行了结构表征,并讨论了反应温度、反应时间对收率的影响。 相似文献
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Kinetics and Mechanism of the Reaction of Aryl Isocyanates with Alkyl Hydroperoxides Sec-alkyl peroxycarbamates, prepared from phenyl isocyanate and sec-alkyl hydroperoxides, are instable at normal temperatures and decompose to yield ketones, carbon dioxide and aniline which reacts further to diphenylurea. The reactions of phenyl isocyanate with tetraline hydroperoxide, t-butyl hydroperoxide, aniline, and tert.-butanol in dioxane have been studied kinetically and the catalytic constants of diazabicyclooctane, triethylamine, and stannous octoate as catalysts have been determined. Rate constants of the reactions with hydroperoxides decrease with increasing hydroperoxide concentration caused by association of the catalyst with the hydroperoxide. Compared to their basicities, alkyl hydroperoxides are very reactive towards isocyanates. 相似文献
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Synthetic methodologies have been developed which yield a variety of diphenylamine (DPA) and 1,3‐diethyl‐l,3‐diphenylurea (ethylcentralite or EC) propellant stabiliser degradation derivatives in high yield. The N‐alkyl nitroanilines (N‐methyl‐2,4,6‐trinitroaniline; N‐methyl‐2,4‐dinitroaniline; N‐ethyl‐2,4,6‐trinitroaniline; N‐ethyl‐2,4‐dinitroaniline; N‐ethyl‐4‐nitroaniline; N‐ethyl‐2‐nitroaniline) have been obtained either by reaction of the parent aniline with the required alkyl halide under mild conditions or via Ullmann type chemistry. A robust and high yielding approach for the synthesis of di, tri and tetranitrodiphenylamines (2,2′,4,4′‐tetranitrodiphenylamine; 2,4,4′‐trinitrodiphenylamine; 2,2′,4‐trinitrodiphenylamine; 2,4,6‐trinitrodiphenyl‐amine; 2,4‐dinitrodiphenylamine) is reported which involves passing the nitroanilines and chloronitrobenzenes down a base activated alumina column. The N‐nitroso‐N‐alkyl compounds (N‐nitroso‐N‐ethyl‐4‐nitroaniline; N‐nitroso‐N‐ethyl‐2‐nitroaniline; N‐nitroso‐N‐Methyl‐4‐nitroaniline; N‐ethyl‐N‐nitrosoaniline; N‐nitroso‐2‐nitrodiphenylamine) have been synthesised using nitrosyl acetate in acetic acid as the N‐nitrosating agent. 相似文献
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V. T. Srinivasan B. B. Singh P. K. Chidambareswaran V. Sundaram 《Journal of the American Oil Chemists' Society》1986,63(8):1059-1062
In the nondestructive estimation of seed oil by pulsed nuclear magnetic resonance (NMR), an assumption generally is made that the hydrogen content of the oil in the seed sample under investigation is the same as that of the oil standard or that of the oil in the standard seed samples. The hydrogen content is defined as the number of hydrogen atoms per unit mass of oil. The validity of this assumption has been investigated by; (i) calculating the Hydrogen contents of various oils on the basis, of their reported fatty acid composition, and (ii) experimentally determining the hydrogen contents of cotton and mustard oils obtained from different varieties of seeds. The FID method was used to monitor the NMR signal intensities. Both calculated and experimental values show that that hydrogen contents can be different not only for different oils but also for the same oil extracted from different varieties of the seeds. This variation in hydrogen contents is shown to introduce an error in the oil content values as estimated by NMR methods. The magnitude of this error increases with oil content, and also with the difference in the hydrogen contents. 相似文献