共查询到19条相似文献,搜索用时 234 毫秒
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<正>鲁齐公司、依士曼公司和SK化学公司承建的660 kt/a聚合级对苯二甲酸(E PTA)装置在绍兴投产,由浙江华联三鑫石化集团公司兴建。该E PTA装置具有投资和生产费用较低的特点。 依士曼化学公司开发的E PTA工艺由粗对苯二甲酸(CTA)生产、E PTA生产和催化剂回收3部分组成。对二甲苯在醋酸溶剂中用空气在液相催化氧化。进料混合物(对二甲苯、溶剂和催 相似文献
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由烷基芳烃生产降低色相的芳香羧酸的氧化方法此法可以制得具有良好色泽的芳香羧酸 (例如 :对苯二甲酸 )的粉末产品 ,当它溶解于碱的水溶液中时呈现出良好的透光率。它的制法如下 :烷基芳香化合物 (例如 :对二甲苯 )溶于反应溶剂 (例如 :醋酸 )中 ,在氧化催化剂的存在下 ,通过液相氧化即可制得芳香羧酸。由于副反应而生成的中间产物和副产物等氧化杂质可以在含催化剂的氢气处理液的存在下进行烷基芳烃的液相氧化来降低至最少程度。EP 10 85 0 0 5窗罩用含炭黑双向拉伸多层聚酯薄膜这种薄膜表面是透明聚酯膜 ,中间夹有着色聚酯层 ,夹层含… 相似文献
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本文根据我厂TA(对苯二甲酸)装置的实际运行状况,从工艺操作、设备运行、能源消耗以及产品的质量和产量等技术经济指标方面,对氧化“保持”和退料两种工况进行了对比分析,提出了氧化“保持”应控制的时间,为各TA装置的稳定运行提供一点参考。 相似文献
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采用溶剂热合成法合成了八种Mofs光催化材料.以La、Zr、Fe、Zn为金属中心,对苯二甲酸(H2BDC)、2-氨基对苯二甲酸(H2ATA)为有机配体.通过XRD、SEM、TEM、Uv-vis DRS、FTIR、莫特肖特基测试对光催化剂进行表征,考察了光催化剂的组成、晶型、形貌、禁带宽度、元素含量、氧化还原电势等性能,考察了可见光和紫外光辐照下光催化剂对苯酚的光催化氧化性能.结果 表明,使用10 mg的H2ATA-La在可见光照下降解20 mg/L的苯酚溶液,8h时降解率达97.45%. 相似文献
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采用溶剂热合成法合成了八种Mofs光催化材料.以La、Zr、Fe、Zn为金属中心,对苯二甲酸(H2BDC)、2-氨基对苯二甲酸(H2ATA)为有机配体.通过XRD、SEM、TEM、Uv-vis DRS、FTIR、莫特肖特基测试对光催化剂进行表征,考察了光催化剂的组成、晶型、形貌、禁带宽度、元素含量、氧化还原电势等性能,考察了可见光和紫外光辐照下光催化剂对苯酚的光催化氧化性能.结果 表明,使用10 mg的H2ATA-La在可见光照下降解20 mg/L的苯酚溶液,8h时降解率达97.45%. 相似文献
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降低对苯二甲酸(TA)产品中灰分的研究及应用 总被引:3,自引:0,他引:3
针对仪化公司精对苯二甲酸 (PTA)装置增容后对苯二甲酸 (TA)产品中的灰分高 ,从TA产品中灰分的组成入手 ,对影响灰分的主要因素 ,影响过程等进行了研究 ,找出了有效降低TA产品中灰分的方法 ,在实际生产中应用后取得了良好的效果。 相似文献
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Krishna K. Srivastava Sampatraj B. Chandalia 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1981,31(1):609-614
Liquid phase oxidation of p-xylene to terephthalic acid by air in the presence of solvent acetic acid and a relatively large amount of cobalt acetate as catalyst has been investigated in the absence of any promoter at 100–130°C and a pressure of 2.5–10 kg cm?2. The effect of temperature, catalyst concentration, p-xylene concentration, air flow rate, pressure, reaction period and addition of small amounts of zirconium salts, etc., on the conversion to terephthalic acid has been studied. p-Toluic acid, which is an intermediate in the process, was the only major by-product. The possibility of recycling the mother liquor after the separation of the product was ascertained. 相似文献
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精对苯二甲酸生产工艺新进展 总被引:3,自引:0,他引:3
介绍了近年以对二甲苯(PX)和对苯二甲酸(PTA)为原料生产聚酯的基本情况,以及以PX为原料的液相空气氧化法与加氢精制法生产PTA的工艺.着重论述扩大PTA生产规模、开辟生产PX新技术路线的最新动态,以及新型催化剂和超临界技术的应用等. 相似文献
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以对苯二甲酸和乙二醇为原料,采用自制催化剂合成出了对苯二甲酸二(β-羟乙基酯)(BHET).最佳反应条件:1 mol对苯二甲酸使用0.2 g催化剂,醇酸摩尔比为12∶1,反应时间为10h,反应温度为185℃.粗品经结晶、重结晶可得质量分数>99%的BHET产品. 相似文献
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精对苯二甲酸(purified terephthalic acid,PTA)是我国最重要的化工原料之一。对二甲苯(p-xylene,PX)氧化反应器是PTA装置的核心运行设备,PX氧化反应是高温高压下的固液相催化反应,其关系到整个装置的产量和消耗。目前,PX氧化反应过程的常规控制虽然可以满足工业装置的生产,但关键产品指标粗对苯二甲酸中对羧基苯甲醛(4-carboxybenzaldehyde,4-CBA)含量和尾气氧浓度波动范围较大,不利于工业装置的进一步优化操作。本文利用FRONT-Suite先进控制软件进行了工业PTA装置PX氧化反应过程的多变量预测控制,稳定优化了关键控制指标反应器尾氧浓度和第一结晶器尾氧浓度以及质量指标4-CBA含量的控制,取得了显著的控制效果。 相似文献
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The products of the ester exchange of DMT with EG in the presence of two catalysts (calcium acetate and a mixture of manganese and sodium acetate) obtained under manufacturing conditions have been investigated. The ester exchange product and the distillate obtained during different reaction times were analysed. On the base of the obtained results of the effect of the duration and temperature the reaction was established as well as of the type of catalyst on the progress of the fundamental and by-reactions. It was found that the trans-esterification proceeds through a mixed ester of terephthalic acid, namely methylethylolterephthalate. After the trans-esterification of the methylester groups of methylethylolterephthalate and DMT the reaction does not stop, but continues with the oligomerization of the diethylterephthalate. At the end of the process about 82% of oligomers are obtained when the catalyst is calcium acetate and 93% with the mixed catalyst. The experimental results show that part of the initial monomers participate in undesired side-reactions (by-processes): hydrolysis of DMT to terephthalic acid and breaking down of EG to acetaldehyde. The results obtained indicate the greater effectiveness of the mixed catalyst. 相似文献
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Purified terephthalic acid (PTA) is a fundamental raw material for polyester and textile industry. The p-xylene oxidation process and crude terephthalic acid (CTA) hydropurification process are the two main sections of industrial PTA production. 4-Carboxybenzaldehyde is a byproduct of the first section that can lower the polymerization rate and the average molecular weight of the polymer. In this work, an improved complete plant dynamic model of the second section, CTA hydropurification with catalyst deactivation, was developed based on Aspen Dynamics. The present contribution considered the performance of the proposed catalyst deactivation model (Azarpour and Zahedi, 2012). Moreover, we designed a control structure for this process with catalyst deactivation, and the performance of the resulting control structure was analyzed using several criteria. Results showed that the proposed system provides a better control system and higher profit for the process. 相似文献
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Masatoshi Yamamoto Takahiko Minoda Hiroshi Nishino Tatsuya Imoto 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1967,17(10):293-298
The oxidation of p-xylene in the presence of acetaldehyde as accelerator and cobalt acetate as catalyst at 60–100° was studied using a semi-batch process in a stirred reactor. Better yields of terephthalic acid (up to 98%) were given than with other methods although the operation was similar. Diffusion was the rate-determining step, and possibilities for improving reaction rate are discussed. 相似文献