均苯四甲酸二酐

气相法均苯四甲酸二酐生产工艺及其冷凝态收集方法

Productive Process of PMDA by Air Phase Oxidation and Its Collecting Methods by Condensing Mode

Fenton试剂预处理高浓度均苯四甲酸二酐生产废水的研究

Pretreatment of high concentration pyromellitic dianhydride production wastewater by Fenton reagent

以异佛尔酮二异氰酸酯，分散红-19和均苯四甲酸二酐合成聚氨酯-酰亚胺（PUI）；

The poly ( urethane-imide )( PUI ) which uses isophorone diisocyanate , dispersed red19 ( DR-19 ), and pyromellitic dianhydride is synthesized .

首先以SO4~（2-）/TiO2-Al2O3固体酸为催化剂、均苯四甲酸二酐和异辛醇为原料合成TOPM。

Above all , synthesis of TOPM from pyromellitic dianhydride and isooctyl alcohol over the solid acid SO_4 ~ ( 2 - ) / TiO_2-Al_2O_3 was studied .

以均苯四甲酸二酐、4,4′二胺基二苯醚为原料，通过缩聚反应制备了聚酰胺酸，采用凝胶渗透色谱（GPC）考察了反应时间对产物重均摩尔质量的影响；

Polyamide acid was prepared by means of polycondensation , taking PMDA and ODA as raw materials , and the effect of reaction time on the change of the weight-average molar mass of polyamide acid was measured by gel permeation chromatography ( GPC ) .

密炼实验结果表明：一定量的均苯四甲酸二酐（PMDA）能够增加R-PET扩链/支化度，从而熔体流动速率减小，结晶温度和熔融温度降低。

Batch mixer experimental results showed that a certain amount of PMDA could increase the chain extension / branching degree of R-PET , which led to the decrease in melt flow rate , crystallization temperature and melting temperature .

以均四甲苯气相催化氧化制备均苯四甲酸二酐为研究对象，通过测定催化剂表面酸性，研究了以V2O5为基础，加入其它金属氧化物的多元组分催化剂的表面酸性与氧化选择性和活性的关系；

In this paper , the relationship of surface activity of V_2O_5-based catalysts with selectivity and activity in catalytic oxidation of durene was studied . In the catalytic reaction , pyromellitic dianhydride was prepared by catalytic vapor-phase oxidation of durene over V_2O_5-based catalysts .

均苯四甲酸二酐生产中废料的回收利用

Recycle of pyromellitic dianhydride from waste of production

均苯四甲酸二酐产品中主要含有偏苯三酸酐、苯酐等副产。

Trimellitic anhydride and o-phthalic anhydride are the mainly by-products in the producing process of pyromellitic anhydride .

介绍了从均四甲苯固定床气相氧化法的高温反应气中捕集低浓度的均苯四甲酸二酐的各种方法。

The methods of collecting pyromellitic dianhydride which is low concentration from the high temperature reaction gas prepared by the gas phase catalytic oxidation of durene are introduced .

气相氧化法是将空气与汽化后的均四甲苯混合进入含有催化剂的氧化反应器进行氧化反应，反应产物经换热冷却后，均苯四甲酸二酐直接从气相中凝华捕集。

In the method of air phase oxidation the mixed gas that boiling 1,2,4,5-tetramethyl benzene is combined with air is carried into oxidation reactor and reacts and then product gas is cooled .

通过比较、分析指出了直接冷却法中有机溶剂湿壁捕集法和水-空气捕集法是均苯四甲酸二酐捕集方法的研究和发展方向。

Through the comparison and analysis it concludes that the direct cooling collecting methods by organic solvent and water-air will be the study and development trends of technologies of collecting pyromellitic dianhydride .