高压下二氧化碳与正辛烷,正壬烷二元系汽液相平衡

高压下二氧化碳与正辛烷、正壬烷二元系汽液相平衡云志，史美仁，时钧（南京化工大学化工系，南京２１０００９）关键词相平衡，二氧化碳，正辛烷，正壬烷１前言对于高压下的二氧化碳－烃类体系，人们已经做了不少相平衡的测定与研究工作，其中尤以含六个碳以下的烃类体系...     

一种低毒混合溶剂对树脂的溶解性及制作树脂包膜肥料的影响

通过比较正辛烷、正壬烷和松节油组成的混合溶剂与纯松节油对树脂材料的溶解性能及对包膜肥料品质的影响,发现混合溶剂能够加快树脂成分的溶解速度,降低包膜肥料成品的溶剂残留,有利于提高包膜肥料的生产效率,改善产品品质。     

Characterization of Acidity and Porosity of Zeolite Catalysts by the Equilibrated Thermodesorption of n-Hexane and n-Nonane

Thermodesorption of n-hexane and n-nonane from the acidic and non-acidic zeolites ZSM-5 and Y was studied by means of the thermogravimetric temperature programmed equilibrated desorption (TPED) and quasi-equilibrated temperature programmed desorption and adsorption (QE-TPDA). Micropore volumes determined from the adsorption capacity of n-hexane were close to those determined by N₂ adsorption. Content and strength of acid sites in the acidic zeolites estimated by fitting the Arrhenius equation to the high temperature parts of QE-TPDA profiles of n-hexane attributed to its cracking were in agreement with their acidity characteristics obtained by IR spectroscopy of chemisorbed pyridine. The mesopore volume was determined from the QE-TPDA profiles of n-nonane. Coking observed only for QE-TPDA of n-nonane on H-USY zeolite resulted in blocking the micropores without affecting the mesopores.