HYDROFLUOROCARBON REFRIGERANT COMPOSITIONS AND USES THEREOF
申请人:MINOR HAVILAND BARBARA
公开号:US20070289317A1
公开(公告)日:2007-12-20
Disclosed herein are hydrofluorocarbon refrigerant or heat transfer fluid compositions that are useful in refrigerain or air conditioning apparatus or as heat transfer fluids. The compositions of the present invention are also useful in centrifugal compressor apparatus that employ two-stage compressors or single slab.single pass heat exchangers.
Preparation, structure and thermal behaviour of uranyl nitrate complexes with N-alkylcaprolactams
作者:Li Yang、Zhenrong Lu、Zhengbai Cao、Hanzhang Wang
DOI:10.1016/0040-6031(92)80290-d
日期:1992.11
Abstract A new series of uranyl complexes with N -alkylcaprolactams (alkyl = H, C 2 H 5 , C 4 H 9 , C 6 H 13 , C 8 H 17 , C 10 H 21 or C 12 H 25 ) has been prepared. All these complexes have hexagonal bipyramid structure. The stereochemical configurations were deduced using spectral and X-ray diffractometry studies. The thermalbehaviour of each complex and some of the ligands has been investigated
摘要 制备了一系列新的铀酰与N-烷基己内酰胺(烷基=H、C 2 H 5 、C 4 H 9 、C 6 H 13 、C 8 H 17 、C 10 H 21 或C 12 H 25 )的配合物。所有这些配合物都具有六边形双锥结构。使用光谱和 X 射线衍射研究推导出立体化学构型。已使用 TG 和 DSC 研究了每种配合物和一些配体的热行为。
Compositions containing lactone compatibilizers
申请人:Fagan Joseph Paul
公开号:US20050127321A1
公开(公告)日:2005-06-16
The present invention relates to compositions that are useful for compatibilizing a conventional compression refrigeration lubricant and a hydrofluorocarbon and/or hydrochlorofluorocarbon refrigerant in a compression refrigeration or air conditioning system. Additionally, these compositions promote efficient return of lubricant from the non-compressor zones to the compressor zones of refrigeration and air conditioning systems.
A process for preparing an N-alkyllactam, comprising the steps of: (a) reacting a lactam with an alkali metal alkoxide at 130.degree.-170.degree. C. and removing the alcohol formed by distillation; (b) reacting the product from step (a), if desired in a mixture with the product from step (e), with an alkyl halide in a solvent which is (i) an ethylene glycol dialkyl ether of the formula R--O--(CH.sub.2 --CH.sub.2 --O).sub.m R, where R in C.sub.1 -C.sub.4 -alkyl and m is 1-8, (ii) the N-alkyllactam to be prepared or (iii) a mixture of (i) and (ii), to obtain crude N-alkylactam or an alkali metal salt; (c) separating the alkali metal salt from the crude N-alkylactam; (d) subjecting the N-alkyllactam crude product to high-purity distillation after addition of a sufficient amount of alkali metal alkoxide to convert any unreacted lactam to a salt; and (e) recycling the bottom product of the distillation in step (d) in step (e) into step (b), is environmentally friendly and affords the desired N-alkyllactam in high yield and high purity.