摘要
用CaCl2、CuCl2和AgNO3溶液对NaX沸石进行离子交换改性,以所得的CaX、CuX、AgX材料以及NaX和Al2O3为吸附剂,通过吸附性能评价和X射线衍射(XRD)、红外(FT-IR)等表征方法,对吸附法脱除三氟二氯乙烷(R123)中六氟氯丁烯(R1326)杂质进行了研究。结果表明:R1326在各吸附剂上的吸附属于化学吸附;以将R1326脱除至检测限以下、R123不发生明显分解为标准时,CaX的吸附性能最优异,吸附温度最低(220℃),对R1326脱除至检测线以下时的吸附容量达0.066g·g·1,这与其具有良好的X型分子筛晶体结构和一定的酸性有关。CaX的再生性能不佳,原因是其吸附饱和后丧失了X型分子筛晶体结构。
Using CaCl2, CuCl2 and AgNO3 solutions, CaX, CuX and AgX zeolites were prepared by ion exchange method, and the prepared CaX, CuX AgX together with NaX and Al2O3 materials were used as adsorbents to investigate the removal of 1,1,1,3,3,3-hexafluoro-2-chloro-butylene （R1236） from 1,1,1-trifluoro-2,2-dichloro-ethane （R123）, respectively. Besides, the structures of these adsorbents were characterized by the X-ray diffraction （XRD） and infrared spectra （FT-IR） techniques before and after adsorption. Results show that there is relationship between adsorptive activity and crystal structure of the adsorbents, and the adsorption of R1236 on these adsorbents belongs to the chemical adsorption. Taking that in the purified R123 product, the content of R1236 is below the detection limit and no new impurities appear as judging standard, the adsorption performance of CaX zeolite is the best among those adsorbents mentioned above. The reasons are that the suitable adsorption temperature of Ca2（ is the lowest （220℃） and its R1236 adsorption capacity is as high as 0.066 g·g^-1. Those fine adsorption performances of CaX are probably due to its X-zeolite structure and it in possession of certain acidity. However the adsorption performance of the regenerated CaX zeolite is bad, since its R1236 adsorption capacity is very low which may attribute to the destruction of the X-zeolit crystal structure of CaX after adequately adsorbing R1236 and can＇t be recovered during regeneration.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2007年第4期608-613,共6页
Journal of Chemical Engineering of Chinese Universities
基金
浙江省重点科技攻关计划项目(2005C21055)
关键词
离子交换
吸附
三氟二氯乙烷
六氟氯丁烯
ion-exchange
adsorption
1,1,1-trifluoro-2,2-dichloro-ethane
1,1, 1,3,3,3-hexafluoro-2-chloro-butylene
