排序方式: 共有13条查询结果,搜索用时 15 毫秒
1.
2.
在内径为100mm的玻璃萃取塔内,采用甲基异丁基酮(MIBK)和二异丙醚(DIPE)两种煤化工废水处理常用的脱酚萃取剂,系统研究了新型导向格栅规整填料(DFG)的水力学特性和传质性能.结果表明:两种萃取体系的流体力学特性可以用改进型关联式较好地描述;导向格栅填料萃取塔的运行通量比国内常规萃取塔有大幅度的提高,试验范围内液泛通量最高达150m3/(m2·h);传质性能与国内常用规整填料相近,理论级当量高度在2.2~3.1m之间.导向格栅填料可以满足煤化工生产规模不断扩大对脱酚萃取塔的需求. 相似文献
3.
4.
5.
采用膜分离技术取代当前的蒸发工艺回收植物油浸取工艺中的浸取溶剂,这一新技术不涉及相变,节能效果明显.为此,研制了单壁碳纳米管填充聚二甲基硅氧烷/聚偏氟乙烯(PDMS/PVDF)复合膜,通过接触角和SEM等方法对复合膜的表面进行表征.将制备的复合膜应用于从大豆油/正己烷(质量比1∶3)混合油中回收溶剂正己烷,考察了碳纳米管填充量和高温纯化处理对复合膜分离性能的影响.结果表明,碳纳米管经高温纯化预处理后,所制成填充复合膜的分离性能得到了较大的提高. 相似文献
6.
将纳米级白炭黑填充于PDMS制备了白炭黑填充PDMS/PVDF复合膜,采用红外(FT-IR)、热失重(TGA)和接触角(CA)等方法对填充复合膜进行了分析和表征,并采用纳滤的方法系统研究了复合膜对大豆油/己烷混合油的分离性能。结果表明,白炭黑填充能有效促进PDMS的交联,提高PDMS的疏水性、热失重温度以及对溶剂的稳定性;白炭黑填充量增加使复合膜渗透通量降低,但截留率从96%提高到98%;随溶液浓度增加,渗透通量和截留率同时降低;随温度的升高,渗透通量上升,截留率降低。大豆油和己烷在膜中的传质特性可用不完全的溶解-扩散模型描述,溶液渗透压实验值与计算值符合较好。 相似文献
7.
8.
9.
Traditional solvent recovery in the extraction step of edible oil processing is distillation, which consumes large amounts of energy. If the distillation is replaced by membrane process, the energy consumption can be reduced greatly. In this work, two kinds of membrane, PDMS (polydimethylsiloxane) composite membrane and Zeolite filled PDMS membrane were prepared, in which asymmetric microporous PVDF (polyvinylidenefluoride) membrane prepared with phase inversion method was functioned as the microporous supporting layer in the flat-plate composite membrane. The different function compositions of the PDMS/PVDF com-posite membranes were characterized by reflection Fourier transform infrared (FTIR) spectroscopy. The surface and section of PDMS/PVDF composite membranes were investigated by scanning electron microscope (SEM). The PDMS NF (nanofiltration) membranes were then applied in the recovery of hexane from soybean oil/hexane miscellas (1︰3, mass ratio). The effects of pres-sure (0.5-1.5 MPa), cross-linking temperature and PDMS layer thickness on membrane performances were investigated. The results indicated that both two kinds of NF membranes were promising for solvent recovery, and zeolite filled in PDMS NF membrane could enhance the separation performance. 相似文献
10.