摘要
采用活性炭作为吸附剂进行相变石蜡吸附精制工艺正交试验研究,利用紫外分光光度计测定相变石蜡的脱色率,研究活性炭用量、吸附温度、吸附时间对脱色率的影响,确定最佳的吸附精制工艺,并采用自动吸附仪、气相色谱分析仪和差示扫描量热仪分别测定活性炭的孔结构和比表面积、相变石蜡的正构烷烃分布和热性能。实验结果表明:活性炭的BET总比表面积为1718.49m2/g,BJH平均孔径为3.2nm,微孔体积为0.320m3/g。最优吸附工艺为活性炭用量8%、吸附温度120℃、吸附时间60min时,脱色率达到86.57%,正构烷烃含量为89.89%,提高了4.38%,相变潜热为164.9J/g,提高了12.33%。
Phase change paraffin was prepared by adsorption refining with activated carbon as absorbent. The effects of adsorption temperature, absorption time and amount of absorbents on decoloration rate of phase change paraffin were investigated. Orthogonal test was used to optimize the adsorption refining process of phase change par- affin. Specific surface areas and pore size distributions of activated carbon were measured by using adsorption appa- ratus. Latent heat storage capacity was measured by using DSC. Carbon number distribution of phase change paraffin was analyzed by using gas chromatography. The results showed that the BET specific surface area of activated carbon was 1718.49 m2/g, BJH average pore size was 3.2 nm and micropore volume was 0. 320 m3/g. Phase change paraffin prepared by adsorption temperature of 120℃, adsorption time of 60min and adsorbent dosage to the quantity of phase change paraffin of 8% had excellent thermal stability with latent heat storage capacity of 164.9J/g and decoloration rate of 86.57%. Carbon number distribution of n-alkanes in phase change paraffin also reached 89.89%, increasing by 4.38% compared with that didn＇ t treat with activated carbon.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2012年第9期1610-1614,共5页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(21006030)
关键词
相变石蜡
活性炭
脱色率
正交试验
phase change paraffin
activated carbon
decoloration rate
orthogonal test
