摘要
以吸收剂吸收速率和再生程度为指标,在小型实验装置台上研究了3种混合吸收剂不同配比的吸收和再生特性,以确定其吸收剂主体和添加剂的合适配比.结果表明,在甲基二乙醇胺(MDEA)中添加哌嗪(PZ),当混合吸收液CO2负荷为0.2mol.mol-1时,MDEA∶PZ=1∶0.4(m∶m)混合液CO2吸收速率比MDEA∶PZ=1∶0.2(m∶m)混合液提高了约70%.再生40 min,PZ相对浓度为0的吸收液再生程度为91.04%,PZ相对浓度为0.2、0.4和0.8时,混合吸收液的再生程度分别降低为83.06%、77.77%和76.67%.综合比较,MDEA∶PZ=1∶0.4(m∶m)是该混合吸收液合适的配比,吸收速率和再生特性都有较好改善.在10%一级胺中添加2%三级胺既能保持高吸收效率,又能略微降低再生能耗.在10%二乙醇胺(DEA)中加入2%2-氨基-2-甲基-1-丙醇(AMP),混合液表现出DEA/AMP混合吸收剂中较好的吸收和再生特性.3种配方中,在一级胺中添加少量三级胺吸收速率最高,二级胺和少量空间位阻胺混合吸收剂的再生性能最好.而综合吸收和再生2个指标,三级胺和中量活化剂的混合液有优势.
Three kinds of blended absorbents were investigated on bench-scale experimental bench according to absorption rate and regeneration grade to select a reasonable additive concentration. The results show that, among methyldiethanolamine （MDEA） and piperazine（PZ） mixtures, comparing MDEA ： PZ = 1 ： 0.4 （ m ： m ） with MDEA ： PZ = 1 ： 0.2 （ m ： m ）, the absorption rate is increased by about 70 % at 0.2 mol·mol^-1 . When regeneration lasting for 40 rain, regeneration grade of blended absorbents with PZ concentration of 0.2,0.4, and 0.8 is decreased to 83.06% ,77.77% and 76.67% respectively while 91.04% for PZ concentration of 0. MDEA： PZ = 1：0.4（ m： m） is a suitable ratio for MDEA/PZ mixtures as absorption and regeneration properties of the blended absorbents are all improved. The aqueous blends with 10% primary amines and 2% tertiary amines could keep high CO2 absorption rate, and lower regeneration energy consumption. Adding 2% 2- Amino-2-methyl-l-prepanol （AMP） to 10% diethanolamine （DEA）, the blended amine solvents have an advantage in absorption and regeneration properties over other DEA/AMP mixtures. Blended solvents, which consist of a mixture of primary amines with a small amount of tertiary amines, have the highest absorption rate among the three. And mixed absorbents of secondary amines and a small amount of sterically hindered amines have the best regeneration property. To combine absorption and regeneration properties, blends with medium activator addition to tertiary amines are competitive.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2007年第11期2630-2636,共7页
Environmental Science
基金
国家自然科学基金项目(50676083)
关键词
混合吸收剂
化学吸收法
CO2
新型
blended absorbent
chemical absorption method
carbon dioxide
new
