Abstract:

Carbon dioxide（CO₂）absorption performance was investigated in a total 40% amine solution of piperazine（PZ），N-aminoethyl piperazine（N-AEPZ）and hydroxyethyl piperazine（HEPZ）. The CO₂ absorption performance was also carried out in aqueous amine solutions with mass content of 30%AEE+10%PZ，30%AEE+10% N-AEPZ and 30%AEE+10%HEPZ. The absorption process was estimated by the correlation with absorption rate，absorption capacity，absorption time，PZ content and system temperature. The absorption temperature was controlled at 313 K. The desorption temperature was controlled at 393K to estimate the interrelation of desorption capacity and desorption time. It was observed that molecules with amino group can help improving absorption capability. In the composite system，N-AEPZ is the main absorbent，PZ and AEE absorb CO₂ together；in the 30%AEE+10%HEPZ amine solution，AEE is the main absorbent. The increase in main absorbent component concentration can improve the absorption capacity. The mixed solution of 30%AEE+10%PZ showed a good actual operation both in absorption and desorption process.

摘要：

研究了313 K时40%（质量分数）哌嗪（PZ）、N-氨乙基哌嗪（N-AEPZ）和羟乙基哌嗪（HEPZ）溶液吸收CO₂性能以及30% AEE+10%PZ、30%AEE+10%N-AEPZ和30%AEE+10%HEPZ溶液对CO₂的吸收性能。考察了吸收速率、吸收量、吸收时间、温度变化和PZ及其衍生物含量之间的相互关系。考察了解吸量与解吸时间的关系，解吸温度为393 K。结果表明，分子结构中的多氨基基团有利于提高吸收性能；在复合体系中，N-AEPZ为主吸收作用，PZ与AEE共同作用，HEPZ为助吸收作用，提高主吸收组分的浓度有利于提高溶液的吸收能力，其中30%AEE+10%PZ的混胺溶液具有良好的吸收和解吸性能。