A new method of amine solvent recovery with acid addition for energy reduction in the CO2 absorption process

Chemical absorption/stripping technologies using an amine-based solvent have a lot of advantages for capturing carbon dioxide in post-combustion capture system. However, the higher energy demand for the solvent recovery makes the technology difficult to retrofit to existing plants. To overcome this obstacle, an alternative stripping process using an organic acid was studied to decrease the solubility of carbon dioxide and save the energy demand, but further research is necessary to recover the amine solvent and an organic acid effectively. In this study, a new amine recovery method using an organic acid is proposed and the method suggests a two-step of reaction crystallization process to separate the amine and the acid. This study demonstrates that an amine solvent (monoethanolamine, MEA) and an organic acid (oxalic acid) could be recycled effectively by reaction crystallization experiment. MEA and oxalic acid recovery efficiencies were also obtained using the experimental data in this study. The percentages of MEA recovery and the acid losses were estimated through these data. In addition, the energy demands for two recovery processes were estimated.     

马深1超深井四开钻井液技术

马深1井是中石化勘探分公司部署在川东北通南巴构造带马路背构造高部位的一口重点预探井。完钻井深为8 418 m,目的层主探下寒武统龙王庙组储层。该井四开作业井段为6 225.4~7 699 m,钻遇龙马溪组时存在大段泥页岩地层,井壁稳定问题比较突出,且地层压力系数高,超深井段井温高,钻井液易受酸根污染,施工风险较大。该井四开钻井液技术难点主要是高温下高密度钻井液流变性控制、井壁稳定及酸根污染问题等。针对以上难点,通过大量室内实验,优选出以下几种主要处理剂:抗温强的聚胺抑制剂BCG-7,加量控制在0.4%;抗温主剂采用高温下降滤失效果好且不提黏的SMP-3,加量控制在5%~6%;抗温降滤失效果好且不提黏的聚合物类降滤失剂PFL-L及HPL-3,加量分别控制在2%及1.5%;抗温降黏剂选用HR-300、SMS-19,加量视情况而定;同时引入抗氧化剂,以提高体系的抗温性。最终确定钻井液基本配方为3% NV-1+0.3% KOH+5% KCl+1.5% HPL-3+1% AOP-1+3% SCL+3% FT+5% SMP-3+3% LF-1+0.4% BCG-7+3% QS-2。在马深1井现场应用时,根据实钻情况及时调整处理剂加量,对钻井液配方进行微调,在该井四开井段使用过程中,表现出高温高密度下流变性好、抑制能力强、封堵效果好及抗酸根能力强的特点。KCl-胺基聚磺钻井液技术为顺利完成马深1井四开井段的钻探工作提供了强有力的技术支撑,最终形成了一套完整的超深井钻井液技术。      

Aspen HYSYS酸性气流体包的应用及有机硫计算分析

利用某高含有机硫天然气净化装置的工程设计数据,用HYSYS软件v7.3和v9.0对Amine、DBR Amine和Acid Gas等3种醇胺法流体包进行了1级和2级吸收塔及再生塔的对比分析.结果表明:Amine及DBR Amine流体包不适用于COS的计算,用于板式塔计算时仅能用于单通道;用于填料塔计算时需将填料换算成...     

高耐热聚芳醚酮固化邻苯二甲腈树脂

以4-(4-羟基苯基)-2,3-二氮杂萘-1-酮、4,4’-二氟二苯甲酮和4-氨基苯酚为原料，通过两步一锅法合成了一种新型的氨基封端杂萘联苯聚芳醚酮(A-PPEK)，采用差示扫描量热法(DSC)探究了其对间苯二酚基邻苯二甲腈(DPPH)的固化性能。相比于常用的芳香二胺固化剂4,4’-二氨基二苯砜(DDS),A-PPEK的5%热失重温度(T_d5%)提高了69.3℃。另外，与DDS在400℃时快速升华不同，A-PPEK在相同温度下的质量保留率仍>95%，说明A-PPEK可以有效解决小分子固化剂高温下分解，容易在邻苯二甲腈树脂中形成缺陷的问题。一系列实验表明，以A-PPEK固化DPPH，体系具有优异的耐热性和加工流动性，当A-PPEK含量为DPPH质量的10%时，固化树脂的T_d5%可达553.2℃，玻璃化转变温度高于实验测试范围380℃，最低黏度可达0.167 Pa·s。