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以α-氯代十二酸(CDA)为原料,通过水热碱性水解反应合成了α-羟基十二酸钠(SHD),用FTIR及1HNMR鉴定了SHD的酸化产物α-羟基十二酸(HDA)的结构。探讨了水热碱性水解反应中反应温度、反应时间和NaOH质量分数的影响,结果表明,当n(NaOH)∶n(CDA)=2.1∶1、w(NaOH)=10%时,在160℃水热反应6 h,SHD的产率达98.7%。测定了SHD的克拉夫特点(KP)、抗硬水性、钙皂分散剂消耗量、泡沫力、表面张力和临界胶束浓度,并与十二酸钠(SD)进行比较。SHD的KP为35℃,比SD的低8℃,因而具有更好的冷水溶解性;SHD在硬水中的稳定性比SD有所提高,且钙皂分散剂消耗量仅为SD的一半,因而具有更好的硬水溶解性;因此,SHD具有用作低温皂和抗硬水皂新原料的潜质。
Α-Hydroxydodecanoate (SHD) was synthesized by hydrothermal alkaline hydrolysis using α-chlorododecanoic acid (CDA) as raw material. The acidification products of SHD, α-hydroxylauric acid, were identified by FTIR and 1HNMR. (HDA) structure. The effects of reaction temperature, reaction time and NaOH mass fraction on the hydrothermal alkaline hydrolysis were investigated. The results showed that when the molar ratio of n (NaOH): n (CDA) = 2.1:1 and w (NaOH) = 10% ℃ hydrothermal reaction 6 h, SHD yield of 98.7%. The SHF KF, water hardness, calcium soap dispersant consumption, foam strength, surface tension and critical micelle concentration were measured and compared with sodium dodecanoate (SD). SHD has a KP of 35 ° C, which is 8 ° C lower than SD, and therefore has better cold water solubility; the SHD stability in hard water is higher than that of SD, and the consumption of calcium soap dispersant is only half of that of SD Has better hard water solubility; therefore, SHD has the potential to be used as a new raw material for low temperature soaps and anti-hard soaps.