化工进展 ›› 2023, Vol. 42 ›› Issue (1): 409-416.DOI: 10.16085/j.issn.1000-6613.2022-0540

• 精细化工 • 上一篇    下一篇

超声辅助下皂脚加压水解制备脂肪酸

李栋先1(), 王佳1,2(), 蒋剑春1,2   

  1. 1.南京林业大学化学工程学院,江苏 南京 210037
    2.中国林业科学研究院林产化学工业研究所,江苏 南京 210042
  • 收稿日期:2022-04-01 修回日期:2022-05-01 出版日期:2023-01-25 发布日期:2023-02-20
  • 通讯作者: 王佳
  • 作者简介:李栋先(1996—),男,硕士研究生,研究方向为有机固废热化学转化。E-mail:ldx@njfu.edu.cn
  • 基金资助:
    国家重点研发计划(2019YFB1504001)

Producing aliphatic acids via pressurized hydrolysis of soapstock assisted by ultrasound

LI Dongxian1(), WANG Jia1,2(), JIANG Jianchun1,2   

  1. 1.College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, China
    2.Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing 210042, Jiangsu, China
  • Received:2022-04-01 Revised:2022-05-01 Online:2023-01-25 Published:2023-02-20
  • Contact: WANG Jia

摘要:

为了回收利用油脂精炼过程中产生的副产品皂脚中的有效成分,利用超声波辅助技术将皂脚一步转化为脂肪酸,意在考量超声波辅助技术在皂脚酸化水解过程中的作用,并在超声辅助下探究工艺条件的影响。以产物酸价和得率作为考察目标,探究了超声辅助酸化水解对产物分布的影响。结果表明,超声的分散搅拌作用使得产物的酸价和得率得到提升。通过单因素和正交设计实验探究各因素对产物酸价和得率的影响,进而确定制备脂肪酸的最佳反应条件。实验结果表明,以甲酸为酸催化剂,在反应温度220℃、反应时间110min、超声功率1050W、超声持续时间7s的反应条件下,产物酸价和得率均得到最高值,分别为184mg KOH/g和79.9%;影响产物得率的因素从主到次:反应温度>超声持续时间>超声功率>反应时间。经气相色谱质谱联用仪分析表明,产物中脂肪酸含量达到97.4%;产物质量指标测定结果表明产物具有较高的质量,皂化值达到190mg KOH/g,碘值达到157g I/100g,不皂化物含量达到0.54%。

关键词: 超声波辅助, 皂脚, 回收, 水解, 脂肪酸

Abstract:

To recycle the valuable by-product of the oil refining industry, ultrasonic assisted technology was used to produce fatty acids in one step from the soapstock. The goal was to test the acidification hydrolysis of soapstock by the ultrasonic assisted technology, and to explore the influence of process conditions with ultrasonic assistance. The acid value and yield of the product were taken as the inspection targets, and the influence of ultrasonic assistance on the product distribution was explored. Experimental results indicated that the acid value and yield of fatty acids were improved because of the enhanced dispersion and stirring of ultrasound. In order to determine the optimal reaction conditions, the effects of each factor on the acid value and yield of the product through single factor and orthogonal design experiments were discussed. Results showed that with formic acid as the catalyst, under the conditions of reaction temperature 220℃, reaction time 110min, ultrasonic power 1050W and ultrasonic duration 7s, the highest acid value and yield of the product were 184mg KOH/g and 79.9%, respectively. The order of factors affecting the yield of product from primary to secondary were reaction temperature, ultrasonic duration, ultrasonic power, and reaction time. The GC-MS analysis showed that the fatty acid content in the product reached 97.4%. The results of product quality index test showed that the product had high quality with saponification value 190mg KOH/g, iodine value 157g I/100g, and unsaponifiable matter content 0.54%.

Key words: ultrasound assisted, soapstock, recovery, hydrolysis, fatty acids

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