Screening of novel phase transfer agents and study of process conditions

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Apr.2025, Vol.48 No.4: 531-536

DOI: 10.3969/j.issn.1003-5060.2025.04.016

Authors

CHEN Xiaolong $ ^{1} $, ZHU Weiju $ ^{1} $, YANG Baojun $ ^{2} $, WANG Bainian $ ^{2} $, TONG Jiajia $ ^{2} $

(1. School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, China; 2. School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: In this paper, aiming at the main deficiencies in the preparation of $ CaCO_{3} $ by one-step phase transfer-precipitation method using sodium D-gluconate as the phase transfer agent, such as the high viscosity of the system and the difficulty in separating the precipitated $ CaCO_{3} $ after carbonization from the mother liquor, the phase transfer agents are screened and the process conditions are optimized. Taking the phase transfer rate of $ Ca^{2+} $ in phase transfer reaction as the main index, ammonium citrate (AC) is determined as the more suitable phase transfer agent for the phase transfer reaction from pre-treated phosphogypsum and the more suitable process conditions are determined as follows: $ n(\mathrm{AC}):n(\mathrm{CaSO_{4}\cdot2H_{2}O}) $ is 4:3, the reaction temperature is 5 °C, the reaction time is 10 min, and the stirring rate is 200 r/min, under which the average phase transfer rate of $ Ca^{2+} $ reaches 95.08%. The as-prepared $ CaCO_{3} $ sample is pure calcite $ CaCO_{3} $. The mother liquor after carbonization is suited to reuse in the phase transfer reaction with a $ Ca^{2+} $ mass fraction of 0.17%.

Keywords: phosphogypsum; calcium carbonate; phase transfer; ammonium citrate(AC)

作者信息

陈小龙 $ ^{1} $，朱维菊 $ ^{1} $，杨保俊 $ ^{2} $，王百年 $ ^{2} $，童佳佳 $ ^{2} $

(1. 安徽大学化学与化工学院, 安徽合肥 230601; 2. 合肥工业大学化学与化工学院, 安徽合肥 230009)

摘要和关键词

摘要: 文章针对一步相转移-沉淀法制备 $ CaCO_{3} $ 工艺中以 D-葡萄糖酸钠为相转移剂所存在的体系黏度较大、碳化后所生成的 $ CaCO_{3} $ 沉淀与母液之间分离困难等主要问题，对新型相转移剂的筛选及工艺条件优化进行研究。以预处理后磷石膏为原料，相转移反应 $ Ca^{2+} $ 相转移率为主要考察指标，筛选并确定较适宜的新型相转移剂为柠檬酸铵（ammonium citrate，AC）。考察并确定较适宜的相转移反应工艺条件如下： $ n(\mathrm{AC}):n(\mathrm{CaSO_{4}\cdot2H_{2}O}) $ 为 4:3，反应温度为 $ 5^{\circ}C $，反应时间为 10 min，搅拌速率为 $ 200\ r/min $；此条件下平均 $ Ca^{2+} $ 相转移率为 95.08%。相转移液经碳化后，所制备的 $ CaCO_{3} $ 样品为纯相方解石型 $ CaCO_{3} $；碳化母液中 $ Ca^{2+} $ 质量分数为 0.17%，适于返回相转移反应工序循环使用。

关键词: 磷石膏；碳酸钙；相转移；柠檬酸铵（AC）

Funding

安徽省科技重大专项资助项目（18030901100）；安徽省自然科学基金资助项目（1808085ME155）

合肥工业大学学报(自然科学版)

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