糖醇碳酸盐合成通过转化丰富的糖醇和二甲基碳酸盐的转化,使用结合的MCM-41框架
Jakkrapong Jitjamnong1, Parinya Khongprom1,2, Thanate Ratanawilai3
1Department of Chemical Engineering, Faculty of Engineering, Prince of Songkla University Hat Yai Songkhla 90110 Thailand sukritthira.r@psu.ac.th.
RSC advances
|February 20, 2024
概括
这项研究优化了使用Li/MCM-41催化剂从废原油甘油中合成甘油碳酸盐 (GC). 该过程有效地将生物柴油副产品转化为有价值的化学物质,促进可持续性.
科学领域:
- 催化剂是一种催化剂.
- 绿色化学 绿色化学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 废原油糖醇是生物柴油生产的副产品,它带来了处置挑战,并代表了未充分利用的资源.
- 甘油碳酸盐 (GC) 是一种有价值的化学物质,具有多种工业应用,但从原始甘油中有效合成需要有效的催化方法.
- 与化学合成的同质催化剂相比,异质催化剂在分离和可重复使用方面具有优势.
研究的目的:
- 合成和表征一种Li/MCM-41异质催化剂,用于用二甲基碳酸盐 (DMC) 丰富的糖的转化.
- 用响应表面方法来优化反应条件,以最大限度地提高糖醇碳酸盐产量.
- 评估催化剂的效率,可重复使用性和从废物甘油中可持续化学生产的潜力.
主要方法:
- /MCM-41异质催化剂的合成.
- 使用各种分析技术 (TGA,ICP-OES,BET,XRD,SEM,FTIR) 进行催化剂物理化学性质的表征.
- 通过响应表面方法 (RSM) 和差异分析 (ANOVA) 来优化转化反应条件 (催化剂负荷,摩尔比率,温度,时间).
主要成果:
- 最佳催化剂被确定为5%Li/MCM-41,表现出4.72h-1的高周转频率 (TOF).
- 响应表面方法产生了一个预测二次模型 (R2 = 0.9743) 显示DMC:糖醇比率作为最有影响力的变量.
- 在最佳条件下,GC产量为58.77%,纯度为78%,催化剂重量为5.15%,DMC:糖比为4.24:1,温度为86°C,时间为165分钟. 催化剂在四个重复使用周期后保持了78.5%的活性.
结论:
- /MCM-41催化剂显示出显著的效率和潜力,可从废旧的原油甘油中可持续合成甘油碳酸盐.
- 优化的转化工艺有助于提升生物柴油副产品的价值,与循环经济原则保持一致.
- 这种催化方法为生产附加值化学品提供了一个有希望的途径,同时减轻了与废物甘相关的环境问题.
相关概念视频
Alkylation of β-Diester Enolates: Malonic Ester Synthesis
3.4K
Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.
3.4K
Alkylation of β-Ketoester Enolates: Acetoacetic Ester Synthesis
3.3K
Acetoacetic ester synthesis is a method to obtain ketones from alkyl halides and β-keto esters. The reaction occurs in the presence of an alkoxide base that abstracts the acidic proton of the β-keto esters. The step results in an enolate ion which is doubly stabilized. The enolate then reacts with an alkyl halide via the SN2 process to produce an alkylated ester intermediate with a new C–C bond. The hydrolysis of the intermediate, followed by acidification, results in an...
3.3K
Carboxylic Acids to Methylesters: Alkylation using Diazomethane
2.2K
Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
2.2K
Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview
18.0K
The Fischer esterification reaction was developed by the German chemist Emil Fischer in 1895. It is a condensation reaction between carboxylic acids and alcohols in an acidic medium to give esters and water.
18.0K
Preparation of Carboxylic Acids: Overview
2.5K
There are various methods for the preparation of carboxylic acids. For example, oxidation of primary alcohols or aldehydes using strong oxidizing agents results in a carboxylic acid. Aldehydes can also be oxidized in the presence of mild oxidizing agents.
2.5K
Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis
2.8K
Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
2.8K


