从甲醇中联合生产二甲基碳酸盐,二甲基甲和二甲基乙烯:工艺设计和力分析
Shuxing Zhang1, Xiaoshu Ding1, Helen Shang2
1School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China.
Entropy (Basel, Switzerland)
|July 8, 2023
概括
一个新的"反应而不是分离"生产二甲基碳酸盐 (DMC) 的战略,将其与二甲基甲 (DMM) 和二甲基 (DME) 共同生产,显著提高能源效率和甲醇转化.
科学领域:
- 化学工程是化学工程的重要组成部分.
- 绿色化学 绿色化学
背景情况:
- 二甲基碳酸盐 (DMC) 是一种重要的绿色化学物质.
- 现有的甲醇碳化为DMC具有较低的转换和高的能量分离成本,由于甲醇-DMC亚热.
研究的目的:
- 开发一种新的,节能的DMC生产工艺.
- 为了克服传统的DMC合成中的分离挑战.
主要方法:
- 提出了一个"反动而不是分离"的战略.
- 开发了DMC,二甲氧甲 (DMM) 和二甲 (DME) 的联合生产工艺.
- 使用Aspen Plus进行过程模拟和运动分析.
主要成果:
- 达到高达99.9%的产品纯度.
- 与单一生产工艺相比,减少了276%的能量破坏.
- 将甲醇转化率提高到95%,能源需求降低.
结论:
- 联合生产过程在能源效率和材料节约方面提供了显著的改进.
- "反应而不是分离"的策略对于亚热分离的挑战是可行的.
- 这种开发的工艺为现有的DMC生产方法提供了有利的替代方案.
相关概念视频
02:35Ethers from Alkenes: Alcohol Addition and Alkoxymercuration-Demercuration
8.0K
Overview
Ethers can also be prepared from alkenes through acid-catalyzed addition of alcohols and alkoxymercuration–demercuration.
Preparation of Ethers by Acid-Catalyzed Addition of Alcohol to Alkenes
The acid-catalyzed addition of alcohol to an alkene involves treating the alkene with an excess of alcohol in the presence of an acid catalyst to form an ether under suitable conditions. The hydrogen will add to the less substituted carbon so that the nucleophile can attack the more...
Ethers can also be prepared from alkenes through acid-catalyzed addition of alcohols and alkoxymercuration–demercuration.
Preparation of Ethers by Acid-Catalyzed Addition of Alcohol to Alkenes
The acid-catalyzed addition of alcohol to an alkene involves treating the alkene with an excess of alcohol in the presence of an acid catalyst to form an ether under suitable conditions. The hydrogen will add to the less substituted carbon so that the nucleophile can attack the more...
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01:33Carboxylic Acids to Methylesters: Alkylation using Diazomethane
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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.
2.3K
02:29Ethers from Alcohols: Alcohol Dehydration and Williamson Ether Synthesis
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Overview
Ethers can be prepared from organic compounds by various methods. Some of them are discussed below,
Preparation of Ethers by Alcohol Dehydration
In this method, in the presence of protic acids, alcohol dehydrates to produce alkenes and ethers under different conditions. For example, in the presence of sulphuric acid, dehydration of ethanol at 413 K yields ethoxyethane, whereas it yields ethene at 443 K.
Ethers can be prepared from organic compounds by various methods. Some of them are discussed below,
Preparation of Ethers by Alcohol Dehydration
In this method, in the presence of protic acids, alcohol dehydrates to produce alkenes and ethers under different conditions. For example, in the presence of sulphuric acid, dehydration of ethanol at 413 K yields ethoxyethane, whereas it yields ethene at 443 K.
10.6K
01:14Alkylation of β-Diester Enolates: Malonic Ester Synthesis
3.5K
Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.
3.5K
02:15Preparation of Alcohols via Addition Reactions
6.3K
Overview
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
6.3K
03:08Hydroboration-Oxidation of Alkenes
8.4K
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
8.4K