Removal of C3-C4 diols in ethylene glycol via selective dehydration reactions over Beta zeolite with acidity tailored was written by Ai, Shuo;Qin, Yue;Hong, Yuxiang;Liu, Linghui;Yu, Wanguo. And the article was included in Journal of Catalysis in 2022.Safety of Lithium chloride The following contents are mentioned in the article:
Biomass-derived ethylene glycol (EG) contains 1,2-propanediol (PDO) and 1,2-butanediol (BDO), and the elimination of PDO and BDO via dehydration reactions leads to EG loss due to acetalization. For the improvement of EG recovery, the selective inhibition of acetalization reaction on ion-exchange-modified H-Beta zeolite was investigated. In batch reactions, over Li2CO3-treated zeolite with ion-exchange ratio of 15%, the selectivity to acetals declined from 74% (untreated) to 24%. In continuous reactions, acetalization and oligomerization were obviously suppressed, and the zeolite stability was improved. EG consumption was reduced by half in both batch and continuous reactions. Microcalorimetry, NH3-TPD, PYIR, and FTIR results demonstrated that the strong Bronsted acid sites (Si(OH)Al) with NH3 adsorption heat ≥ 158 kJ/mol were responsible for the dehydration reactions, while Bronsted (excluding silanol group) and EFAl Lewis acid sites catalyzed the acetalization and oligomerization reactions. The activation barrier of acetalization between PDO and propanal was increased from 31.1 to 85.9 kJ/mol after the ion exchange, while that of PDO dehydration to propanal was almost kept constant (70-75 kJ/mol). Weak and moderate acid sites were removed by ion exchange, so acetalization and oligomerization were suppressed without evidently inhibiting dehydration reactions. This study involved multiple reactions and reactants, such as Lithium chloride (cas: 7447-41-8Safety of Lithium chloride).
Lithium chloride (cas: 7447-41-8) belongs to organic chlorides. An organic chloride is an organic compound containing at least one covalently bonded atom of chlorine. Their wide structural variety and divergent chemical properties lead to a broad range of names and applications. Aliphatic organochlorides are often alkylating agents as chlorine can act as a leaving group, which can result in cellular damage.Safety of Lithium chloride
Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics