Synthesis of palm acid polyol esters catalyzed by acidic ionic liquid was written by Niu, Yu-lian;Xing, Bao-mei;Lu, Yang;Li, Zai-jun;Liu, Jun-kang;Huang, Lu. And the article was included in Jiangnan Daxue Xuebao, Ziran Kexueban in 2011.Formula: C10H20N2O4S The following contents are mentioned in the article:
Five acidic ionic liquids were investigated to synthesize palmitoleic acid polyol esters, the results indicated triethylammonium sulfate offers best catalytic activity. Based on temperature-controlled characteristics of triethylammonium sulfate, we designed a novel method for preparation of palmitoleic acid polyol esters, in which the reaction under relatively high temperature combined with the separation of the ionic liquid under relatively low temperature The optimal conditions to produce palmitoleic acid pentaerythritol esters were obtained, and these include a 6:1 of palmitoleic acid/pentaerythritol, 5% of the ionic liquid, 210°C of the reaction temperature and 3.5 h of reaction time. Under corresponding optimal conditions, five palmitoleic acid pentaerythritol esters, which includes palmitoleic acid pentaerythritol ester, palmitoleic acid trimethylolpropane ester, palmitoleic acid dihydroxymethylneopentane ester, palmitoleic acid sorbitol ester and palmitoleic acid 1,3-butanediol ester, were synthesized in the laboratory, and their conversion rates were 94.6%, 94.5%, 97.0%, 98.5% and 99.2%, resp. After the completion of reaction, the triethylammonium sulfate precipitates and separates from the system with decreasing the temperature The ionic liquid obtained can be used to subsequent new synthesis of palmitoleic acid polyol ester. The physicochem. properties of five palmitoleic acid polyol esters were investigated, the results exhibited these are of excellent fluid and low temperature characteristics, their viscosity index and pour point were in the range of 184∼388 and -23∼-40°C resp., the data confirm palmitoleic acid polyol ester can be used as base oil of biodegradable lubricant. This study involved multiple reactions and reactants, such as 1-Hexyl-3-methyl-1H-imidazol-3-ium hydrogensulfate (cas: 478935-29-4Formula: C10H20N2O4S).
1-Hexyl-3-methyl-1H-imidazol-3-ium hydrogensulfate (cas: 478935-29-4) belongs to imidazole derivatives. 1H-imidazole is an imidazole tautomer which has the migrating hydrogen at position 1. It is a conjugate base of an imidazolium cation. It is a conjugate acid of an imidazolide. It is a tautomer of a 4H-imidazole. This ring system is present in important biological building blocks, such as histidine and the related hormone histamine.Formula: C10H20N2O4S
Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem