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Upstream product

• 288-32-4 1H-imidazole 
• 65039-08-9 3-ethyl-1-methyl-1H-imidazol-3-ium bromide 

Relevant academic research and scientific papers

Three different types of heterocycle of nitrogen-containing alkaline ionic liquids treatment of acid oil to remove naphthenic acids

Ionic liquids had enormous potential for industrial use as environmental friendly chemicals. A green and effective deacidification method was found based on ionic liquids. N-alkylpyridinium bromide ([APy]Br), 1-alkyl-3- methylimidazolium bromide ([AMIm]Br) and 1-alkyl-3-methylimidazolium imidazolide ([AMIm]Im) were used to remove naphthenic acids from acid oil. The performance of deacidification followed the order [APy]Br [AMIm]Br [AMIm]Im. The stronger alkalinity of ionic liquids was, the higher deacidification would be. The growth of alkyl chain length was also beneficial to get high deacidification. The deacidification mechanism was that liquid clathrate could form due to interaction between the ionic liquids and π-bond in naphthenic acids through π-π interaction. When the reagent/oil ratio of [OMIm]Im (1-octyl-3-methylimidazolium imidazolide)/oil was 0.008, the deacidification rate could be reached 100%. The preliminary results reveal that the process consumes less energy, saves time and produces less pollution to environment.

Preparation method of dimethyl carbonate

The invention discloses a dimethyl carbonate preparation method, which comprises: contacting a raw material containing ethylene carbonate and methanol with a catalyst, and carrying out reaction to obtain dimethyl carbonate, wherein the catalyst comprises an ionic liquid; the ionic liquid comprises anions and cations; the cation has a structure as shown in a formula I or a formula II. According tothe preparation method of dimethyl carbonate, a series of developed strongly basic ionic liquids are used for ester exchange reaction of ethylene carbonate and methanol to synthesize dimethyl carbonate and ethylene glycol, extremely high reaction activity is achieved, reaction equilibrium can be achieved after reaction for 5 min at 68-70 DEG C even if the content of the catalyst is 0.3wt%, and certain catalytic activity is achieved even at 0 DEG C.

Solvent-free aza-Markovnikov and aza-Michael additions promoted by a catalytic amount of imidazolide basic ionic liquids

A family of imidazolide ionic liquids were synthesized and characterized. These ionic liquids combined the virtues of strong basicity and relatively good thermal stability. Catalytic properties of these imidazolide ionic liquids were investigated and satisfactory yield was achieved when 2.0 mol % of [Bmim]Im was used as catalyst for aza-Markovnikov addition under solvent-free condition at room temperature in one hour. Experimental results show that a hydrogen bond is not formed between [Bmim]Im/imidazole and vinyl ester, and its existence is not necessary for the [Bmim]Im catalyzed aza-Markovnikov addition either. A possible mechanism for [Bmim]Im-catalyzed aza-Markovnikov addition was proposed. The use of imidazolide ionic liquids in aza-Michael addition was investigated as well.