A few days ago, a 1,000 tonne/year urea indirect method for the production of dimethyl carbonate (DMC) pilot plant jointly developed by the Shanxi Institute of Coal Chemistry of the Chinese Academy of Sciences and Shanghai Weifu Chemical Technology Development Co., Ltd. was drove at the Salt Lake Group of Qinghai, Golmud, Qinghai Province. Successfully produced a DMC product with a purity of 99.8 wt%.

The 500-hour run showed that the first step was the reaction of urea with 1,2-propanediol to prepare propylene carbonate (PC). The urea conversion rate reached 100%, and the PC yield was stable at more than 95%. Step 2 PC and methanol esters In the reaction for the exchange of DMC, the PC conversion rate was 100%, the DMC selectivity was greater than 99%, and the DMC outlet concentration at the top of the reaction tower was stable at 30 wt% or more. The recycling of the 1,2-propanediol produced by the second transesterification does not have any adverse effect on the reaction of the first step when used as a raw material for the first step reaction.

As a green, non-toxic chemical, DMC is known as the "new base" for organic synthesis. Can be used as a solvent, lithium-ion battery electrolyte, gasoline and diesel fuel additives, and in many areas to fully replace the highly toxic phosgene, dimethyl sulfate and methyl chloroformate, etc. to produce a series of important chemicals, such as polycarbonate, isocyanate , pharmaceuticals, pesticides, fine specialty chemicals, etc., have broad market application prospects (the domestic market is expected to be around 4.3 million tons/year).

The urea indirect method produces dimethyl carbonate with urea and methanol as raw materials, which have serious overcapacity and low price. It has the advantages of mild reaction conditions, high product yield, easy recovery of ammonia, simple subsequent separation, low energy consumption, and low cost. Compared with other production process routes, it has strong economic competitiveness. Based on this technology, a 50,000 tons/year urea indirect method can be used to produce dimethyl carbonate.

At present, two national invention patents have been applied for around this technology.

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