Views: 2 Author: Site Editor Publish Time: 2022-04-01 Origin: Site
The most important thing is the price. I looked at the price of dimethyl carbonate on the Internet. Recently, the price rose all the way up to 12,000 yuan/ton. Even at the lowest end of the market, the price of dimethyl carbonate is hardly sufficient for the use of gasoline additives. Most of the propylene oxide required by domestic existing production enterprises is purchased from outside (self-produced propylene is also purchased from outside).
Zhejiang Petrochemical Co., LTD. 's dimethyl carbonate plant is one of the joint plants, ethylene direct oxidation route can ensure a continuous supply of ethylene oxide raw materials and low cost (propylene oxide and ethylene oxide prices are 18,000 yuan and 7,200 yuan/ton respectively). Once the market returns to normal years, the price of dimethyl carbonate will fall with the rapid increase in market volume, making replacement possible.
Another advantage of ethylene oxide ester exchange production is that the glycol market is good.Propylene glycol produced by propylene oxide route has been limited by small market capacity and difficult market development, and often appears to be bought at a loss. The two products can also be "lame", with both good and bad, even using propylene glycol as a by-product of dimethyl carbonate production. According to the news, the ethylene glycol products reached the main content of 99.9% or more of the national standard polyester grade. Therefore, glycol produced by the dimethyl carbonate process will be very competitive with the daily demand for glycol. Ethylene oxide and carbon dioxide production of vinyl carbonate, for large-scale transesterification method of production of polycarbonate supporting enterprises to provide a mature technical basis.
With the maturity and adoption of non-phosgene production polycarbonate process, the demand for vinyl carbonate will be tens of thousands of tons (there have been data show that using non-phosgene transesterification process, the production of 1 T PC needs to consume 0.35 T DMC equivalent). According to reports, this process in addition to large capacity, there are three technological breakthroughs, including innovation of green homogeneous ionic liquid synthesis catalyst, making the reaction conditions more mild, conversion and yield greatly improved; The injection reactor was used to solve the risk of large amount of ethylene oxide entering the reaction system. The separation system of vinyl carbonate was innovated to solve the separation problem caused by the easy decomposition of vinyl carbonate.
Therefore, the successful operation of the unit will ease the domestic demand for vinyl carbonate products, provide a polyester grade glycol production route with less investment and low cost for large oil refining enterprises with ethylene oxide and carbon dioxide, and provide a mature technical basis for large-scale transesterification production of polycarbonate supporting enterprises.