Project introduction:

Dimethyl carbonate (DMC for short) is an environmentally friendly green chemical product that has attracted widespread attention at home and abroad in recent years. It has good reactivity and can replace phosgene, dimethyl sulfate, methyl chloride and methyl chloroformate in many fields. Toxic or carcinogens undergo reactions such as chelation, methylation, methylation and transesterification to produce a variety of important chemical products. There are three main synthetic processes for dimethyl carbonate: phosgene method, methanol oxidation and transesterification method. Due to the use of highly toxic phosgene, the phosgene method has poor product quality and limited application. The use of phosgene itself is also limited. It has been gradually eliminated. The latter two methods are the main production methods of DMC at present. The production of dimethyl carbonate in my country is mainly based on transesterification. There are a large number of reaction and atmospheric and pressurized rectification towers in the transesterification process. These towers consume high energy and consume a large amount of steam every year. As domestic energy prices increase year by year, product production costs increase rapidly, which pose a serious threat to the product's profit margins. This project is a proprietary patented technology. The project is developed on the basis of traditional transesterification synthesis and azeotropic rectification and separation processes, combined with heat pump and pinch point technology. This technology carries out comprehensive energy matching and optimization of existing production processes, and carries out energy-saving transformation of reactive rectification towers and other equipment with large energy consumption. After pressurizing and heating, the vapor at the top of the tower is directly used as the heat source for the tower bottom reboiler. There is no need for a tower top condenser and its cooling water consumption, and there is no need to use a boiler to heat the tower bottom reboiler. After adopting the technical transformation of the traditional process with this project, the energy in the core process section can be self-produced and sold, which greatly reduces the consumption of steam, and also reduces the consumption of cooling water, and greatly reduces the production cost.

The main technological innovation and leadership of this project are:

① The project technology has independent intellectual property rights and good barriers to technical implementation;

② We have good engineering practical experience and are currently undergoing the transformation of a 10,000-ton pilot production plant. The pilot plant with an annual output of 50,000 tons of anhydrous ethanol using related technology has been operating well for nearly two years.

③ In conjunction with relevant construction units and intellectual property sharing units, have overall turnkey capabilities for engineering design, transformation and construction.

Application prospects and fields:

Dimethyl carbonate has unique chemical properties, non-toxic, and low pollution. It can be widely used in organic synthesis, gasoline additives, solvents, medicines, pesticides and other fields. In recent years, market demand has grown rapidly. At present, there is a shortage of products in the domestic dimethyl carbonate market, and production profits are considerable. Many manufacturers have continued to expand their production scale in recent years. However, with the adjustment of my country's energy structure and the increase in the prices of kerosene and other energy, the problem of how to reduce the energy consumption of the production of dimethyl carbonate by transesterification has become increasingly prominent. The patented process of this project can effectively reduce energy consumption costs. Taking the 10,000-ton process as an example, only after the reaction rectification tower is energy-saving transformation, the annual steam consumption can be reduced by about 60,000 tons. The new electricity consumption after the energy-saving transformation is eliminated. The annual energy saving cost is about 10 million yuan. If the entire process is recycled and comprehensively utilized, the energy saving potential will be greater.

Taking the process with an annual output of 10,000 tons as an example, by transforming the reaction rectification column, the total investment in the project transformation is about 5 million yuan. The transformation cost can be recovered in half a year, and the annual energy consumption cost is about 10 million yuan. Cooperation methods: technology transfer, technology entrusted (cooperative) development, technology licensing, technology equity participation. The partner is a chemical company that produces DMC through ester exchange.