Dimethyl carbonate area

The preparation method of dimethyl carbonate is: 1. The process of producing dimethyl carbonate by alcoholysis of urea. The urea solution and methanol enter the reaction section of the reactive distillation tower in countercurrent at a molar ratio of 8-12:1, and undergo a contact reaction. Under the action of a catalyst, a crude dimethyl carbonate solution is generated. The crude dimethyl carbonate solution is distilled under normal pressure, pressurized distillation, and then distilled under normal pressure. After rectification, the product 99.5% dimethyl carbonate is refined. ； During the reaction process, a by-product ammonia gas is generated, which becomes 17% ammonia water after being absorbed by desalted water, which is used as a raw material for synthesizing urea. Effect: Thermal coupling process is adopted, and the gas phase extracted from the top of the pressurized tower is used as the heat source of the column kettle of the atmospheric concentration tower, which reduces the consumption of steam and circulating water in the device and saves energy. ； Separation of azeotropes without adding entrainer. A reactive distillation tower is used to synthesize dimethyl carbonate from urea and methanol. The conversion rate is high, the production process is safe, easy to control, and easy to operate. The production process is simpler and there is no emission of three wastes. 2. Methanol liquid-phase oxidation carbonyl synthesis of dimethyl carbonate. This project was approved by Hubei Xingfa Chemical Industry Group * * Appraisal and acceptance. * * The appraisal and acceptance committee believes that this complete set of process technology is the first of its kind in China, and its technical level has reached the international advanced level, providing a basis for the construction of 10,000-ton industrial production equipment.

Your section is too deserted. I want to know about the downstream products of dimethyl carbonate.

Who knows if there is any breakthrough in the methanol vapor phase carbonylation process in China? catalyst * Metal Pd-K/C. Now it seems that only Japan is industrialized in the world.

What is the current state of the technology for direct synthesis of dimethyl carbonate from methanol? Looking forward to good news!