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The ethylene glycol project of Weihua Group produces dimethyl oxalate. Author/Source: Weihua Group. Date: 2021-02-09. Clicks: 18. At 3:30 a.m. on February 5, the one-time feeding process for the carbonylation of ethylene glycol at the Binzhou plant was successful, resulting in the production of dimethyl oxalate; this represents another significant step forward in the production of polyester-grade ethylene glycol. This system utilizes the \"nitrite process\" technology developed in Ube, Japan. Methyl nitrite is highly explosive and highly toxic, making it difficult to handle during production while also requiring high precision in operations. Dimethyl oxalate has a melting point of 54°C; it is in a solid state at room temperature, and it needs to be kept in a liquid state during production. Faced with the challenges of multiple processing stages and complex operations associated with the new process, the ethylene glycol workshop laid a solid foundation through thorough training and examinations in the initial stage, ensuring that everyone had a deep understanding of the process and was well-versed in all the key operational details, thus providing a strong guarantee for smooth production. Taking proactive measures to ensure success, during the project construction phase, the responsible persons in the ethylene glycol workshop oversaw everything, carrying out the construction work in a meticulous, thorough, and rigorous manner. No detail is overlooked, from pipeline installation, purging, and replacement to insulation and heat tracing. During the commissioning phase, safety must be ensured and progress facilitated; thorough preparations should be made in advance. As soon as the gas from the previous stage is ready, production can begin in the ethylene glycol system, thereby reducing the costs associated with starting up the operation step by step. At 3 p.m. on February 4, upon receiving the notification that the gas production workshop had produced 99.9% pure carbon monoxide, the ethylene glycol workshop promptly organized its staff to introduce this carbon monoxide into the system in order to initiate the carbonylation synthesis process. To surprise the company on the Lesser New Year, dimethyl oxalate was produced.