On January 4, the PP unit at Datang Duolun Coal Chemical Industry was shut down – what was the reason?

I went there a few years ago; only one production line was in operation, the amount of methanol available was insufficient, so it had to be purchased from outside

Devices that use methanol are subject to restrictions from time to time

It’s been under maintenance recently. It's a world of ice and snow.

The startup of the upstream MTP unit was not successful

You got it backwards. It’s the unsuccessful startup of the equipment upstream of the MTP unit.

The Datang Dolun coal-to-olefins project is set to resume operations in April. Author/Source: Date: 2017-03-06. Clicks: 19. On March 2, Gao Yanmin, a member of the Party leadership group in Dolun County, Inner Mongolia, and deputy director of the office in charge of the Datang International Dolun coal chemical project, led representatives from various departments including those responsible for industrial parks, environmental protection, safety supervision, economy and information technology, as well as food and drug supervision, to hold in-depth discussions with Zhao Zongkai, general manager of Datang Dolun Coal Chemical, and other team members regarding issues such as safety measures, environmental protection, inspections of special equipment, and fire safety before resuming production, in order to find solutions and enable the plant to start operating again as soon as possible. It is reported that, in accordance with the commissioning plan and taking into account the actual ambient temperature, Datang Duolun Coal Chemical started constructing various steam pipelines on February 15, simultaneously activating the heat tracing systems for the utility pipelines; by the end of February, stable pipelines for steam, desalinated water, and boiler water were established. At the beginning of March, an air separation unit was put into operation to supply gas for testing purposes in various facilities, and one additional boiler was installed ； During the same period, individual trial operations for each large-scale unit will be carried out, and the second air separation unit will be started at an appropriate time depending on the specific circumstances. It is planned to complete all the preparatory work prior to commissioning of each chemical production unit by March 28, including airtightness testing, purging, system feeding, and monomer trial runs. After the completion of the technical upgrades to the power desulfurization system, the No. 2 desulfurization system as well as the remaining boilers were brought online at the beginning of April, and the third air separation unit was started up. In early April, the gasification unit was fed with materials to produce methanol, as well as polypropylene at the appropriate time. In June 2016, Datang Inner Mongolia Dolun Coal Chemical Co., Ltd. was ordered by Datang International to suspend operations due to illegal discharge of wastewater, and it carried out comprehensive environmental protection measures. On August 14, 2016, an explosion occurred in the methanol tank at Datang Dolun Coal Chemical Industry. Based on on-site investigations, it is preliminarily determined that the accident occurred during the company’s shutdown for maintenance; while external contractors were working in the methanol tank area, they failed to follow the operating procedures, which led to an explosion in one of the methanol tanks. As a result, one person died, one person went missing, and one person was injured.