China National Petroleum Corporation and China Global have applied for patents related to synthetic ammonia control. The synthetic ammonia control system can regulate the nitrogen gas input based on flow rate.

March 30, according to information from the National Intellectual Property Administration, China National Petroleum Corporation Limited and China Huanqiu Contracting & Engineering Corporation Limited have applied for a patent titled “Ammonia Synthesis Control System and Method.” The publication number is CN121717379A, the application number is CN202511603309.4, the publication date is March 24, 2026, the application date is November 4, 2025. The inventors are Tang Shuo, Chen Shengbin, Wu Yan, Ma Mingyan, Wang Yong, Sun Changgen, Fan Jiquan, Zhao Hongxia, and Chang Liang. The patent agency is Beijing Tongli Juncheng Intellectual Property Agency Co., Ltd., and the patent attorneys are He Zhaowei and Huang Jian. The classification number is C01C1/04.

The patent abstract shows that this application provides an ammonia synthesis control system and method, relating to the field of energy chemical engineering technology. The system includes: an electrolytic water hydrogen production unit, a nitrogen production unit, a synthesis gas storage unit, a first compressor, an ammonia synthesis unit, a flow detection device, and a control device; the electrolytic water hydrogen production unit, the first compressor, and the ammonia synthesis unit are connected in sequence by pipelines; the nitrogen production unit is connected respectively to the pipeline of the electrolytic water hydrogen production unit and the pipeline of the first compressor; the outlet of the first compressor is connected to the inlet of the synthesis gas storage unit; the outlet of the synthesis gas storage unit is connected to the inlet of the first compressor; the flow detection device is communicatively connected with the electrolytic water hydrogen production unit, the first compressor, the synthesis gas storage unit, and the ammonia synthesis unit; the control device is configured to obtain real-time flow detection results of the flow detection device, determine the nitrogen injection amount of the nitrogen passing into the first pipeline route and the second pipeline route based on the real-time flow detection results, and control the first pipeline route and the second pipeline route to inject according to the corresponding nitrogen injection amount.

China National Petroleum Corporation Limited was established on November 5, 1999, and was listed on the Shanghai Stock Exchange on November 5, 2007. Its registered address is in Beijing, and its office address is in Beijing and Hong Kong. It is the largest oil and gas producer and marketer that dominates the domestic oil and gas industry, with business covering the entire industrial chain such as oil and gas exploration and development, refining and petrochemicals, and so on.

The main businesses of China National Petroleum Corporation include exploration, development, production, transportation, and sales of crude oil and natural gas, as well as new energy business; refining of crude oil and petroleum products, production and sales of chemical products, and new materials business; sales and trading of refining products and non-oil products; and transportation and sales of natural gas. The Shenwan industry to which it belongs is Oil and Gas - Refining and Trading - Refining and Petrochemicals, and the concept sector to which it belongs includes mainly polyethylenes, Sinopec-related, and the oil-to-chemicals concept.

In 2025, China National Petroleum’s operating revenue reached 28644.69 billion yuan, ranking No. 1 among the 5 companies in the industry, far exceeding the industry average of 11463.27 billion yuan and the median of 755.63 billion yuan, and higher than second-placed Sinopec of 27835.83 billion yuan. In terms of the composition of main business, refining products account for 68.87%, natural gas accounts for 42.66%, and so on. As for net profit, in 2025 it was 1720.05 billion yuan, also ranking No. 1 in the industry, higher than the industry average of 411.65 billion yuan and the median of 1205.68 million yuan, far above second-placed Sinopec’s 352.5 billion yuan.

The recent patent situation of China National Petroleum Corporation Limited is as follows:

According to data from Tianyancha, China Huanqiu Contracting & Engineering Corporation Limited was established on March 16, 1992. The legal representative is Li Xiaoning. Its industry is construction and installation, with an enterprise scale of large. Registered capital is 148016.570141 million yuan RMB, paid-in capital is 148016.570141 million yuan RMB. The registered address is No. 1, Chuangda Second Road, Chaoyang District, Beijing. China Huanqiu Contracting & Engineering Corporation Limited has invested in 19 external companies, participated in 10108 bidding and tendering projects. In terms of property-related leads, there are 24 trademark information entries, 947 patent information entries, and it holds 51 administrative licenses.

The recent patent situation of China Huanqiu Contracting & Engineering Corporation Limited is as follows:

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