Every year, China’s huge industrial emissions have finally found an effective way out. The recycling and utilization of industrial vent gas ethylene glycol technology developed by the Southwest Research and Design Institute not only created a new raw material route for glycol production, making the exhaust gas resources recycled, but also eliminating the need for complex coal gasification equipment and processes. The overall investment in project construction will be reduced by 30%. On December 1st, this technical achievement was identified in Chengdu by experts from Sichuan Science and Technology Department. Experts believe that the results of eliminating pollution, saving resources, and lowering investment "three-in-one" have already met the industrialization conditions, and the industry has broad prospects for promotion.

Experts believe that the technological achievements have three innovative features: First, the development of a palladium-based carbonylation catalyst and a copper-based hydrogenation catalyst with two core catalysts of industrial application value, in the condition of maintaining the conversion rate of 100% and the selectivity of 90%. Next, it successfully passed the assessment of over 6,000 hours of long-term operation; the second was the expansion of industrial emissions as a source of raw gas, and coalbed methane, coke oven gas, yellow phosphorus tail gas, and calcium carbide furnace gas all can be used as raw materials to further reduce production. The cost is more than 20%; the third is the development of the diethyl oxalate process route and carbon monoxide purification and purification technology, two-bed esterification reactor and process, carbon monoxide coupling-regeneration reaction steady-state cycle, hydrogenation reactor, polyester grade The five key process technologies such as the refinement of ethylene glycol products have integrated low-energy and low-cost process technologies. Currently, 5 national invention patents have been declared and 4 have been authorized.

Experts estimated that if the production cost of ethylene glycol (oil at a price of US$75/barrel) is 7,500 yuan/ton for petroleum routes and the cost of coal-based glycol is 5,000 yuan/ton, industrial exhaust gas such as yellow phosphor tail gas or calcium carbide furnace tail gas is used. The cost of producing ethylene glycol is 4000 yuan/ton. Compared with other technologies in the field of coal glycol, the use of industrial exhaust gas to reduce the consumption of methanol per ton of methanol products 0.16 tons, saving steam consumption 2.5 tons.

From the investment point of view, a set of 100,000 tons/year of carbon monoxide extracted from yellow phosphorus tail gas and oxalic acid ester ethylene glycol industrial plant will be built. The project investment is about 800 million yuan, and annual sales income of 1 billion yuan can be realized. 400 million yuan. According to the analysis of environmental benefits, domestically producing 1 million tons of yellow phosphorus per year, with an average of 1.5 grams of phosphorus per standard cubic yellow phosphorus tail gas, 3 grams of sulfide, 0.08 grams of arsenide, and 0.5 grams of fluoride, 3750 tons of phosphorus can be reduced annually. Chemicals, 7,500 tons of sulfide, 200 tons of arsenide and 1,250 tons of fluoride.

It is understood that there are currently 12 ethylene glycol manufacturers in China, most of which are ethylene ethylene glycol lines. By the end of this year, the nation’s ethylene glycol production capacity will reach 4.5 million tons, and the consumption will reach 8 million tons. If the supply and demand gap of nearly 4 million tons is replaced by industrial emissions as raw materials, foreign exchange can save more than US$3 billion a year, while reducing More than 200 million tons of ethylene are consumed.

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The annual emissions of CBM, coke oven gas, converter gas, blast furnace gas, yellow phosphorus tail gas, calcium carbide furnace gas, and refinery gas in China's chemical, petroleum, coal, and metallurgical industries are absolutely alarming, although they have no accurate statistics. The use of carbon monoxide and other resources in these industrial emissions for the carbonylation and hydrogenation of ethylene glycol can create significant economic and social benefits.

Southwest Chemicals Institute took the lead in the study of syngas glycol technology in China since 1986, and undertook the “Eleventh Five-Year Plan” national science and technology support plan key project “Development of Key Technologies for Preparation of Bulk Chemicals from Non-Petroleum Routes”. After scientific and technical personnel continued to innovate, the Southwest Academy has integrated and developed the key catalysts and supporting technologies for the process, and has successfully completed the pilot test, model test, pilot test, and large-scale industrial industrial ethylene glycol project. Development of process software packages.

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