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Experts believe that the technical 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, 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; second, it expanded the industrial emission gas as the source of raw gas, and coalbed methane, coke oven gas, yellow phosphorus tail gas, calcium carbide furnace gas, etc. can all 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-stage esterification reactor and process, carbon monoxide coupling-regeneration reaction steady-state cycle, hydrogenation reactor, polyester grade The five key process technologies such as ethylene glycol product refinement 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, then 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 make ethylene glycol to save 0.16 tons of methanol per ton product, saving steam consumption 2.5 tons.
From an investment point of view, a 100,000-ton-per-year industrial plant for the extraction of carbon monoxide from oxalic acid tail gas and oxalic acid ester to ethylene glycol was built. The project investment is about 800 million yuan, and annual sales income of 1 billion yuan can be realized. 400 million yuan. From the analysis of environmental benefits, domestically produced 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 sulfides, 0.08 grams of arsenide, and 0.5 grams of fluoride, and 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, annual foreign exchange savings of more than US$3 billion can be saved, while reducing More than 2 million tons of ethylene are consumed.
News links China's chemical, petroleum, coal, metallurgical and other industries annually emit CBM, coke oven gas, converter gas, blast furnace gas, yellow phosphorus tail gas, calcium carbide furnace gas, and refinery gas. Although there is no accurate statistics, the number is absolutely alarming. 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 Routesâ€. 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 completed the pilot test, model test, pilot test and large-scale industrial industrial ethylene glycol project. Development of process software packages.
Industrial emissions of ethylene glycol technology has made significant progress
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 eliminated 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 conditions for industrialization and the industry has broad prospects for promotion.