Main uses of maleic anhydride and domestic status

Maleic anhydride is mainly used in raw material unsaturated polyester resin (UPR) in the FRP industry; 1,4-butanediol (BDO), tetrahydrofuran (THF) and γ-butyrolactone (GBL) in hydrogenated products; Used in coatings, lubricant additives, pesticides, tartaric acid, succinic acid and anhydride, tetrahydrophthalic anhydride, modified rosin, etc. Unsaturated Polyester Resin (UPR): It is one of the main types of thermosetting resins. Due to its excellent mechanical properties, electrical properties and chemical corrosion resistance, and its easy processing, it is widely used. At present, China can produce more than 400 grades of UPR. The main varieties include o-benzene type, meta-benzene type, para-benzene type, bisphenol type A, etc., according to the use and function classification, including general-purpose resin, chemical-resistant resin, flame retardant resin, Casting resin, flexible resin, artificial marble, BMC and DMC resin, decorative resin and special resin. According to reports, in China's UPR market, the proportion of reinforcement (for FRP) resin is only 40%, while that of non-reinforced resin is as high as 60%, and that of non-reinforced resin is 34%, and button resin accounts for 34%. 24%, artificial marble accounted for 19%.

In 2003, the production of alkyd resin coatings and amino resin coatings was estimated at 750,000 tons, and the consumption of maleic anhydride was about 11,400 tons. It is expected that during the “Eleventh Five-Year Plan” period, alkyd resin coatings and amino resin coatings will continue to be the main varieties in the coatings industry. Energy-saving and low-pollution coatings such as water-based coatings, powder coatings and high-solids coatings will develop at a relatively fast speed. But the proportion will not change much. It is estimated that by 2009, the demand for coatings will reach about 3 million tons, of which alkyd resin coatings and amino resin coatings account for about 875,000 tons, and the corresponding maleic anhydride consumption is about 15,000 tons. According to reports, tartaric acid: tartaric acid is mainly used as a food sour agent, and its salts are used for mirror silver plating and metal treatment. In the textile industry, tartaric acid is also used in the tanning and telecommunications equipment industries.

In 2003, China's L-type and dl-type tartaric acid production capacity was estimated to be about 11,000 tons, the output was about 8,500 tons, and the consumption of maleic anhydride was about 7,900 tons. In recent years, L-type tartaric acid producers in the United States and Japan have shifted their investment to China, which has led to a rapid increase in the production capacity of domestic L-type tartaric acid products. At present, the annual production capacity of L-type tartaric acid in China has reached more than 10,000 tons, and the annual production capacity of dl-type tartaric acid products has reached about 20,000 tons. It is estimated that by 2009, the production capacity of L-type and dl-type tartaric acid products will reach about 40,000 tons, and it will consume about 38,000 tons of maleic anhydride.

Lubricating Oil Additives: PetroChina Lanzhou Refining & Chemical Company and Jinzhou Petrochemical Company are the two major lubricant additive manufacturing plants in China, with a production capacity of 70% of the national total. In addition, Dushanzi Refinery, Yumen Refinery and Wuxi, Shanghai, Dalian, Nanjing, Small factories in Yixian and Lanzhou also have certain output. At present, China's lubricant additive products mainly use ashless dispersants and metal detergents, accounting for 70% of the total consumption of lubricant additives. Only the production of ashless dispersants requires the consumption of maleic anhydride. In 2003, the output of China's ashless dispersant was about 35,000 tons, and the consumption of maleic anhydride was about 2,000 tons. It is estimated that by 2009, the demand for lubricant additives in China will reach 158,000 tons, of which the demand for dispersant is about 75,000 tons, and the consumption of maleic anhydride is about 5,000 tons.
Pesticides: Maleic anhydride is mainly used in pesticide production, including organophosphate insecticides such as malathion and dasong, and pyrethroid insecticides such as methrin. In 2003, China's pesticide production consumed about 3,000 tons of maleic anhydride, and it is estimated that the consumption in 2009 will be around 5,000 tons. Succinic acid and anhydride: Succinic acid (succinic acid) is mainly used in coatings, dyes, adhesives and pharmaceuticals. The alkyd resin produced from succinic acid has good flexibility, elasticity and water resistance; the diphenyl ester of succinic acid is an oil intermediate, which reacts with aminoguanidine to form an anthraquinone dye; succinic acid is available in the pharmaceutical industry. To produce sulfa drugs, vitamin A, vitamin B and hemostatic drugs; succinic acid is also widely used in the paper and textile industry, and can also be used as a raw material for lubricants, photographic chemicals and surfactants. In 2003, the output of succinic acid and anhydride in China was about 2,800 tons, and the consumption of maleic anhydride was 3,900 tons. It is estimated that the consumption in 2009 will reach 5,000 tons.

Tetrahydrophthalic anhydride: tetrahydrophthalic anhydride as an organic synthesis intermediate, can be used to prepare pesticides such as captan, captan, etc., and can also be used to prepare plasticizers, epoxy resin curing agents, unsaturated polyester resins, solvent-free paints and Adhesives, etc. In 2003, China's tetrahydrophthalic anhydride and methyltetrahydrophthalic anhydride had a capacity of about 2,500 tons, a production of about 2,000 tons, and a consumption of about 1,500 tons of maleic anhydride. It is estimated that the consumption in 2009 will reach 2,500 tons. According to reports, modified rosin: maleic anhydride is used in the rosin modification to produce maleic anhydride rosin ester and dispersed rosin latex. In 2003, China's modified rosin production was about 6,000 tons, and the consumption of maleic anhydride was about 2,400 tons. It is estimated that the consumption in 2009 will reach 5,000 tons. Chemical auxiliaries: Maleic anhydride is used in chemical auxiliaries to produce fast penetrant T and water quality stabilizer. In 2003, China's fast penetrant T capacity was about 8,000 tons, the output was about 5,000 tons, and the consumption of maleic anhydride was about 3,000 tons. In 2003, China The water quality stabilizer has a production capacity of about 11,000 tons, a production capacity of about 6,000 tons, and a consumption of about 1,000 tons of maleic anhydride.

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