Reforming C9 mainly contains meta-trimethylbenzene, methyl ethylbenzene, mesitylene and trimethylbenzene. It is a valuable resource for the development of fine chemicals and has a high added value. The use of reforming C9 aromatic hydrocarbons in China started relatively late. In the early 1980s, meta-trimethylbenzene with a purity greater than 98% was first isolated and isomerized with meta-trimethylbenzene to produce mesitylene. At present, some separation devices have been built in China, but in general, the utilization rate of C9 aromatics in China is still relatively low, and most of them are used as gasoline blending components, resulting in waste of resources.
Reforming C9 separation and utilization of main products: meta-trimethylbenzene, methyl ethylbenzene, mesitylene, high-boiling aromatic hydrocarbon solvent oil.
The trimellitic acid is oxidized to produce trimellitic acid, and then dehydrated to obtain trimellitic anhydride (TMA), which is referred to as meta-anhydride. The main downstream uses of partial anhydrides are (1) trioctyl trimellitate (TOTM); (2) synthetic polyamide-imide and polyester imide; (3) used as epoxy resin curing agent; (4) Synthetic alkyd resin: The partial acid anhydride reacts with the polyol and the dibasic acid to produce alkyd resin, polyester resin, polyurethane, amino alkyd resin coating with excellent performance; (5) production of powder coating and the like.
Dehydrogenation of methyl ethylbenzene to vinyl toluene is a monomer for producing polymethylstyrene (PPMS). PPMS is less dense than polystyrene (PS), has small volume shrinkage during polymerization, high heat resistance temperature, and is easy to shape and process. The elasticity, melt fluidity, transparency and the like of PPMS are higher than PS. At present, the market price of methyl styrene is 26,000-29000 yuan/t, and the product purity is ≥99.5%.
Mesitylene is an important organic chemical raw material. With mesitylene, various dye intermediates such as trimethylamine, trimesic acid and benzoic anhydride can be developed, such as 2,4,6-trimethylamine. Reactive Brilliant Blue, K-3R and other dyes can also be used to produce antioxidants, polyester resin curing agents, stabilizers, alkyd resin plasticizers, etc. Since mesitylene is a good solvent, it is flammable, irritating, and has a very low freezing point. In the electronics industry, it is used as a developer for silicone photosensitive sheets. The current market price is around 30,000 yuan / t.
High-boiling aromatic hydrocarbon solvent oil is mainly used as industrial solvent and paint thinner. It is close to xylene and has moderate volatility. It has strong dissolving power for various resins and is popular with paint manufacturers.
1. Vinyl toluene (VT) is a new type of polymerized monomer. It is mainly used in the synthesis of special coatings and adhesives. It has an irreplaceable role in the field of high-grade insulating varnish. It is widely used in aerospace, large-scale wind power, nuclear power and high-speed rail industries. It is new. A new star in the field of materials. In the domestic application has just started, the market price of 26000-29000 yuan / t, the benefits are very good.
2. Partial trimethylbenzene, trimellitic anhydride and trioctyl trimellitate. The current market price of trimellitic acid with purity ≥98.5 is 6,300 yuan/t. In 2015, the demand for trimellitic anhydride in the domestic plasticizer industry and powder coating industry is fast. Rising, the total demand exceeded 150,000 tons, and the current market price is around 15,000 yuan / t, the benefits are significant.
In the application of trimellitic anhydride in the plasticizer industry, TOTM (trioctyl trimellitate) is a non-toxic environmentally friendly plasticizer with high temperature resistance, anti-aging, corrosion resistance, migration resistance and excellent insulation properties. In the plasticizer industry has been fully affirmed and developed, especially the EU ROHS directive and REACH regulations to improve environmental standards, affirmed that TOTM in the plasticizer industry will gradually replace the currently used dioctyl phthalate (DOP) ). Due to the harmful effects of DOP plasticizers on the human body, EU regulations have explicitly restricted the use of phthalate plasticizers in PVC products.
At present, environmentally-friendly plasticizers in Europe and the United States account for 80%, while in China, the proportion is less than 20%. According to relevant statistics, in 2010 China's DOP production capacity was 2 million tons / year, and maintained a 3% annual growth. The TOTM domestic market demand is around 80,000 tons, and the consumption of trimellitic anhydride is about 28,000 tons. With the continuous improvement of people's awareness of environmental protection and safety, the demand of TOTM in China's market will increase dramatically, and the proportion of plasticizer will increase rapidly, which will bring new development opportunities to trimellitic anhydride, 2015 The annual demand for trimellitic anhydride in the plasticizer industry will reach 90,000 tons.
The application of trimellitic anhydride in the powder coating industry is also growing, especially for environmentally friendly and excellent powder coatings. The statistics of the Powder Coatings Association show that the domestic powder coating production capacity is growing rapidly, reaching 1.7 million tons/year in 2015, of which mixed type The production capacity of polyester resin powder coatings is 850,000 tons/year. The development of powder coatings has driven the rapid growth of the market demand for trimellitic anhydride. It is expected to consume about 42,000 tons of trimellitic anhydride.
In addition, polyamide-imide and polyesterimide can be used not only as insulating materials, but also in the manufacture of molded plastic parts such as electrical components, valve parts, and jet engine parts. Currently, about 18,000 trimellitic anhydride is consumed in this field in China. Ton.
3. Mesitylene is an important organic chemical raw material. Various dye intermediates such as trimethylamine, trimesic acid and benzoic anhydride can be developed by using mesitylene, such as 2,4,6-trimethylamine. For the production of reactive brilliant blue, K-3R and other dyes, can also be used to produce antioxidants, polyester resin curing agents, stabilizers, alkyd resin plasticizers. Since mesitylene is a good solvent, it is flammable, irritating, and has a very low freezing point. In the electronics industry, it is used as a developer for silicone photosensitive sheets. The current market price is 30,000 yuan / t, the benefits are very good.
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