——Professor Zhang Weijiang from the School of Chemical Engineering of Tianjin University talks about the development of high value-added methanol downstream products At present, China’s methanol production has grown rapidly. The development and production of methanol downstream products become the main direction of methanol digestion, and high-purity methanol can be the focus. On March 14th, in response to this new situation in the industry, Zhang Weijiang, a professor of Tianjin University’s School of Chemical Engineering who had developed chromatographic grade high-purity methanol and had earlier engaged in high-purity methanol research in China, was interviewed by the reporter.
Market gap production is still blank The high-purity methanol prepared by industrial-grade methanol purification is used as a good solvent for organic chemicals. It can also be used to produce formic acid, acetic acid, methyl chloride, methylamine, methyl tert-butyl ether, and Dimethyl phthalate, methyl acrylate, and a series of other high-purity organic chemical products are extremely valuable for market development.
Zhang Weijiang stated that with the rapid expansion of the education and scientific research industry, the number of large-scale precision instruments and equipment has increased sharply, and the high-speed development of micro-electronics and other high-tech industries has also brought about a rapid increase in the use of high-purity methanol. The demand for high-purity methanol in the domestic market has grown rapidly, and the gap is also large. Especially for high-purity products, domestic companies cannot produce, and market demand can only rely on imports. Therefore, high purity methanol needs to be developed.
High-purity methanol has high added value, and the market price is at least 8,000 yuan to 10,000 yuan per ton, which is more than three times that of industrial methanol. However, the production technology of high purity methanol is still a problem in China. The mature industrialization technology is currently monopolized by several European and American well-known chemical companies. Taking the Sichuan market as an example, the annual demand is 400 tons, all of which are produced by foreign companies.
High technological requirements Development should be suitable for the national conditions Professor Zhang Weijiang introduced that the preparation of high-purity methanol can be basically divided into two categories.
One is the direct synthesis of high-purity raw gas, which requires a clean reaction environment, equipment, and strict reaction conditions. In order to remove the impurities in the methanol vapor, a catalyst containing a high purity manganese oxide as a main component is required, and a high-purity gas such as nitrogen, hydrogen, or argon is also required as an oxidation protection gas. This method is very demanding on the production process conditions.
The other method is the purification of industrial methanol to purify high-purity methanol. It is also an area that should be developed in China. At present, China's methanol production is developing rapidly and has abundant methanol raw materials. Therefore, this method is very suitable for China's national conditions. Production of high-purity methanol products by this process is the most practical and most reasonable development method in China.
The impurities in industrial methanol include organic substances such as alcohols, aldehydes, ketones, ethers, esters, and alkanes, as well as ions, water, and other three categories, while the high-purity methanol requires extremely high impurities, and its product detection items are generally 30 to 40 items, and most of the project indicators required to reach 1 × 10-9. Common methods for removing impurities in solution include organic distillation, chemical purification, reactive distillation, and extractive distillation. Metal ions and acid ions can be removed by subambient distillation, ion exchange resin purification, and the like. The method for purifying water is chemical. Purification, pervaporation membrane purification.
Cracking the technical bottleneck The joint production, learning and research of Professor Zhang Weijiang told reporters that the production of high-purity methanol is a systematic project that includes not only separation and purification, but also packaging. If the packaging fails to meet the requirements, the quality of the product is not qualified. Many well-known foreign companies adopt multi-stage distillation, adsorption, and sub-boiler distillation and other advanced processes, and realize integrated operation of continuous production, testing, and filling. Product quality is stable, production and inspection processes are strict, operation flexibility is high, and indicators can be adjusted according to different requirements of users. The cost is relatively low. Its production scale can reach 10,000 tons.
The existing high-purity methanol preparation technology in our country is still relatively backward, and chemical treatment and distillation processes are often used. The technical standards of products are confusing. A very small number of products can only approach the standard of low purity chromatographic products of well-known foreign companies. There is still a large gap between the imported high-purity methanol products and the indicators cannot meet the high-end requirements. At the same time, there are still problems such as small scale of production, unstable product quality, and electronic-level production technology.
Zhang Weijiang called for a better situation in the current industrial methanol market. Manufacturers should look to the long-term and work with universities to develop a new and effective high-purity methanol production process that suits China's national conditions, filling China's high purity reagent production technology. The lack of. At the same time, the development of high-purity methanol can also provide strong support for the development of China's electronic chemicals, precision instruments, pharmaceuticals, biochemistry and other industries.
Market gap production is still blank The high-purity methanol prepared by industrial-grade methanol purification is used as a good solvent for organic chemicals. It can also be used to produce formic acid, acetic acid, methyl chloride, methylamine, methyl tert-butyl ether, and Dimethyl phthalate, methyl acrylate, and a series of other high-purity organic chemical products are extremely valuable for market development.
Zhang Weijiang stated that with the rapid expansion of the education and scientific research industry, the number of large-scale precision instruments and equipment has increased sharply, and the high-speed development of micro-electronics and other high-tech industries has also brought about a rapid increase in the use of high-purity methanol. The demand for high-purity methanol in the domestic market has grown rapidly, and the gap is also large. Especially for high-purity products, domestic companies cannot produce, and market demand can only rely on imports. Therefore, high purity methanol needs to be developed.
High-purity methanol has high added value, and the market price is at least 8,000 yuan to 10,000 yuan per ton, which is more than three times that of industrial methanol. However, the production technology of high purity methanol is still a problem in China. The mature industrialization technology is currently monopolized by several European and American well-known chemical companies. Taking the Sichuan market as an example, the annual demand is 400 tons, all of which are produced by foreign companies.
High technological requirements Development should be suitable for the national conditions Professor Zhang Weijiang introduced that the preparation of high-purity methanol can be basically divided into two categories.
One is the direct synthesis of high-purity raw gas, which requires a clean reaction environment, equipment, and strict reaction conditions. In order to remove the impurities in the methanol vapor, a catalyst containing a high purity manganese oxide as a main component is required, and a high-purity gas such as nitrogen, hydrogen, or argon is also required as an oxidation protection gas. This method is very demanding on the production process conditions.
The other method is the purification of industrial methanol to purify high-purity methanol. It is also an area that should be developed in China. At present, China's methanol production is developing rapidly and has abundant methanol raw materials. Therefore, this method is very suitable for China's national conditions. Production of high-purity methanol products by this process is the most practical and most reasonable development method in China.
The impurities in industrial methanol include organic substances such as alcohols, aldehydes, ketones, ethers, esters, and alkanes, as well as ions, water, and other three categories, while the high-purity methanol requires extremely high impurities, and its product detection items are generally 30 to 40 items, and most of the project indicators required to reach 1 × 10-9. Common methods for removing impurities in solution include organic distillation, chemical purification, reactive distillation, and extractive distillation. Metal ions and acid ions can be removed by subambient distillation, ion exchange resin purification, and the like. The method for purifying water is chemical. Purification, pervaporation membrane purification.
Cracking the technical bottleneck The joint production, learning and research of Professor Zhang Weijiang told reporters that the production of high-purity methanol is a systematic project that includes not only separation and purification, but also packaging. If the packaging fails to meet the requirements, the quality of the product is not qualified. Many well-known foreign companies adopt multi-stage distillation, adsorption, and sub-boiler distillation and other advanced processes, and realize integrated operation of continuous production, testing, and filling. Product quality is stable, production and inspection processes are strict, operation flexibility is high, and indicators can be adjusted according to different requirements of users. The cost is relatively low. Its production scale can reach 10,000 tons.
The existing high-purity methanol preparation technology in our country is still relatively backward, and chemical treatment and distillation processes are often used. The technical standards of products are confusing. A very small number of products can only approach the standard of low purity chromatographic products of well-known foreign companies. There is still a large gap between the imported high-purity methanol products and the indicators cannot meet the high-end requirements. At the same time, there are still problems such as small scale of production, unstable product quality, and electronic-level production technology.
Zhang Weijiang called for a better situation in the current industrial methanol market. Manufacturers should look to the long-term and work with universities to develop a new and effective high-purity methanol production process that suits China's national conditions, filling China's high purity reagent production technology. The lack of. At the same time, the development of high-purity methanol can also provide strong support for the development of China's electronic chemicals, precision instruments, pharmaceuticals, biochemistry and other industries.
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