project introduction
Para-hydroxybenzaldehyde.
Presentations. Para-hydroxybenzaldehyde is a very important organic intermediate, which is widely used in many fields such as spices, daily chemicals, food additives, pharmaceuticals, photoresists, liquid crystal materials, pesticides, dyes, printing and dyeing and electroplating.
At present, the total demand for para-hydroxybenzaldehyde is 2It is about 20,000 tons per year, and the market value is more than 1 billion yuan per year.
The total production capacity of p-hydroxybenzaldehyde plants that have been completed, put into operation and under construction in China has reached 14~1.50,000 t a, almost all of which adopt the "p-cresol oxidation method" process, but it is not easy to stably obtain high-quality products.
The "phenol-formaldehyde method" process was industrialized in Japan in the 80s of the last century, and Japan's p-hydroxybenzaldehyde production technology is unique in the world, but the specific technical dynamics are rarely reported.
The "phenol-formaldehyde method" adopted in this project has made a new breakthrough in the process and solved the technical problems that the reaction selectivity and product yield are difficult to improve.
In addition, the "phenol-formaldehyde method" process of this project adopts a fully continuous production process and a DCS control system, which is suitable for the construction of large-scale industrial production equipment. (Mantari can provide this technical service support).
reaction principle
Synthetic p-hydroxybenzaldehyde.
Comparison of reaction principles.
The reaction principle of the traditional "p-cresol oxidation" process
Using p-cresol as raw material, p-hydroxybenzaldehyde is synthesized through a one-step oxidation reaction, and the reaction principle is as follows
The reaction principle of the "phenol-formaldehyde method" of this project
Using phenol and formaldehyde as raw materials, p-hydroxybenzaldehyde is synthesized by condensation and oxidation in 2 steps, and the reaction principle is as follows
technological advantage
Cost, environmental protection and quality.
It has more advantages than traditional craftsmanship.
The "phenol-formaldehyde method" process replaces the higher p-cresol with the most inexpensive phenol and formaldehydeproductionCosts have dropped dramatically
Phenol-formaldehyde processAcid and alkali consumption and waste salt production decreased by 50%.
The p-cresol oxidation method adopts an intermittent production process, which makes it difficult to obtain high-quality products stably; The "phenol-formaldehyde method" is adoptedFully continuous production process and DCS control systemHigh-quality products can be obtained stably.
Hotspot Engine ProgramComparison table of raw material costing for the two processes
As can be seen in the table, the cost of raw materials for the "phenol-formaldehyde method" process has decreased by 150,000 tons.
market conditions
High quality para-hydroxybenzaldehyde.
Ensuring the production of KRF photoresists.
Para-hydroxybenzaldehyde is the main raw material for the synthesis of the deep ultraviolet KRF photoresist film-forming resin PHS monomer acetoxystyrene, and high-quality p-hydroxybenzaldehyde is the guarantee for the production of KRF photoresist.
At present, the high-end photoresist market is monopolized by Japanese companies, and film-forming resins and monomers are monopolized by Europe, America, Japan and South Korea. In the photoresist sub-category, KRF is considered to be the fastest-growing sub-category in China in the future, with a localization rate of less than 5%, and there is a lot of room for domestic substitution.
The "phenol-formaldehyde method" process can change the situation that the manufacturers of p-hydroxybenzaldehyde in China are relatively scattered, the production scale is small and the quality is not high, and provide support for the localization process of China's photoresist and raw material industry.