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Aliphatic/cyclic isocyanate (ADI) is the core raw material for the production of high-grade polyurethane, and the polyurethane material prepared from it has become a key basic material supporting the development of aerospace, military, high-end equipment, automobiles and other industries
.
ADI product technology blocked
ADI product technology blockedPolyurethane is a high molecular polymer formed by the reaction of isocyanate (MDI, TDI, ADI) with polyols and various additives.
Isocyanate is the core raw material of polyurethane.
Among them, aliphatic isocyanates are collectively referred to as ADI, and their representative varieties are isophor Irone diisocyanate (IPDI), 1,6-hexamethylene diisocyanate (HDI) and dicyclohexylmethane diisocyanate (H12MDI)
.
Among the three representative varieties of ADI, IPDI is the most ideal curing agent for solid rocket propellants.
It has been restricted from exporting to China by the Paris Coordination Committee for a long time.
Due to the blockade of foreign technologies and products, China can only be forced to use TDI with poor performance.
Curing system; H12MDI is a key monomer for the preparation of transparent armored bulletproof glass, high-speed train front glass, optical lenses, and high-grade spandex
.
Due to the long process of the ADI manufacturing industry chain and the high difficulty of technological development, for more than 70 years of industrialization, only Covestro and BASF, France Kangrui and Japan Nanyang Chemical can produce HDI in the world, and only four companies can produce IPDI and H12MDI.
Evonik and Covestro are two companies
.
Start with Basic Synthetic Research
Start with Basic Synthetic ResearchChina has approved the introduction of technology to build ADI devices several times, but they were all stranded due to foreign technology blockade
.
In view of the important role of ADI in national defense and national economic development, Wanhua began 17 years of perseverance efforts
.
ADI manufacturing includes three industrial chains of HDI and adducts, IP-IPN-IPDA-IPDI, MDA-H12MDA-H12MDI
.
Develop four core technologies
Develop four core technologiesAccording to Hua Weiqi, the ADI whole industry chain manufacturing technology developed by Wanhua mainly includes four core technologies: phosgenation, ammoniated hydrogenation, catalytic hydrogenation and reactive distillation
.
One is the common technology of isocyanate production by gas phase phosgenation
.
Wanhua has developed a common technology for the production of isocyanates by gas-phase phosgenation by improving the way of phosgenation reaction
.
Compared with the liquid phase method, the yield of this technology is increased by 3% to 8%; the solvent consumption is reduced by 50%, which is more energy-saving; the phosgene stock is reduced by 30%, and the reaction is safer
.
The second is the common technology of ammoniation and hydrogenation
.
Wanhua independently developed a composite nano-hydrogenation catalyst with high selectivity and high conversion rate.
At 150 atmospheres, the yield of IPDA reached 95.
5%, the content of amino nitrile was less than 0.
4%, and the catalyst could operate continuously and stably for more than 2 years; development A multi-stage fixed-bed hydrogenation reactor and a special auxiliary system were used to further increase the yield of IPDA to over 99%, and the content of amino nitrile to fall below 0.
03%
.
The third is the high activity catalytic hydrogenation technology of benzene ring
.
The hydrogenation pressure of this technology is low, which can reduce the investment cost of the device.
The newly developed supported nano-ruthenium-rhodium catalyst can reduce the catalyst consumption per ton of product by 1,200 yuan, with good hydrogenation selectivity and better application performance
.
Using this catalytic system and kettle-type hydrogenation process, Wanhua has developed industrial technologies for HTDA, H6XDA, cyclohexylamine and other products
.
Fourth, reactive distillation coupling technology
.
Wanhua has realized the efficient coupling of reaction and rectification by developing the staged condensation reaction distillation process, so that the conversion rate of acetone in one pass can reach 10%~15%, and the selectivity of isophorone can reach 90%.
Product rectification, energy saving is remarkable
.
Create ADI characteristic industry clusters
Create ADI characteristic industry clusters Relying on these innovative achievements, Wanhua has successively built 50,000 tons/year HDI, 15,000 tons/year IPDI, 10,000 tons/year H12MDI, 25,000 tons/year IPDA, 10,000 tons/year H12MDA and other industrialized units.
The ADI characteristic industry group with the most complete varieties, the most complete industrial chain and the leading technology in the world.
Currently, the market share of Wanhua ADI series products ranks second in the world
.
As of November 2019, the accumulated sales revenue was 12 billion yuan, and profits and taxes were 5.
2 billion yuan
.
The successful implementation of the Wanhua ADI project broke the 70-year monopoly of foreign companies on the manufacturing technology of the entire industry chain of ADI series products, making Wanhua the only company in the world to master the whole industry chain MDA-H12MDA-H12MDI, and the second company in the world to master the whole industry chain.
The industrial chain IP-IPN-IPDA-IPDI, the only domestic enterprise that masters core technologies such as HDI and derivatives, has realized the localized independent supply of key raw materials in the fields of aerospace and military industry, high-end equipment, etc.
, providing strong support for building the country's most important weapon
.
