Improve the level of clean production of epoxy resin-remember the epoxy resin segmented reaction and closed loop process of the petrochemical green process

In recent years, due to slow progress in quality improvement, consumption reduction, and cleaner production processes, the rapid growth of the epoxy resin industry is largely based on repeated construction
.

In order to change the above situation, after more than 10 years of innovative research, Jiangsu Yangnong Chemical Group Co.

Split process to improve product quality

Split process to improve product quality

In the conventional process of liquid resin, the pre-reaction time is shorter than the main reaction time.
Enterprises usually design the two processes in the same reactor
.

However, the pre-reaction is an exothermic reaction, and the main reaction is an endothermic reaction under negative pressure.

The segmented process developed by Yangnong Group separates the pre-reaction and main reaction processes, and separately designs a single kettle with the only heat exchange function, so that the process parameters are in a stable control state
.

They adjusted the reaction process parameters to control the occupation time of the reactors at all levels within the same reaction time, so as to achieve the continuity of the device and maximize the production capacity; by controlling the conversion rate of BPA to reduce the side reactions in the reaction process, the resin The performance mentioned is further improved

Yangnong Group has also carried out systematic research and innovative applications in the improvement of resin chromaticity.
Through the use of the pre-melting system and the control of dissolved oxygen in the reaction process, the chromaticity of epoxy resin can reach 10-12 APHA, which is a year-on-year decrease of 3-5 APHA.
The resin application field
.

In addition, through the optimization of technical control points in the reaction process, the raw material consumption per ton of resin was reduced by more than 2 kilograms.

Innovative technology to achieve cleaner production

Innovative technology to achieve cleaner production

The process of crude resin dechlorination will produce more than 3‰ of aging resin, which not only has environmental risks, but also increases the cost of hazardous waste disposal
.

By increasing the utilization rate of refined alkali, Yangnong Group reduced the amount of aged resin to less than 1‰, and at the same time, the organic carbon content in the brine dropped by 20% year-on-year, further saving wastewater treatment costs

In the traditional process, the production of 1 ton of liquid epoxy resin produces approximately 0.
3 to 0.
4 tons of wastewater produced by recycled epichlorohydrin (ECH), 0.
2 tons of washed low-salt wastewater, and 1.
6-1.
8 tons of high-salt wastewater
.

Yangnong Group uses a closed loop process to separate the weakly acidic wastewater produced by ECH through technology, recovering water for the neutralization process, replacing the use of the neutralizing agent sodium dihydrogen phosphate; the mother liquor obtained from the separation is reused for the preparation of resin production raw material ECH ; At the same time, the low-salt wastewater generated by water washing is reused in the salt-dissolving process, and finally the zero-discharge and resource utilization of low-salt wastewater is realized
.

For liquid epoxy resin high-salt wastewater, Yangnong Group independently developed advanced oxidation process technology with recyclable catalysts
.

There is no solid waste generated during the oxidation process.

Build a system to expand the scale of the industry

Build a system to expand the scale of the industry

After 12 years of process exploration and technological transformation, the annual production capacity of Yangnong Group's epoxy resin has increased from 20,000 tons in 2008 to 170,000 tons now, and the green epoxy resin production process technology system has gradually matured
.

On this basis, Jiangsu Ruiheng New Material Technology Co.

At present, the reorganization of the "Industrialization and Industrialization" has been approved by the State Council.
It is expected that during the "14th Five-Year Plan" period, the total production capacity of liquid epoxy resin under the "Industrialization and Industrialization" system will reach more than 500,000 tons per year
.

With the help of internal resource sharing and complementary advantages after the reorganization of the "Industrialization and Industrialization", the proportion of epoxy resin green process capacity in the industry will be increased, and it will also promote the improvement of the level of cleaner production in the entire industry and lead the structural adjustment of the epoxy resin industry And industrial upgrading