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Wison Engineering Proprietary Butene Oxidization and Dehydrogenation(ODH) to Butadiene Technology

To cater to the tremendous demand for butadiene in the domestic market, Wison Engineering’s proprietary butene oxidization and dehydrogenation technology can boost butadiene production while reducing the investment costs and energy consumption, thereby generating more economic benefits for enterprises.

The new technology, featuring a new catalyst with better performance, was developed by Wison Engineering (with patent applied) based on the traditional B-02 iron-based catalyst technology, which enables the one-way conversion rate and yield rate 3-4% and 2-3% higher compared to the traditional technology respectively. The capacity of a single butadiene production line using this technology can reach up to 100,000 tons/year. Meanwhile, the separation component adopts NMP extractive distillation technology, which will greatly reduce investment costs and save energy consumption. Furthermore, this new technology has certain features that are suitable for large-scale production, such as reactor technology, wastewater reuse and renewable catalysts in production. Currently Wison Engineering has already completed most of the work for the process package design of a butadiene plant with capacity of 75,000 ton/year.

Butanes and Lighter Components are separated from Butenes in C4 Pre-Separation Unit. Then Butenes are mixed in proportion with air and steam, and sent to Oxidative Dehydrogenation(ODH) Reactor. The reaction gas from the reactor is for heat recovery, and then sent to Water and Acid Wash Tower. In which, the reaction gas is further cooled, and acid and other impurities are removed from the reaction gas. The gas from the top of the Water and Acid Wash Tower is compressed and then sent to Oil Absorber and Disabsorber System. In which, the crude 13BD is separated, and then sent to Butadiene Extraction Unit. Finally, high purity of 13BD product is obtained. And residual C4 stream from the top of extraction column returns to C4 Pre-Separation Unit for circulating use. The waste water and extraction solvent are treated in the Solvent Recovery and Waste Water Treatment Unit. Flow diagram as shown in Figure 1.

流程

Figure 1.ODH Process Diagram

Compared with the existing technology, Wison technology has the characteristics as follows.

  • a) Plant adopts a single production of 100kt per year;
  • b) Energy integration and optimization, can greatly reduce energy consumption;
  • c) Catalyst on-line regeneration, to ensure the long term operation of the plant;
  • d) Plant waste water reuse;
  • e) Using NMP technology to decrease plant investment and save energy consumption greatly; Also can use the improved ACN technology, increasing customer’s choice.

In addition to the above advantages, Wison also carried out the ODH catalyst development. On the basis of B-02 iron-based catalyst, new type catalyst with superior performance should be researched and developed to reduce material and energy consumption in the plant.

On the basis of B-02, the conversion rate should be increased by 3% to 5%, reaching to about 77-79%;