HC Plastics News:
Wanhua Chemical Group Co., Ltd. undertakes the high-efficiency green preparation of propylene oxide (PO) complete technology project of ethylbenzene co-oxidation method, which has been approved by the China Petroleum and Chemical Industry Federation. The expert committee composed of academicians Chen Jianfeng, Yan Xigao and Li Yadong of the Chinese Academy of Sciences identified that the project's results broke the monopoly of foreign technology and the overall technology entered the international leading ranks.
According to Hua Weiqi, Director of Chemical Technology of Wanhua, Wanhua completed the whole process and catalytic technology development of propylene oxide co-oxidation to propylene oxide in 6 years, and applied for 18 domestic and foreign invention patents, of which PCT4 pieces have completely mastered High-efficiency green preparation of propylene oxide complete technology by ethylbenzene co-oxidation method with independent intellectual property rights.
Hu Qianlin, deputy secretary general of the Petrochemical Federation, said that the complete set of technology is green, clean and has comprehensive competitive strength, which promotes the upgrading of propylene oxide production technology.
Propylene oxide is a high-end petrochemical product that the state encourages to develop. At present, the production of propylene oxide in China mainly adopts the chlorohydrin process, and the equipment is seriously corroded, and the calcium chloride-containing wastewater generated seriously pollutes the environment. The ethylbenzene co-oxidation process has the characteristics of “three wastesâ€, high added value of joint products, low energy consumption and good economy. It has been encouraged by the state to develop, but the technology has long been monopolized and blocked by foreign companies.
In order to promote the domestic propylene oxide industry technology upgrade, Wanhua Chemical started a team several years ago to start the independent development of the ethylbenzene co-oxidation process, and cooperated with Zhejiang University to carry out small-scale research. In order to break through the technical blockade, nearly 100 scientific and technological personnel of Wanhua Chemical participated in the research and development of this project, and developed the co-oxidation of ethylbenzene including four core technologies of ethylbenzene peroxidation, propylene epoxidation, phenylethyl alcohol dehydration and acetophenone hydrogenation. Complete propylene oxide technology. The complete set of technologies has achieved many innovations. The peroxidation reactor and process of the vertical bubble column and horizontal multi-stage bubble agitation tank developed by the project team can eliminate the oxygen-poor zone and strengthen the gas-liquid mass transfer, so that the choice of ethylbenzene peroxide (EBHP) >87%; Wanhua developed high activity, high stability rare earth modified Ti-Si propylene epoxidation catalyst and supporting constant temperature + adiabatic combination of epoxidation reactor and process, making EBHP conversion rate >99% , PO selectivity>94%, stable operation of the catalyst for more than 2000 hours; Wanhua developed styrene dehydration to styrene external circulation reaction process can reduce the use of high-grade materials and equipment maintenance and maintenance difficulty, styrene yield>98 %; The acetophenone liquid phase hydrogenation Cu-Zn-Si catalyst and the trickle bed reactor hydrogenation process developed by the project resulted in a conversion of acetophenone of >98% and a selectivity of benzyl alcohol of >99%. In order to make full use of the peroxide in the wastewater, Wanhua also developed an in-situ catalytic oxidation process for peroxide-containing wastewater, which resulted in a peroxide removal rate of >97% and a biodegradability (B/C) from 0.2 to 0.6.
With this complete set of technology, Wanhua Chemical independently designed and built an industrialized test device with an annual output of 500 tons of propylene oxide in parallel to produce 1,100 tons of styrene, achieving long-term stable operation for more than 90 days. The test device is safe and stable, and the “three wastes†are discharged. 
Editor in charge: Yao Chunlin
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