The new process of direct oxidation of propylene oxide is internationally leading

Recently, the new process of producing propylene oxide from hydrogen peroxide directly oxidized propylene in liquid-solid circulating fluidized bed (FHPPO) passed the evaluation of the results organized by the China Petroleum and Chemical Industry Federation
.
The evaluation committee, chaired by Peng Xiaojun, an academician of the Chinese Academy of Sciences, unanimously believes that the technology has strong technological innovation, good application prospects, and has reached the international leading level, and recommends accelerating the construction of
demonstration devices.

The project was jointly developed
by researcher Huang Jiahui and Liu Yingchun, senior engineer team of Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and Tianjin Dagu Chemical Co.
, Ltd.
Unlike the hydrogen peroxide direct oxidation method of propylene oxide (HPPO) process, FHPPO applies liquid-solid circulating fluidized bed reactors to propylene oxide production, opening up a new field of
industrial applications for liquid-solid circulating fluidized bed reactors.
The process has the characteristics of green and low carbon, high safety and good economy, and the key technical indicators are better than the existing process
.
FHPPO adopts the liquid-solid circulation fluidized bed reaction-regeneration system instead of the traditional tubular fixed bed reactor, which strengthens the heat transfer and mass transfer rate of the propylene liquid phase epoxidation reaction process and improves the production efficiency
of propylene oxide.
The catalyst can be continuously recycled and replaced, which realizes a high degree of coupling between
epoxidation reaction and catalyst regeneration.

The project was launched in 2019 and the 100-ton pilot plant was completed and put into operation
in 2021.
From January 8 to 10, 2022, the Petrochemical Federation organized an expert group to conduct 72 consecutive hours of assessment and calibration
of the pilot plant.
The calibration results show that the hydrogen peroxide conversion rate of the device is 99.
7%, the selectivity of propylene oxide is 98.
2%, the effective utilization rate of hydrogen peroxide is 99.
9%, the purity of the product is 99.
95%, and the spatio-temporal yield is 2 to 3 times that
of similar technologies at home and abroad.

Some propylene oxide enterprises said that if this new technology can be industrialized as soon as possible, it is expected to improve the level of propylene oxide production technology in
China.

It is understood that with the continuous advancement of the "double carbon" policy, the propylene oxide industry is facing transformation and upgrading, and the co-oxidation system of propylene oxide route and HPPO have gradually become the mainstream
of industry development.
HPPO has the characteristics of less pollution, mild reaction conditions, etc.
, in recent years, the global HPPO propylene oxide new projects are increasing, and many domestic enterprises and research institutes have gradually broken through the core process technology
of HPPO.

In 2014, Sinopec Stone Science and Technology Institute and Changling Refining and Chemical Co.
, Ltd.
developed the first set of 100,000 tons/year HPPO industrial plant in China using independent technology, making China the third country
in the world to have complete sets of HPPO technology.
In 2018, the technology was identified as internationally advanced, of which catalyst technology and material consumption were at the international leading level
.

On September 12 this year, Yida Co.
, Ltd.
issued an announcement that Taixing Yida 150,000 tons / year propylene oxide project, using Yida independent research and development of HPPO process technology, after trial production and operation, has been mass-produced in line with the national standard GB/T 14491-2015 "industrial propylene oxide" excellent grade products, to meet the needs of
market customers.

In addition, Dalian Zhongxin Catalyst, China Tianchen, East China University of Science and Technology, etc.
have made breakthroughs
in HPPO technology and industrialization.