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Recently, Zhejiang University, Sinopec Qilu Branch and Hangzhou Shuangan Technology Co.
, Ltd.
jointly completed the new technology of residual pressure expansion cryogenic method for green and efficient recovery of polyolefin emission gas, which won the first prize of scientific and technological progress of the Science and Technology Award of China Petroleum and Chemical Industry Federation in 2020
.
With the funding of "973" and other national projects, the project research team has developed technologies such as efficient recovery and cryogenic monitoring of polymer VOCs desorption-cryogenic nitrogen cycle and polymerization reaction-cryogenic hydrocarbon cycle through innovative residual pressure expansion cryogenic heat-mass-power exchange network and equipment, which solves the industry problems
of difficult desorption of high-carbon VOCs in polymers, difficult recovery of low-carbon VOCs in emissions, and difficult monitoring of trace sensitive components in the process.
Industrial applications have shown that the technology provides flexibility to handle simultaneous recovery
of exhaust gas from single to dual reactors, from unimodal to bimodal resin grades, and from single to multi-unit emissions.
The recovery rate of heavy hydrocarbons can reach 100%, the recovery rate of light hydrocarbons exceeds 90%, and the recovery rate of nitrogen gas exceeds 75%; The content of high-carbon VOCs in chromium-based high-density polyethylene products is reduced by 20%, the product odor is significantly reduced, the quality is significantly improved, the driving time is shortened by 50%, and the number of
unplanned stops of the installation is reduced.
This technology has been promoted and applied on 36 sets of large-scale polyolefin plants, accounting for more than 70% of China's gas-phase polyethylene production capacity, so that polyolefin plants have a calm and intelligent Chinese sharp weapon, and improve the clean production level
of the plant.
