Issue 39/2013 - Duolun coal chemical industry recovers propylene gas to create great efficiency

Duolun coal chemical industry recovers propylene gas to create great efficiency

A few days ago, the tail gas recovery system of the polypropylene branch of Datang Duolun Coal Chemical Company reached the optimal state, recovering 10 tons of
high-purity propylene gas per hour.
At present, the company's two reactors of the double line of the polypropylene plant are running in parallel at the same time, producing 1,280 tons of polypropylene pellet products per day, and the exhaust gas recovery system recovers 240 tons of
propylene gas per day.

The polypropylene plant is responsible for polymerizing the propylene produced upstream into a polypropylene pellet product
.
The device adopts the first domestic Dow Chemical Unipol gas phase polymerization propylene technology, with an annual output of 500,000 tons
of polypropylene.
In November 2009, the plant was successfully started up under the guidance of foreign technicians, but the important exhaust gas recovery system in the device has not been put into use, and a large amount of exhaust gas containing propylene gas can only be burned by the external flare system, and the economic loss is serious
.

Since the end of 2011, technicians at the polypropylene branch have independently commissioned and operated the exhaust gas recovery system to increase the output of
polypropylene products.
The exhaust gas recovery system recovers the exhaust gas containing propylene gas, nitrogen and hydrogen in the reactor discharge process, of which the propylene gas content is between
80%~90%.
Through the recovery system, the propylene gas circulates into the reactor for reuse
.
(Li Mu)