Issue 36/2015 - Solving the problem of coal-to-ethylene glycol wastewater treatment

The wastewater treatment problem that has long plagued coal-to-ethylene glycol projects has been solved
.
The catalytic reduction technology of nitric acid developed by Dalian Ruike Technology Co.
, Ltd.
can reduce the nitric acid content in the wastewater of the coal-to-ethylene glycol process to less than 0.
1%, and the unit consumption of raw materials such as sodium nitrite, nitric acid and sodium hydroxide can be reduced by more than 90% at the
same time.
At present, this technology has been applied
in the industry of Puyang Yongjin Chemical Co.
, Ltd.
and Luoyang Yongjin Chemical Co.
, Ltd.

According to the person in charge of Dalian Ruike, Henan Energy and Chemical Industry Group has built 5 sets of coal-to-ethylene glycol plants with an annual output of 200,000 tons, and the problem of high concentration nitrate in wastewater has been affecting the normal operation of the plant after it was put into operation
.
In October 2014, Dalian Rick cooperated with Henan Energy Chemical to apply nitric acid reduction technology to Puyang Yongjin's 200,000-ton coal-to-ethylene glycol process
.
The nitric acid reduction device was successfully started up at
one time.
The operation of the device is stable, the nitric acid content of the process wastewater is reduced from 1.
2% to less than 0.
1%, and the problem of environmental protection treatment of wastewater is solved
.
At the same time, after nitric acid reduction, the unit consumption of raw materials sodium nitrite, nitric acid and sodium hydroxide is reduced by more than 90%, which can save more than 40 million yuan
in raw material costs every year.

In recent years, many domestic scientific research are developing coal-to-ethylene glycol processes
.
Due to the neglect of the treatment of nitrogen oxides in wastewater, environmental protection has become a big problem
encountered after the coal-to-ethylene glycol project is put into operation.
In response to this problem, Nikke Dalian organized researchers to carry out scientific research on wastewater treatment technology of coal-to-ethylene glycol process, and took the lead in successfully developing nitric acid catalytic reduction technology
in the world.
This technology can reduce the nitric acid in the coal-to-ethylene glycol regeneration solution, convert it into nitrite and return it to the system as a raw material, and reduce the nitric acid content of the treated process wastewater to less than
0.
1%.
(Country)