Efficient electrolysis system for sodium chlorate production

Patent metadata

Field	Value
Publication number	US-2017350022-A1
Application number	US-201715589514-A
Country	US
Kind code	A1
Filing date	May 8, 2017
Priority date	Jun 7, 2016
Publication date	Dec 7, 2017
Grant date	—

Abstract

An efficient electrolysis system for sodium chlorate production may include round or oval cells, reactors, a product pump transfer, a buffer tank, a circulation pump, and explosive clad plate, all of which are connected by way of pipelines. Inlet and the outlet of each cell are separately connected with the reactor via titanium pipes, allowing the electrolyte to recirculate naturally between the cells and the reactors. The outlet of every cell is conical while each reactor includes a standard electrolytic unit with three to eight cells. The electrolytic units are modularly identical and symmetrically linked to the buffer tank. Within each unit, adjacent cells are connected with the explosive clad plates. The buffer tank may be divided into two parts—part A and part B—with part A connecting with the overflow port of the reactor via pipeline, and the part B connecting with the reactor via the circulation pump. Part B is equipped with a refined brine feed pipe on the top, the bottom of part A connects with a product transfer pump ( 3 ) via pipeline.

First claim

1 . An electrolysis system for sodium chlorate production, comprising:
a plurality of round or oval cells, a reactor, a product transfer pump, a buffer tank, a circulation pump, and a plurality of explosive clad plates connected together through pipelines; inlet and outlet of each of the plurality of cells are separately connected with the reactor via titanium pipes, allowing electrolytes to circulate between each of the plurality of cells and the reactor, wherein the outlet of each of the plurality of cells is conical, the reactor comprises an electrolytic unit, the electrolytic unit is formed by no less than three and no more than eight cells with 25-30 m 2 of anode area, the electrolytic unit in each of the plurality of reactors are modularly identical and symmetrically linked to the buffer tank, within each electrolytic unit, adjacent cells are connected with the plurality of explosive clad plates, optimizing space and currency loss by removing aluminum bars or copper bars between each of the adjacent cells, the buffer tank comprises part A and part B, the part A is connected with an overflow port of the reactor via pipeline, and part B is connected to the reactor via the circulation pump, the part B is equipped with a refined brine feeding pipe on the top, and bottom of the part A is connected with a product transfer pump via pipeline.

2 . The electrolysis system of claim 1 , wherein each of the plurality of cells are separately connected with the reactor via titanium pipes, allowing the electrolytes to naturally circulate between each of the plurality of cells and the reactor 2 , and
the outlet of each of the plurality of cells is conical.

3 . The electrolysis system of claim 1 , wherein the reactor is connected with 5-8 round or oval cells, with area of each cell being 25-30 m 2 .

4 . The electrolysis system of claim 1 , wherein that the electrolytic unit is modularly identical and symmetrically linked to the buffer tank for the entire electrolytic system.

5 . The electrolysis system of claim 1 , wherein the adjacent cells are connected by the plurality of explosive clad plates, each of the plurality of explosive clad plates comprises titanium-aluminum-steel or titanium-copper-steel layers, with the titanium side connecting to an anode and the steel side connecting to a cathode.

6 . The electrolysis system of claim 1 , wherein a top of the reactor is equipped with a hydrogen discharge pipe.

7 . An electrolysis process for producing sodium chlorate, comprising:
introducing refined brine into part B of a buffer tank during startup such that the refined brine is sent to a reactor by way of a circulation pump, facilitating the entering of the refined brine to a plurality of cells for electrolysis. introducing electrolyte into the reactor for reaction, to end up with 550-650 g/l sodium chlorate and 95-105 g/l sodium chloride, wherein the electrolyte overflows into part A of the buffer tank and is transferred to a de-hypo process by way of product transfer pump and hydrogen in the reactor is sent to next stage; continuously entering refined brine into the part B of the buffer tank continuously from the refined brine feeding pipe to mix with the overflowing electrolyte, and transferring, by way of the circulation pump, mixed liquor to enter the reactor and the plurality of cells for electrolysis and reaction, thereby generating an electrolyte that continuously includes 550-650 g/l sodium chlorate and 95-105 g/l sodium chloride.

8 . The process of claim 7 , wherein the electrolyte undergoes natural circulation between the plurality of cells the and reactor, and undergoes forced circulation between the buffer tank and the reactor with the circulation pump.

Assignees

• Univ Guangxi

Inventors

• Wang Shuangfei
• Qin Chengrong
• Li Xusheng
• Liang Chen
• Liu Xinliang
• Wang Zhiwei

Classifications

• C25B1/265 Primary

  Chlorates · CPC title

• C25B9/18

  Chemistry & Metallurgy · mapped topic

• C25B15/08

  Supplying or removing reactants or electrolytes; Regeneration of electrolytes · CPC title

• C25B9/65

  Means for supplying current; Electrode connections; Electric inter-cell connections · CPC title

• C25B9/70

  Assemblies comprising two or more cells · CPC title