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Continuous electrolysis method by means of electrolytic bath for polysulfide manufacturing, and electrolysis device for implementing same

An electrolysis method and electrolytic cell technology are applied in the field of continuous electrolysis using an electrolytic cell for polysulfide production and an electrolytic device for implementing the same, which can solve the problems of producing distillate, difficulty in high selectivity, etc.

Active Publication Date: 2015-08-19
NIPPON PAPER IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But, in the described method, when promoting conversion rate, because as the side reaction shown in following reaction formula (2), (3), by-generate a large amount of thiosulfate ions that do not help to digest at all, therefore, be difficult to High selectivity produces digestate containing high concentration of polysulfide

Method used

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  • Continuous electrolysis method by means of electrolytic bath for polysulfide manufacturing, and electrolysis device for implementing same
  • Continuous electrolysis method by means of electrolytic bath for polysulfide manufacturing, and electrolysis device for implementing same
  • Continuous electrolysis method by means of electrolytic bath for polysulfide manufacturing, and electrolysis device for implementing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] In white liquor electrolyzers in continuous electrolysis, electrolysis is not stopped, from figure 2 The indicated site was added with an antiscalant (Kurita Kogyo Co., Ltd.: Depoclean 830) at 3.2 mg / l relative to the white liquor, and electrolysis was continued continuously. The electrolytic current density is set to 5.7kA / m 2 , The white liquor temperature is set at 90°C, and the sodium sulfide concentration in the white liquor is set at 30g / l-35g / l. The frequency of adding the anti-scaling agent was repeated two days a week, and as a result, the average cell voltage rise rate for 30 days was 2.4mV / day. In addition, it was confirmed that there was no difference in the polysulfide generation current efficiency regardless of the presence or absence of the addition of the antifouling agent.

Embodiment 2

[0073] In white liquor electrolyzers in continuous electrolysis, electrolysis is not stopped, from figure 2 The indicated site was added with an antiscalant (Kurita Kogyo Co., Ltd.: Depoclean 830) at 3.2 mg / l relative to the white liquor, and electrolysis was continued continuously. The electrolytic current density is set to 5.7kA / m 2 , The white liquor temperature is set at 90°C, and the sodium sulfide concentration in the white liquor is set at 30g / l-35g / l. The frequency of adding the anti-scale agent is repeated two days a week. In addition, in the middle of continuous electrolysis, without stopping the electrolysis, a dirt cleaning agent (Kurita Kogyo Co., Ltd.: Depoclean 505G) was added once a week so as to become 20 g / l in the white liquor storage tank. As a result, the average tank voltage for 30 days increased. The speed is 1.8mV / day. In addition, it was confirmed that there was no difference in the polysulfide generation current efficiency regardless of the presenc...

Embodiment 3

[0075] Stop the white liquor electrolyzer in the continuous electrolysis, replace the anolyte in the white liquor storage tank with 10% sodium hydroxide solution containing 20g / l~50g / l dirt cleaning agent (Kurita Industry Co., Ltd.: Depoclean 505G), After circulating in the anolyte system for 24 hours, white liquor was injected into the white liquor storage tank again, and electrolysis was started in the same manner as in Example 1. An antifouling agent (Kurita Kogyo Co., Ltd.: Depoclean 830) was also added in the same manner as in Example 1 at the restart of electrolysis so as to be 3.2 mg / l with respect to the white liquor, and electrolysis was continued continuously. The electrolytic current density is set to 5.7kA / m 2 , The white liquor temperature is set at 90°C, and the sodium sulfide concentration in the white liquor is set at 30g / l-35g / l. The frequency of adding the anti-scale agent is repeated two days a week. The 30-day average cell voltage increase rate at this ti...

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Abstract

An electrolysis method and a device therefor, which achieve a stable continuous operation and prevent the influence of scale that can deposit within the system over time, are provided for an electrolysis system that carries out the electrolysis of white liquor used in a cooking step in a kraft pulp method, which is a pulp production method, in order to electrolytically produce polysulfide through oxidation of sodium sulfide in the white liquor. The electrolysis method of preventing the voltage of an electrolytic bath from rising over time without halting electrolysis and the electrolysis device for executing the method implement are provided such that: in operation of a two-compartment electrolytic bath, which has a membrane partitioning an anode compartment from a cathode compartment and in which a sulfide ion-containing white liquor for use in a pulp production process is fed into the anode compartment while direct current is supplied to the electrolytic bath to produce polysulfide in the anode compartment through electrolysis, and a sulfide ion-containing white liquor for use in a pulp production process that contains at least one of a scale cleaning agent and a scale inhibitor is fed to the anode compartment.

Description

technical field [0001] The present invention relates to a continuous electrolysis method using an electrolytic cell for producing polysulfides and an electrolysis device for carrying out the continuous electrolysis method. The electrolysis device, ie, the white liquor electrolysis cell, and its peripheral equipment operate continuously without maintenance. Background technique [0002] In order to effectively utilize wood resources, that is, to effectively utilize wood resources, increasing the yield of chemical pulp (pulp) is an important issue. One of the techniques for increasing the yield of kraft pulp, which is the mainstream of the above-mentioned chemical pulp, is a polysulfide steaming process (process). The steaming solution in the polysulfide steaming process is produced in the following way: as shown in the following reaction formula (1), in the presence of a catalyst such as activated carbon, the alkaline aqueous solution containing sodium sulfide, the so-called...

Claims

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Application Information

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IPC IPC(8): C25B15/08C02F1/46C25B1/00C25B1/14C25B15/00D21C11/00C25B9/19
CPCD21C11/0042C25B15/00D21C3/02C25B1/00C25B1/14D21C11/00C25B9/08C25B15/02C02F1/46C02F1/4602C02F1/46109C02F2001/46119C02F2201/4611C25B15/08C25B9/19
Inventor 陶山健一郎黒须一博加藤昌明大津秀绪
Owner NIPPON PAPER IND CO LTD
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