Method for reducing organic dissolved substances in gel hydrogen type cation exchange resin

Abstract

The invention belongs to the technical field of cation exchange resin treatment, and particularly relates to a method for reducing organic dissolved substances in gel hydrogen type cation exchange resin. Comprising the following steps: mixing gel hydrogen type cation exchange resin with water, and carrying out heat preservation treatment. The method has the beneficial effects that at 125 DEG C, oligomer and residual sulfonic acid groups in the gel hydrogen type cation resin are gradually decomposed into micromolecular organic matters and sulfonic acid which can be removed by a conventional cleaning method, so that a large amount of cleaning water (10-12 times) is saved compared with the original scheme, and meanwhile, the influence on other performance indexes of the resin is small; and the organic eluate index of the resin completely meets the index requirements of the nuclear-grade cation resin of the primary loop of the nuclear power station.

Description

Technical Field

[0001] The present invention belongs to the technical field of cation resin treatment, and particularly relates to a method for reducing organic eluates in gel hydrogen-type cation exchange resin. Background Art

[0002] In the high-temperature and high-pressure environment of nuclear power plants, there are stringent requirements for resins. Gel cation resins are actually high molecular polymers grafted with functional groups to produce ion exchange effects. High molecular polymers will inevitably release organic substances. When the organic eluates are high, the released organic molecules will decompose under high-temperature, high-pressure and irradiation environments, generating acid molecules, which will corrode equipment pipelines and increase unsafe factors. This method can effectively reduce the organic substances in gel cation exchange resin.

[0003] The existing solutions can only continuously wash the resin with hot pure water at 90°C to reduce organic eluates. The current solutions not only fail to meet the requirements but also waste a large amount of water resources. Therefore, there is a need to find a method that can effectively reduce the organic eluates in gel cation resins and reduce water consumption. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for reducing organic eluates in gel hydrogen-type cation exchange resin, which can not only reduce the organic eluates in gel hydrogen-type cation resins but also reduce water consumption.

[0005] The technical solution of the present invention is as follows: A method for reducing organic eluates in gel hydrogen-type cation exchange resin, comprising the following steps: mixing the gel hydrogen-type cation exchange resin with water and then performing heat preservation treatment.

[0006] The heat preservation treatment is carried out at 125°C.

[0007] The volume ratio of the gel hydrogen-type cation exchange resin to water is 1:1.

[0008] The time of the heat preservation treatment is 4h.

[0009] The gel hydrogen-type cation exchange resin includes nuclear-grade 001×16 hydrogen-type resin and / or nuclear-grade 001×10 hydrogen-type resin.

[0010] The nuclear-grade 001×16 hydrogen-type resin is from Ningbo Zhengguang Resin Co., Ltd.

[0011] The nuclear-grade 001×10 hydrogen-type resin is from Ningbo Zhengguang Resin Co., Ltd.

[0012] The beneficial effects of the present invention are as follows: at 125°C, the oligomers and residual sulfonic acid groups inside the gel hydrogen-type cation exchange resin are gradually decomposed into small-molecule organic substances and sulfonic acid, and these substances can be removed by conventional cleaning methods, saving a large amount of cleaning water (10 - 12 times) compared with the original solution. At the same time, it has little impact on other performance indicators of the resin, and the organic extract index of the resin fully meets the index requirements of nuclear-grade cation exchange resin in the primary loop of nuclear power plants. Detailed implementation mode

[0013] The present invention will be further described in detail below in conjunction with specific embodiments.

[0014] A method for reducing organic extracts in gel hydrogen-type cation exchange resin, comprising the following steps: mixing the gel hydrogen-type cation exchange resin with water and then carrying out heat preservation treatment at 125°C.

[0015] Preferably, the volume ratio of the gel hydrogen-type cation exchange resin to water is 1:1.

[0016] Preferably, the time of the heat preservation treatment is 4h.

[0017] Preferably, the gel hydrogen-type cation exchange resin includes nuclear-grade 001×16 hydrogen-type resin and / or nuclear-grade 001×10 hydrogen-type resin.

[0018] The present invention mixes the gel hydrogen-type cation exchange resin with water and treats it at 125°C to degrade the oligomers inside the resin, thus solving the problem of organic extracts generated during the use of the resin in the nuclear-grade field.

[0019] The present invention provides a method for reducing organic extracts in gel hydrogen-type cation exchange resin, comprising the following steps: mixing the gel hydrogen-type cation exchange resin with water and then carrying out heat preservation treatment at 125°C. In the present invention, the volume ratio of the gel hydrogen-type cation exchange resin to water is preferably 1:1. In the present invention, the time of the heat preservation treatment is preferably 4h. The present invention has no special limitation on the type of the gel hydrogen-type cation exchange resin, and it can be conventional. In the specific implementation mode of the present invention, the gel hydrogen-type cation exchange resin preferably includes nuclear-grade 001×16 hydrogen-type resin and / or nuclear-grade 001×10 hydrogen-type resin. In the present invention, the nuclear-grade 001×16 hydrogen-type resin and nuclear-grade 001×10 hydrogen-type resin are sourced from Ningbo Zhengguang Resin Co., Ltd.

[0020] In order to further illustrate the present invention, the present invention will be described in detail below in conjunction with embodiments, but they cannot be construed as limiting the protection scope of the present invention.

[0021] Example 1

[0022] A method for reducing organic extracts in gel hydrogen-type cation exchange resin, the steps are as follows:

[0023] 1. Mix 500 mL of nuclear-grade 001×16 hydrogen-form resin produced by Ningbo Zhengguang Resin Co., Ltd. with 500 mL of pure water;

[0024] 2. Pour it into a 2 L high-pressure reactor, heat up to 95 °C, and close the vent; continue to heat up to 125 °C and keep warm for 4 hours;

[0025] 3. After the heat preservation is completed, cool down to 65 °C, open the vent, and discharge the material.

[0026] Among them, the total exchange performance is detected by GB / T13659-2005;

[0027] The wet true density is detected by GB / T8330-2008;

[0028] The wet apparent density is detected by GB / T8831-2008;

[0029] The performance after grinding is detected by GB / T12598-2001;

[0030] The performance of osmotic grinding is detected by GB / T12598-2001;

[0031] The organic extractables are detected by DL / T1077-2018.

[0032] Table 1 Detection performance results

[0033]

[0034]

[0035] As can be seen from Table 1, the method provided by the present invention can detect and reduce the content of organic extractables in the resin.

[0036] Example 2

[0037] A method for reducing organic extractables in gel-type hydrogen-form cation exchange resin, the steps are as follows:

[0038] 1. Mix 500 mL of nuclear-grade 001×10 hydrogen-form resin produced by Ningbo Zhengguang Resin Co., Ltd. with 500 mL of pure water;

[0039] 2. Pour it into a 2 L high-pressure reactor, heat up to 95 °C, and close the vent; continue to heat up to 125 °C and keep warm for 4 hours;

[0040] 3. After the heat preservation is completed, cool down to 65 °C, open the vent, and discharge the material.

[0041] The methods for detecting the performance are the same as those in Example 1, and the results are shown in Table 2.

[0042] Table 2 Detection performance results

[0043]

[0044]

[0045] As can be seen from Table 2, the method provided by the present invention can detect and reduce the content of organic extracts in the resin.

[0046] Example 3

[0047] A method for reducing organic extracts in gel hydrogen-type cation exchange resin, the steps are as follows:

[0048] 1. Take 500 mL of nuclear-grade 001×16 hydrogen-type resin produced by Ningbo Zhengguang Resin Co., Ltd. and mix it with 500 mL of pure water;

[0049] 2. Pour it into a 2 L high-pressure reactor, heat up to 95 °C, and close the vent; continue to heat up to 125 °C and keep warm for 4 hours;

[0050] 3. After the heat preservation is completed, cool down to 65 °C, open the vent, and discharge the material.

[0051] The method for detecting performance is the same as that in Example 1, and the results are shown in Table 3.

[0052] Table 3 Detection performance results

[0053] Performance indicators Before treatment After treatment Total exchange mmol / g (dry) 4.40 4.38 Water content % 31.62 32.01 Wet true density g / ml 1.28 1.28 Wet apparent density g / ml 0.84 0.84 After grinding % 99.01 98.37 Penetration grinding % 95.66 95.41 Crushing strength g / g resin 1135 1068 Organic extractables mg / L 56.27 8.74

[0054] As can be seen from Table 3, the method provided by the present invention can detect and reduce the content of organic extracts in the resin.

[0055] Comparative Example 1

[0056] 1. Take 500 mL of nuclear-grade 001×16 hydrogen-type resin produced by Ningbo Zhengguang Resin Co., Ltd. and mix it with 500 mL of pure water;

[0057] 2. Pour it into a 2 L three-necked glass flask, heat it up to 90 °C in a water bath, and keep warm for 2 hours;

[0058] 3. Drain the hot water, add 500 ml of pure water, heat it up to 90 °C in a water bath, and keep warm for 2 hours;

[0059] 4. Drain the hot water, add 500 ml of pure water, heat it up to 90 °C in a water bath, and keep warm for 2 hours;

[0060] 4. After the heat preservation is completed, cool down to 65 °C, and discharge the material.

[0061] The method for detecting performance is the same as that in Example 1, and the results are shown in Table 4.

[0062] Table 4 Detection performance results

[0063] Performance indicators Before treatment After treatment Total exchange mmol / g (dry) 4.40 4.41 Water content % 31.62 31.36 Wet true density g / ml 1.28 1.28 Wet apparent density g / ml 0.84 0.84 After grinding % 99.01 98.67 Penetration grinding % 95.66 96.14 Crushing strength g / g resin 1135 1126 Organic extractables mg / L 56.27 16.33

[0064] As can be seen from the above embodiments, the method provided by the present invention can not only significantly reduce the organic extractables in the resin, but also significantly reduce the water consumption.

[0065] Although the above embodiments have described the present invention in detail, they are only a part of the embodiments of the present invention, rather than all the embodiments. People can also obtain other embodiments based on these embodiments without creative efforts, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A method for reducing organic extracts in a gel hydrogen-type cation exchange resin, characterized in that: The following steps are involved: The gel hydrogen type cation exchange resin is mixed with water and then subjected to heat preservation treatment.

2. A method for reducing organic extracts in a gel hydrogen-type cation exchange resin as claimed in claim 1, characterized in that: The heat preservation treatment is heat preservation treatment at 125°C.

3. A method for reducing organic extracts in a gel hydrogen-type cation exchange resin as claimed in claim 1, characterized in that: The volume ratio of the gel hydrogen type cation exchange resin to water is 1:

1.

4. A method for reducing organic extracts in a gel hydrogen-type cation exchange resin as claimed in claim 1, characterized in that: The time of the heat preservation treatment is 4 hours.

5. A method for reducing organic extracts in a gel hydrogen-type cation exchange resin as claimed in claim 1, characterized in that: The gel hydrogen type cation exchange resin includes nuclear grade 001×16 hydrogen type resin and / or nuclear grade 001×10 hydrogen type resin.

6. A method for reducing organic extracts in a gel hydrogen-type cation exchange resin as claimed in claim 5, characterized in that: The nuclear grade 001×16 hydrogen type resin is sourced from Ningbo Zhengguang Resin Co., Ltd.

7. A method for reducing organic extracts in a gel hydrogen-type cation exchange resin as claimed in claim 5, characterized in that: The nuclear grade 001×10 hydrogen type resin is sourced from Ningbo Zhengguang Resin Co., Ltd.

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