Resin pretreatment method

Abstract

The invention discloses a resin pretreatment method, and relates to the field of chemistry. Comprising the following steps: filling a container with a height-diameter ratio of (1.5-4): 1 with resin to be detected, and washing with water to obtain first resin; if the type of the to-be-treated resin is strongly basic anion resin, sequentially carrying out acid pickling, alkali washing and water washing on the first resin to obtain pretreated resin; if the type of the to-be-treated resin is strongly acidic cationic resin, sequentially carrying out alkali washing, acid washing and water washing on the first resin to obtain pretreated resin; if the type of the to-be-treated resin is adsorbent resin, performing salt washing, acid washing and alkali washing on the first resin to obtain pretreated resin; after a container with the height-diameter ratio of (1.5-4): 1 is washed with water, a proper treatment mode is selected according to the type of the resin, so that the carrying of residues in the resin can be reduced, the pollution of the residues to water during water treatment is reduced, the water quality of resin treatment water is improved, and higher requirements are met.

Description

Technical Field

[0001] The present application relates to the field of chemical technology, and in particular to a resin pretreatment method. Background Art

[0002] Economic development has put forward higher requirements on the quality of water used. For example, the demand for ultrapure water and electronic grade ultrapure water in semiconductors, integrated circuits, photovoltaics, electricity, pharmaceuticals, etc. has increased dramatically; space stations, ships, etc. also have huge demands for recycled water and drinking water treatment. The demand for high-quality water quality in these fields depends on water treatment materials. Ion exchange resins and adsorption resins are a class of materials widely used in high-quality water treatment. Among them, ion exchange resins include cation exchange resins and anion exchange resins. Since they can remove ionic substances in water, they are generally used in the preparation of deionized water and electronic grade ultrapure water; while adsorption resins are generally used to remove organic pollutants in water, and have many applications in industrial wastewater treatment, resource recovery and recycled water preparation.

[0003] However, existing resins have the problem of continuous and long-term release of residues during the pretreatment process, which in turn affects water quality. Summary of the invention

[0004] The present application provides a resin pretreatment method to solve the problem of continuous and long-term release of residues.

[0005] In a first aspect, the present application provides a resin pretreatment method, comprising the following steps:

[0006] Fill the resin to be tested into a container with a height-to-diameter ratio of (1.5-4):1, and wash with water to obtain a first resin;

[0007] If the type of the resin to be treated is a basic anion resin, the first resin is sequentially acid-washed, alkali-washed, and water-washed to obtain a pretreated resin;

[0008] If the type of the resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin;

[0009] If the type of the resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin.

[0010] In the present application, after washing with a container having a height-to-diameter ratio of (1.5-4):1, a suitable treatment method is selected according to the type of resin, which can reduce the carryover of residues in the resin, reduce the pollution of water by residues when treating water quality, improve the water quality of resin treatment water, and meet higher requirements. It should be noted that the height-to-diameter ratio of the treatment container will cause the contact state between the cleaning liquid and the resin particles, thereby affecting the resin cleaning effect.

[0011] In some embodiments, the step of filling the resin to be tested into a container with a height-to-diameter ratio of (1.5-4):1 and washing with water to obtain the first resin further comprises:

[0012] The resin to be tested is washed with water, filled into a cleaning container, cleaned with an organic solvent, and subjected to steam stripping treatment.

[0013] Through water washing, organic solvent washing and steam stripping treatment, most of the water-soluble residues and fat-soluble residues in the resin can be washed away, reducing the residual impurities in the resin.

[0014] In some embodiments, the number of water washings is 3 to 10 times. The more times the water washings are performed, the better the impurity removal effect is. When the number of water washings is within this range, the residual water-soluble impurities in the resin can be reduced; and / or,

[0015] The height-to-diameter ratio of the cleaning container is (1-2): 1. When the height-to-diameter ratio of the cleaning container is within this range, better cleaning can be achieved.

[0016] In some embodiments, the organic solvent includes at least one of methanol, ethanol, acetone and toluene. Using at least one of the above organic solvents can effectively remove the residual organic matter in the resin, so that the concentration of organic dissolution in the resin is reduced; and / or,

[0017] When cleaning with an organic solvent, the volume ratio of the organic solvent to the resin to be tested is (1.5-10):1. When the volume ratio of the organic solvent to the resin to be tested is within this range, the best balance between cost and effect can be achieved, and the resin can be processed at a low cost; and / or,

[0018] The flow rate of the organic solvent is 0.5 to 2 BV / h (bed volume / hour). When the flow rate of the organic solvent is within this range, the resin can be cleaned with a relatively small consumption.

[0019] In some embodiments, the temperature of the steam is 100-160° C. Within this temperature range, most of the volatile residues can be removed and the impurities remaining in the resin can be reduced; and / or,

[0020] The steam stripping time is 30 to 600 minutes. When the steam stripping time is within this range, most of the volatile residues can be removed and the impurity residues in the resin can be reduced.

[0021] In some embodiments, the resin to be tested is filled in a container with a height-to-diameter ratio of (1.5-4):1, and washed with water to obtain the first resin:

[0022] During water washing, the volume ratio of water to the resin to be tested is (2-10):1. Within this range, the resin can be treated to be clean; and / or,

[0023] The water flow rate during water washing is 2 to 5 BV / h. When the water flow rate during water washing is within this range, the resin can be processed to be clean.

[0024] In some embodiments, if the type of the resin to be treated is a basic anion resin, the first resin is sequentially acid washed, alkali washed, and water washed to obtain a pretreated resin having:

[0025] Acids include HCl, H 2 SO 4 At least one of the above acids can be used for pickling to effectively remove the content of metal impurities in the resin; and / or,

[0026] The molar concentration of the acid is 0.5 to 4 mol / L. Within this range, the pretreatment of the resin can be effectively achieved and metal impurities can be removed; and / or,

[0027] The volume ratio of the acid solution to the first resin during pickling is (1-5):1. When the volume ratio of the acid solution to the first resin during pickling is within this range, metal impurities can be removed within a cost-controllable range; and / or,

[0028] The alkali includes at least one of NaOH and KOH. Using at least one of the above alkalis for acid washing can remove some organic impurities; and / or,

[0029] The molar concentration of the alkali is 0.5 to 5 mol / L. Within this range, the reduction of organic extracts from the resin can be achieved within a cost-controllable range; and / or,

[0030] The volume ratio of the alkali solution to the first resin during alkali washing is (5-50):1. When the volume ratio of the alkali solution to the first resin during alkali washing is within this range, the reduction of organic extracts from the resin can be achieved within a cost-controllable range; and / or,

[0031] The conductivity of water during washing is 0.055 to 2 μS / cm. When the conductivity of water during washing is within this range, the cleaning effect of the resin can be guaranteed; and / or,

[0032] The volume ratio of water to the first resin during water washing is (50-500):1. When the volume ratio of water to the first resin during water washing is within this range, the cleaning effect of the resin can be guaranteed within a controllable cost range.

[0033] In some embodiments, if the type of the resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain the pretreated resin:

[0034] The alkali includes at least one of NaOH and KOH. Using at least one of the above alkalis for alkali washing can further reduce the residual impurities in the resin; and / or,

[0035] The molar concentration of the alkali is 0.1 to 2 mol / L. Within this range, the residual organic matter in the resin can be effectively controlled; and / or,

[0036] The volume ratio of the alkali solution to the first resin during alkali washing is (2-5):1. When the volume ratio of the alkali solution to the first resin during alkali washing is within this range, the residual organic matter in the resin can be effectively controlled within a cost-controllable range; and / or,

[0037] Acids include HCl, H 2 SO 4 At least one of the above acids can be used for pickling to effectively remove the content of metal impurities in the resin; and / or,

[0038] The molar concentration of the acid is 1 to 5 mol / L. Within this range, the content of metal impurities in the resin can be effectively removed; and / or,

[0039] The volume ratio of the acid solution to the first resin during pickling is (5-50):1. When the volume ratio of the acid solution to the first resin during pickling is within this range, the content of metal impurities in the resin can be effectively removed within a cost-controllable range; and / or,

[0040] The conductivity of the water during washing is 0.055 to 5 μS / cm. When the conductivity of the water during washing is within this range, the acid, alkali, organic matter and metal impurities remaining in the resin can be effectively removed; and / or,

[0041] The volume ratio of water to the first resin during water washing is (10-200):1. When the volume ratio of water to the first resin during water washing is within this range, the acid, alkali, organic matter and metal impurities remaining in the resin can be effectively removed within a cost-controllable range.

[0042] In some embodiments, if the type of the resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing, and alkali washing to obtain the pretreated resin:

[0043] Salt includes Na 2 SO 4 , NaCl, at least one of the above salts can remove some metal impurities in the resin; and / or,

[0044] The mass percentage of salt in the salt solution during salt washing is 1% to 20%. When the concentration of the salt solution during salt washing is within this range, some metal impurities in the resin can be removed at a controllable cost; and / or,

[0045] The volume ratio of the salt solution to the first resin during salt washing is (1-50):1. When the volume ratio of the salt solution to the first resin during salt washing is within this range, some metal impurities in the resin can be removed at a controlled cost; and / or,

[0046] Acids include HCl, H 2 SO 4 At least one of the above acids can be used for pickling to effectively remove metal impurities in the resin; and / or,

[0047] The molar concentration of the acid is 1 to 5 mol / L. Within this range, the metal impurities in the resin can be effectively removed; and / or,

[0048] The volume ratio of the acid solution to the first resin during pickling is (1-50):1. When the volume ratio of the acid solution to the first resin during pickling is within this range, metal impurities in the resin can be effectively removed under cost control; and / or,

[0049] The alkali includes at least one of NaOH and KOH. Using at least one of the above alkalis for acid washing can effectively remove organic impurities in the resin; and / or,

[0050] The molar concentration of the alkali is 0.1 to 2 mol / L. Within this range, the organic impurities in the resin can be effectively removed; and / or,

[0051] The volume ratio of the alkali solution to the first resin during alkali washing is (5-50):1. When the volume ratio of the alkali solution to the first resin during alkali washing is within this range, organic impurities in the resin can be effectively removed under controllable costs.

[0052] In some embodiments, if the type of the resin to be treated is a basic anion resin, the first resin is sequentially acid washed, alkali washed, and water washed, so that the pretreated environment in the pretreated resin is an environment isolated from carbon dioxide; and / or,

[0053] If the type of the resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing, so that the pretreated environment in the pretreated resin is an environment isolated from carbon dioxide; and / or,

[0054] If the type of the resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing, and alkali washing, so that the pretreated environment in the pretreated resin is an environment isolated from carbon dioxide.

[0055] It should be noted that the carbon dioxide-isolating environment can be an inert gas atmosphere or air from which carbon dioxide has been removed. Treatment in a carbon dioxide-isolating environment can effectively reduce the content of carbonate, bicarbonate and carbon dioxide in the resin. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0057] Economic development has put forward higher requirements on the quality of water used. For example, the demand for ultrapure water and electronic grade ultrapure water in semiconductors, integrated circuits, photovoltaics, electricity, pharmaceuticals, etc. has increased dramatically; space stations, ships, etc. also have huge demands for recycled water and drinking water treatment. The demand for high-quality water quality in these fields depends on water treatment materials. Ion exchange resins and adsorption resins are a class of materials widely used in high-quality water treatment. Among them, ion exchange resins include cation exchange resins and anion exchange resins. Since they can remove ionic substances in water, they are generally used in the preparation of deionized water and electronic grade ultrapure water; while adsorption resins are generally used to remove organic pollutants in water, and have many applications in industrial wastewater treatment, resource recovery and recycled water preparation.

[0058] However, ion exchange and adsorption resin is a kind of polymer chemical product, and its raw materials are monomers such as styrene, divinylbenzene, acrylate, methacrylate, acrylonitrile, etc. These monomers are suspended and polymerized into solid spherical particles in a dispersed phase of water and organic dispersant. Sometimes, in order to form fixed channels in polymer particles, various "pore-forming agents" such as toluene, xylene, liquid wax, solvent oil, long-chain alkanes, cycloalkanes, etc. that do not participate in the polymerization reaction are also used. These particles are then prepared into the final product through a series of reactions. In the series of reactions, sulfuric acid, sodium hydroxide, hydrochloric acid, gelatin, polyvinyl alcohol, sodium lignin sulfonate, dimethylamine, trimethylamine, chloromethyl ether, zinc chloride, ferric chloride and other raw materials are also used. Therefore, it can be seen that the prepared ion exchange or adsorption resin inevitably contains the above raw materials, oligomers, and heavy metals and organic matter introduced from raw materials, processes, and equipment. In order to reduce the release of these residual pollutants when the resin is used, it can theoretically be solved by organic solvent extraction / cleaning, hot water cleaning, and acid-base treatment. In general, water treatment applications only require 3 to 10 treatments of the above steps to meet the requirements. For high-quality water, simple treatment cannot meet the requirements, and incomplete treatment may even lead to continuous and long-term release of residues, thereby affecting the quality of the treated water.

[0059] In view of this, the present application provides a resin pretreatment method to solve the problem of continuous and long-term release of residues.

[0060] In a first aspect, the present application provides a resin pretreatment method, comprising the following steps:

[0061] Fill the resin to be tested into a container with a height-to-diameter ratio of (1.5-4):1, and wash with water to obtain a first resin;

[0062] If the type of the resin to be treated is a basic anion resin, the first resin is sequentially acid-washed, alkali-washed, and water-washed to obtain a pretreated resin;

[0063] If the type of the resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin;

[0064] If the type of the resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin.

[0065] In the present application, after washing with a container having a height-to-diameter ratio of (1.5-4):1, a suitable treatment method is selected according to the type of resin, which can reduce the carryover of residues in the resin, reduce the pollution of water by residues when treating water quality, improve the water quality of resin treatment water, and meet higher requirements. It should be noted that the height-to-diameter ratio of the treatment container will cause the contact state between the liquid and the resin, thereby affecting the cleaning effect of the resin.

[0066] In combination with the first aspect, in some embodiments provided in the present application, the step of filling the resin to be tested into a container with a height-to-diameter ratio of (1.5-4):1 and washing with water to obtain the first resin further comprises:

[0067] The resin to be tested is washed with water, filled into a cleaning container, cleaned with an organic solvent, and subjected to steam stripping treatment.

[0068] Through water washing, organic solvent washing and steam stripping treatment, most of the water-soluble residues and fat-soluble residues in the resin can be washed away, reducing the residual impurities in the resin.

[0069] In combination with the first aspect, in some embodiments provided in the present application, the number of water washings is 3 to 10 times. The more the number of water washings, the better the impurity removal effect. When the number of water washings is within this range, the residual water-soluble impurities in the resin can be reduced; and / or,

[0070] The height-to-diameter ratio of the cleaning container is (1-2): 1. When the height-to-diameter ratio of the cleaning container is within this range, the cleaning effect of the resin can be guaranteed under the condition that factors such as cost and safety are controllable.

[0071] In combination with the first aspect, in some embodiments provided in the present application, the organic solvent includes at least one of methanol, ethanol, acetone and toluene. Using at least one of the above organic solvents can effectively reduce the organic matter dissolved in the resin.

[0072] In combination with the first aspect, in some embodiments provided in the present application, during organic solvent cleaning, the volume ratio of the organic solvent to the resin to be tested is (1.5-10):1. Within this range, the volume ratio of the organic solvent to the resin to be tested can reduce the organic matter dissolved in the resin under cost-controllable conditions.

[0073] In combination with the first aspect, in some embodiments provided in the present application, the flow rate of the organic solvent is 0.5 to 2 BV / h. When the flow rate of the organic solvent is within this range, the organic matter dissolved in the resin can be reduced under cost-controllable conditions.

[0074] In combination with the first aspect, in some embodiments provided in the present application, the temperature of the steam is 100-160° C. When the temperature of the steam is within this range, most of the volatile residues can be removed and the impurity residues in the resin can be reduced.

[0075] In combination with the first aspect, in some embodiments provided in the present application, the steam stripping time is 30 to 600 minutes. When the steam stripping time is within this range, most of the volatile residues can be removed and the impurity residues in the resin can be reduced.

[0076] In combination with the first aspect, in some embodiments provided in the present application, the resin to be tested is filled in a container with a height-to-diameter ratio of (1.5-4):1, and washed with water to obtain a first resin: the volume ratio of water to the resin to be tested during water washing is (2-10):1. When the volume ratio of water to the resin to be tested is within this range, organic and inorganic impurities in the water can be further removed.

[0077] In combination with the first aspect, in some embodiments provided in the present application, the resin to be tested is filled in a container with a height-to-diameter ratio of (1.5 to 4):1, and washed with water to obtain a first resin: the water flow rate during washing is 2 to 5 BV / h. The water flow rate during washing is within this range, which can further remove organic and inorganic impurities in the water.

[0078] In combination with the first aspect, in some embodiments provided in the present application, if the type of the resin to be treated is a basic anion resin, the first resin is sequentially acid washed, alkali washed, and water washed to obtain a pretreated resin in which: the acid includes HCl, H 2 SO 4 At least one of the above acids can be used for pickling to effectively remove metal impurities in the resin.

[0079] In combination with the first aspect, in some embodiments provided in the present application, if the type of resin to be treated is an alkaline anion resin, the first resin is sequentially acid washed, alkali washed, and water washed to obtain a pretreated resin in which: the molar concentration of the acid is 0.5 to 4 mol / L. Within this range, the molar concentration of the acid can effectively remove metal impurities in the resin under cost-controllable conditions.

[0080] In combination with the first aspect, in some embodiments provided in the present application, if the type of resin to be treated is an alkaline anion resin, the first resin is sequentially acid washed, alkali washed, and water washed to obtain a pretreated resin: the volume ratio of the acid solution to the first resin during acid washing is (1 to 5): 1. When the volume ratio of the acid solution to the first resin during acid washing is within this range, the metal impurities in the resin can be effectively removed under cost-controllable conditions.

[0081] In combination with the first aspect, in some embodiments provided in the present application, if the type of resin to be treated is an alkaline anion resin, the first resin is sequentially acid washed, alkali washed, and water washed to obtain a pretreated resin: the alkali includes at least one of NaOH and KOH, and the use of at least one of the above-mentioned alkalis for alkali washing can effectively remove organic impurities in the resin.

[0082] In combination with the first aspect, in some embodiments provided in the present application, if the type of resin to be treated is an alkaline anion resin, the first resin is sequentially acid washed, alkali washed, and water washed to obtain a pretreated resin in which: the molar concentration of the alkali is 0.5 to 5 mol / L. Within this range, the molar concentration of the alkali can effectively remove organic impurities in the resin within a cost-controllable range.

[0083] In combination with the first aspect, in some embodiments provided in the present application, if the type of resin to be treated is an alkaline anion resin, the first resin is sequentially acid washed, alkali washed, and water washed to obtain a pretreated resin: the volume ratio of the alkali solution to the first resin during alkali washing is (5 to 50): 1. The volume ratio of the alkali solution to the first resin during alkali washing is within this range, and the organic impurities in the resin can be effectively removed within a cost-controllable range.

[0084] In combination with the first aspect, in some embodiments provided in the present application, if the type of resin to be treated is an alkaline anion resin, the first resin is sequentially acid washed, alkali washed, and water washed to obtain a pretreated resin: the conductivity of water during water washing is 0.055 to 2 μS / cm. The conductivity of water during water washing is within this range, which can further reduce various impurities in the resin.

[0085] In combination with the first aspect, in some embodiments provided in the present application, if the type of resin to be treated is an alkaline anion resin, the first resin is sequentially acid washed, alkali washed, and water washed to obtain a pretreated resin: the volume ratio of water to the first resin during water washing is (50 to 500): 1. The volume ratio of water to the first resin during water washing is within this range, which can further reduce various impurities in the resin within a controllable cost range.

[0086] In combination with the first aspect, in some embodiments provided in the present application, if the type of resin to be treated is a strongly acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin: the alkali includes at least one of NaOH and KOH, and the use of at least one of the above-mentioned alkalis for alkali washing can effectively remove organic impurities in the resin.

[0087] In combination with the first aspect, in some embodiments provided in the present application, if the type of resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin in which: the molar concentration of the alkali is 0.1 to 2 mol / L. Within this range, the molar concentration of the alkali can effectively remove organic impurities in the resin within a cost-controllable range.

[0088] In combination with the first aspect, in some embodiments provided in the present application, if the type of resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin: the volume ratio of the alkali solution to the first resin during alkali washing is (2 to 5): 1. The volume ratio of the alkali solution to the first resin during alkali washing is within this range, and the organic impurities in the resin can be effectively removed within a cost-controllable range.

[0089] In combination with the first aspect, in some embodiments provided in the present application, if the type of the resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin in which: the acid comprises HCl, H 2 SO 4 At least one of the above acids can be used for pickling to effectively remove metal impurities in the resin.

[0090] In combination with the first aspect, in some embodiments provided in the present application, if the type of resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin in which: the molar concentration of the acid is 1 to 5 mol / L. Within this range, the molar concentration of the acid can effectively remove metal impurities in the resin under cost-controllable conditions.

[0091] In combination with the first aspect, in some embodiments provided in the present application, if the type of resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin: the volume ratio of the acid solution to the first resin during acid washing is (5 to 50): 1. When the volume ratio of the acid solution to the first resin during acid washing is within this range, the metal impurities in the resin can be effectively removed under cost-controllable conditions.

[0092] In combination with the first aspect, in some embodiments provided in the present application, if the type of resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin: the conductivity of water during water washing is 0.055 to 5 μS / cm. When the conductivity of water during water washing is within this range, various impurities in the resin can be further removed.

[0093] In combination with the first aspect, in some embodiments provided in the present application, if the type of resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin: the volume ratio of water to the first resin during water washing is (10 to 200): 1. When the volume ratio of water to the first resin during water washing is within this range, various impurities in the resin can be further removed under cost-controllable conditions.

[0094] In combination with the first aspect, in some embodiments provided in the present application, if the type of the resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin in which: the salt includes Na 2 SO 4 , at least one of NaCl, using at least one of the above salts can remove some metal and organic impurities in the resin.

[0095] In combination with the first aspect, in some embodiments provided in the present application, if the type of resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin: the mass proportion of salt in the salt solution during salt washing is 1% to 20%, and the concentration of the salt solution during salt washing is within this range, which can effectively remove some metal and organic impurities in the resin.

[0096] In combination with the first aspect, in some embodiments provided in the present application, if the type of resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin: the volume ratio of the salt solution to the first resin during salt washing is (1 to 50): 1, and the volume ratio of the salt solution to the first resin during salt washing is within this range, which can effectively remove some metal and organic impurities in the resin within a cost-controllable range.

[0097] In combination with the first aspect, in some embodiments provided in the present application, if the type of the resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin in which: the acid comprises HCl, H 2 SO 4 At least one of the above acids can be used for pickling to effectively remove metal impurities in the resin.

[0098] In combination with the first aspect, in some embodiments provided in the present application, if the type of resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin in which: the molar concentration of the acid is 1 to 5 mol / L. Within this range, the molar concentration of the acid can effectively remove metal impurities in the resin within a cost-controllable range.

[0099] In combination with the first aspect, in some embodiments provided in the present application, if the type of resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin: the volume ratio of the acid solution to the first resin during acid washing is (1 to 50): 1. The volume ratio of the acid solution to the first resin during acid washing is within this range, and the metal impurities in the resin can be effectively removed within a cost-controllable range.

[0100] In combination with the first aspect, in some embodiments provided in the present application, if the type of resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin: the alkali includes at least one of NaOH and KOH, and the use of at least one of the above-mentioned alkalis for alkali washing can effectively remove organic impurities in the resin.

[0101] In combination with the first aspect, in some embodiments provided in the present application, if the type of resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin in which: the molar concentration of the alkali is 0.1 to 2 mol / L. The molar concentration of the alkali within this range can effectively remove organic impurities in the resin.

[0102] In combination with the first aspect, in some embodiments provided in the present application, if the type of resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin: the volume ratio of the alkali solution to the first resin during alkali washing is (5 to 50): 1. The volume ratio of the alkali solution to the first resin during alkali washing is within this range, which can effectively remove organic impurities in the resin while keeping the cost under control.

[0103] In combination with the first aspect, in some embodiments provided in the present application, if the type of the resin to be treated is an alkaline anion resin, the first resin is sequentially acid washed, alkali washed, and water washed, so that the pretreated environment in the pretreated resin is an environment isolated from carbon dioxide.

[0104] In combination with the first aspect, in some embodiments provided in the present application, if the type of the resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing, so that the pretreated environment in the pretreated resin is an environment isolated from carbon dioxide.

[0105] In combination with the first aspect, in some embodiments provided in the present application, if the type of the resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing, and alkali washing, so that the pretreated environment in the pretreated resin is an environment isolated from carbon dioxide.

[0106] It should be noted that the carbon dioxide-isolating environment can be an inert gas atmosphere or air from which carbon dioxide has been removed. Treatment in a carbon dioxide-isolating environment can effectively reduce the content of carbonate, bicarbonate and carbon dioxide in the resin.

[0107] The technical solution provided by the present application is described in detail below in conjunction with the embodiments. All operations of Examples 1 to 15 are performed under a nitrogen atmosphere.

[0108] Example 1

[0109] Example 1 of the present application provides a resin pretreatment method for a strong acid cation exchange resin, comprising the following steps:

[0110] After washing with water for 3 times, the resin was loaded into a reactor with a height-to-diameter ratio of 1:1; methanol with a volume ratio of 4 times the volume of the resin (volume ratio) was introduced into the fixed bed or reactor at a flow rate of 0.5 BV / h; 100°C steam was used to blow off the above reactor for 30 minutes; the resin was then loaded into a fixed bed with a height-to-diameter ratio of 1.5:1, and the resin was washed with water with a volume of 2 times the volume of the resin at a flow rate of 2 BV / h (bed volume / hour);

[0111] NaOH aqueous solution, HCl aqueous solution and pure water were used for cleaning in sequence. The concentration of NaOH aqueous solution was 0.1 mol / L, and its dosage was 2 times the volume of the resin (volume multiple), the concentration of HCl aqueous solution was 1 mol / L, and its dosage was 10 times the volume of the resin (volume multiple), and the conductivity of pure water was 0.1 μS / cm, and its dosage was 20 times the volume of the resin (volume multiple).

[0112] Example 2

[0113] Example 2 of the present application provides a resin pretreatment method, which is a strong acid cation exchange resin, comprising the following steps:

[0114] After washing with water for 5 times, the resin was loaded into a fixed bed with a height-to-diameter ratio of 2:1; acetone with a volume ratio of 1.5 times (volume ratio) of the resin was introduced into the fixed bed at a flow rate of 1 BV / h; 100°C steam was used to blow off the above reactor for 90 minutes; the resin was loaded into a fixed bed with a height-to-diameter ratio of 2:1, and the resin was washed with water with a volume of 5 times the resin at a flow rate of 3 BV / h (bed volume / hour).

[0115] NaOH aqueous solution, HCl aqueous solution and pure water were used for cleaning in sequence. The concentration of NaOH aqueous solution was 0.5 mol / L, and its dosage was 3 times the volume of the resin (volume multiple), and the concentration of HCl aqueous solution was 2 mol / L, and its dosage was 5 times the volume of the resin (volume multiple). The conductivity of pure water used was 0.055 μS / cm, and its dosage was 50 times the volume of the resin (volume multiple).

[0116] Example 3

[0117] Example 3 of the present application provides a resin pretreatment method, a strong acid cation exchange resin, comprising the following steps:

[0118] After washing with water for 8 times, the mixture was loaded into a reactor with a height-to-diameter ratio of 2:1; ethanol in an amount 8 times the volume of the resin (volume ratio) was introduced into the reactor at a flow rate of 1.5 BV / h; 120°C steam was used to blow off the above reactor for 150 minutes; the resin was loaded into a fixed bed with a height-to-diameter ratio of 2:1, and the resin was washed with water in an amount 8 times the volume of the resin at a flow rate of 4 BV / h (bed volume / hour).

[0119] NaOH aqueous solution, HCl aqueous solution and pure water were used for cleaning in sequence. The concentration of NaOH aqueous solution was 1 mol / L, and its dosage was 4 times the volume of the resin (volume multiple), and the concentration of HCl aqueous solution was 4 mol / L, and its dosage was 20 times the volume of the resin (volume multiple). The conductivity of pure water used was 0.5 μS / cm, and its dosage was 20 times the volume of the resin (volume multiple).

[0120] Example 4

[0121] Example 4 of the present application provides a resin pretreatment method, a strong acid cation exchange resin, comprising the following steps:

[0122] After washing with water for 10 times, the resin was loaded into a fixed bed with a height-to-diameter ratio of 2:1; methanol with a volume 10 times that of the resin (volume ratio) was introduced into the fixed bed at a flow rate of 2BV / h; 140°C steam was used to blow off the above reactor for 180 minutes; the resin was loaded into a fixed bed with a height-to-diameter ratio of 2.5:1, and the resin was washed with water with a volume 10 times that of the resin at a flow rate of 5BV / h (bed volume / hour).

[0123] NaOH aqueous solution, HCl aqueous solution and pure water were used for cleaning in sequence. The concentration of NaOH aqueous solution was 2 mol / L, and its dosage was 5 times the volume of the resin (volume multiple), and the concentration of HCl aqueous solution was 3 mol / L, and its dosage was 30 times the volume of the resin (volume multiple). The conductivity of pure water used was 1 μS / cm, and its dosage was 50 times the volume of the resin (volume multiple).

[0124] Example 5

[0125] Example 5 of the present application provides a resin pretreatment method, a strong acid cation exchange resin, comprising the following steps:

[0126] After washing with water three times, the resin was loaded into a fixed bed with a height-to-diameter ratio of 2:1; toluene with a volume ratio of 5 times that of the resin (volume ratio) was introduced into the fixed bed at a flow rate of 1.2 BV / h; 160°C steam was used to blow off the above reaction kettle for 300 min; the resin was loaded into a fixed bed with a height-to-diameter ratio of 3:1, and the resin was washed with water with a volume of 10 times that of the resin at a flow rate of 5 BV / h (bed volume / hour).

[0127] NaOH aqueous solution, HCl aqueous solution and pure water were used for cleaning in sequence. The concentration of NaOH aqueous solution was 2 mol / L, and its dosage was 5 times the volume of the resin (volume multiple), and the concentration of HCl aqueous solution was 5 mol / L, and its dosage was 10 times the volume of the resin (volume multiple). The conductivity of pure water used was 2 μS / cm, and its dosage was 100 times the volume of the resin (volume multiple).

[0128] Example 6

[0129] Example 6 of the present application provides a resin pretreatment method, a strong acid cation exchange resin, comprising the following steps:

[0130] After washing with water for 6 times, the mixture was loaded into a fixed bed with a height-to-diameter ratio of 2:1; toluene with a volume 5 times that of the resin (volume ratio) was introduced into the fixed bed at a flow rate of 1.2 BV / h; 130°C steam was used to blow off the above reactor for 240 min; the resin was loaded into a reactor with a height-to-diameter ratio of 3:1, and the resin was washed with water with a volume 10 times that of the resin at a flow rate of 5 BV / h (bed volume / hour).

[0131] NaOH aqueous solution, HCl aqueous solution and pure water were used for cleaning in sequence. The concentration of NaOH aqueous solution was 2 mol / L, and its dosage was 5 times the volume of the resin (volume multiple), and the concentration of HCl aqueous solution was 5 mol / L, and its dosage was 10 times the volume of the resin (volume multiple). The conductivity of pure water used was 3 μS / cm, and its dosage was 80 times the volume of the resin (volume multiple).

[0132] Example 7

[0133] Example 7 of the present application provides a resin pretreatment method, a strong acid cation exchange resin, comprising the following steps:

[0134] After washing with water for 4 times, the resin was loaded into a fixed bed with a height-to-diameter ratio of 2:1; methanol with a volume 5 times that of the resin (volume ratio) was introduced into the fixed bed at a flow rate of 1.2 BV / h; 110°C steam was used to blow off the above reactor for 600 min; the resin was loaded into a reactor with a height-to-diameter ratio of 4:1, and the resin was washed with water with a volume 10 times that of the resin at a flow rate of 5 BV / h (bed volume / hour).

[0135] NaOH aqueous solution, HCl aqueous solution and pure water were used for cleaning in sequence. The concentration of NaOH aqueous solution was 2 mol / L, and its dosage was 5 times the volume of the resin (volume multiple), and the concentration of HCl aqueous solution was 5 mol / L, and its dosage was 10 times the volume of the resin (volume multiple). The conductivity of pure water used was 5 μS / cm, and its dosage was 150 times the volume of the resin (volume multiple).

[0136] Example 8

[0137] Example 8 of the present application provides a resin pretreatment method, a strong acid cation exchange resin, comprising the following steps:

[0138] After washing with water three times, the resin was loaded into a fixed bed with a height-to-diameter ratio of 2:1; ethanol with a volume ratio of 5 times the resin (volume ratio) was introduced into the fixed bed at a flow rate of 1 BV / h; 120°C steam was used to blow off the above reactor for 240 minutes; the resin was loaded into a reactor with a height-to-diameter ratio of 3:1, and the resin was washed with water with a volume of 10 times the resin at a flow rate of 2 BV / h (bed volume / hour).

[0139] NaOH aqueous solution, HCl aqueous solution and pure water were used for cleaning in sequence. The concentration of NaOH aqueous solution was 3 mol / L, and its dosage was 2 times the volume of the resin (volume multiple), and the concentration of HCl aqueous solution was 5 mol / L, and its dosage was 50 times the volume of the resin (volume multiple). The conductivity of pure water used was 1 μS / cm, and its dosage was 200 times the volume of the resin (volume multiple).

[0140] Example 9

[0141] Example 9 of the present application provides a resin pretreatment method, a strong base anion exchange resin, comprising the following steps:

[0142] After washing with water for 3 times, the resin was loaded into a reactor with a height-to-diameter ratio of 1:1; methanol with a volume 4 times that of the resin (volume ratio) was introduced into the fixed bed or reactor at a flow rate of 0.5 BV / h; 100°C steam was used to blow off the above reactor for 30 minutes; the resin was loaded into a fixed bed with a height-to-diameter ratio of 1.5:1, and the resin was washed with water with a volume 2 times that of the resin at a flow rate of 2 BV / h (bed volume / hour).

[0143] Use HCl aqueous solution, NaOH aqueous solution and pure water for cleaning in sequence. The concentration of HCl aqueous solution is 4 mol / L, and its dosage is 1 times the volume of the resin (volume multiple); the concentration of NaOH aqueous solution is 5 mol / L, and its dosage is 5 times the volume of the resin (volume multiple). The conductivity of the pure water used is 0.1 μS / cm, and its dosage is 100 times the volume of the resin (volume multiple).

[0144] Example 10

[0145] Example 10 of the present application provides a resin pretreatment method, a strong base anion exchange resin, comprising the following steps:

[0146] After washing with water for 5 times, the resin was loaded into a fixed bed with a height-to-diameter ratio of 2:1; acetone with a volume ratio of 1.5 times (volume ratio) of the resin was introduced into the fixed bed at a flow rate of 1 BV / h; 100°C steam was used to blow off the above reactor for 90 minutes; the resin was loaded into a fixed bed with a height-to-diameter ratio of 2:1, and the resin was washed with water with a volume of 5 times the resin at a flow rate of 3 BV / h (bed volume / hour).

[0147] Use HCl aqueous solution, NaOH aqueous solution and pure water for cleaning in sequence. The concentration of HCl aqueous solution is 3 mol / L, and its dosage is 2 times the volume of the resin (volume multiple); the concentration of NaOH aqueous solution is 3 mol / L, and its dosage is 10 times the volume of the resin (volume multiple). The conductivity of the pure water used is 0.2 μS / cm, and its dosage is 200 times the volume of the resin (volume multiple).

[0148] Embodiment 11

[0149] Example 11 of the present application provides a resin pretreatment method, a strong base anion exchange resin, comprising the following steps:

[0150] After washing with water for 8 times, the mixture was loaded into a reactor with a height-to-diameter ratio of 2:1; ethanol in an amount 8 times the volume of the resin (volume ratio) was introduced into the reactor at a flow rate of 1.5 BV / h; 120°C steam was used to blow off the above reactor for 150 minutes; the resin was loaded into a fixed bed with a height-to-diameter ratio of 2:1, and the resin was washed with water in an amount 8 times the volume of the resin at a flow rate of 4 BV / h (bed volume / hour).

[0151] Use HCl aqueous solution, NaOH aqueous solution and pure water for cleaning in sequence. The concentration of HCl aqueous solution is 2 mol / L, and its dosage is 4 times the volume of the resin (volume multiple); the concentration of NaOH aqueous solution is 2 mol / L, and its dosage is 20 times the volume of the resin (volume multiple). The conductivity of pure water used is 1 μS / cm, and its dosage is 400 times the volume of the resin (volume multiple).

[0152] Example 12

[0153] Example 12 of the present application provides a resin pretreatment method, a strong base anion exchange resin, comprising the following steps:

[0154] After washing with water for 10 times, the resin was loaded into a fixed bed with a height-to-diameter ratio of 2:1; methanol with a volume 10 times that of the resin (volume ratio) was introduced into the fixed bed at a flow rate of 2BV / h; 140°C steam was used to blow off the above reactor for 180 minutes; the resin was loaded into a fixed bed with a height-to-diameter ratio of 2.5:1, and the resin was washed with water with a volume 10 times that of the resin at a flow rate of 5BV / h (bed volume / hour).

[0155] Use HCl aqueous solution, NaOH aqueous solution and pure water for cleaning in sequence. The concentration of HCl aqueous solution is 1 mol / L, and its dosage is 3 times the volume of the resin (volume multiple); the concentration of NaOH aqueous solution is 1 mol / L, and its dosage is 30 times the volume of the resin (volume multiple). The conductivity of pure water used is 2 μS / cm, and its dosage is 500 times the volume of the resin (volume multiple).

[0156] Embodiment 13

[0157] Example 13 of the present application provides a resin pretreatment method, a strong base anion exchange resin, comprising the following steps:

[0158] After washing with water for 10 times, the resin was loaded into a fixed bed with a height-to-diameter ratio of 2:1; methanol with a volume 10 times that of the resin (volume ratio) was introduced into the fixed bed at a flow rate of 2BV / h; 140°C steam was used to blow off the above reactor for 180 minutes; the resin was loaded into a fixed bed with a height-to-diameter ratio of 2.5:1, and the resin was washed with water with a volume 10 times that of the resin at a flow rate of 5BV / h (bed volume / hour).

[0159] HCl aqueous solution, NaOH aqueous solution and pure water were used for cleaning in sequence. The concentration of HCl aqueous solution was 0.5 mol / L, and its dosage was 5 times the volume of the resin (volume multiple); the concentration of NaOH aqueous solution was 0.5 mol / L, and its dosage was 50 times the volume of the resin (volume multiple). The conductivity of pure water used was 0.055 μS / cm, and its dosage was 300 times the volume of the resin (volume multiple).

[0160] Embodiment 14

[0161] Example 14 of the present application provides a resin pretreatment method, a macroporous adsorption resin, comprising the following steps:

[0162] After washing with water for 5 times, the resin was loaded into a fixed bed with a height-to-diameter ratio of 2:1. Methanol with a volume ratio of 10 times the resin volume (volume ratio) was introduced into the fixed bed at a flow rate of 1 BV / h. Steam at 150°C was used to blow off the above reactor for 200 minutes. The resin was washed with water with a volume of 10 times the resin volume at a flow rate of 5 BV / h (bed volume / hour).

[0163] Use Na 2 SO 4 The resin was washed with 10 times the volume of aqueous solution (1 mol / L), HCl aqueous solution (1 mol / L), and NaOH aqueous solution (1 mol / L). After washing, it was washed with pure water. The conductivity of the pure water used was 5 μS / cm, and the amount used was 400 times the volume of the resin (volume multiple).

[0164] Embodiment 15

[0165] Example 15 of the present application provides a resin pretreatment method, a macroporous adsorption resin, comprising the following steps:

[0166] After washing with water for 6 times, the resin was loaded into a fixed bed with a height-to-diameter ratio of 2:1; ethanol with a volume ratio of 8 times the volume of the resin (volume ratio) was introduced into the fixed bed at a flow rate of 1 BV / h; 130°C steam was used to blow off the above reactor for 300 minutes. The resin was washed with water with a volume of 8 times the volume of the resin at a flow rate of 2 BV / h (bed volume / hour).

[0167] NaOH aqueous solution (1 mol / L), HCl aqueous solution (2 mol / L), Na 2 SO 4 The resin was washed with 10 times the volume of an aqueous solution (1 mol / L). After washing, it was rinsed with pure water. The conductivity of the pure water used was 0.5 μS / cm, and the amount used was 500 times the volume of the resin (volume multiple).

[0168] Comparative Example 1

[0169] Comparative Example 1 of the present application provides a resin pretreatment method, which differs from Example 1 in that the resin to be tested is filled in a container with a height-to-diameter ratio of 1:1.

[0170] Comparative Example 2

[0171] Comparative Example 2 of the present application provides a resin pretreatment method, which differs from Example 1 in that the resin to be tested is filled in a container with a height-to-diameter ratio of 6:1.

[0172] Comparative Example 3

[0173] Comparative Example 1 of the present application provides a resin pretreatment method, which differs from Example 9 in that the resin to be tested is filled in a container with a height-to-diameter ratio of 1:1.

[0174] Comparative Example 4

[0175] Comparative Example 2 of the present application provides a resin pretreatment method, which differs from Example 9 in that the resin to be tested is filled in a container with a height-to-diameter ratio of 6:1.

[0176] Comparative Example 5

[0177] Comparative Example 5 of the present application does not have any resin pretreatment method, and its resin type is the same as that of Example 1.

[0178] Comparative Example 6

[0179] Comparative Example 6 of the present application does not have a resin pretreatment method, and its resin type is the same as that of Example 9.

[0180] Performance Testing

[0181] The resins obtained by the resin pretreatment methods of Examples 1 to 15 and Comparative Examples 1 to 6 were subjected to impurity residual tests. The specific test methods were DL / T 1077-2018 method for determining organic extracts from ion exchange resins and NB / T 25097-2018 method for determining the content of metal impurities in ion exchange resins for nuclear power plants. The test results are shown in Table 1.

[0182] Table 1 Performance test results of resin pretreatment methods of Examples 1 to 15 and Comparative Examples 1 to 6 (unit: mg / kg dry resin)

[0183]

[0184] As shown in Table 1, the content of most impurity ions in Comparative Example 1 is too high due to the small aspect ratio. The cost of Comparative Example 2 is increased sharply due to the large aspect ratio, which is about 30% higher than that of Example 1.

[0185] Since the aspect ratio of Comparative Example 3 is too small, the content of most impurity ions is relatively high.

[0186] Since the aspect ratio of comparative example 4 is too large, the cost increases sharply, and the cost increases by about 65% compared with that of example 9.

[0187] Since the resin in Comparative Example 5 was not pretreated, the content of all impurities was relatively high.

[0188] Since the resin in Comparative Example 6 was not pretreated, the content of all impurities was relatively high.

[0189] In summary, after washing with a container with a height-to-diameter ratio of (1.5-4):1, choosing a suitable treatment method according to the type of resin can reduce the carryover of residues in the resin, reduce the pollution of water by residues during water treatment, improve the water quality of resin treatment water, and meet higher requirements. It should be noted that the height-to-diameter ratio of the treatment container affects the contact state between the resin particles and water, thereby affecting the residues of the resin.

[0190] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments / methods or examples. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0191] It should be noted that, in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the sentence "comprise one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. In the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically stipulated.

[0192] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A resin pretreatment method, characterized in that: The following steps are involved: Fill the resin to be tested into a container with a height-to-diameter ratio of (1.5-4):1, and wash with water to obtain a first resin; If the type of the resin to be treated is a basic anion resin, the first resin is sequentially acid-washed, alkali-washed, and water-washed to obtain a pretreated resin; If the type of the resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin; If the type of the resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin.

2. The resin pretreatment method according to claim 1, characterized in that: The method further comprises: filling the resin to be tested into a container with a height-to-diameter ratio of (1.5-4):1, washing with water, and obtaining the first resin. The resin to be tested is washed with water, filled into a cleaning container, cleaned with an organic solvent, and subjected to steam stripping treatment.

3. The resin pretreatment method according to claim 2, characterized in that: The number of times of washing is 3 to 10 times; and / or, The height-to-diameter ratio of the cleaning container is (1-2):

1.

4. The resin pretreatment method according to claim 2, characterized in that: The organic solvent comprises at least one of methanol, ethanol, acetone and toluene; and / or, When cleaning with an organic solvent, the volume ratio of the organic solvent to the resin to be tested is (1.5-10):1; and / or, The flow rate of the organic solvent is 0.5-2 BV / h.

5. The resin pretreatment method according to claim 2, characterized in that: The temperature of the steam is 100 to 160°C; and / or, The steam stripping time is 30 to 600 minutes.

6. The resin pretreatment method according to claim 1, characterized in that: The resin to be tested is filled into a container with a height-to-diameter ratio of (1.5-4):1, and washed with water to obtain the first resin: During water washing, the volume ratio of water to the resin to be tested is (2-10):1; and / or, The water flow rate during water washing is 2 to 5 BV / h.

7. The resin pretreatment method according to claim 1, characterized in that: If the type of the resin to be treated is a basic anion resin, the first resin is sequentially acid washed, alkali washed, and water washed to obtain the pretreated resin: The acid comprises at least one of HCl and H2SO4; and / or, The molar concentration of the acid is 0.5 to 4 mol / L; and / or, During pickling, the volume ratio of the acid solution to the first resin is (1-5):1; and / or, The base comprises at least one of NaOH and KOH; and / or, The molar concentration of the base is 0.5 to 5 mol / L; and / or, During alkali washing, the volume ratio of the alkali solution to the first resin is (5-50):1; and / or, The conductivity of the water during washing is 0.055 to 2 μS / cm; and / or, During water washing, the volume ratio of water to the first resin is (50-500):

1.

8. The resin pretreatment method according to claim 1, characterized in that: If the type of the resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain the pretreated resin: The base comprises at least one of NaOH and KOH; and / or, The molar concentration of the base is 0.1 to 2 mol / L; and / or, During alkali washing, the volume ratio of the alkali solution to the first resin is (2-5):1; and / or, The acid comprises at least one of HCl and H2SO4; and / or, The molar concentration of the acid is 1 to 5 mol / L; and / or, During pickling, the volume ratio of the acid solution to the first resin is (5-50):1; and / or, The conductivity of the water during washing is 0.055 to 5 μS / cm; and / or, During water washing, the volume ratio of water to the first resin is (10-200):

1.

9. The resin pretreatment method according to claim 1, characterized in that: If the type of the resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin: The salt comprises at least one of Na2SO4 and NaCl; and / or During salt washing, the mass percentage of salt in the salt solution is 1% to 20%; and / or, During salt washing, the volume ratio of the salt solution to the first resin is (1-50):1; and / or, The acid comprises at least one of HCl and H2SO4; and / or, The molar concentration of the acid is 1 to 5 mol / L; and / or, During pickling, the volume ratio of the acid solution to the first resin is (1-50):1; and / or, The base comprises at least one of NaOH and KOH; and / or, The molar concentration of the base is 0.1 to 2 mol / L; and / or, During alkali washing, the volume ratio of the alkali solution to the first resin is (5-50):

1.

10. The resin pretreatment method according to claim 1, characterized in that: If the type of the resin to be treated is a basic anion resin, the first resin is sequentially acid-washed, alkali-washed, and water-washed to obtain a pre-treated resin in an environment that is isolated from carbon dioxide; and / or, If the type of the resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing, so that the pretreated environment in the pretreated resin is an environment isolated from carbon dioxide; and / or, If the type of the resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing, and alkali washing, so that the pretreated environment in the pretreated resin is an environment isolated from carbon dioxide.

Images