阅读说明：本技术 一种用于蒽醌法制备双氧水工作液的再生剂及其应用 (Regenerant for preparing hydrogen peroxide working solution by anthraquinone process and application thereof ) 是由 史振宇 孙小惠 张旭旺 王炳春 李进 王贤彬 于 2020-12-08 设计创作，主要内容包括：本发明公开了一种用于蒽醌法制备双氧水工作液的再生剂及其应用。该再生剂是利用稀土溶液对分子筛进行离子交换焙烧后制备而成,其中分子筛类型为13X型分子筛、NaY型分子筛。本发明是通过对X型分筛或Y型分子筛进行稀土改性,得到再生剂。经稀土改性可以稳定分子筛的骨架结构,提高分子筛的稳定性和催化性能,此外稀土元素可提供较多的活性位,进而提高分子筛的活性。本发明的再生剂能够对蒽醌法制备双氧水工作液实现再生,提高其工作液中的EAQ和H4EAQ浓度。(The invention discloses a regenerant for preparing hydrogen peroxide working solution by an anthraquinone process and application thereof. The regenerant is prepared by ion exchange roasting of a molecular sieve by using a rare earth solution, wherein the molecular sieve is 13X type molecular sieve or NaY type molecular sieve. The invention obtains the regenerant by carrying out rare earth modification on an X-type screening or a Y-type molecular sieve. The rare earth modification can stabilize the framework structure of the molecular sieve, improve the stability and catalytic performance of the molecular sieve, and in addition, the rare earth element can provide more active sites, thereby improving the activity of the molecular sieve. The regenerant can regenerate hydrogen peroxide working solution prepared by an anthraquinone method and improve the concentration of EAQ and H4EAQ in the working solution.)

1. The regenerant for preparing the hydrogen peroxide working solution by the anthraquinone process is characterized by being prepared by carrying out ion exchange roasting on a molecular sieve by utilizing a rare earth solution, wherein the molecular sieve is a formed 13X-type molecular sieve or a formed NaY-type molecular sieve.

2. The regenerant for preparing hydrogen peroxide working solution according to the anthraquinone process, wherein the molecular sieve needs to be pretreated before being modified by using rare earth solution.

3. The regenerant for preparing hydrogen peroxide working solution according to claim 2, wherein the pretreatment method of the molecular sieve comprises the following steps of mixing the molecular sieve with 10% ammonium salt solution according to a ratio of 1: 5, treating at 90 ℃ for 3h, filtering, washing and drying.

4. The regenerant for preparing hydrogen peroxide working solution according to claim 1, wherein the rare earth element in said rare earth solution is at least one of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium, and the rare earth element in said regenerant is 1-10 wt%.

5. The regenerant for preparing the hydrogen peroxide working solution by the anthraquinone process according to claim 4, wherein rare earth elements in the rare earth solution are lanthanum, cerium, praseodymium and neodymium, and the content of the rare earth elements in the regenerant is 4-6 wt%.

6. The regenerant for preparing the hydrogen peroxide working solution by the anthraquinone process according to claim 2, wherein the ion exchange roasting is carried out by mixing a molecular sieve with a rare earth solution according to a mass ratio of 1: 3-8, then carrying out ion exchange, filtering, washing, drying and roasting.

7. The regenerant for preparing the hydrogen peroxide working solution by the anthraquinone process according to claim 6, wherein the ion exchange temperature is 50-90 ℃, and the ion exchange time is 2-6 h; the filtering mode is filter pressing, the number of times of alcohol washing is 3, the drying temperature is 80-130 ℃, and the time is 2-8 h.

8. The regenerant for preparing the hydrogen peroxide working solution by the anthraquinone process as claimed in claim 7, wherein the calcination temperature is 450-600 ℃, and the calcination time is 4-10 h.

9. An application method of the regenerant according to any one of claims 1 to 8, wherein the regenerant is used for regenerating hydrogen peroxide working solution prepared by an anthraquinone process, the application method is that the regenerant is mixed with the hydrogenated and degraded anthraquinone hydrogen peroxide working solution and reacts for 6 hours at the temperature of 50 ℃, and the mass ratio of the regenerant to the hydrogenated and degraded anthraquinone hydrogen peroxide working solution is 1: 20.

Technical Field

The invention relates to a regenerant for preparing hydrogen peroxide working solution by an anthraquinone process and application thereof.

Background

The hydrogen peroxide is a strong oxidant, is an inorganic chemical raw material with high industrial application value, is widely applied to the fields of industry, medicine, military use and the like, and is green. Therefore, the demand of hydrogen peroxide is increasing day by day, and the synthesis process of hydrogen peroxide is widely researched in order to meet the huge market demand. The existing hydrogen peroxide preparation methods include anthraquinone method and direct hydrogen-oxygen synthesis method. The principle of anthraquinone method for industrially producing hydrogen peroxide is that alkyl anthraquinone is dissolved into working solution, hydrogenation reaction is carried out under the catalytic action of a catalyst taking nickel or palladium as an active component to generate alkyl anthraquinone, then the working solution containing the alkyl anthraquinone is oxidized to generate hydrogen peroxide and the alkyl anthraquinone, and then the working solution is extracted to obtain hydrogen peroxide solution and the working solution. The principle of the direct hydrogen-oxygen combination method is that a reaction medium and a catalyst are added into a high-pressure reactor, a mixed gas of hydrogen, oxygen and nitrogen in a certain proportion is introduced under the condition of continuous stirring, and the hydrogen peroxide can be generated through reaction at a certain temperature and under a certain pressure. The direct hydrogen-oxygen synthesis method has the defects of low product content and harsh conditions, and uses the mixed gas of hydrogen and oxygen, so the mixed gas has high risk, and the anthraquinone method is often selected industrially to prepare the hydrogen peroxide.

The principle of anthraquinone method for industrially producing hydrogen peroxide is that alkyl anthraquinone is dissolved into working solution, hydrogenation reaction is carried out under the catalytic action of a catalyst taking nickel or palladium as an active component to generate alkyl anthraquinone, then the working solution containing the alkyl anthraquinone is oxidized to generate hydrogen peroxide and the alkyl anthraquinone, and then the working solution is extracted to obtain hydrogen peroxide solution and the working solution. The anthraquinone process for producing hydrogen peroxide carrier, i.e. alkyl anthraquinone and tetrahydro alkyl anthraquinone, but because alkyl anthraquinone is continuously and cyclically subjected to hydrogenation reaction and oxidation reaction in the process of preparing hydrogen peroxide by anthraquinone process, various accompanying side reactions can not be avoided, some anthraquinone derivatives are generated, and substances which can not react to generate hydrogen peroxide are generated, and these substances are collectively called degradation products. The degradation of the alkylanthraquinone is divided into hydrogenation degradation and oxidation degradation, wherein the hydrogenation degradation comprises deep hydrogenation and carbonyl hydrogenolysis of anthraquinone aromatic rings, and the oxidation degradation is that the hydrogenated anthraquinone is subjected to oxidation reaction to generate anthraquinone epoxy compounds or acid anhydride substances. When the degradation product is accumulated to a certain concentration, the content of effective alkylanthraquinone in the working solution is reduced, the reaction efficiency is reduced, the loss is increased, and meanwhile, the degradation of the alkylanthraquinone can influence the property of the working solution, so that the density of the working solution is increased, the viscosity is increased, the operation load is increased, the energy consumption is increased, and the reaction can be stopped seriously. Therefore, the degradation and regeneration of organic matters such as anthraquinone and the like in the process of preparing hydrogen peroxide by the anthraquinone method are important factors influencing the production. The invention provides a rare earth modified molecular sieve which is used as a regenerant, has an ideal regeneration effect, can improve the stability of a molecular sieve framework through rare earth modification so as to improve the stability of the molecular sieve, and can increase active sites through the addition of rare earth elements so as to improve the activity of the molecular sieve.

Patent CN 101554996A proposes a preparation method of hydrogen peroxide working solution regenerant, which adopts calcium oxide as an active component, and the component proportion is as follows: 1 to 99 percent of calcium oxide, the balance of alkaline oxide, preferably 50 to 70 percent of calcium oxide, and the balance of alkaline oxide. The method has the advantages of high calcium oxide content, no bonding with alkaline oxides, direct mixing, low strength, instability, easy dispersion in working solution, blockage of production devices and production stop.

Patent 105174229B proposes a composite active regenerant for hydrogen peroxide working solution prepared by anthraquinone process and a preparation method thereof, the active regenerant comprises a two-layer or three-layer structure, wherein the two-layer structure comprises 50% -95% of active alumina on the outer surface layer, the balance of calcium oxide, 50% of calcium oxide on the core layer, 50% of silicon dioxide, and the three-layer structure comprises 50% -99% of active alumina on the outermost layer, 0-2.5% of alkali metal oxide, the balance of calcium oxide, 50% -99% of calcium oxide on the centripetal layer, 0-2.5% of alkali metal oxide, the balance of silicon dioxide, 50% -99% of silicon oxide on the core layer, and the balance of calcium oxide. The hydrogen peroxide working solution regenerant prepared by the method comprises a multilayer structure, a core structure does not contain a binder, the structure is unstable, in addition, the multilayer structure ensures that the regeneration effect is not thorough, the regeneration amount of the working solution is limited, and the alkalinity of the working solution is increased due to the long-term use of the regenerant.

Patent CN 105152137B proposes a hydrogen peroxide working solution regenerant in a hydrogen peroxide preparation process by an anthraquinone method and a preparation method thereof, wherein the regenerant comprises: 10-80% of alumina powder, 10-80% of magnesium oxide powder, 1-112% of sesbania powder, gamma-type aluminum oxide and cubic magnesium oxide powder. The aluminum oxide is used as a regenerant, the regeneration effect is not ideal, a large amount of anthraquinone degradation products still exist after treatment, the service life of the regenerant is short, the regenerant needs to be replaced, and the waste of the regenerant is caused.

Disclosure of Invention

Based on the problems, the invention aims to provide a regenerant for preparing hydrogen peroxide working solution by an anthraquinone process, the regenerant is used for carrying out rare earth modification on an X-type sieve or a Y-type molecular sieve, the framework structure of the molecular sieve can be stabilized by the rare earth modification, the stability and the catalytic performance of the molecular sieve are improved, and in addition, rare earth elements can provide more active sites and improve the activity of the molecular sieve.

The regenerant is prepared by ion exchange roasting of a molecular sieve by using a rare earth solution, wherein the molecular sieve is a formed 13X type molecular sieve or a formed NaY type molecular sieve.

Preferably, the molecular sieve requires pretreatment before modification with the rare earth solution.

More preferably, the pretreatment method of the molecular sieve is to mix the molecular sieve with 10% ammonium sulfate solution according to the weight ratio of 1: 5, treating at 90 ℃ for 3h, filtering, washing and drying.

Preferably, the rare earth element in the rare earth solution is at least one of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium, and the content of the rare earth element in the regenerant is 1-10 wt%.

More preferably, the rare earth elements in the rare earth solution are lanthanum, cerium, praseodymium and neodymium, and the proportion of the rare earth elements in the regenerant is 4-6 wt%.

Further preferably, the ion exchange roasting is to mix the molecular sieve and the rare earth solution according to a mass ratio of 1: 3-8, then carrying out ion exchange, filtering, washing, drying and roasting. Wherein the ion exchange temperature is 50-90 ℃, and the ion exchange time is 2-6 h; the filtering mode is filter pressing, the number of times of alcohol washing is 3, the drying temperature is 80-130 ℃, and the time is 2-8 h. The roasting temperature is 450-600 ℃, and the roasting time is 4-10 h.

The invention also aims to provide an application method for regenerating the hydrogen peroxide working solution prepared by the anthraquinone process by using the regenerant, the application method is to mix the regenerant and the hydrogenated and degraded anthraquinone hydrogen peroxide working solution and react for 6 hours at the temperature of 50 ℃, and the mass ratio of the regenerant to the hydrogenated and degraded anthraquinone hydrogen peroxide working solution is 1: 20.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, rare earth elements are used for modifying the molecular sieve, so that the molecular sieve can carry out regeneration reaction on the hydrogenated and degraded anthraquinone hydrogen peroxide working solution, the concentration of EAQ and H4EAQ in the working solution is increased, and the content of effective anthraquinone in the working solution is increased.

Detailed Description

The present invention will be further described with reference to the following specific examples.

Example 1

Weighing 50g of the formed 13X type molecular sieve, mixing with 300g of 15% ammonium chloride solution, adding into a glass kettle, heating to 90 ℃, stirring for 3h, then filtering, washing with 100g of deionized water for 3 times, and drying at 130 ℃ for 12 h. Weighing 50g of formed 13X-type molecular sieve after exchange drying, mixing with 125g of 5% lanthanum nitrate hexahydrate solution, stirring and exchanging for 4h at the temperature of 60 ℃, then filtering the material, washing with 50g of deionized water for three times, drying for 6h at the temperature of 120 ℃, and roasting for 6h at the temperature of 500 ℃. The lanthanum modified 13X molecular sieve regenerant was obtained and designated as sample 1.

Example 2

Weighing 50g of the formed 13X type molecular sieve, mixing with 300g of 15% ammonium chloride solution, adding into a glass kettle, heating to 90 ℃, stirring for 3h, then filtering, washing with 100g of deionized water for 3 times, and drying at 130 ℃ for 12 h. Weighing 50g of formed 13X-type molecular sieve after exchange drying, mixing with 125g of 5% cerous nitrate hexahydrate solution, stirring and exchanging for 4h at the temperature of 60 ℃, then filtering the material, washing with 50g of deionized water for three times, drying for 6h at the temperature of 120 ℃, and roasting for 6h at the temperature of 500 ℃. The cerium modified 13X molecular sieve regenerant was obtained and designated as sample 2.

Example 3

Weighing 50g of the formed NaY type molecular sieve, mixing with 300g of 15% ammonium chloride solution, adding into a glass kettle, heating to 90 ℃, stirring for 3h, then filtering, washing with 100g of deionized water for 3 times, and drying at 130 ℃ for 12 h. Weighing 50g of formed NaY type molecular sieve after exchange drying, mixing with 125g of 5% lanthanum nitrate hexahydrate solution, stirring and exchanging for 4h at the temperature of 60 ℃, then filtering the material, washing with 50g of deionized water for three times, drying for 6h at the temperature of 120 ℃, and roasting for 6h at the temperature of 500 ℃. The lanthanum modified NaY molecular sieve regenerant was obtained and recorded as sample 3.

Example 4

Weighing 50g of the formed NaY type molecular sieve, mixing with 300g of 15% ammonium chloride solution, adding into a glass kettle, heating to 90 ℃, stirring for 3h, then filtering, washing with 100g of deionized water for 3 times, and drying at 130 ℃ for 12 h. Weighing 50g of formed NaY type molecular sieve after exchange drying, mixing with 125g of 5% cerous nitrate hexahydrate solution, stirring and exchanging for 4h at the temperature of 60 ℃, then filtering the material, washing with 50g of deionized water for three times, drying for 6h at the temperature of 120 ℃, and roasting for 6h at the temperature of 500 ℃. The cerium modified NaY molecular sieve regenerant was obtained and recorded as sample 4.

Comparative example 1

The 13X type molecular sieve which was not modified and molded was used as a regenerant and was designated as sample 5.

The regenerants prepared for samples 1-5 were characterized and reported for crystallinity, XRF and BET, with the results shown in Table 1. SAR is SiO₂/Al₂O₃In a molar ratio of (a).

TABLE 1

Examples of the applications

Dissolving 2-Ethylanthraquinone (EAQ) with the working solution composition of 140g/L in 2L heavy Aromatic Hydrocarbon (AH) and trioctyl phosphate (TOP) according to the following ratio of 75: 25 (volume ratio), adding the dissolved materials and 1g of palladium catalyst into an autoclave, sealing the autoclave, replacing the autoclave for 3 times by hydrogen, introducing the hydrogen to a certain pressure, heating by a water bath to reach the reaction temperature, violently stirring, reacting for a period of time, and cooling to obtain the hydrogen peroxide working solution subjected to hydrogenation degradation. The regenerants in examples 1-4 and comparative example 1 are weighed and respectively mixed with the hydrogenated and degraded anthraquinone hydrogen peroxide working solution according to the mass ratio of 1:20, the mixture is added into a triangular flask, the triangular flask is sealed and placed in a water bath constant temperature oscillator to react for 6 hours at the temperature of 50 ℃, the triangular flask is taken out to be cooled, the temperature is cooled to room temperature, the working solution in the triangular flask is taken to perform quantitative analysis, and the analysis results are shown in table 2.

TABLE 2

The experimental results show that the molecular sieve regenerant modified by the rare earth elements can achieve the regeneration reaction of the working solution for preparing hydrogen peroxide by the anthraquinone method.

The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.