Device and method for online extending the service life of a solid phosphoric acid catalyst with silica gel as a carrier

Abstract

The present invention relates to an apparatus and method for online extending the life of a solid phosphoric acid catalyst using silica gel as a carrier. The apparatus and method mainly solve the problems of a short reaction cycle, high catalyst consumption, and high catalyst replacement construction cost in existing polymerization reaction apparatuses using silica gel as a carrier and solid phosphoric acid as a catalyst. The apparatus and method are characterized in that: the feed pipeline of the polymerization reactor (15) is connected to an activated water preparation unit and a desalted water tank (2); the activated water preparation unit comprises an activated water storage tank (6) and an activated water preparation tank (11); and the activated water storage tank (6) is connected to the activated water preparation tank (11). The method for online extending the life of the solid phosphoric acid catalyst comprises: soaking the screened waste catalyst with desalted water, controlling the temperature for a period of time, extracting the active ingredients in the waste catalyst, and thus obtaining activated water containing the active ingredients. The apparatus can effectively restore the activity of the catalyst online, extend the service life of the catalyst, and reduce catalyst consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of petrochemical industry, in particular to a device and method for online prolonging the service life of a solid phosphoric acid catalyst using silica gel as a carrier. Background Art

[0002] In chemical production processes, polymerization reactions catalyzed by silica-supported solid phosphoric acid, such as butene oligomerization, propylene oligomerization, and styrene-propylene olefination, often experience continuous loss of active ingredients from the silica-supported solid phosphoric acid catalyst during the final stages of production. This degrades the functionality of the catalyst's active centers, weakens the catalytic effect, and leads to poor polymerization results, reduced feedstock conversion, and ultimately reaction termination. The reactor must be replaced with a new catalyst before production can resume. The current operating conditions of the plant are characterized by short catalyst reaction cycles, high catalyst consumption, and high catalyst replacement costs. At the end of the reaction, a small amount of active ingredients still remain within the catalyst, unable to be activated and thus replaced as spent.

[0003] Moreover, in this type of polymerization reaction, in order to ensure good reaction results, there are strict pressure drop requirements for loading the catalyst. Therefore, before the catalyst is loaded, a portion of defective catalysts with unqualified particle size will be screened out and treated as waste agents. The screened waste agents account for about 20% of the total catalyst production and preparation. This part of the waste agents needs to be treated in an environmentally friendly manner, resulting in high catalyst production costs and a great deal of waste. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the problems of short reaction cycle, high catalyst consumption, and high catalyst replacement construction costs in existing polymerization reaction devices using silica gel as a catalyst. By providing an apparatus for online extending the life of a solid phosphoric acid catalyst using silica gel as a catalyst, the present invention effectively restores the catalyst's activity online without requiring shutdown or production interruption, thereby extending the catalyst's service life online and reducing catalyst consumption. The present invention also provides a method for online extending the life of a solid phosphoric acid catalyst using silica gel as a catalyst.

[0005] The present invention solves the problem through the following technical solution: the device for online extending the life of a solid phosphoric acid catalyst with silica gel as a carrier comprises a polymerization reactor, wherein a feed pipeline of the polymerization reactor is connected to an activated water preparation unit and a desalted water tank;

[0006] The activated water preparation unit includes an activated water storage tank and an activated water preparation tank; the activated water storage tank is connected to the activated water preparation tank.

[0007] The activated water storage tank inlet pipeline is connected to the activated water preparation tank outlet pipeline through an activated water pump; the activated water storage tank outlet is connected to the desalted water tank outlet pipeline through an activated water tank outlet line;

[0008] The activated water tank outlet line is connected to the activated water storage tank outlet valve; the activated water storage tank inlet line is connected to the activated water storage tank inlet valve;

[0009] The activated water preparation tank provides a space for soaking desalted water and waste agent to extract effective ingredients; the bottom of the activated water preparation tank is a catalyst layer, which is used to fill the waste catalyst screened out due to unqualified particle size during the catalyst production process; the upper part of the catalyst layer in the activated water preparation tank is filled with desalted water;

[0010] The desalted water tank outlet pipeline is connected to the desalted water tank outlet valve.

[0011] Preferably, the activated water storage tank is also connected to a liquid level gauge.

[0012] Preferably, a filter is connected to the outlet pipeline of the activated water preparation tank; a thermometer is connected to the inlet pipeline of the activated water preparation tank; and an electric heating wire is installed at the bottom outside the activated water preparation tank.

[0013] Preferably, the top of the desalted water tank is connected to a desalted water tank inlet pipeline, and the desalted water tank inlet pipeline is connected to a desalted water tank inlet valve.

[0014] Preferably, the activated water storage tank and the desalted water tank are connected in parallel, and a valve is used to switch the activated water storage tank and the desalted water tank online as needed.

[0015] The present invention also provides a method for online extending the life of a solid phosphoric acid catalyst with silica gel as a carrier, comprising the following steps:

[0016] 1. During a polymerization reaction using silica gel as a carrier and solid phosphoric acid as a catalyst, the activated water storage tank inlet valve and the activated water storage tank outlet valve are closed; desalted water delivered from the pipe network enters the desalted water tank, flows out from the bottom of the desalted water tank, passes through the desalted water tank outlet valve, enters the desalted water pump, and then merges with the feed before entering the polymerization reactor to carry out the polymerization reaction; when the catalyst activity gradually decreases and the conversion rate is less than 35%, the production reaches the end of the catalyst period and preparations are made to switch to the activated water system;

[0017] 2.) Prepare activated water containing active ingredients to the required concentration;

[0018] 3. After the activated water is prepared, open the activated water tank inlet valve, start the activated water pump, allow the activated water to pass through the filter to filter out impurities carried during the preparation process, be pumped out by the activated water pump, and enter the activated water tank through the activated water tank inlet valve; when the liquid level gauge measures the liquid level to be above 50%, the activated water tank outlet valve can be opened, and the desalted water tank outlet valve can be closed, allowing the activated water to enter the desalted water pump through the activated water tank outlet line and enter the polymerization reactor together with the raw materials to continue the reaction.

[0019] Preferably, the method for preparing activated water containing active ingredients comprises:

[0020] 1. First, the waste catalysts with unqualified particle size screened out during the catalyst production process are placed at the bottom of the activated water preparation tank, and then a certain amount of desalted water is added. The electric heating at the bottom of the tank is started, and the constant temperature effect of the activated water preparation tank is measured by a tank thermometer; after soaking and extracting for 12 hours, samples are taken for analysis every 30 minutes, and the analysis is repeated for more than two times. When the content of active ingredients in the activated water no longer changes, the bottom heating is stopped;

[0021] 2. Based on the sampling and analysis results, an appropriate amount of desalted water is added to the activated water preparation tank after calculation to adjust the concentration of active ingredients in the activated water in the tank to 0.3-3.5 mg / 100 ml; the concentration of active ingredients in the activated water is adjusted in a timely manner according to changes in conversion rate and reaction temperature after injection.

[0022] Preferably, during the activated water preparation process, the constant temperature of the activated water preparation tank is 40-60°C; the optimal value is 50°C.

[0023] Preferably, the optimal concentration of active ingredients in the activated water is 0.4-1.0 mg / 100 ml; the amount of activated water is 0.3%-1.2% of the reaction feed amount.

[0024] Preferably, the polymerization reaction using solid phosphoric acid with silica gel as a carrier as a catalyst is a butene polymerization reaction, a propylene polymerization reaction and a styrene-propylene olefination reaction; the screened out waste catalyst is an unqualified inferior catalyst separated by automatic screening during the catalyst production and preparation process because the catalyst particle size does not meet the requirements.

[0025] The activated water is a water solution obtained by soaking the screened waste catalyst with deionized water and extracting the active ingredients contained in the catalyst.

[0026] The principle of online extension of the life of solid phosphoric acid catalyst with silica gel as support:

[0027] The catalysts with unqualified particle size screened out during the catalyst preparation process are soaked in deionized water to prepare an activated aqueous solution containing active ingredients. This is carried out at a constant temperature of about 50°C in a water tank with a heating function, utilizing the mutual solubility of the active ingredients in the catalyst and the deionized water to prepare an aqueous solution of active ingredients. The constant temperature of 50°C is maintained for more than 12 hours to extract the active ingredients in the waste catalysts screened out after the catalyst production and preparation, thereby obtaining activated water containing active ingredients. The catalyst bulk density is about 850kg / m 3 , the catalyst is loaded at the bottom of the catalyst preparation tank, and the solid catalyst and the aqueous solution are naturally separated by stratification to achieve the separation of the catalyst and water. The prepared activated water contains the effective ingredients of the catalyst. At the end of production, the prepared activated water is injected into the reactor instead of desalted water, which can more effectively activate the catalyst that has lost some of its activity, replenish the active ingredients for the polymerization reaction, thereby restoring the activity of the catalyst, and the polymerization reaction continues, achieving an extension of the reaction cycle by more than 30 days. The activation effect of activated water on the catalyst at the end of production is far better than that of desalted water. The method of the present invention is equivalent to recovering the effective ingredients of defective catalysts in the catalyst production and preparation process.

[0028] Compared with the above background technology, the present invention has the following beneficial effects:

[0029] The device for online extending the life of a solid phosphoric acid catalyst using silica gel as a carrier is applied. At the end of the catalyst production, activated water containing effective ingredients is used instead of desalted water to achieve good stimulation of the catalyst's potential activity, effectively extend the catalyst production cycle, reduce the number of catalyst replacements per year, and lower the catalyst replacement and maintenance costs.

[0030] By recycling the active ingredients contained in waste catalysts resulting from substandard particle size during the catalyst production process, the catalyst life and reactor operating cycle are extended, and catalyst consumption is reduced. This solves the problems of high catalyst loss, high construction costs, and high environmental treatment costs associated with a short reactor operating cycle, thereby optimizing operations and reducing operating costs. The present invention effectively restores catalyst activity online during the production process without interrupting production, improving the conversion rate of raw materials and reducing the costs of catalyst replacement, construction, and environmental treatment. It is particularly suitable for the final stage of butene oligomerization, propylene oligomerization, and styrene-propylene olefination using solid phosphoric acid supported on silica gel as a catalyst. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Attachment Figure 1 It is a schematic diagram of the device of the present invention.

[0032] In the figure: 1-desalted water tank inlet valve; 2-desalted water tank; 3-desalted water tank outlet valve; 4-desalted water pump; 5-activated water storage tank outlet valve; 6-activated water storage tank; 7-activated water storage tank inlet valve; 8-liquid level gauge; 9-activated water pump; 10-filter; 11-activated water preparation tank; 12-activated water tank outlet line; 13-thermometer; 14-catalyst layer; 15-polymerization reactor. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings:

[0034] As attached Figure 1 As shown, the device for online extending the life of a solid phosphoric acid catalyst with silica gel as a carrier includes a polymerization reactor 15, the feed pipeline of the polymerization reactor 15 is connected to an activated water preparation unit and a desalted water tank 2; the activated water preparation unit includes an activated water storage tank 6 and an activated water preparation tank 11.

[0035] The inlet pipeline of the activated water storage tank 6 is connected to the outlet pipeline of the activated water preparation tank 11 through the activated water pump 9. The activated water storage tank 6 is used to hold the configured activated water solution; the activated water pump 9 is used to extract the configured activated water solution of active ingredient water and send it to the activated water storage tank; the outlet of the activated water storage tank 6 is connected to the outlet pipeline of the desalted water tank 2 through the activated water tank outlet line 12; the activated water tank outlet line 12 is connected to the activated water storage tank outlet valve 5; the inlet pipeline of the activated water storage tank 6 is connected to the activated water storage tank inlet valve 7; the activated water storage tank 6 is also connected to a liquid level gauge 8 for measuring the liquid level of the activated water tank; the activated water preparation tank 11 provides space for soaking the desalted water and the waste catalyst to extract the active ingredient; the outlet pipeline of the activated water preparation tank 11 is also connected to a filter 10 for filtering solid particles in the activated water; A thermometer 13 is connected to the inlet pipeline of the water preparation tank 11; the bottom of the activated water preparation tank 11 is a catalyst layer 14, which is used to fill the waste catalyst generated due to unqualified particle size in the catalyst production and preparation process; an electric heating trace heating wire is installed at the bottom of the outer side of the activated water preparation tank 11 to provide a suitable immersion temperature for the activated water preparation tank 11; the top of the desalted water tank 2 is connected to the desalted water inlet pipeline from the pipeline network, and the desalted water inlet pipeline from the pipeline network is connected to the desalted water tank inlet valve 1; the outlet pipeline of the desalted water tank 2 is connected to the polymerization reactor through the desalted water pump 4; the outlet pipeline of the desalted water tank 2 is also connected to the desalted water tank outlet valve 3; the feed pipeline of the polymerization reactor 15 is connected in parallel to the activated water storage tank 6 and the desalted water tank 2, and the valves 3 and 5 are used to realize online switching of the activated water storage tank 6 and the desalted water tank 2 as needed.

[0036] The process for activating and extending the life of a solid phosphoric acid catalyst with silica gel as a carrier using the online device for extending the life of a solid phosphoric acid catalyst with silica gel as a carrier is as follows:

[0037] 1.) Close the activated water storage tank inlet valve 7 and the activated water storage tank outlet valve 5; the desalted water delivered from the pipe network enters the desalted water tank 2 through valve 1, flows out from the bottom of the tank, passes through the desalted water tank outlet valve 3, enters the desalted water pump 4, and then merges with the feed into the polymerization reactor to carry out the polymerization reaction; when the reaction reaches the end of the production process, the catalyst activity decreases, and the conversion rate drops below 35%, prepare to switch to the activated water system;

[0038] 2. First, the waste catalysts with unqualified particle size screened out during the catalyst production process are placed at the bottom of the activator preparation box, and then a certain amount of desalted water is added. The electric heating at the bottom of the box is started, and the constant temperature effect is measured by a box thermometer; the constant temperature is 40-60°C; after soaking and extracting for 12 hours, samples are taken for analysis every 30 minutes, and the analysis is repeated for more than two times. When the content of active ingredients in the activated water no longer changes, the bottom heating is stopped;

[0039] 3. Based on the sampling and analysis results, an appropriate amount of demineralized water is added to the activated water preparation tank after calculation. Sampling and analysis are then performed to adjust the concentration of the active ingredient in the activated water to the desired concentration, generally 0.3-3.5 mg / 100 ml. The concentration of the active ingredient in the activated water is adjusted appropriately based on changes in conversion rate and reaction temperature after injection. When the activated water is injected into the reactor, the amount of activated water is 0.3%-1.2% of the reaction feed.

[0040] 4.) Adjust the concentration of the active ingredient in the activated water according to the reaction conditions. After the activated water solution is prepared, start the activated water pump 9, filter out impurities carried during the preparation process through the filter 10, pump out the activated water through the activated water pump 9, and enter the activated water storage tank 6 through the activated water storage tank inlet valve 7; when the liquid level measured by the liquid level meter 8 is above 50%, the activated water storage tank outlet valve 5 can be opened, and the desalted water tank outlet valve 3 can be closed, allowing the activated water to enter the desalted water pump 4 through the activated water tank outlet line 12 and enter the polymerization reactor together with the raw materials.

[0041] Example 1

[0042] The device for online prolonging the life of solid phosphoric acid catalyst with silica gel as the carrier is used in the nonene production unit of Daqing Zhonglan Petrochemical Co., Ltd. using propylene as the raw material:

[0043] In the nonene production unit, propylene undergoes polymerization reaction under the action of a catalyst in the reactor to produce nonene. Propylene is mixed with demineralized water and then enters the polymerization reactor. The propylene raw material undergoes polymerization reaction under the catalytic action of a solid phosphoric acid catalyst with silica gel as the carrier, and a certain temperature and pressure are controlled. The product obtained by the polymerization reaction is the target product nonene.

[0044] As production progresses, the effective ingredients carried by the solid phosphoric acid catalyst with silica gel as the carrier continue to fall off, the function of the catalyst active center decreases, the catalytic effect becomes weaker and weaker, the polymerization reaction effect becomes worse and worse, the raw material conversion rate gradually decreases, and the reaction selectivity becomes worse.

[0045] As production progresses, the catalyst activity gradually decreases. When the conversion rate gradually decreases to below 35% and the reaction selectivity is lower than 40%, the catalyst reaches the end of production and is ready to switch to the activated water system online.

[0046] 1. First, the waste catalysts with unqualified particle size screened out during the catalyst production process are placed at the bottom of the activator preparation box, and then a certain amount of desalted water is added. The electric heating at the bottom of the box is started, and the constant temperature effect is measured by a box thermometer; the constant temperature is 50°C; after soaking and extracting for 12 hours, samples are taken for analysis every 30 minutes, and the analysis is repeated for more than two times. When the content of active ingredients in the activated water no longer changes, the bottom heating is stopped;

[0047] 2.) According to the sampling and analysis results, add an appropriate amount of desalted water to the activated water preparation tank after calculation. During the sampling and analysis, at the initial injection stage, the concentration of active ingredients in the activated water in the tank is adjusted to 0.3-0.4 mg / 100 ml.

[0048] 3. After the activated aqueous solution is prepared, the activated water pump 9 is started to filter out impurities carried during the preparation process through the filter 10, and the activated water is pumped out by the activated water pump 9 and enters the activated water storage tank 6 through the activated water storage tank inlet valve 7;

[0049] 4.) When the liquid level measured by the liquid level gauge 8 is above 50%, the activated water storage tank outlet valve 5 can be opened, the desalted water tank outlet valve 3 can be closed, and the desalted water tank 2 can be deactivated, so that the activated water enters the desalted water pump 4 through the activated water tank outlet line 12 and enters the polymerization reactor together with the propylene.

[0050] 5. After all the activated water in the activated water preparation tank 11 has been transferred to the activated water storage tank 6, the activated water storage tank inlet valve 7 is closed and the activated water pump 9 is stopped. The remaining catalyst waste residue in the activated water preparation tank 11 is removed and replaced with the waste catalyst of substandard particle size screened out during the catalyst production process. Processes 1) to 3) are repeated to prepare activated water in batches in the activated water preparation tank 11 and transfer the batches to the activated water storage tank 6.

[0051] 6.) The concentration of active ingredients in the activated water in the activated water preparation tank 11 is adjusted in a timely manner according to the changes in the conversion rate of the device after injection, the reaction temperature, the catalyst selectivity, etc. The general concentration of active ingredients in the activated water is: 0.3-3.5 mg / 100 ml.

[0052] 7.) The activated water in the activated water storage tank 6 is continuously transported to the reactor through the desalted water pump 4. The amount of activated water is controlled according to the test indicators of the wastewater discharged from the device and the catalyst selectivity indicators. The amount of activated water is generally 0.3%-1.2% of the reaction feed amount.

[0053] Benefit calculation after implementation:

[0054] By applying the device and method of the present invention, the service life of the catalyst is effectively extended, and the service time of each cycle is extended by more than 1 month. Before the implementation of the present invention, the catalyst was replaced at least 4 times a year. After the implementation of the present invention, the production cycle was extended, and the catalyst was replaced 3 times a year, saving the benefits generated by the catalyst by more than 125,000 yuan, achieving a new breakthrough in energy conservation, consumption reduction, and waste recycling.

[0055] 1 ton of waste agent is recycled in each cycle, 4 cycles are carried out each year, 4 tons of waste agent are recycled and utilized, and the environmental protection treatment fees such as catalyst replacement are saved by more than 10 yuan each year.

[0056] By implementing the invented technology, the number of catalyst replacements per year has been reduced from four to three, saving 80,000 yuan in construction costs such as catalyst loading and unloading and equipment maintenance. Each time the reactor is switched, the loss of some of the reaction materials due to venting is approximately 3,000 yuan.

[0057] Total benefits / year:

[0058] 125,000 yuan (agent replacement fee) + 100,000 yuan (environmental protection treatment fee) + 8 (construction fee) + 3,000 yuan (material loss fee during switching process) = 308,000 yuan.

Claims

1. An apparatus for online prolonging the life of a solid phosphoric acid catalyst with silica gel as a carrier, comprising a polymerization reactor (15), characterized in that: The feed pipeline of the polymerization reactor (15) is connected to the activated water preparation unit and the desalted water tank (2); The activated water preparation unit comprises an activated water storage tank (6) and an activated water preparation tank (11); the activated water storage tank (6) is connected to the activated water preparation tank (11); The activated water preparation tank (11) provides a space for soaking desalted water and waste agent to extract effective components; the bottom of the activated water preparation tank (11) is a catalyst layer (14), which is used to fill the waste catalyst screened out due to unqualified particle size during the catalyst production process, and the upper part of the catalyst layer (14) in the activated water preparation tank (11) is filled with desalted water; A method for preparing activated water containing active ingredients, comprising: 1) First, waste catalysts with unqualified particle size that were screened out during the catalyst production process are placed at the bottom of the activated water preparation tank. A certain amount of desalted water is then added, and the electric heating at the bottom of the tank is started. The constant temperature effect of the activated water preparation tank is measured using a tank thermometer. After soaking and extracting for 12 hours, samples are taken for analysis every 30 minutes. This is repeated for at least two consecutive analyses. When the activated water contains no longer any active ingredients, the bottom heating is stopped. 2) Based on the sampling and analysis results, an appropriate amount of desalted water is added to the activated water preparation tank after calculation to adjust the concentration of active ingredients in the activated water in the tank to 0.3-3.5mg / 100ml; the concentration of active ingredients in the activated water is adjusted in a timely manner according to the changes in conversion rate and reaction temperature after injection.

2. The device for online prolonging the life of a solid phosphoric acid catalyst with silica gel as a carrier according to claim 1, characterized in that: The inlet pipeline of the activated water storage tank (6) is connected to the outlet pipeline of the activated water preparation tank (11) through the activated water pump (9); the outlet of the activated water storage tank (6) is connected to the outlet pipeline of the desalted water tank (2) through the activated water tank outlet line (12); The activated water tank outlet line (12) is connected to the activated water storage tank outlet valve (5); and the activated water storage tank (6) inlet pipeline is connected to the activated water storage tank inlet valve (7).

3. The device for online prolonging the life of a solid phosphoric acid catalyst with silica gel as a carrier according to claim 2, characterized in that: The activated water preparation tank (11) outlet pipeline is also connected to a filter (10); the activated water preparation tank (11) inlet pipeline is connected to a thermometer (13); and an electric heating wire is installed at the bottom of the outer side of the activated water preparation tank (11).

4. The device for online prolonging the life of a solid phosphoric acid catalyst with silica gel as a carrier according to claim 2, characterized in that: The top of the desalted water tank (2) is connected to a desalted water tank inlet pipeline, and the desalted water tank inlet pipeline is connected to a desalted water tank inlet valve (1); the outlet pipeline of the desalted water tank (2) is connected to a desalted water tank outlet valve (3).

5. The device for online prolonging the life of a solid phosphoric acid catalyst with silica gel as a carrier according to claim 2, characterized in that: The activated water storage tank (6) is also connected to a liquid level meter (8); the activated water storage tank (6) and the desalted water tank (2) are connected in parallel.

6. A method for online prolonging the life of a solid phosphoric acid catalyst with silica gel as a carrier using the device according to any one of claims 1 to 5, characterized in that: The following steps are involved: 1) In a polymerization reaction using solid phosphoric acid as a catalyst and silica gel as a carrier, the activated water storage tank inlet valve (7) is closed, and the activated water storage tank outlet valve (5) is closed; desalted water sent from the pipe network enters the desalted water tank (2), flows out from the bottom of the desalted water tank (2), passes through the desalted water tank outlet valve (3), enters the desalted water pump (4), and then merges with the feed and enters the polymerization reactor to carry out the polymerization reaction; when the catalyst activity gradually decreases and the raw material conversion rate is lower than 35%, the production reaches the end of the catalyst, and the activated water system is prepared to be switched; 2) Prepare activated water containing active ingredients to the required concentration; 3) After the activated water is prepared, the activated water storage tank inlet valve (7) is opened, and the activated water pump (9) is started, so that the activated water passes through the filter (10) to filter out impurities carried during the preparation process, is pumped out through the activated water pump (9), and enters the activated water storage tank through the activated water storage tank inlet valve (7); when the liquid level gauge measures the liquid level to be above 50%, the activated water storage tank outlet valve (5) is opened, and the desalted water tank outlet valve (3) is closed, so that the activated water passes through the activated water tank outlet line (12) to enter the desalted water pump (4), and enters the polymerization reactor together with the raw materials to continue the reaction.

7. The method for online prolonging the life of a solid phosphoric acid catalyst with silica gel as a carrier according to claim 6, characterized in that: During the activated water preparation process, the activated water preparation tank is kept at a constant temperature of 40-60°C.

8. The method for online prolonging the life of a solid phosphoric acid catalyst with silica gel as a carrier according to claim 6, characterized in that: The optimal concentration of active ingredients in activated water is 0.4-1.0 mg / 100 ml; the amount of activated water is 0.3%-1.2% of the reaction feed amount.

9. The method for online prolonging the life of a solid phosphoric acid catalyst with silica gel as a carrier according to claim 6, characterized in that: The polymerization reaction using silica gel as a carrier and solid phosphoric acid as a catalyst is a butene polymerization reaction, a propylene polymerization reaction and a styrene-propylene olefination reaction; the activated water is an aqueous solution obtained by soaking the screened waste catalyst with deionized water to extract the active ingredients contained in the catalyst.

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