阅读说明：本技术 一种离子液烷基化装置结垢清洗液及其使用方法 (Scale cleaning fluid for ionic liquid alkylation device and application method thereof ) 是由 汪五四 于 2020-07-16 设计创作，主要内容包括：本申请涉及一种离子液烷基化装置结垢清洗液及其使用方法,涉及液化气回收技术领域,该清洗液包括以下重量百分比的组分：酸洗缓蚀剂0.1％～2.5％、碱性物质0％～10％、表面活性剂0％～2％、助洗剂0％～5％、Fe<Sup>3+</Sup>还原剂0％～2.5％、Fe<Sup>3+</Sup>络合剂0％～2.5％以及去离子水75.5％～99.9％。本申请通过多种化学成分的合理配比,在保证成本较低的前提下,配合清洗设备获得较佳的清洗效果,提高清洗工作的效率。(The application relates to a scale cleaning liquid for an ionic liquid alkylation device and a using method thereof, relating to the technical field of liquefied gas recovery, wherein the cleaning liquid comprises the following components in percentage by weight: 0.1-2.5 percent of pickling inhibitor, 0-10 percent of alkaline substance, 0-2 percent of surfactant, 0-5 percent of builder, and Fe 3+ 0 to 2.5 percent of reducing agent and Fe 3+ 0 to 2.5 percent of complexing agent and 75.5 to 99.9 percent of deionized water. This application is through the rational ratio of multiple chemical composition, under the lower prerequisite of assurance cost, coordinates cleaning equipment to obtain the cleaning performance of preferred, improves the efficiency of cleaning.)

1. The scale cleaning liquid for the ionic liquid alkylation device is characterized by comprising the following components in percentage by weight:

0.1-2.5 percent of pickling inhibitor, 0-10 percent of alkaline substance, 0-2 percent of surfactant, 0-5 percent of builder, and Fe³⁺0 to 2.5 percent of reducing agent and Fe³⁺0 to 2.5 percent of complexing agent and 75.5 to 99.9 percent of deionized water.

2. The ionic liquid alkylation apparatus fouling cleaning fluid of claim 1, wherein:

the pickling corrosion inhibitor comprises at least one of Lan826, Lan5, formol, CM911 or urotropine.

3. The ionic liquid alkylation apparatus fouling cleaning fluid of claim 1, wherein:

the alkaline substance comprises NaOH, KOH and NH₃、Ca(OH)₂Or Na₃PO₄At least one of (1).

4. The ionic liquid alkylation apparatus fouling cleaning fluid of claim 1, wherein:

the surfactant includes at least one of an anionic active agent, a cationic active agent, or a nonionic active agent.

5. The ionic liquid alkylation apparatus fouling cleaning fluid of claim 1, wherein:

the builder comprises at least one of methanol, ethanol and methyl ethyl ether.

6. The ionic liquid alkylation apparatus fouling cleaning fluid of claim 1, wherein:

said Fe³⁺The reducing agent comprises Na₂S₂O₃、Na₂SO₃At least one of L-ascorbic acid and sodium L-ascorbate.

7. The ionic liquid alkylation apparatus fouling cleaning fluid of claim 1, wherein:

said Fe³⁺The complexing agent comprises at least one of NTA, EDTA-2Na, DTPA, EDTMPS and DETPMS.

8. A method of using the ionic liquid alkylation unit fouling cleaning solution of claim 1, the method being based on at least two spray absorption towers in series communication, the method comprising the steps of:

cleaning the ionic liquid alkylation device by using the scaling cleaning liquid of the ionic liquid alkylation device, and collecting cleaning waste gas generated during cleaning;

introducing the cleaning waste gas into a first spray absorption tower;

detecting the concentration of HCl in the cleaning waste gas after neutralization and absorption in the spray absorption tower;

when the concentration of HCl in the neutralized and absorbed cleaning waste gas reaches the standard, discharging the neutralized and absorbed cleaning waste gas;

when the HCl concentration in the cleaning waste gas after neutralization and absorption exceeds the standard, introducing the cleaning waste gas after neutralization and absorption into the next spraying absorption tower for neutralization and absorption until the HCl concentration in the cleaning waste gas after neutralization and absorption reaches the standard.

9. A method of using a fouling cleaning fluid for an ionic liquid alkylation unit according to claim 1, said method being based on at least two sequentially connected gas-liquid mixing units, said method comprising the steps of:

cleaning the ionic liquid alkylation device by using the scaling cleaning liquid of the ionic liquid alkylation device, and collecting cleaning waste gas generated during cleaning;

introducing the cleaning waste gas into a first gas-liquid mixing device;

detecting the concentration of HCl in the cleaning waste gas after neutralization and absorption in the gas-liquid mixing device;

when the concentration of HCl in the neutralized and absorbed cleaning waste gas reaches the standard, discharging the neutralized and absorbed cleaning waste gas;

when the HCl concentration in the cleaning waste gas after neutralization and absorption exceeds the standard, introducing the cleaning waste gas after neutralization and absorption into the next gas-liquid mixing device for neutralization and absorption until the HCl concentration in the cleaning waste gas after neutralization and absorption reaches the standard.

Technical Field

The invention relates to the technical field of liquefied gas recovery, in particular to a scale cleaning solution for an ionic liquid alkylation device.

Background

The alkylate oil is colorless liquid, has high octane value, good chemical stability, physical stability and low toxicity, has no corrosivity, and is convenient for storage and transportation.

At present, the alkylation techniques are mainly HF alkylation, H₂SO₄Alkylation using HF as the formerIs a catalyst, since HF has a strong corrosive effect on the skin. Therefore, there is a great risk of harm to the human body using HF alkylation. And with H₂SO₄Alkylation as a catalyst is effective in reducing the risk of injury to the human body when H₂SO₄In the using process, the waste H cannot be recycled due to the reduction of concentration and purity₂SO₄The treatment process can cause serious problems of environmental pollution, equipment corrosion and the like.

In recent years, an ionic liquid alkylation technology has been developed, which can solve the risk of the catalyst damaging the human body and can greatly reduce the generation amount of the waste catalyst, thereby reducing the pollution to the environment.

While the ionic liquid acts as a catalyst, the ionic liquid itself generates a small amount of solid particles because of participating in the reaction, and even if the ionic liquid is subjected to a sedimentation separation measure, the solid particles still deposit in a tower, a container, a heat exchanger, a filter and related process pipelines through which the ionic liquid passes.

The scaling substances deposited on the tray can cause the separation efficiency of the tower to be reduced, and can seriously cause the liquid flow to be incapable of naturally reducing, thereby causing the phenomenon of flooding or flushing the tower; the scale substances deposited at the bottom of the container can cause the blockage of a pressure guiding pipe of the container liquid level meter, so that an error signal is generated in measurement, and a safety accident is caused; the heat transfer resistance can be improved by the scaling substances deposited in the heat exchanger, and the heat exchange efficiency of the heat exchanger is obviously reduced; the fouling substances deposited in the filter can block the filter, so that the flow area of the filter is reduced, and the pressure drop of the filter is increased to force the filter to stop running; the scale substances deposited in the process pipeline can reduce the pipe diameter of the process pipeline, reduce the flow capacity and the like. Meanwhile, the process pipeline is attached to the surface of metal equipment, so that scale electrochemical corrosion is easily generated, and corrosion perforation of the equipment is caused. Therefore, the scale is required to be removed periodically to ensure that the daily work can be smoothly performed.

The chemical cleaning agent is used as a chemical agent for removing scale, and needs to provide a better cleaning effect, so that the efficiency of cleaning work is improved.

Disclosure of Invention

The embodiment of the application provides an ionic liquid alkylation unit scale deposit washing liquid, through the rational ratio of multiple chemical composition, under the lower prerequisite of assurance cost, cooperation cleaning equipment obtains the cleaning performance of preferred, improves the efficiency of cleaning.

In a first aspect, a fouling cleaning solution for an ionic liquid alkylation device is provided, wherein the cleaning solution comprises the following components in percentage by weight:

0.1-2.5 percent of pickling inhibitor, 0-10 percent of alkaline substance, 0-2 percent of surfactant, 0-5 percent of builder, and Fe³⁺0 to 2.5 percent of reducing agent and Fe³⁺0 to 2.5 percent of complexing agent and 75.5 to 99.9 percent of deionized water.

Specifically, the pickling corrosion inhibitor comprises at least one of Lan826, Lan5, Tourette, CM911 or urotropine.

Specifically, the alkaline substance comprises NaOH, KOH and NH₃、Ca(OH)₂Or Na₃PO₄At least one of (1).

Specifically, the surfactant includes at least one of an anionic active agent, a cationic active agent, or a nonionic active agent.

Specifically, the builder comprises at least one of methanol, ethanol and methyl ethyl ether.

In particular, the Fe³⁺The reducing agent comprises Na₂S₂O₃、Na₂SO₃At least one of L-ascorbic acid and sodium L-ascorbate.

In particular, the Fe³⁺The complexing agent comprises at least one of NTA, EDTA-2Na, DTPA, EDTMPS and DETPMS.

In a second aspect, there is provided a method of using a fouling cleaning solution for an ionic liquid alkylation unit based on the first aspect, the method being based on at least two spray absorption towers connected in series, the method comprising the steps of:

cleaning the ionic liquid alkylation device by using the scaling cleaning liquid of the ionic liquid alkylation device, and collecting cleaning waste gas generated during cleaning;

introducing the cleaning waste gas into a first spray absorption tower;

detecting the concentration of HCl in the cleaning waste gas after neutralization and absorption in the spray absorption tower;

when the concentration of HCl in the neutralized and absorbed cleaning waste gas reaches the standard, discharging the neutralized and absorbed cleaning waste gas;

when the HCl concentration in the cleaning waste gas after neutralization and absorption exceeds the standard, introducing the cleaning waste gas after neutralization and absorption into the next spraying absorption tower for neutralization and absorption until the HCl concentration in the cleaning waste gas after neutralization and absorption reaches the standard.

In a third aspect, there is provided a method of using a fouling cleaning solution for an ionic liquid alkylation unit according to the first aspect, the method being based on at least two aeration-liquid mixing units connected in series, the method comprising the steps of:

cleaning the ionic liquid alkylation device by using the scaling cleaning liquid of the ionic liquid alkylation device, and collecting cleaning waste gas generated during cleaning;

introducing the cleaning waste gas into a first gas-liquid mixing device;

detecting the concentration of HCl in the cleaning waste gas after neutralization and absorption in the gas-liquid mixing device;

when the concentration of HCl in the neutralized and absorbed cleaning waste gas reaches the standard, discharging the neutralized and absorbed cleaning waste gas;

when the HCl concentration in the cleaning waste gas after neutralization and absorption exceeds the standard, introducing the cleaning waste gas after neutralization and absorption into the next gas-liquid mixing device for neutralization and absorption until the HCl concentration in the cleaning waste gas after neutralization and absorption reaches the standard.

The beneficial effect that technical scheme that this application provided brought includes:

the application provides an ionic liquid alkylation unit scale deposit washing liquid, through the rational ratio of multiple chemical composition, under the lower prerequisite of assurance cost, the cleaning performance that cooperation cleaning equipment obtained the preferred improves the efficiency of cleaning work.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a spray absorption tower corresponding to a cleaning operation performed by using a fouling cleaning solution of an ionic liquid alkylation apparatus according to embodiment 2 of the present application;

FIG. 2 is a schematic structural diagram of a gas-liquid mixing device corresponding to the cleaning operation performed by using the fouling cleaning solution of the ionic liquid alkylation apparatus provided in example 3 of the present application;

reference numerals:

10. spraying an absorption tower; 11. a filler; 12. a gas inlet channel; 13. a spray liquid receiving tank; 14. a shower head; 15. a cooler; 16. a spray liquid circulating pump; 20. a gas inlet port; 21. a liquid inlet; 22. a filler; 23. a mixing chamber; 24. a mixing dispenser; 25. and a liquid discharge port.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

The embodiment of the application provides an ionic liquid alkylation unit scale deposit washing liquid, through the rational ratio of multiple chemical composition, under the lower prerequisite of assurance cost, cooperation cleaning equipment obtains the cleaning performance of preferred, improves the efficiency of cleaning.

In order to achieve the technical effects, the general idea of the application is as follows:

a scale cleaning liquid for an ionic liquid alkylation device comprises the following components in percentage by weight:

0.1-2.5 percent of pickling inhibitor, 0-10 percent of alkaline substance, 0-2 percent of surfactant, 0-5 percent of builder, and Fe³⁺0 to 2.5 percent of reducing agent and Fe³⁺0 to 2.5 percent of complexing agent and 75.5 to 99.9 percent of deionized water.