Tray cleaning agent filling system for methanol-to-olefin device

Abstract

The invention discloses a methanol-to-olefin device tray cleaning agent filling system which is characterized in that an inlet of a washing pump is provided with a second filling point, the second filling point is arranged at the inlet of the washing pump, and a novel agent pump is respectively connected with a first filling point and the second filling point; chemicals are synchronously injected through a second injection point at the inlet of the washing pump and a first injection point at the tower returning position of the washing oil line; the medicament comprises the following components: benzene compounds, ketone compounds and phenolic compounds, wherein the benzene compounds comprise 7-8 parts of pentamethylbenzene, 6-7 parts of hexamethylbenzene and 5-6 parts of mesitylene; the ketone compound is prepared from the following components in parts by weight: 6 to 7 parts of 6-methyl-3, 5-heptadiene-2-ketone and 2 to 3 parts of 2, 3, 5, 6-tetramethyl tetrahydropyran-4-ketone; the phenolic compound is prepared from 5 to 6 parts of 2, 3, 5, 6-tetramethylphenol. Accumulation of tower tray catalysts and reaction byproducts of the water scrubber and the sewage stripping tower of the methanol-to-olefin device is slowed down, tower tray blockage is effectively reduced, and stable and steady operation of the device is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of chemical equipment cleaning, and particularly relates to a dosing system for tray cleaning agents in a methanol-to-olefins plant. Background Art

[0002] During the operation of a methanol-to-olefins plant, the fixed valve trays of the water wash tower and the wastewater stripper are prone to form stubborn dirt due to catalyst loss and long-term accumulation of side reaction products, resulting in an increase in tray pressure drop and a decrease in mass transfer efficiency, which severely restricts the long-term stable operation of the plant. The existing technologies mainly solve the problem through the following two methods:

[0003] When cleaning with oil-based cleaning agents, it is necessary to frequently add oil-based cleaning agents, which is costly and requires manual cooperation with high-pressure cleaning, resulting in high operational safety risks. Manual on-line high-pressure cleaning requires shutdown, which affects production efficiency, and high-pressure water flushing may damage the tray structure.

[0004] The above methods have the following defects: large consumption of cleaning agents, poor economy; high frequency of manual intervention, significant safety hazards; inability to completely remove emulsified dirt, resulting in repeated blockage of trays.

[0005] Therefore, there is an urgent need to develop a tray cleaning solution that is efficient, low-cost and does not require frequent manual intervention. Summary of the Invention

[0006] Aiming at the problems raised in the above background art, the object of the present invention is to provide a dosing system for tray cleaning agents in a methanol-to-olefins plant.

[0007] To achieve the above technical object, the technical solution adopted by the present invention is as follows:

[0008] A dosing system for tray cleaning agents in a methanol-to-olefins plant, including a dosing system for the water wash tower. The water wash tower system includes a water wash tower, a water wash pump and a new type of chemical pump. A first dosing point is provided at the return point of the oil wash line to the tower at the top of the water wash tower, and a second dosing point is provided at the inlet of the water wash pump. The second dosing point is set at the inlet of the water wash pump. The new type of chemical pump is respectively connected to the first dosing point and the second dosing point, and the agent is injected synchronously through the second dosing point at the inlet of the water wash pump and the first dosing point at the return point of the oil wash line to the tower.

[0009] The agent components include benzene compounds, ketone compounds and phenolic compounds, wherein: the benzene compounds include 7-8 parts of pentamethylbenzene, 6-7 parts of hexamethylbenzene and 5-6 parts of mesitylene; the ketone compounds include 6-7 parts of 6-methyl-3,5-heptadien-2-one and 2-3 parts of 2,3,5,6-tetramethyltetrahydropyran-4-one; the phenolic compounds include 5-6 parts of 2,3,5,6-tetramethylphenol.

[0010] Further defined, it further includes a sewage stripping tower dosing system, and the sewage stripping tower dosing system includes a waste alkali pump, a purified water pump, a water washing pump and a sewage stripping tower. The waste alkali pump is respectively connected to the purified water pump and the water washing pump, and the water washing pump is connected to the sewage stripping tower. The waste new chemical agent is led to the inlet of the purified water pump through the outlet of the waste alkali pump, and then injected into the sewage stripping tower through the water washing pump.

[0011] Further defined, the benzene compounds further include 4-5 parts of 1,2,4,5-tetramethylbenzene, 4-5 parts of 3,4,5-trimethyltoluene, 3-4 parts of 1,2-diisopropylbenzene, 2-3 parts of p-xylene, 2-3 parts of 1-isopropyl-2,4-dimethylbenzene, 2-3 parts of 1,4-dialdehyde-2-methylbenzene, 1-2 parts of m-xylene, 1-2 parts of 1,4-diisopropylbenzene, 1-2 parts of 1-ethyl-4-isopropylbenzene, 1-2 parts of o-isopropylbenzene, 1-2 parts of 5-isopropyl-m-xylene, 1-2 parts of (3-methylbut-2-en-2-yl)benzene, 0.5-1 part of toluene, 0.5-1 part of 1,3-dimethyl-4-ethylbenzene, 0.5-1 part of 2-ethyl-p-xylene, 0.5-1 part of 2-ethyltoluene (o-ethyltoluene), 0.5-1 part of 1,2-dimethyl-4-ethylbenzene and 0.5-1 part of ethylbenzene.

[0012] Further defined, the ketone compounds further include 1-2 parts of 3-methyl-pentene-2-one, 1-2 parts of 2-pentanone, 0.5-1 part of 3,3,5,6-tetramethyl-1-indanone, 0.5-1 part of 4-methyl-4-hexene-3-one, 0.5-1 part of 3-pentanone and 0.5-1 part of 3-hexanone.

[0013] Further defined, the phenolic compounds further include 0.5-1 part of p-tert-amylphenol and 0.5-1 part of 2-tert-butyl-p-cresol.

[0014] Further defined, the pharmaceutical components further include olefin compounds, alkane compounds and naphthalene compounds;

[0015] The olefin compounds include 4-5 parts of 1-acetyl-2-methyl-1-cyclopentene, 1-2 parts of carene and 1-2 parts of 2,4-dimethyl-2,4-heptadiene;

[0016] The alkane compounds include 2-3 parts of cis-1,2-dimethylcyclopropane, and the naphthalene compounds include 2-3 parts of 1-methylnaphthalene, and the naphthalene compounds include 2-3 parts of 1-methylnaphthalene.

[0017] Further defined, the pharmaceutical components further include alcohol compounds, acid compounds and alkyne compounds;

[0018] The alcohol compounds include 2 - 3 parts of verbenol, 1 - 2 parts of 3,4 - dimethylbenzyl alcohol, 1 - 2 parts of 3,5 - dimethylbenzyl alcohol, and 0.5 - 1 part of 3 - methylbenzyl alcohol. The acid compounds include 1 - 2 parts of 1 - methylbarbituric acid. The alkyne compounds include 1 - 2 parts of 4 - ethyl - 3 - nonen - 5 - yne.

[0019] Further defined, the pharmaceutical components further include indene compounds and aldehyde compounds; the pharmaceutical components further include 0.5 - 1 part of acetone cyanohydrin.

[0020] The indene compounds include 1 - 2 parts of 2,3 - dihydro - 1,1,3 - trimethyl - 1H - indene and 1 - 2 parts of 2,3 - dihydro - 4,7 - dimethyl - 1H - indene. The aldehyde compounds include 1 - 2 parts of 3 - (p - tolyl) acrolein, 0.5 - 1 part of safranal, and 0.5 - 1 part of (E,E) - 2,4 - hexadienal.

[0021] Advantages of the present invention:

[0022] 1. It realizes the slowdown of the accumulation of catalysts and reaction by - products on the trays of the water - washing tower and the sewage stripping tower in the methanol - to - olefins unit, effectively reduces the blockage of the trays, and ensures the stable and smooth operation of the unit.

[0023] 2. It reduces the dosage of the wash oil cleaning agent, reduces the annual cleaning cost, reduces the cleaning frequency of the wash oil cleaning agent, and reduces the number and frequency of manual on - line high - pressure cleaning.

[0024] 3. The new pharmaceutical agent quickly strips the catalysts and dirty oil on the tray surface through synergistic emulsification, and the cleaning efficiency is greatly improved compared with the traditional wash oil cleaning agent.

[0025] 4. Safe and environmentally friendly: The pharmaceutical components have no toxic residues and meet the industrial wastewater discharge standards. Brief Description of the Drawings

[0026] The present invention can be further illustrated by the non - restrictive embodiments given in the drawings;

[0027] Figure 1 It is the new pharmaceutical agent injection flow chart of the water - washing tower in the embodiment of the tray cleaning pharmaceutical agent injection system for a methanol - to - olefins unit of the present invention;

[0028] Figure 2 It is the new pharmaceutical agent injection flow chart of the sewage stripping tower in the embodiment of the tray cleaning pharmaceutical agent injection system for a methanol - to - olefins unit of the present invention. Detailed Embodiments

[0029] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work belong to the scope of protection of the present invention.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If this specific posture changes, the directional indications will also change accordingly.

[0031] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] As Figure 1 shown, a methanol-to-olefins unit tray cleaning chemical injection system of the present invention includes a water washing tower injection system. The water washing tower system includes a water washing tower, a water washing pump, and a new chemical pump. A first injection point is provided at the return of the washing oil line to the tower at the top of the water washing tower, and a second injection point is provided at the inlet of the water washing pump. The second injection point is set at the inlet of the water washing pump. The new chemical pump is respectively connected to the first injection point and the second injection point, and chemicals are injected synchronously through the second injection point at the inlet of the water washing pump and the first injection point at the return of the washing oil line to the tower.

[0033] The chemical components include benzene compounds, ketone compounds, and phenolic compounds, where: the benzene compounds include 7-8 parts of pentamethylbenzene, 6-7 parts of hexamethylbenzene, and 5-6 parts of mesitylene; the ketone compounds include 6-7 parts of 6-methyl-3,5-heptadien-2-one and 2-3 parts of 2,3,5,6-tetramethyltetrahydropyran-4-one; the phenolic compounds include 5-6 parts of 2,3,5,6-tetramethylphenol.

[0034] In the practical application of this embodiment, it further includes a sewage stripping tower dosing system. The sewage stripping tower dosing system includes a waste alkali pump, a purified water pump, a water washing pump, and a sewage stripping tower. The waste alkali pump is respectively connected to the purified water pump and the water washing pump. The water washing pump is connected to the sewage stripping tower. The waste new chemical agent is led to the inlet of the purified water pump through the outlet of the waste alkali pump and then injected into the sewage stripping tower through the water washing pump.

[0035] In the practical application of this embodiment, the benzene compounds further include 4 - 5 parts of 1,2,4,5 - tetramethylbenzene, 4 - 5 parts of 3,4,5 - trimethyltoluene, 3 - 4 parts of 1,2 - diisopropylbenzene, 2 - 3 parts of p - xylene, 2 - 3 parts of 1 - isopropyl - 2,4 - dimethylbenzene, 2 - 3 parts of 1,4 - dialdehyde - 2 - methylbenzene, 1 - 2 parts of m - xylene, 1 - 2 parts of 1,4 - diisopropylbenzene, 1 - 2 parts of 1 - ethyl - 4 - isopropylbenzene, 1 - 2 parts of o - isopropylbenzene, 1 - 2 parts of 5 - isopropyl - m - xylene, 1 - 2 parts of (3 - methylbut - 2 - en - 2 - yl)benzene, 0.5 - 1 part of toluene, 0.5 - 1 part of 1,3 - dimethyl - 4 - ethylbenzene, 0.5 - 1 part of 2 - ethyl - p - xylene, 0.5 - 1 part of 2 - ethyltoluene (o - ethyltoluene), 0.5 - 1 part of 1,2 - dimethyl - 4 - ethylbenzene, and 0.5 - 1 part of ethylbenzene.

[0036] In the practical application of this embodiment, the ketone compounds further include 1 - 2 parts of 3 - methyl - penten - 2 - one, 1 - 2 parts of 2 - pentanone, 0.5 - 1 part of 3,3,5,6 - tetramethyl - 1 - indanone, 0.5 - 1 part of 4 - methyl - 4 - hexen - 3 - one, 0.5 - 1 part of 3 - pentanone, and 0.5 - 1 part of 3 - hexanone.

[0037] In the practical application of this embodiment, the phenolic compounds further include 0.5 - 1 part of p - tert - amylphenol and 0.5 - 1 part of 2 - tert - butyl - p - cresol.

[0038] In the practical application of this embodiment, the chemical agent components further include olefin compounds, alkane compounds, and naphthalene compounds;

[0039] The olefin compounds include 4 - 5 parts of 1 - acetyl - 2 - methyl - 1 - cyclopentene, 1 - 2 parts of carene, and 1 - 2 parts of 2,4 - dimethyl - 2,4 - heptadiene;

[0040] The alkane compounds include 2 - 3 parts of cis - 1,2 - dimethylcyclopropane, and the naphthalene compounds include 2 - 3 parts of 1 - methylnaphthalene. The naphthalene compounds include 2 - 3 parts of 1 - methylnaphthalene.

[0041] In the practical application of this embodiment, the pharmaceutical components further include alcohol compounds, acid compounds and alkyne compounds;

[0042] The alcohol compounds include 2-3 parts of verbenol, 1-2 parts of 3,4-dimethylbenzyl alcohol, 1-2 parts of 3,5-dimethylbenzyl alcohol and 0.5-1 part of 3-methylbenzyl alcohol. The acid compounds include 1-2 parts of 1-methylbarbituric acid. The alkyne compounds include 1-2 parts of 4-ethyl-3-nonen-5-yne.

[0043] In the practical application of this embodiment, the pharmaceutical components further include indene compounds and aldehyde compounds; the pharmaceutical components further include 0.5-1 part of acetone cyanohydrin.

[0044] The indene compounds include 1-2 parts of 2,3-dihydro-1,1,3-T-1H-indene and 1-2 parts of 2,3-dihydro-4,7-dimethyl-1H-indene. The aldehyde compounds include 1-2 parts of 3-(p-tolyl)acrolein, 0.5-1 part of crocetin aldehyde and 0.5-1 part of (E,E)-2,4-hexadienal.

[0045] Example 1: Pharmaceutical injection into the water wash tower

[0046] Pharmaceutical preparation: According to benzene compounds: 7-8 parts of pentamethylbenzene, 6-7 parts of hexamethylbenzene and 5-6 parts of mesitylene; ketone compounds: 6-7 parts of 6-methyl-3,5-heptadien-2-one, 2-3 parts of 2,3,5,6-tetramethyltetrahydropyran-4-one; phenolic compounds: 5-6 parts of 2,3,5,6-tetramethylphenol, mix benzene compounds, ketone compounds and phenolic compounds according to the component ratio and stir until a homogeneous solution.

[0047] As Figure 1 shown, injection operation: Inject the pharmaceutical through injection point 1 (where the wash oil line returns to the tower) at a flow rate of 2 L / min; synchronously inject the pharmaceutical through injection point 2 (the inlet of the water wash pump) at a flow rate of 1.5 L / min; operation monitoring: Monitor the tray pressure difference in real time. If the pressure difference exceeds 1 kPa, automatically increase the injection volume by 10%-15%.

[0048] Example 2: Pharmaceutical injection into the sewage stripping tower

[0049] As Figure 2 shown, process setting: The outlet of the waste alkali pump (P2114B) is connected to the inlet of the purified water pump (P2113A); inject the pharmaceutical into the sewage stripping tower through the water wash water pump (P2113B) at a flow rate of 3 L / min;

[0050] Temperature control: Maintain the temperature in the tower at 65 °C and the contact time at 45 minutes;

[0051] Effect verification: After cleaning, the tray pressure drop decreased from 3.2 kPa to 0.4 kPa, and the fouling stripping rate was ≥ 95%.

[0052] The component table of the new chemical agent is as follows:

[0053]

[0054]

[0055]

[0056] The above embodiments are only used to exemplarily illustrate the principles and effects of the present invention, rather than to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A methanol to olefins unit tray cleaning agent filling system, characterized in that: It includes a water washing tower filling system, the water washing tower system includes a water washing tower, a water washing pump and a new type of chemical pump, the top of the water washing tower is provided with a first filling point at the return of the washing oil line to the tower, the inlet of the water washing pump is provided with a second filling point, the second filling point is arranged at the inlet of the water washing pump, the new type of chemical pump is connected with the first filling point and the second filling point respectively, and the chemical is injected synchronously through the second filling point at the inlet of the water washing pump and the first filling point at the return of the washing oil line to the tower; The pharmaceutical components include benzene compounds, ketone compounds and phenolic compounds, wherein the benzene compounds include 7 to 8 parts of pentamethylbenzene, 6 to 7 parts of hexamethylbenzene and 5 to 6 parts of mesitylene; the ketone compounds include 6 to 7 parts of 6-methyl-3,5-heptadien-2-one and 2 to 3 parts of 2,3,5,6-tetramethyltetrahydropyran-4-one; and the phenolic compounds include 5 to 6 parts of 2,3,5,6-tetramethylphenol.

2. A methanol to olefins unit tray cleaning agent filling system according to claim 1, characterized in that: It also includes a sewage stripping tower filling system, which includes a waste alkali pump, a purification water pump, a washing water pump and a sewage stripping tower. The waste alkali pump is connected to the purification water pump and the washing water pump respectively, and the washing water pump is connected to the sewage stripping tower. The waste new agent is led to the purification water pump inlet through the waste alkali pump outlet and then injected into the sewage stripping tower through the washing water pump.

3. The methanol to olefins unit tray cleaning agent filling system according to claim 1, characterized in that: The benzene compound also includes 4 to 5 parts of 1,2,4,5-tetramethylbenzene, 4 to 5 parts of 3,4,5-trimethyltoluene, 3 to 4 parts of 1,2-diisopropylbenzene, 2 to 3 parts of p-xylene, 2 to 3 parts of 1-isopropyl-2,4-dimethylbenzene, 2 to 3 parts of 1,4-dialdehyde-2-methylbenzene, 1 to 2 parts of m-xylene, 1 to 2 parts of 1,4-diisopropylbenzene, and 1 to 2 parts of 1-ethyl-4-isopropylbenzene. , 1 to 2 parts of o-isopropylbenzene, 1 to 2 parts of 5-isopropylmeta-xylene, 1 to 2 parts of (3-methylbut-2-en-2-yl)benzene, 0.5 to 1 part of toluene, 0.5 to 1 part of 1,3-dimethyl-4-ethylbenzene, 0.5 to 1 part of 2-ethylparaxylene, 0.5 to 1 part of 2-ethyltoluene (o-methylethylbenzene), 0.5 to 1 part of 1,2-dimethyl-4-ethylbenzene and 0.5 to 1 part of ethylbenzene.

4. A methanol to olefins unit tray cleaning agent filling system according to claim 1, characterized in that: The ketone compounds also include 1 to 2 parts of 3-methyl-pentene-2-one, 1 to 2 parts of 2-pentanone, 0.5 to 1 part of 3,3,5,6-tetramethyl-1-indole, 0.5 to 1 part of 4-methyl-4-hexene-3-one, 0.5 to 1 part of 3-pentanone and 0.5 to 1 part of 3-hexanone.

5. The methanol to olefins unit tray cleaning agent filling system according to claim 1, characterized in that: The phenolic compound also includes 0.5 to 1 part of p-tert-amylphenol and 0.5 to 1 part of 2-tert-butyl-p-cresol.

6. The methanol to olefins unit tray cleaning agent filling system according to claim 1, characterized in that: The pharmaceutical composition also includes olefin compounds, alkane compounds and naphthalene compounds; The olefin compound includes 4 to 5 parts of 1-acetyl-2-methyl-1-cyclopentene, 1 to 2 parts of carene and 1 to 2 parts of 2,4-dimethyl-2,4-heptadiene; The alkane compound includes 2 to 3 parts of cis-1,2-dimethylcyclopropane, the naphthalene compound includes 2 to 3 parts of 1-methylnaphthalene, and the naphthalene compound includes 2 to 3 parts of 1-methylnaphthalene.

7. The methanol to olefins unit tray cleaning agent filling system according to claim 1, characterized in that: The pharmaceutical composition also includes alcohol compounds, acid compounds and acetylene compounds; The alcohol compound includes 2 to 3 parts of verbenol, 1 to 2 parts of 3,4-dimethylbenzyl alcohol, 1 to 2 parts of 3,5-dimethylbenzyl alcohol and 0.5 to 1 part of 3-methylbenzyl alcohol, the acid compound includes 1 to 2 parts of 1-methylbarbituric acid, and the acetylene compound includes 1 to 2 parts of 4-ethyl-3-nonene-5-yne.

8. The methanol to olefins unit tray cleaning agent filling system according to claim 1, characterized in that: The pharmaceutical composition also includes an indene compound and an aldehyde compound; the pharmaceutical composition also includes 0.5 to 1 part of acetone cyanohydrin; The indene compound includes 1 to 2 parts of 2,3-dihydro-1,1,3-T-1H-indene and 1 to 2 parts of 2,3-dihydro-4,7-dimethyl-1H-indene, and the aldehyde compound includes 1 to 2 parts of 3-(p-tolyl)acrolein, 0.5 to 1 part of safranal and 0.5 to 1 part of (E,E)-2,4-hexadienal.

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