WO2015123825A1

WO2015123825A1 - Purification assistant for coal chemical industry production, and uses thereof in coal chemical industry production

Info

Publication number: WO2015123825A1
Application number: PCT/CN2014/072252
Authority: WO
Inventors: 张征北
Original assignee: 张征北
Priority date: 2014-02-19
Filing date: 2014-02-19
Publication date: 2015-08-27

Abstract

Disclosed are a purification assistant for coal chemical industry production and uses thereof in the coal chemical industry production. The purification assistant for coal chemical industry production comprises 90 to 99 parts of N-Polyoxyethylated-N-oleylamine and 1 to 5 parts of fatty amine in parts by weight. The purification assistant has the following effects: 1) the content of suspended solids in ammonia water and phenol water is greatly reduced, so that separation effects of coal tar and coal cinder in ammonia water and phenol water are good, and accordingly, the loss of coal tar is reduced and the yield of the coal tar is increased; 2) the water content in the coal tar is reduced; 3) a large quantity of sediments such as oil slag in each tank body and an evaporator tank heat-exchanging system are greatly cleaned, so that the blockage phenomenon is avoided, the system cleaning frequency is reduced, and the service life of a device is extended; and 4) the COD and phenol content in gasification wastewater are reduced, and raw coke oven gas is cleaned. Therefore, the purification assistant provided in the present invention is a high-efficiency product capable of reducing the viscosity of coal tar and reducing water content of an oil product.

Description

Purification aid for coal chemical industry and application in 3⁄4s coal chemical industry

TECHNICAL FIELD The present invention relates to the field of coal chemical production, and in particular to a purification aid for coal chemical production and its application in coal chemical production. BACKGROUND OF THE INVENTION In the coal chemical production industry, the degree of separation of coal tar suspended in ammonia water and phenol water is an important indicator of concern in the production of gasification plants and coking plant chemical production plants. If the separation of coal tar in ammonia or phenol water is not good, it will not only affect the production of coal tar in the liquid product separation system, but also affect the recovery system of ammonia water and phenol water, resulting in fouling of the tray in the recovery system, increasing the cleaning. The maintenance cost of the trays makes the production impossible, and the production cost is increased. In addition, due to the blockage of the tray, the heat consumption of the distillation system is greatly increased, the production capacity of the equipment is reduced, the equipment is corroded, and even the high pressure of the equipment is easily caused, causing major safety accidents and the like. The above problems have always been a real problem that plagues production enterprises such as coal-to-gas, coal-to-liquid, blue-carbon, and coking plants. Therefore, how to separate the coal tar and coal dust from the ammonia water and the phenol water to prevent the occurrence of blockages in the tray during the coal production process has become an urgent problem to be solved. SUMMARY OF THE INVENTION The present invention is directed to a purification aid for coal chemical production and its application in coal chemical production, which can effectively remove coal tar contained in ammonia water, phenol water and waste gas. The separation effect is good. In order to achieve the above object, according to one aspect of the present invention, a purification aid for coal chemical production is provided, which comprises 90 to 99 parts of oleylamine polyoxyethylene ether and 1 to 5 parts of aliphatic amine by weight. . Further, in parts by weight, 94 to 99 parts of oleyl polyoxyethylene ether and 1 to 3 parts of fatty amine are included. Further, 99 parts of oleyl polyoxyethylene ether and 1 part of a fatty amine are included in parts by weight. Further, the fatty amine is selected from one or more of a fatty primary amine, a secondary fatty amine, a fatty tertiary amine, and a fatty polyamine, preferably a primary fatty amine. Further, the oleylamine polyoxyethylene ether is oleylamine polyoxyethylene ether 5EO~20EO. According to another aspect of the present invention, there is provided the use of any of the above-described purification aids for coal chemical production in coal chemical production. Further, a purification aid is added to the suction port of the circulating water pump of the recycling cycle system in the coal chemical production. Further, a purifying aid is added to the recycling system by using a high-pressure metering pump at the suction port of the circulating water pump. Further, a purification aid is added to the recycling cycle system in the coal chemical production by successively increasing the addition manner. Further, the successive incremental addition manners include: Sl, adding a purification aid consuming 1~3 ppm of circulating water in the recycling circulation system to the recycling cycle system for 10 to 15 days; S2, adding to the recycling cycle to the recycling cycle The purification agent with a circulating water volume of 3~5ppm in the system is kept for 25~30 days; and S3, the purification auxiliary agent which accounts for 5~10ppm of circulating water in the recycling system is added to the recycling system until the circulating water in the recycling system The coal tar content has dropped to 20% to 30%. By applying the technical scheme of the present invention, the purification auxiliary consisting of oleylamine polyoxyethylene ether and fatty amine provided by the invention is added to the recycling circulation system of the coal chemical production process to purify the circulating water, because the purification auxiliary can The small liquid bead of the dispersed phase of the emulsion is aggregated to form a large droplet, and finally the oil and water in the circulating water are separated into two phases to thereby purify the object. Therefore, the purification auxiliary can effectively remove the coal chemical production process. The coal tar and coal dust contained in ammonia water, phenol water and waste gas are high-efficiency products that can reduce the viscosity of coal tar and reduce the moisture content of oil. The specific effects are as follows:

1) The separation effect of coal tar and cinder in ammonia water and phenol water is good, which can greatly reduce the coal tar content in the remaining ammonia water and phenol water (if the coal tar content in the remaining ammonia water is not 600~1000 mg when the purification aid is not used) l, the coal tar content in the residual ammonia water after using the purification aid of the invention is 200-300 mg / liter, which reduces the loss of coal tar, improves the recovery rate of coal tar, increases the output of coal tar; 2) effectively reduces The content of suspended solids in ammonia water and phenol water makes the separation effect of coal tar and coal dust obvious; 3) When the purification aid is not used, the coal tar storage tank needs 48 hours to reduce the moisture content in coal tar to 4 Below %, after using the purification aid of the invention, the moisture content in the coal tar can be reduced to less than 4% in only 12 hours, which greatly reduces the water content and viscosity in the coal tar; 4) For the purification and recovery workshop The oil slag accumulated in the pipeline, heat exchanger, tray and valve gate valve has the function of cleaning and stripping, so that the deposits such as oil slag in each tank body and the steam tank heat exchange system are largely cleaned, avoiding The blockage of the various trays, separators and heat exchangers reduces the frequency of the cleaning system, improves the processing effect of the equipment, prolongs the service life of the equipment, and reduces production without repair and maintenance equipment, ensuring the economics of the enterprise. Maximize the benefits, and also ensure the safe production of each workshop; 5) Reduce the COD and phenol content in the gasification wastewater, and have a positive effect on maintaining COD stability, while significantly reducing the odor, bringing a huge environmental protection Benefits; cleaned up the waste gas, reduced the load on the waste gas purification system, and benefited the quality of the end product 6) Avoiding the problem of scale formation in each tray in the coal production system, saving steam consumption, reducing the deposition of coal tar on the production system, improving the heat transfer effect of each system, and ensuring production Continuity of work at the optimum design value. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in FIG. In the drawings: FIG. 1 is a schematic flow chart of an ammonia water recovery cycle system in a coal chemical production process according to an exemplary embodiment of the present invention. The specific lung type needs to be described that the features in the embodiments and the embodiments in the present application can be combined with each other without conflict. The invention will be described in detail below with reference to the embodiments. In order to better solve the problem of excessive separation of coal tar and coal dust suspended in ammonia water and phenol water in the recycling system of coal production in the prior art, the production of coal tar in the liquid product separation system is affected and the pipeline is easily blocked. The invention provides a purification aid for coal chemical production, which comprises 90-98 parts of oleylamine polyoxyethylene ether and 1 to 5 parts by weight. Fatty amine. The purification auxiliary consisting of oleylamine polyoxyethylene ether and fatty amine provided by the invention is added to the recycling cycle system of the coal chemical production process to purify the circulating water, since the purification auxiliary agent can disperse the dispersed phase of the emulsion The liquid bead aggregates to form large droplets, and finally the oil and water in the circulating water are separated and chromatographed to achieve the purpose of purification. Therefore, the purification aid can effectively remove ammonia water, phenol water and waste gas generated in the coal chemical production process. The coal tar and coal dust contained in it are high-efficiency products that can reduce the viscosity of coal tar and reduce the moisture content of oil. The specific effects are as follows:

1) The separation effect of coal tar and cinder in ammonia water and phenol water is good, which can greatly reduce the coal tar content in the remaining ammonia water and phenol water (if the coal tar content in the remaining ammonia water is not 600~1000 mg when the purification aid is not used) l, the coal tar content in the residual ammonia water after using the purification aid of the invention is 200-300 mg / liter, which reduces the loss of coal tar, improves the recovery rate of coal tar, increases the output of coal tar; 2) effectively reduces The content of suspended solids in ammonia water and phenol water decreased, which made the separation effect of coal tar and coal dust obvious; 3) When the purification auxiliaries were not used, it took 48 hours for the coal tar storage tank to reduce the moisture content in coal tar to 4 Below %, after using the purification aid of the invention, the moisture content in the coal tar can be reduced to less than 4% in only 12 hours, the moisture content in the coal tar is greatly reduced, and the viscosity of the coal tar is lowered; 4) And recycling workshop piping, heat exchangers, trays and valves The oil slag accumulated in the gate valve has the function of cleaning and stripping, so that the deposits of oil slag and the like in each tank body and the steam tank heat exchange system are largely cleaned, thereby avoiding clogging of each tray, separator and heat exchanger, and reducing the clogging phenomenon. The frequency of cleaning the system improves the processing effect of the equipment, prolongs the service life of the equipment, so that the production will not be reduced due to maintenance and maintenance equipment, ensuring the maximum economic benefits of the enterprise, and ensuring the safe production of each workshop; 5) Reduce the COD and phenol content in the gasification wastewater, and have a positive effect on maintaining COD stability, while the odor is also significantly reduced, bringing great environmental benefits; at the same time cleaning the waste gas, reducing the load of the waste gas purification system It is beneficial to improve the quality of the end products; 6) avoiding the fouling of each tray in the coal production system, saving steam consumption; reducing the deposition of coal tar on the production system and improving the heat transfer of each system The effect ensures continuity of production at the optimum design value. Further preferably, it comprises 94 to 98 parts of oleyl polyoxyethylene ether and 1 to 3 parts of a fatty amine in parts by weight. Most preferably, the purification aid comprises 98 parts oleyl polyoxyethylene ether and 1 part fatty amine in parts by weight. The oleylamine polyoxyethylene ether has excellent emulsification, dispersion, solubilization, antistatic, lubrication and corrosion inhibition capabilities, and also has a certain bactericidal ability. The present invention employs a fatty amine added to oleylamine polyoxyethylene ether because the fatty amine can lower the surface tension of water, increase the solubility of organic compounds, and on the other hand act as a solvent. The fatty amine used in the present invention refers to a large class of organic amine compounds having a carbon chain length in the range of C ₈ to C ₁₂ . According to an exemplary embodiment of the present invention, the fatty amine is selected from the group consisting of primary aliphatic amines and secondary fatty amines. One or more of a fatty tertiary amine and a fatty polyamine are preferably primary fatty amines. The type of fatty primary amine, fatty secondary amine and fatty tertiary amine depends on the number of hydrogen atoms in the amine which are substituted by thiol groups. It is preferred to use primary aliphatic amines mainly considering the addition of fatty primary amines to ethylene oxime. It is a nonionic surfactant, and the oleylamine polyoxyethylene ether used in the present invention is also a nonionic surfactant-polyether-amine polycondensation, and a good synergy between the primary aliphatic amine and the oleylamine polyoxyethylene ether. The role of the use of fatty secondary amines has the commonalities and advantages of other fatty secondary amines, fatty tertiary amines and fatty polyamines. The invention combines oleylamine polyoxyethylene ether with fatty amine in a certain ratio to obtain a purification auxiliary agent with better functions of demulsification, dispersion, viscosity reduction, dehydration and flocculation, and the purification auxiliary agent Applied to the recycling system of coal chemical production, coal tar in ammonia water or phenol water can be separated well, and the moisture content in the separated coal tar is the lowest. When the purification aid is used for demulsification purification of ammonia or phenol water in coal chemical production, the demulsification temperature is generally above 70 °C. Among them, the oleylamine polyoxyethylene ether may be a commercially available product, or may be synthesized by a conventional method using oleylamine and epoxy oxime as a raw material, and in view of demulsification and dispersion effect, it is preferably used in a purity of 95% to 99%. Oil amine is used as a raw material for synthetic oleylamine polyoxyethylene ether. In the present invention, it is preferred to use oleylamine polyoxyethylene ether 5EO~20EO, that is, 5-20 epoxy oxime. If the EO content of the oleyl polyoxyethylene ether used is less than 5, excessive oleophilicity may occur, resulting in excessive recovery of light tar into heavy tar, so that light tar is reduced. Yield; if the EO number of oleyl polyoxyethylene ether is higher than 20, excessive hydrophilicity will occur, resulting in high moisture content of tar, The quality of tar is degraded. Therefore, after comprehensive consideration, the present invention uses oleylamine polyoxyethylene ether 5EO~20EO mixed with a fatty amine, and applies the purification aid obtained after mixing to the coal chemical production, which can more effectively remove the coal chemical production process. Coal tar and coal dust contained in ammonia water, phenol water and waste gas. The purification aid obtained by the technical scheme of the invention has the following characteristics: deep amber to pale yellow liquid, odorless, flash point ≥90.5 °C and pour point ≤-12.3 ° C, at standard atmospheric pressure and 15.6 ° C, The ratio of the specific gravity of the purification aid to water is 0.95 0.99, and the viscosity is 1045 to 1067 Pa*S. According to another aspect of the present invention, there is provided the use of any of the above-described purification aids for coal chemical production in coal chemical production. The purification aid can be added to any system in the coal chemical production as needed, in order to better remove the coal tar and coal dust in the ammonia water and the phenol water, preferably, the circulating water pump suction in the recovery circulation system in the coal chemical production Add a purification aid to the mouth. By adding a purification aid to the suction port of the circulating water pump, a wider polymerization effect can make the agent mix more fully. Specifically, a purification aid is added to the recovery cycle system by using a high-pressure metering pump at the suction port of the circulating water pump. The invention adds the purification aid to the circulating water (ammonia or phenol water) recovery circulation system by using a high-pressure metering pump in the circulating water (ammonia or phenol water) pump suction port, and firstly ensures the continuity of the purification auxiliary addition, so that The coal tar removal is more thorough. Secondly, the high-pressure metering pump is used to continuously pump the purification auxiliaries, which is beneficial to the enterprise to continuously recover the continuously produced coal tar and has higher recovery efficiency. Considering that the purification aid has a good cleaning effect on the scale deposited in the recycling cycle system, in order to avoid various clogging phenomena caused by rapid cleaning after the addition of the purification aid, it is preferred to adopt a successive incremental addition method to the coal. A purification aid is added to the recycling system in the chemical production. By slowly and incrementally adding purification aids at the beginning, the amount of purification aid is gradually increased while analyzing the test data and ensuring that the individual heat exchangers and trays are not clogged. The purification aid provided by the invention is applied to the ammonia water or phenol water recovery circulation system in the coal chemical production process, thereby improving the separation degree of coal tar and coal dust in the ammonia water or the phenol water, and effectively solving the ammonia and phenol recovery system. The problem of blockage of the trays prolongs the maintenance period and service life of the equipment, and has the advantages of low production cost, low energy consumption and high production safety factor. Further preferably, the incrementally increasing adding manner comprises: Sl, adding a purification auxiliary agent that accounts for 1-3 ppm of circulating water in the recycling cycle system to the recycling cycle system for 10 to 15 days; S2, adding to the recycling system for recycling The purification agent with circulating water volume of 3~5ppm in the circulation system is kept for 25~30 days; and S3, the purification auxiliary agent which accounts for 5~10ppm of circulating water in the recycling system is added to the recycling system until the circulating water in the recycling system The coal tar content in the plant has dropped to 20% to 30%. Advantageous effects of the present invention will be further described below in conjunction with specific embodiments. Examples 1 to 9 The oleylamine polyoxyethylene ether and the primary aliphatic amine were mixed, and the oleylamine polyoxyethylene ether was oleylamine polyoxyethylene ether 5-20EO. The specific raw material fractions are shown in Table 1. Table 1

The purification aids prepared in Examples 1 to 9 were subjected to performance tests in which the specific gravity and viscosity were tested under standard atmospheric pressure at a temperature of 15.6 ° C. The specific test results are shown in Table 2. Table 2

The purification agent prepared by the invention has better separation and impurity removal effects according to the following experiments. Example 10 In the production process of the gas plant of Zhongmei Longhua Harbin Coal Chemical Co., Ltd., the phenol water was purified by adding the purification aid in the first embodiment of the present invention to the recovery cycle system. The specific process is as follows: The crude gas from the gas plant exits the gas outlet and passes through the circulating water pump to enter the phenol water recovery cycle system of high temperature phenol water spray. In the phenol water recycling phenol water recycling cycle system, the high-pressure metering pump is used to add the purification assistant to the phenol water recovery circulation system in a manner of increasing the amount of addition at the suction port of the circulating water pump. The specific addition method is as follows: First, the recovery method is as follows: Adding 3 ppm of phenolic water circulation purification agent to the recycling system for 15 days; secondly, adding 5 ppm of phenolic water circulation purification agent to the recycling system for 30 days; A purification aid which accounts for 10 ppm of phenol water circulation in the circulation system is added to the recovery cycle system until the coal tar content in the phenol water circulating water volume in the recovery cycle system is reduced to 20%. The phenol water added to the purification aid passes through the heat exchanger (remaining heat recovery) --- - casing heat exchanger --- tube heat exchanger -- flash tank -- -- - - coal Tar phenol water separator ----heat exchanger --- -- light oil separator --- -- buffer tank --- --- oil water filter (also known as dual media filter) --...large Storage tanks...-light oil separators...air flotation devices...large buffer tanks...-deacidification towers...-heat exchangers...deamination towers...-heat exchangers...extraction...heat exchangers...distilled water Tower... - - Biochemical treatment. After that, the conventional oil and fat titration method was used to detect the coal tar content in the phenol water of the coal tar phenol water separator, the oil water filter and the distilled water tower, and the data were 0.2 g/L, 0.15 g/L and 0.1, respectively. g/L, the maintenance period of the whole set of equipment is 3~5 years. Example 11 The operation steps and methods were the same as those in Example 10 except that the purification aid prepared in Example 3 was used in Example 11, and the content of the purification assistant added was different, as follows: In the production process of the gas generating plant of Harbin Coal Chemical Co., Ltd., the phenol water is purified by adding the purification aid in the third embodiment of the present invention to the recycling cycle system. The specific process is as follows: The crude gas from the gas plant exits the gas outlet and passes through the circulating water pump into the phenol water recovery cycle system of high-temperature phenol water spray. In the phenol water recovery cycle system of high-temperature phenol water spray, the inhalation of the circulating water pump The high-pressure metering pump is used to add the purification aid to the phenol water recovery cycle system in increments of the added amount. The specific addition method is as follows:

Sl, adding a purification aid to the recycling cycle system of phenol water circulation amount of 1 ppm to the recovery cycle system for 10 days; S2, adding to the recovery cycle system a purification aid of 3 ppm of the phenol water circulation amount in the recovery cycle system, keeping 25 S3. Adding 5 ppm of phenol water circulation to the recycling system to the recycling system until the coal tar content in the circulating water system is reduced to 30%, and the purification process is completed. The phenol water added to the purification aid passes through the heat exchanger (remaining heat recovery) --- - casing heat exchanger --- tube heat exchanger -- flash tank -- -- - - coal Tar phenol water separator ----heat exchanger --- -- light oil separator --- -- buffer tank --- --- oil water filter (also known as dual media filter) --...large Storage tanks...-light oil separators...air flotation devices...large buffer tanks...-deacidification towers...-heat exchangers...deamination towers...-heat exchangers...extraction...heat exchangers...distilled water Tower... - - Biochemical treatment. Afterwards, conventional oil and fat titration methods are used for the initial coal tar phenol water separator, oil water filter and distilled water tower. The coal tar content in the phenol water was tested, and the data were 0.24 g/L, 0.18 g/L and 0.4 g/L, respectively. The maintenance period of the whole set of equipment was 1 to 3 years. Comparative Example 1 The operation was the same as in Example 10 except that no purification aid was added to Comparative Example 1. In the production process of the gas-making workshop of China Coal Longhua Harbin Coal Chemical Co., Ltd., the circulating phenol water in the recycling system is purified according to the traditional method. The specific process is as follows: The crude gas of the gas plant After exiting the gas outlet, the phenol water recovery system of the high-temperature phenol water spray is passed through the circulating water pump, and then passes through the heat exchanger (remaining heat recovery) --- casing heat exchanger --- tube heat exchanger -- --Flash tank -- --- - Coal tar phenol water separator -- -- Heat exchanger ... Light oil separator ... -- Buffer tank ... Oil water filter is also called double medium filter ... -- Large storage Tank...-light oil separator--air flotation device...large buffer tank--deacidification tower--heat exchanger---deamination tower----heat exchanger---extraction- - Heat exchanger - distilled water tower -... - Biochemical treatment. The conventional oil and fat titration method is used to detect the coal tar content in the phenol water of the coal tar phenol water separator, the oil water filter and the distilled water tower, respectively, wherein the conventional oil and fat titration method is used for the initial coal. The coal tar content in the phenol water of the tar phenol water separator, the oil-water filter and the distilled water tower were measured at 2.0 g/L, 1.5 g/L and 3 g/L, respectively, and the maintenance period of the whole set of equipment was 6 months. Example 12 The following uses the purification aid of the present invention to carry out on-line purification treatment of the ammonia water recovery cycle in the coal chemical production process, as follows: In the production process of the chemical production recycling workshop of Wuhai Taihe Coal Coking Group Co., Ltd., the present invention will be The purification aid in the embodiment 1 is added to the ammonia water recovery cycle system, wherein FIG. 1 is a flow chart of the equipment of the ammonia water recovery cycle system, where 1 represents the primary cooler, 2 represents the gas-liquid separator, 3 represents the waste gas, and 4 represents The remaining ammonia water tank, 5 represents the circulating water pump, 6 represents the ammonia water storage tank, 7 represents the coal tar ammonia water separation large tank, 8 represents the coal tar intermediate tank, and 9 represents the purification aid addition point. The ammonia water is circulated between the coal tar ammonia water separation tank 7, the ammonia water tank 6, the circulating water pump 5, the waste gas 3, and the gas-liquid separator 2 to recover and separate the ammonia water and the coal tar contained therein. The separated coal tar enters the coal tar intermediate tank 8, and the separated ammonia water enters the remaining ammonia water tank 4. Wherein, the purifying aid is added by the metering pump in a stepwise increment manner at the point of addition of the purifying aid at the suction port of the circulating water pump, and the specific adding manner is as follows: Sl, adding to the recycling loop system at the point of addition of the purifying aid 9 The purification auxiliaries which account for 3ppm of ammonia circulation in the recycling system are kept for 15 days; S2, the purification auxiliaries which account for 5ppm of ammonia circulation in the recovery circulatory system are added to the ammonia circulation system for 30 days; S3, to the recycling system A purification aid containing 10 ppm of ammonia water in the recycling system was added for 15 days. Before the addition of the drug, the ammonia water contains a large amount of suspended solids and coal tar. The color of the ammonia water is turbid. After 60 days of purification by the purification aid of the present invention, the color of the ammonia water is transparent pale orange (ammonia color), and the test contains almost no coal. Tar, ammonia is more pure. The coal tar finally separated in the first embodiment was tested, and it was found that the separated coal tar moisture content was reduced from 4% to 5% in the prior art without adding a purification aid to 0.6 to 1.0%. The purifying agent of the invention can quickly separate the coal tar from the ammonia water in only 60 days, and the separated coal tar has a water content of only 1.6%, which is as high as 85% compared with the prior art. The purification aid of the invention has better demulsification and dehydration effects on coal tar in ammonia water, and has high dehydration speed and high efficiency. The separated waste gas was detected by a gas chromatograph, and it was found that the waste gas became purer than before. Before the purification aid of the present invention is used, when the electric coal tar is deactivated for half an hour, a large amount of coal tar will flow out in the electric coal tar, and flow to the sulfur tank, when the purification aid of the invention is used. There is only a small amount of foam outflow during the half hour of electric arrest, and there is basically no coal tar outflow. This shows that the amount of coal tar in the waste gas is reduced, and the coal tar has been cleaned in the front section. After purification, the waste gas is very clean, and the cleaned waste gas ensures the combustion effect of the recycled gas and the subsequent utilization of the waste gas. Before the purification aid of the present invention is used, a large amount of steam is required to clean the coal tar accumulated inside the primary cooler every month. After purification by the purification aid of the present invention for 60 days, steam cleaning is not required, and the cooling effect is stable. It can be seen that after using the purification aid of the invention, the monitoring indicators in the coal chemical production can better meet the production demand. Packing benzene tower is an important chemical equipment for recovering crude benzene from waste gas. Before the purification auxiliaries of the invention are used, the coal gas in the coal chemical production is not pure, and the coal tar and naphthalene in the waste gas block the filler seriously. , resulting in increased resistance of equipment, up to 1800Pa, making crude benzene production only 15 tons / day, seriously affecting the recovery of crude benzene, causing serious economic losses. After the purification aid is used, the coal tar content in the waste gas is significantly reduced, and the waste gas is relatively pure, so that the plugged coal tar and naphthalene accumulated on the original packed benzene tower are effectively cleaned, the equipment resistance is reduced to 1000 Pa, and This resistance is maintained at all times and crude benzene production is increased to 19-20 tons/day. It can be seen that the use of the purification aid of the invention greatly reduces the frequency of cleaning the benzene washing tower, reduces the labor intensity of the worker, increases the recovery amount of the crude benzene, and has considerable economic benefits. The cleaning aid of the invention also plays a large role in the cleaning of the pipeline. Before the purification aid of the invention is used, the gas collecting pipe located above the coke oven is often prevented from being sprayed by the coal tar and coal tar slag blocking nozzle. The effect is that the artificial clearing nozzle is needed every 3~5 days. After using the purifying aid of the invention, the frequency of still cleaning is greatly reduced, and the phenomenon that the nozzle is blocked and cannot be sprayed does not occur, and the gate valves and valves are not Manually repaired due to blockage of coal tar and coal tar slag, the separated coal tar slag also became looser and less lustrous, indicating a significant reduction in oil content. Before the purification aid of the present invention is used, a certain amount of coal tar is excluded periodically (for example, every week) under the ammonia distillation tower, and the ammonia distillation tower is treated for 60 days by adding a purification aid, and it is not necessary to exclude coal tar. Before the purification aid of the present invention is used in the prior art, the COD (chemical oxygen absorption) of the wastewater is 200 mg/L, and after purification treatment, the COD of the wastewater is controlled between 100 and 150 mg/L, which is reduced by nearly 25%. 50%. The use of the purification aid of the invention not only reduces the moisture content in the coal tar, but also increases the coal tar yield: before the purification aid of the invention is used, the coal tar recovery ratio is 0.033, and the purification aid of the invention is used for 60 days. The coal tar recovery ratio is increased to 0.0342. According to the calculation of coal tar output of 2,000 tons per month, the coal tar has a moisture content of 4% and the average moisture content of coal tar is 0.9%. (The monthly output of coal tar has not changed) The average moisture content of coal tar decreased by 3.1%. The decrease of coal tar moisture content in the case of constant coal tar production means an increase in coal tar production. Direct economic benefit analysis: According to the market price of 2800 yuan per ton of coal tar, 2000 tons / month x 0.031 = 62 tons / month, the plant increased the average monthly coal tar output by 62 tons,

62 tons / month x2800 yuan / ton = 173,600 yuan / month; 173,600 yuan / month xl2 month = 2,083,200 yuan / year;

2083200 yuan / year - 98 million yuan / year = 11103200 yuan / year; It can be seen that the purification aid and purification method provided by the invention not only bring direct economic benefits to the enterprise, but also can not be solved by manual and other methods. The production problem guarantees the safe and smooth production of all production processes in the coking plant. The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A purification aid for coal chemical production, characterized by comprising 90 to 99 parts of oleyl polyoxyethylene ether and 1 to 5 parts of fatty amine by weight.

The purification aid according to claim 1, which comprises, in parts by weight, 94 to 99 parts of oleyl polyoxyethylene ether and 1 to 3 parts of fatty amine.

The purification aid according to claim 2, which comprises, in parts by weight, 99 parts of oleyl polyoxyethylene ether and 1 part of a fatty amine.

The purification assistant according to any one of claims 1 to 3, wherein the fatty amine is selected from one or more of a primary aliphatic amine, a secondary fatty amine, a tertiary fatty amine, and a fatty polyamine. Preferably, it is a primary fatty amine.

The purification aid according to claim 1, wherein the oleyl polyoxyethylene ether is oleyl ethoxylate 5EO~20EO.

6. Use of a purification aid for coal chemical production according to any one of claims 1 to 5 in coal chemical production.

7. Use according to claim 6, characterized in that the purification aid is added at the suction pump inlet of the recovery cycle system in the coal chemical production.

8. The use according to claim 7, characterized in that the purification aid is added to the recovery cycle system using a high pressure metering pump at the inlet of the circulating water pump.

9. The use according to claim 6, characterized in that the purification aid is added to the recycling system in the coal chemical production by means of successive incremental addition.

10. The application according to claim 9, wherein the incrementally increasing adding manner comprises:

51. Adding a purification aid that accounts for 1~3 ppm of circulating water in the recycling system to the recycling system for 10 to 15 days;

52. adding, to the recycling system, a purification aid that occupies 3 to 5 ppm of circulating water in the recycling system for 25 to 30 days; S3, adding a purification auxiliary agent that accounts for 5~10 ppm of circulating water in the recycling cycle system to the recycling cycle system, until the coal tar content in the circulating water volume in the recycling cycle system drops to 20% of the original amount~ 30%.