CN108998076B - Coal tar dehydrating agent and preparation method and application thereof - Google Patents
Coal tar dehydrating agent and preparation method and application thereof Download PDFInfo
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- CN108998076B CN108998076B CN201810817769.0A CN201810817769A CN108998076B CN 108998076 B CN108998076 B CN 108998076B CN 201810817769 A CN201810817769 A CN 201810817769A CN 108998076 B CN108998076 B CN 108998076B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G33/00—Dewatering or demulsification of hydrocarbon oils
- C10G33/04—Dewatering or demulsification of hydrocarbon oils with chemical means
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Abstract
The invention discloses a coal tar dehydrating agent and a preparation method and application thereof. The coal tar dehydrating agent is prepared from cationic polyacrylamide, guar gum and chitosan in a specific ratio, has the characteristics of high dehydration rate, low dehydrating agent consumption and low dehydration price, is pollution-free, green and healthy to the environment and is easy to store; the preparation method of the dehydrating agent is simple, easy to popularize, can be prepared at any time, and saves energy.
Description
Technical Field
The invention belongs to the technical field of coal tar, and particularly relates to a coal tar dehydrating agent, and a preparation method and application thereof.
Background
The coal tar is an oil product obtained in the high-temperature dry distillation and gasification processes of coal, is a mixture with complex components, contains a large amount of nonpolar substances, is insoluble in water, contains fine water drops and is tightly wrapped by the coal tar, and contains coal dust, coke powder and pyrolytic carbon with extremely fine particles, so that the coal tar is difficult to dewater. In the coking process, high-temperature raw gas is recycled by spraying circulating ammonia water and condensing and cooling a primary cooler, and in addition, the smokeless coal charging is carried out by adopting a high-pressure ammonia water injection method. Therefore, the tar contains a large amount of ammonia water, the moisture content of the tar has a plurality of adverse effects on the subsequent distillation operation, and the tar contains much moisture mainly in an intermittent tar distillation kettle, so that the dehydration time is prolonged, the production capacity of equipment is reduced, and the energy consumption is increased; in a tubular furnace continuous distillation system, if tar contains much water, the system pressure is obviously improved, the resistance is increased, and the operation system is disturbed to cause fire; corrosive substances brought along with the moisture can also cause corrosion of pipelines and equipment, the service life of the equipment is shortened, and the water content of the coal tar has obvious influence on the quality, the density and the viscosity of the product.
There are many methods for demulsifying and dewatering coal tar, which are mainly classified into physical methods, biological methods and chemical methods. Demulsifying and dewatering by a demulsifier belongs to a chemical method. Compared with crude oil demulsification and dehydration, the method has few reports on the demulsification and dehydration of the coal tar, and is insufficient in exploration on influencing factors and mechanisms of the demulsification and dehydration. The heating standing dehydration method has longer dehydration time and lower efficiency; the dehydration energy consumption of the tubular furnace heating method is higher.
The present invention has been made in view of the above circumstances.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a coal tar dehydrating agent, and a preparation method and application thereof. The coal tar dehydrating agent disclosed by the invention can rapidly separate the moisture of coal tar, and is high in speed, high in efficiency, small in using amount and low in energy consumption.
The first object of the invention provides a coal tar dehydrating agent which comprises cationic polyacrylamide, dimethylformamide, guar gum, chitosan and methanol.
The cationic polyacrylamide has positive electric property in acid or alkaline medium, and has lower molecular weight than anionic or non-ionic polyacrylamide, and its sewage clarifying performance is mainly obtained by charge neutralization, and the flocculant has the function of flocculating negatively charged matter and has the functions of eliminating turbidity and decolorizing.
Guar gum is a kind of natural water soluble polymer, and its main component is composed of straight chain D-mannose and D-galactose with every other D-mannose on side chain, the galactose-mannose structure has better water solubility and cross-linking property, and can form high viscosity stable water solution at low concentration.
Chitosan is also called chitosan and is obtained by deacetylation of chitin widely existing in the nature, and has a chemical name of polyglucosamine (1-4) -2-amino-B-D glucose.
The applicant finds that cationic polyacrylamide, guar gum and chitosan have a strong dehydration effect after being dissolved in dimethyl formamide and methanol through a large number of experiments, the dehydration rate is high, the dehydration effect is good, the use amount is small, and the water content of the coal tar is less than 1.5% after determination.
Further, the dehydrating agent comprises 2-4 parts by weight of cationic polyacrylamide, 7-9 parts by weight of dimethylformamide, 3-5 parts by weight of guar gum, 1.4-1.8 parts by weight of chitosan and 8-10 parts by weight of methanol.
Through a large number of experiments, the applicant finds that the raw materials for forming the dehydrating agent can destroy an oil-water interface membrane, break water-in-oil, promote oil-water separation, effectively shorten the water separation time, improve the production efficiency, save energy and reduce environmental pollution under the specific proportion.
Further, the dehydrating agent comprises 3 parts by weight of cationic polyacrylamide, 8 parts by weight of dimethylformamide, 4 parts by weight of guar gum, 1.6 parts by weight of chitosan and 9 parts by weight of methanol.
The second purpose of the invention is to provide a coal tar dehydrating agent, wherein the viscosity-average molecular weight of the cationic polyacrylamide is 900-1100 ten thousand.
Further, the dehydrating agent is treated by the coal tar prepared at the temperature of 900-1000 ℃.
The second purpose of the invention is to provide a preparation method of the coal tar dehydrating agent, which comprises the following steps:
(1) weighing the raw materials according to the weight of the raw materials for later use;
(2) dissolving the standby cationic polyacrylamide in dimethylformamide, and uniformly stirring to obtain a solution A;
(3) dissolving guar gum and chitosan in methanol, and uniformly stirring to obtain a solution B;
(4) and mixing, heating and stirring the solution A and the solution B to obtain the coal tar dehydrating agent.
Further, the stirring speed in the step (2) is 100-120rpm, and the stirring time is 20-30 min.
Further, the stirring speed in the step (3) is 140-150rpm, and the stirring time is 25-35 min.
Further, the heating temperature in the step (4) is 40-50 ℃.
The third purpose of the invention is to provide the application of the coal tar dehydrating agent in coal tar dehydration, wherein the coal tar is heated to 60-70 ℃, the coal tar dehydrating agent is added, and the coal tar dehydrating agent is uniformly mixed, wherein the adding amount of the dehydrating agent in each ton of coal tar is 1.0-1.2 kg.
The coal tar is influenced by heating temperature during dehydration, and because the temperature is increased, the thermal motion of a system is enhanced, the diffusion, the displacement and the mutual collision of emulsion drops of a dehydrating agent are facilitated, the dehydration time of the coal tar is reduced, the dehydration rate is increased, and the high temperature can cause energy waste and equipment damage.
Compared with the prior art, the invention has the following beneficial effects:
(1) the coal tar dehydrating agent is prepared from cationic polyacrylamide, guar gum and chitosan in a specific ratio, has the characteristics of high dehydration rate, low dehydrating agent consumption and low dehydration price, is pollution-free, green and healthy to the environment and is easy to store;
(2) the preparation method of the dehydrating agent is simple, easy to popularize, can be prepared at any time, and saves energy.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The coal tar in the embodiment of the invention is prepared by adopting coal tar produced by Shaanxi extended petrochemical group clean raw coal chemical plants at the temperature of 900-1000 ℃, and the water content is 22%.
Example 1
The coal tar dehydrating agent of the embodiment comprises 2kg of cationic polyacrylamide, 7kg of dimethylformamide, 3kg of guar gum, 1.4kg of chitosan and 8kg of methanol; the viscosity average molecular weight of the cationic polyacrylamide is 900-1100 ten thousand.
The preparation method of the coal tar dehydrating agent comprises the following steps:
(1) weighing the raw materials according to the weight of the raw materials for later use;
(2) dissolving the standby cationic polyacrylamide in dimethylformamide, and uniformly stirring at the stirring speed of 100rpm for 20min to obtain a solution A;
(3) dissolving guar gum and chitosan in methanol, and uniformly stirring at the stirring speed of 140rpm for 25min to obtain a solution B;
(4) and mixing the solution A and the solution B, heating to 40 ℃, and stirring to obtain the coal tar dehydrating agent.
Example 2
The coal tar dehydrating agent of the embodiment comprises 3kg of cationic polyacrylamide, 8kg of dimethylformamide, 4kg of guar gum, 1.6kg of chitosan and 9kg of methanol; the viscosity average molecular weight of the cationic polyacrylamide is 900-1100 ten thousand.
The preparation method of the coal tar dehydrating agent comprises the following steps:
(1) weighing the raw materials according to the weight of the raw materials for later use;
(2) dissolving the standby cationic polyacrylamide in dimethylformamide, and uniformly stirring at the stirring speed of 110rpm for 25min to obtain a solution A;
(3) dissolving guar gum and chitosan in methanol, and uniformly stirring at the stirring speed of 145rpm for 30min to obtain a solution B;
(4) and mixing the solution A and the solution B, heating to 45 ℃, and stirring to obtain the coal tar dehydrating agent.
Example 3
The coal tar dehydrating agent of the embodiment comprises 4kg of cationic polyacrylamide, 9kg of dimethylformamide, 5kg of guar gum, 1.8kg of chitosan and 10kg of methanol; the viscosity average molecular weight of the cationic polyacrylamide is 900-1100 ten thousand.
The preparation method of the coal tar dehydrating agent comprises the following steps:
(1) weighing the raw materials according to the weight of the raw materials for later use;
(2) dissolving the standby cationic polyacrylamide in dimethylformamide, and uniformly stirring at the stirring speed of 120rpm for 30min to obtain a solution A;
(3) dissolving guar gum and chitosan in methanol, and uniformly stirring at the stirring speed of 145rpm for 35min to obtain a solution B;
(4) and mixing the solution A and the solution B, heating to 45 ℃, and stirring to obtain the coal tar dehydrating agent.
Example 4
The coal tar dehydrating agent is applied to coal tar dehydration, the coal tar is heated to 60 ℃, the coal tar dehydrating agent prepared in the embodiment 1 is added, the mixture is uniform, the adding amount of the dehydrating agent in each ton of the coal tar is 1.0kg, the coal tar is kept still for 8 hours, the coal tar prepared at the temperature of 900 plus one hour and 1000 ℃ is treated by the dehydrating agent, and the water content is 1.3 percent after the treatment by adopting a volumetric method of a Karl Fischer 852 moisture determinator.
Example 5
The coal tar dehydrating agent is applied to coal tar dehydration, the coal tar is heated to 65 ℃, the coal tar dehydrating agent prepared in the embodiment 2 is added, the mixture is uniform, the adding amount of the dehydrating agent in each ton of the coal tar is 1.1kg, the coal tar is kept stand for 8 hours, the coal tar prepared at the temperature of 900-1000 ℃ is treated by the dehydrating agent, and the water content is 1.2 percent after the treatment by adopting a volumetric method of a Karl Fischer 852 moisture tester.
Example 6
The coal tar dehydrating agent is applied to coal tar dehydration, the coal tar is heated to 70 ℃, the coal tar dehydrating agent prepared in the embodiment 3 is added, the mixture is uniform, the adding amount of the dehydrating agent in each ton of the coal tar is 1.2kg, the coal tar is kept stand for 8 hours, the coal tar prepared at the temperature of 900-1000 ℃ is treated by the dehydrating agent, and the water content is 1.4 percent after the treatment by adopting a volumetric method of a Karl Fischer 852 moisture tester.
Test example 1
The dehydration rates of the coal tar treated in examples 4 to 6 were measured respectively in Table 1 by measuring the water content in the coal tar after standing for 2 hours, 4 hours, 6 hours and 8 hours, respectively.
TABLE 1
From the table, the dehydrating agent prepared by the invention has a high dehydrating speed, and the water content in the coal tar is less than 4% after standing for 6 hours.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. The coal tar dehydrating agent is characterized by comprising 2-4 parts by weight of cationic polyacrylamide, 7-9 parts by weight of dimethylformamide, 3-5 parts by weight of guar gum, 1.4-1.8 parts by weight of chitosan and 8-10 parts by weight of methanol.
2. The coal tar dehydrating agent as claimed in claim 1, wherein the dehydrating agent comprises 3 parts by weight of cationic polyacrylamide, 8 parts by weight of dimethylformamide, 4 parts by weight of guar gum, 1.6 parts by weight of chitosan and 9 parts by weight of methanol.
3. The coal tar dehydrating agent as set forth in claim 1 or 2, wherein the cationic polyacrylamide has a viscosity average molecular weight of 900-1100 ten thousand.
4. The coal tar dehydrating agent as set forth in claim 3, characterized in that the dehydrating agent is treated with coal tar prepared at a temperature of 900-1000 ℃.
5. A method for preparing a coal tar dewatering agent according to any one of claims 1 to 4, characterized in that the method comprises the steps of:
(1) weighing the raw materials according to the weight of the raw materials for later use;
(2) dissolving the standby cationic polyacrylamide in dimethylformamide, and uniformly stirring to obtain a solution A;
(3) dissolving guar gum and chitosan in methanol, and uniformly stirring to obtain a solution B;
(4) and mixing, heating and stirring the solution A and the solution B to obtain the coal tar dehydrating agent.
6. The method for preparing a coal tar dehydrating agent as claimed in claim 5, wherein the stirring speed in step (2) is 100-120rpm, and the stirring time is 20-30 min.
7. The method for preparing a coal tar dehydrating agent as claimed in claim 5, wherein the stirring rate in the step (3) is 140-150rpm, and the stirring time is 25-35 min.
8. The method for producing a coal tar dehydrating agent according to claim 5, wherein the heating temperature in the step (4) is 40 to 50 ℃.
9. The application of the coal tar dehydrating agent in coal tar dehydration according to any one of claims 1 to 4, characterized in that coal tar is heated to 60 to 70 ℃, the coal tar dehydrating agent is added, and the mixture is uniformly mixed, wherein the adding amount of the dehydrating agent in each ton of coal tar is 1.0 to 1.2 kg.
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| CN201810817769.0A CN108998076B (en) | 2018-07-24 | 2018-07-24 | Coal tar dehydrating agent and preparation method and application thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100360437C (en) * | 1998-05-28 | 2008-01-09 | 纳幕尔杜邦公司 | Method for treatment of aqueous streams comprising biosolids |
| CN101550354A (en) * | 2009-05-07 | 2009-10-07 | 中国石油天然气股份有限公司 | Cationic crude oil pre-dehydrating agent and preparation method thereof |
| CN103764572A (en) * | 2011-06-23 | 2014-04-30 | 加维什-加利利生物应用有限公司 | Method for pretreatment of wastewater and recreational water with nanocomposites |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10273169B2 (en) * | 2012-06-21 | 2019-04-30 | Gavish-Galilee Bio Applications, Ltd. | Method for pretreatment of wastewater with nanocomposites and bridging polymers |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100360437C (en) * | 1998-05-28 | 2008-01-09 | 纳幕尔杜邦公司 | Method for treatment of aqueous streams comprising biosolids |
| CN101550354A (en) * | 2009-05-07 | 2009-10-07 | 中国石油天然气股份有限公司 | Cationic crude oil pre-dehydrating agent and preparation method thereof |
| CN103764572A (en) * | 2011-06-23 | 2014-04-30 | 加维什-加利利生物应用有限公司 | Method for pretreatment of wastewater and recreational water with nanocomposites |
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Effective date of registration: 20201203 Address after: 710200 No.18 small and medium sized enterprise entrepreneurship demonstration park, Ronghao industrial city, Gaoling District, Xi'an City, Shaanxi Province Patentee after: Xi'an dingbowei Environmental Protection Technology Co., Ltd Address before: 710000 8th Floor of Yunlong Building, No. 46 Duanlumen, Beilin District, Xi'an City, Shaanxi Province Patentee before: XI'AN LIGHT INDUSTRY INSTITUTE |
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