CN108998077B - Coal tar dehydrating agent and preparation method thereof - Google Patents
Coal tar dehydrating agent and preparation method thereof Download PDFInfo
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- CN108998077B CN108998077B CN201810945102.9A CN201810945102A CN108998077B CN 108998077 B CN108998077 B CN 108998077B CN 201810945102 A CN201810945102 A CN 201810945102A CN 108998077 B CN108998077 B CN 108998077B
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- polyoxyethylene polyoxypropylene
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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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- 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
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/20—Characteristics of the feedstock or the products
- C10G2300/201—Impurities
Abstract
The invention discloses a coal tar dehydrating agent and a preparation method thereof, wherein the coal tar dehydrating agent comprises the following components in parts by weight: 3-8 parts of polyoxyethylene polyoxypropylene octadecanol ether, 20-30 parts of alkylphenol formaldehyde resin polyoxyethylene polyoxypropylene ether, 20-103-5 parts of emulsifier OP-103, 803-5 parts of span, 803-5 parts of tween, 803-5 parts of solvent and 40-50 parts of solvent. The invention has the beneficial effects that: the coal tar dehydrating agent has a good dehydrating effect on low-temperature coal tar.
Description
Technical Field
The invention relates to a coal tar auxiliary agent, in particular to a coal tar dehydrating agent and a preparation method thereof.
Background
Coal tar is a black or blackish brown viscous liquid with pungent odor generated during coal dry distillation. Coal tar is extremely complex in composition and requires distillation to extract a variety of separation products. Before the coal tar is distilled, the coal tar needs to be dehydrated, so that the heat consumption in the distillation process is reduced. At present, people often adopt a coal tar dehydrating agent to dehydrate coal tar.
Chinese patent with publication number CN103361109A discloses a coal tar dehydrating agent and application thereof. The coal tar dehydrating agent consists of 0.08-0.1 part by mass of a component A and 1.5-5 parts by mass of a component B, wherein the component A consists of 30 wt% of polyether, 50 wt% of methanol and 20 wt% of tap water. The component B is a sodium acetate aqueous solution with the mass fraction of 40%. The polyether has an average molecular weight of 4000-8000, and is a compound of phenol amine aldehyde resin polyoxypropylene polyoxyethylene ether and polyol polyether.
Coal is pyrolyzed for the first time to produce low-temperature coal tar, and the low-temperature coal tar is pyrolyzed for the second time at high temperature to obtain medium-temperature coal tar and high-temperature coal tar. Due to the differences in pyrolysis raw materials and pyrolysis conditions, low temperature coal tar and high temperature coal tar are very different in chemical composition and thus in properties. The coal tar dehydrating agent is suitable for high-temperature coal tar, while the density of low-temperature coal tar is closer to that of water, so that emulsion is easily formed with water, the content of phenol is higher, the hydrogen bond energy between phenol and water molecules is stronger, and the oil-water separation is very difficult. Therefore, due to the difference in properties between high-temperature coal tar and low-temperature coal tar, the coal tar dehydrating agent has a poor dehydrating effect on low-temperature tar and needs to be improved.
Disclosure of Invention
The invention aims to provide a coal tar dehydrating agent. The coal tar dehydrating agent has a good dehydrating effect on low-temperature coal tar.
The technical purpose of the invention is realized by the following technical scheme:
a coal tar dehydrating agent comprises the following components in parts by weight:
3-8 parts of polyoxyethylene polyoxypropylene octadecanol ether
20-30 parts of alkylphenol formaldehyde resin polyoxyethylene polyoxypropylene ether
Emulsifier OP-103-5 parts
Span 803-5 parts
Tween 803-5 parts
40-50 parts of a solvent.
The invention is further configured to: the coal tar dehydrating agent also comprises 1-3 parts of quaternary ammonium salt according to parts by weight.
The invention is further configured to: the quaternary ammonium salt is diethylbenzyl-3- (trimethoxy silicon) propyl ammonium chloride.
The invention is further configured to: the preparation method of the diethylbenzyl-3- (trimethoxy silicon) propyl ammonium chloride comprises the following steps:
step 1: uniformly mixing diethylamine and gamma-chloropropyltrimethoxysilane according to the mass ratio of 5-7:1 of diethylamine and gamma-chloropropyltrimethoxysilane, and reacting at 55-65 ℃ for 70-75h to obtain N, N-diethylaminopropyl trimethoxysilane;
step 2: dissolving N, N-diethylaminopropyl trimethoxy silane in absolute ethanol, adding benzyl chloride according to the mass ratio of the gamma-chloropropyl trimethoxy silane to the benzyl chloride of 1:0.8-1.2, and reacting at 75-80 ℃ for 20-25h to obtain diethylbenzyl-3- (trimethoxy silicon) propyl ammonium chloride.
The invention is further configured to: the coal tar dehydrating agent also comprises 0.1-0.5 part of sodium hydroxide according to the parts by weight.
The invention is further configured to: the solvent is methanol.
The invention is further configured to: the molecular weight of the polyoxyethylene polyoxypropylene octadecanol ether and the alkylphenol resin polyoxyethylene polypropylene ether is 6000-7000.
The invention also aims to provide a preparation method of the coal tar dehydrating agent, which comprises the following steps:
step 1: weighing 3-8 parts of polyoxyethylene polyoxypropylene octadecanol ether, 20-30 parts of alkylphenol formaldehyde resin polyoxyethylene polyoxypropylene ether, 103-5 parts of emulsifier OP-103, 803-5 parts of span, 803-5 parts of tween, 1-3 parts of quaternary ammonium salt, 0.1-0.5 part of sodium hydroxide and 40-50 parts of methanol according to parts by weight;
step 2: adding polyoxyethylene polyoxypropylene octadecanol ether, alkylphenol formaldehyde polyoxyethylene polyoxypropylene ether, emulsifier OP-10, span 80, Tween 80, quaternary ammonium salt and sodium hydroxide into methanol, and stirring to dissolve completely.
In conclusion, the invention has the following beneficial effects:
1. the polyoxyethylene polyoxypropylene octadecanol ether belongs to SP type demulsifier, the hydrophobic part of which consists of C18 hydrocarbon chain, and the hydrophilic group of which achieves the hydrophilic purpose by forming hydrogen bond through the action of hydroxyl, ether group and water in the molecule. Because the hydroxyl groups and the ether groups have weak hydrophilicity, the hydrophobic group of the C18 hydrocarbon chain cannot be pulled into water only by one or two hydroxyl groups or ether groups, and a plurality of hydrophilic groups are needed to achieve the purpose of water solubility, so that the coal tar oil is suitable for coal tar which does not contain or contains very little colloid and asphaltene, has less lipophilic surfactant substances and has lower relative density. The alkyl phenolic resin polyoxyethylene polyoxypropylene ether belongs to an AR type demulsifier, has small molecules, has better dissolution, diffusion and less penetration at low temperature, promotes the flocculation and coalescence of emulsified water drops, and has high dehydration efficiency;
2. the emulsifier OP-10, span 80 and Tween 80 are nonionic emulsifiers. The emulsifiers OP-10, span 80 and Tween 80 can reduce the viscosity of the low-temperature coal tar, so that oil-water separation can be promoted. Meanwhile, the emulsifiers OP-10, span 80 and Tween 80 have higher surface activity than colloid and asphaltene, and a new interfacial film formed after the colloid and the asphaltene are replaced is weaker than the original interfacial film and is easier to break under the action of gravity, so that oil-water separation is promoted. The demulsification effect can be improved by the complex use of the emulsifier OP-10, the span 80 and the Tween 80;
3. the quaternary ammonium salt is one of the cationic demulsifiers, has a good demulsification effect, but generally has poor heat resistance, and partial quaternary ammonium salt can be decomposed at about 60 ℃. The diethylbenzyl-3- (trimethoxy silicon) propyl ammonium chloride is one of quaternary ammonium salts, has the property of the quaternary ammonium salt, and meanwhile, the heat resistance of the quaternary ammonium salt is remarkably improved by introducing the organic silicon group, so that the quaternary ammonium salt can stably exist in an environment of about 120 ℃;
4. the sodium hydroxide can react with phenol to form sodium phenolate and is dissolved in water, so that hydrogen bonds among phenol water molecules are reduced, and the difficulty of oil-water separation is reduced. Meanwhile, the sodium hydroxide and the quaternary ammonium salt can generate quaternary ammonium base, so that the demulsification effect of the quaternary ammonium salt is enhanced;
5. the methanol has good solubility for polyoxyethylene polyoxypropylene octadecanol ether, alkylphenol formaldehyde resin polyoxyethylene polyoxypropylene ether, emulsifier OP-10, span 80 and tween 80, and also has good solubility for quaternary ammonium salt and sodium hydroxide.
Detailed Description
Examples 1-5 are presented to illustrate the preparation of diethylbenzyl-3- (trimethoxy silicon) propyl ammonium chloride. Example 1-5 Diethylphenylmethyl-3- (trimethoxy silicon) propylammonium chloride the process parameters are shown in Table 1.
TABLE 1 parameter Table of preparation method of example 1-5 Diethylphenylmethyl-3- (trimethoxy silicon) propyl ammonium chloride
Referring to Table 1, the preparation of diethylbenzyl-3- (trimethoxy silicon) propyl ammonium chloride is described in detail below.
A preparation method of diethylbenzyl-3- (trimethoxy silicon) propyl ammonium chloride comprises the following steps:
step 1: adding gamma-chloropropyltrimethoxysilane into a reaction kettle, heating to 40 ℃, adding diethylamine, continuously heating to 50 ℃, adding sodium hydroxide serving as a catalyst according to the mass ratio of the gamma-chloropropyltrimethoxysilane to the sodium hydroxide of 1: 0.1, continuously heating to the reaction temperature for reaction to obtain N, N-diethylaminopropyltrimethoxysilane;
step 2: putting N, N-diethylaminopropyl trimethoxy silane into a reaction kettle, adding absolute ethanol for dissolving, stirring and heating to reaction temperature, slowly adding benzyl chloride, performing reflux reaction, and evaporating ethanol under reduced pressure after the reaction is finished to obtain diethylbenzyl-3- (trimethoxy silicon) propyl ammonium chloride.
Examples 6-10 are presented to illustrate the components of a coal tar dewatering agent. The components of the coal tar dehydrating agents of examples 6 to 10 are shown in Table 2.
TABLE 2, EXAMPLES 6-10 composition tables of dehydrating agents for coal tar
Note: the unit "parts" means parts by weight.
Referring to table 2, the method for preparing the coal tar dehydrating agent is described in detail below.
A preparation method of a coal tar dehydrating agent comprises the following steps:
step 1: weighing polyoxyethylene polyoxypropylene octadecanol ether, alkylphenol formaldehyde resin polyoxyethylene polyoxypropylene ether, emulsifier OP-10, span 80, tween 80, diethylbenzyl-3- (trimethoxy silicon) propyl ammonium chloride, sodium hydroxide and methanol according to the parts by weight;
step 2: adding polyoxyethylene polyoxypropylene octadecanol ether, alkylphenol formaldehyde polyoxyethylene polyoxypropylene ether, emulsifier OP-10, span 80, tween 80, diethylbenzyl-3- (trimethoxy silicon) propyl ammonium chloride and sodium hydroxide into methanol, and stirring to dissolve completely.
Comparative example 1
Example 3 of the chinese patent publication No. CN103361109A was selected as comparative example 1.
Water content test
Taking low-temperature coal tar (600-3The coal tar dehydrating agents of examples 6 to 10 and comparative example 1 were used for dehydration, and the specific dehydration procedure was as follows:
step 1: equally dividing low-temperature coal tar into 6 parts, heating the 6 parts of low-temperature coal tar to 60 ℃, respectively adding the coal tar dehydrating agents of examples 6-10 and comparative example 1, uniformly mixing, wherein the adding amount of the coal tar dehydrating agent is 0.5kg per ton of low-temperature coal tar, standing at constant temperature for 4h, and detecting the water content of the 6 parts of low-temperature coal tar by adopting a volumetric method of a Karl Fischer 852 moisture tester;
step 2: and (3) repeating the step 1 for 4 times, and taking an average value of the water content of the low-temperature coal tar obtained for 5 times as the determination water content.
Table 3, tables for testing water content of examples 6 to 10 and comparative example 1
| Example 6 | Example 7 | Example 8 | Example 9 | Example 10 | Comparative example 1 | |
| Determination of the Water content% | 1.39 | 1.27 | 1.29 | 1.35 | 1.37 | 1.87 |
As can be seen from Table 3, examples 6 to 10 had lower measured water contents than comparative example 1. Therefore, the method has good dehydration effect on low-temperature coal tar.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications without inventive contribution to the present embodiment as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (5)
1. A coal tar dehydrating agent is characterized in that: the composition comprises the following components in parts by weight:
3-8 parts of polyoxyethylene polyoxypropylene octadecanol ether
20-30 parts of alkylphenol formaldehyde resin polyoxyethylene polyoxypropylene ether
Emulsifier OP-103-5 parts
Span 803-5 parts
Tween 803-5 parts
40-50 parts of solvent
The coal tar dehydrating agent also comprises 1-3 parts of quaternary ammonium salt by weight, wherein the quaternary ammonium salt is diethylbenzyl-3- (trimethoxy silicon) propyl ammonium chloride;
the coal tar dehydrating agent also comprises 0.1-0.5 part of sodium hydroxide according to the parts by weight.
2. The coal tar dewatering agent according to claim 1, characterized by: the preparation method of the diethylbenzyl-3- (trimethoxy silicon) propyl ammonium chloride comprises the following steps:
step 1: uniformly mixing diethylamine and gamma-chloropropyltrimethoxysilane according to the mass ratio of 5-7:1, and reacting at 55-65 ℃ for 70-75h to obtain N, N-diethylaminopropyl trimethoxysilane;
step 2: dissolving N, N-diethylaminopropyl trimethoxy silane in absolute ethyl alcohol, adding benzyl chloride according to the mass ratio of gamma-chloropropyl trimethoxy silane to benzyl chloride of 1:0.8-1.2, and reacting at 75-80 ℃ for 20-25h to obtain diethylbenzyl-3- (trimethoxy silicon) propyl ammonium chloride.
3. The coal tar dewatering agent according to claim 1, characterized by: the solvent is methanol.
4. The coal tar dewatering agent according to claim 1, characterized by: the molecular weight of the polyoxyethylene polyoxypropylene octadecanol ether and the alkylphenol resin polyoxyethylene polyoxypropylene ether is 6000-7000.
5. A preparation method of a coal tar dehydrating agent is characterized by comprising the following steps: the method comprises the following steps:
step 1: weighing 3-8 parts of polyoxyethylene polyoxypropylene octadecanol ether, 20-30 parts of alkylphenol formaldehyde resin polyoxyethylene polyoxypropylene ether, 103-5 parts of emulsifier OP-103, 803-5 parts of span, 803-5 parts of tween, 1-3 parts of quaternary ammonium salt, 0.1-0.5 part of sodium hydroxide and 40-50 parts of methanol according to parts by weight;
step 2: adding polyoxyethylene polyoxypropylene octadecanol ether, alkylphenol formaldehyde polyoxyethylene polyoxypropylene ether, emulsifier OP-10, span 80, Tween 80, quaternary ammonium salt and sodium hydroxide into methanol, and fully stirring to completely dissolve the polyoxyethylene polyoxypropylene octadecanol ether and the alkylphenol formaldehyde polyoxyethylene polyoxypropylene ether;
the quaternary ammonium salt is diethylbenzyl-3- (trimethoxy silicon) propyl ammonium chloride.
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Effective date of registration: 20210129 Address after: 030000 No.22, 23, block a, 103 Changzhi Road, Taiyuan City, Shanxi Province Patentee after: SHANXI YAXIN ENERGY GROUP Co.,Ltd. Address before: 315000 15-1, building 033, No. 8, Xinghai South Road, hi tech Zone, Ningbo City, Zhejiang Province Patentee before: NINGBO JINGYE HOLDING GROUP Co.,Ltd. |