CN111269093A - Preparation method of secondary alcohol polyoxyethylene ether - Google Patents
Preparation method of secondary alcohol polyoxyethylene ether Download PDFInfo
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- CN111269093A CN111269093A CN201811476326.6A CN201811476326A CN111269093A CN 111269093 A CN111269093 A CN 111269093A CN 201811476326 A CN201811476326 A CN 201811476326A CN 111269093 A CN111269093 A CN 111269093A
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
- C07C41/01—Preparation of ethers
- C07C41/02—Preparation of ethers from oxiranes
- C07C41/03—Preparation of ethers from oxiranes by reaction of oxirane rings with hydroxy groups
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
- C07C41/01—Preparation of ethers
- C07C41/34—Separation; Purification; Stabilisation; Use of additives
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Abstract
The invention relates to a preparation method of secondary alcohol polyoxyethylene ether, which mainly solves the problem that the chroma of the secondary alcohol polyoxyethylene ether obtained by the reaction of a secondary alcohol and ethylene oxide is high under the condition of an alkaline catalyst in the prior art, and the preparation method of the secondary alcohol polyoxyethylene ether comprises the step of reacting the secondary alcohol and the ethylene oxide to obtain the secondary alcohol polyoxyethylene ether in the presence of the alkaline catalyst and a decolorizing agent, wherein the decolorizing agent comprises at least one of the following components (a), (b) and (c): (a) an alkali metal hypophosphite; (b) ethylenediaminetetraacetic acid and/or alkali metal salts thereof; (c) the technical scheme of the aromatic ether better solves the technical problem and can be used for industrial production of secondary alcohol polyoxyethylene ether.
Description
Technical Field
The invention relates to a preparation method of secondary alcohol polyoxyethylene ether.
Background
The secondary alcohol polyoxyethylene ether is a product obtained by initiating ethylene oxide polymerization by using a secondary alcohol as an initiator and an alkaline catalyst, and the product has high chroma which not only reflects the color shade of the product, but also directly reflects the inherent quality of the secondary alcohol polyoxyethylene ether. In some applications, the chroma has adverse effect on the use of the secondary alcohol polyoxyethylene ether, and the use performance of the product is finally affected, so that a method for reducing the chroma in the secondary alcohol polyoxyethylene ether is expected.
Disclosure of Invention
The invention aims to solve the problem that secondary alcohol polyoxyethylene ether obtained by the reaction of a secondary alcohol and ethylene oxide has high chroma under the condition of an alkaline catalyst in the prior art, and provides a preparation method of the secondary alcohol polyoxyethylene ether.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the preparation method of the secondary alcohol polyoxyethylene ether comprises the step of reacting a secondary alcohol with ethylene oxide in the presence of an alkaline catalyst and a decoloring agent to obtain the secondary alcohol polyoxyethylene ether, wherein the decoloring agent comprises at least one of the following components (a), (b) and (c):
(a) an alkali metal hypophosphite;
(b) ethylenediaminetetraacetic acid and/or alkali metal salts thereof;
(c) an aromatic ether.
The use of the decoloring agent can effectively reduce the chroma of the secondary alcohol polyoxyethylene ether.
In the above technical solution, the aromatic ether is preferably diphenyl ether
In the above technical solution, it is more preferable that the decoloring agent includes at least two of the component (a), the component (b), and the component (c). The two components have an interaction promoting effect on reducing the chroma of the secondary alcohol polyoxyethylene ether. For example, but not limited to, the color destroying agent comprises component (a) and component (b), or the color destroying agent comprises component (a) and component (c), or the color destroying agent comprises component (b) and component (c).
When the decolorizing agent comprises at least two of component (a), component (b) and component (c), the weight ratio between the two is not particularly limited and all achieve comparable mutual promoting technical effects.
By way of non-limiting example, when the decolorizing agent includes component (a), component (b), the weight ratio of component (a) to component (b) can be selected from 0.1 to 10, more specific non-limiting weight ratios such as 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, and the like.
By way of non-limiting example, when the decolorizing agent includes component (b), component (c), the weight ratio of component (b) to component (c) can be selected from 0.1 to 10, more specific non-limiting weight ratios such as 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, and the like.
By way of non-limiting example, when the decolorizing agent includes component (a), component (c), the weight ratio of component (a) to component (c) can be selected from 0.1 to 10, more specific non-limiting weight ratios such as 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, and the like.
In the above technical solution, it is more preferable that the decoloring agent includes a component (a), a component (b), and a component (c), and in this case, the three components have a combined effect in reducing the chromaticity of the secondary alcohol polyoxyethylene ether.
For the technical scheme that the decoloring agent simultaneously comprises the component (a), the component (b) and the component (c), the proportion of the three components is not particularly limited and all can achieve a comparable combined effect.
By way of non-limiting example, when the decolorizing agent includes component (a), component (b), and component (c), component (a): component (b): component (c) can be selected to be 1: x: y, and x and y can be selected independently from 0.1 to 10 by weight, where x and y can be selected independently from a range of values, as further non-limiting examples of points, x and y can be selected independently from 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.5, 9.0, etc.
In the technical scheme, the alkali metal hypophosphite can be potassium hypophosphite and/or sodium hypophosphite; the alkali metal hypophosphite can be anhydrous salt or can contain crystal water, and can achieve comparable technical effects. In the embodiment of the invention, sodium hypophosphite is adopted, and the molecules contain 1 crystal water, namely the molecular formula is NaH2PO2·H2O。
In the above technical scheme, although the component (b) may be ethylenediamine tetraacetic acid, an additional base other than the catalyst amount is required in the reaction to neutralize the ethylenediamine tetraacetic acid into a salt. The alkali metal salt of ethylenediaminetetraacetic acid of component (b) may be a dialkali metal salt of ethylenediaminetetraacetic acid, and/or a tetraalkali metal salt of ethylenediaminetetraacetic acid, with di-salts also requiring the consumption of additional base compared to tetra-salts. The salt may be an anhydrous salt or may contain crystal water. The alkali metal salt of ethylenediaminetetraacetic acid may be a sodium and/or potassium salt of ethylenediaminetetraacetic acid. All of them can achieve comparable technical effects. For comparison, in the embodiment of the present invention, the component (b) is anhydrous ethylenediaminetetraacetic acid tetrasodium salt, which is represented as EDTA-4 Na.
In the technical scheme, the dosage of the decoloring agent is preferably 0.05-1% of the weight of secondary alcohol polyoxyethylene ether. Such as, but not limited to, 0.06%, 0.07%, 0.08%, 0.09%, 0.10%, 0.15%, 0.20%, 0.25%, 0.30%, 0.35%, 0.40%, 0.45%, 0.50%, 0.55%, 0.60%, 0.65%, 0.70%, 0.75%, 0.80%, 0.85%, 0.90%, 0.95%, and the like.
In the technical scheme, the secondary alcohol can be C8-C18 secondary alcohol. Such as, but not limited to, C9 secondary alcohol, C10 secondary alcohol, C11 secondary alcohol, C12 secondary alcohol, C13 secondary alcohol, C14 secondary alcohol, C15 secondary alcohol, C16 secondary alcohol, C17 secondary alcohol, and the like.
In the above technical scheme, the addition number of ethylene oxide in the secondary alcohol polyoxyethylene ether is preferably 7-10, for example, but not limited to 7.5, 8, 8.5, 9, 9.5, and the like.
In the technical scheme, the molar ratio of the ethylene oxide to the secondary alcohol is preferably 7-10, such as but not limited to 7.5, 8, 8.5, 9, 9.5, and the like.
In the above technical scheme, the reaction temperature can be selected from 115 to 180 ℃, such as, but not limited to, 120 ℃, 125 ℃, 130 ℃, 135 ℃, 140 ℃, 145 ℃, 160 ℃, 165 ℃, 170 ℃, 175 ℃ and the like.
In the above technical solution, the basic catalyst is preferably an alkali metal hydroxide and/or an alkali metal alkoxide of a C1 to C2 alcohol.
In the above technical solution, the alkali metal may be K and/or Na.
In the technical scheme, the C1-C2 alcohol can be selected from methanol and/or ethanol.
In the technical scheme, the dosage of the alkaline catalyst is preferably 0.05-1% of the weight of the secondary alcohol polyoxyethylene ether. Such as, but not limited to, 0.06%, 0.07%, 0.08%, 0.09%, 0.10%, 0.15%, 0.20%, 0.25%, 0.30%, 0.35%, 0.40%, 0.45%, 0.50%, 0.55%, 0.60%, 0.65%, 0.70%, 0.75%, 0.80%, 0.85%, 0.90%, 0.95%, and the like.
In the technical scheme, the reaction pressure is preferably 0.05-0.5 MPa. Such as, but not limited to, 0.10MPa, 0.15MPa, 0.20MPa, 0.25MPa, 0.30MPa, 0.35MPa, 0.40MPa, 0.45MPa, and the like.
Unless otherwise specified, the pressures described herein are in terms of gauge pressure.
The chroma analysis method in the specific embodiment of the invention comprises the following steps: GB/T9282.1-2008 transparent liquids rate color on a platinum-cobalt scale.
The inventors have experimentally found that the chroma of the secondary alcohol polyoxyethylene ether can be greatly reduced using the process described herein.
The present invention will be further described with reference to the following examples.
Detailed Description
[ COMPARATIVE EXAMPLE ]
Adding 100g of sec-tridecanol and 1g of potassium hydroxide into a 1-pressure-rising reaction kettle with stirring, sealing the high-pressure reaction kettle, starting stirring, replacing with nitrogen for three times, evacuating and dehydrating at the temperature of 100 ℃ and the pressure of-0.096 MPa for 30 minutes, then introducing ethylene oxide into the reaction kettle, controlling the reaction temperature of 155 ℃ and the reaction pressure of 0.20MPa until the total amount of the introduced ethylene oxide is 198g, stopping introducing the ethylene oxide, then maintaining the reaction temperature until the pressure of the reaction kettle does not drop any more, indicating that the curing reaction is finished, cooling to the temperature of 75 ℃, adding 1g of acetic acid for neutralization, and obtaining the secondary alcohol polyoxyethylene (9) ether. And measuring the chromaticity index.
For comparison, the composition of the decolorizer and the results of the color measurements are shown in Table 1.
[ example 1 ]
Adding 100g of sec-tridecanol, 1g of potassium hydroxide and 1g of sodium hypophosphite into a stirred 1-pressure-rising reaction kettle, sealing the high-pressure reaction kettle, starting stirring, replacing with nitrogen for three times, evacuating and dehydrating at the temperature of 100 ℃ and the pressure of-0.096 MPa for 30 minutes, then introducing ethylene oxide into the reactor kettle, controlling the reaction temperature of 155 ℃ and the reaction pressure of 0.20MPa until the total amount of the introduced ethylene oxide is 198g, stopping introducing the ethylene oxide, then maintaining the reaction temperature until the pressure of the reaction kettle does not drop any more, indicating that the curing reaction is finished, cooling to 75 ℃, adding 1g of acetic acid for neutralization, and obtaining the secondary alcohol polyoxyethylene (9) ether. And measuring the chromaticity index.
For comparison, the composition of the decolorizer and the results of the color measurements are shown in Table 1.
[ example 2 ]
Adding 100g of sec-tridecanol, 1g of potassium hydroxide and 1g of diphenyl ether into a stirred 1-pressure-rising reaction kettle, sealing the high-pressure reaction kettle, starting stirring, replacing with nitrogen for three times, evacuating and dehydrating at the temperature of 100 ℃ and the pressure of-0.096 MPa for 30 minutes, then introducing ethylene oxide into the reaction kettle, controlling the reaction temperature of 155 ℃ and the reaction pressure of 0.20MPa until the total amount of the introduced ethylene oxide is 198g, stopping introducing the ethylene oxide, then maintaining the reaction temperature until the pressure of the reaction kettle does not drop any more, indicating that the curing reaction is finished, cooling to 75 ℃, adding 1g of acetic acid for neutralization, and obtaining the secondary alcohol polyoxyethylene (9) ether. And measuring the chromaticity index.
For comparison, the composition of the decolorizer and the results of the color measurements are shown in Table 1.
[ example 3 ]
Adding 100g of sec-tridecanol, 1g of potassium hydroxide and 1g of EDTA-4Na into a stirred 1-pressure-rising reaction kettle, sealing the high-pressure reaction kettle, starting stirring, replacing with nitrogen for three times, evacuating and dehydrating at the temperature of 100 ℃ and the pressure of-0.096 MPa for 30 minutes, then introducing ethylene oxide into the reaction kettle, controlling the reaction temperature of 155 ℃ and the reaction pressure of 0.20MPa until the total amount of the introduced ethylene oxide is 198g, stopping introducing the ethylene oxide, then maintaining the reaction temperature until the pressure of the reaction kettle does not drop any more, indicating that the curing reaction is finished, cooling to 75 ℃, adding 1g of acetic acid for neutralization, and obtaining the secondary alcohol polyoxyethylene (9) ether. And measuring the chromaticity index.
For comparison, the composition of the decolorizer and the results of the color measurements are shown in Table 1.
[ example 4 ]
100g of sec-tridecanol, 1g of potassium hydroxide, 0.5g of sodium hypophosphite and 0.5g of EDTA-4Na are put into a 1-pressure rising reaction kettle with a stirrer, the high-pressure reaction kettle is sealed, the stirrer is started, nitrogen is replaced for three times, the high-pressure rising reaction kettle is evacuated and dehydrated for 30 minutes at the temperature of 100 ℃ and the pressure of-0.096 MPa, then ethylene oxide is introduced into the reaction kettle, the reaction temperature is controlled to be 155 ℃ and the reaction pressure is controlled to be 0.20MPa until the total amount of the introduced ethylene oxide is 198g, the introduction of the ethylene oxide is stopped, the reaction temperature is maintained until the pressure of the reaction kettle does not drop any more, the curing reaction is finished, and 1g of acetic acid is added for neutralization when the temperature is cooled to 75 ℃ to obtain the secondary alcohol polyoxyethylene. And measuring the chromaticity index.
For comparison, the composition of the decolorizer and the results of the color measurements are shown in Table 1.
[ example 5 ]
100g of sec-tridecanol, 1g of potassium hydroxide, 0.5g of sodium hypophosphite and 0.5g of diphenyl ether are put into a 1-pressure rising reaction kettle with a stirrer, the high-pressure reaction kettle is sealed, the stirrer is started, nitrogen is replaced for three times, the high-pressure rising reaction kettle is evacuated and dehydrated for 30 minutes at the temperature of 100 ℃ and the pressure of-0.096 MPa, ethylene oxide is introduced into the reaction kettle, the reaction temperature is controlled to be 155 ℃ and the reaction pressure to be 0.20MPa until the total amount of the introduced ethylene oxide is 198g, the introduction of the ethylene oxide is stopped, the reaction temperature is maintained until the pressure of the reaction kettle does not drop any more, the curing reaction is finished, 1g of acetic acid is added for neutralization when the cooling temperature reaches 75 ℃, and secondary alcohol polyoxyethylene (9) ether is obtained. And measuring the chromaticity index.
For comparison, the composition of the decolorizer and the results of the color measurements are shown in Table 1.
[ example 6 ]
100g of sec-tridecanol, 1g of potassium hydroxide, 0.5g of diphenyl ether and 0.5g of EDTA-4Na are put into a stirred 1-pressure rising reaction kettle, the high-pressure reaction kettle is sealed, the stirring is started, nitrogen is replaced for three times, the high-pressure reaction kettle is evacuated and dehydrated for 30 minutes at the temperature of 100 ℃ and the pressure of-0.096 MPa, then ethylene oxide is introduced into the reaction kettle, the reaction temperature is controlled to be 155 ℃ and the reaction pressure is controlled to be 0.20MPa until the total amount of the introduced ethylene oxide is 198g, the introduction of the ethylene oxide is stopped, the reaction temperature is maintained until the pressure of the reaction kettle does not drop any more, the curing reaction is finished, and 1g of acetic acid is added for neutralization when the cooling temperature reaches 75 ℃ to obtain the secondary alcohol polyoxyethylene (9). And measuring the chromaticity index.
For comparison, the composition of the decolorizer and the results of the color measurements are shown in Table 1.
[ example 7 ]
100g of sec-tridecanol, 1g of potassium hydroxide, 0.8g of sodium hypophosphite, 0.1g of diphenyl ether and 0.1g of EDTA-4Na are put into a 1-pressure rising reaction kettle with a stirrer, the high-pressure reaction kettle is sealed, the stirrer is started, nitrogen is replaced for three times, the high-pressure reaction kettle is evacuated and dehydrated for 30 minutes at the temperature of 100 ℃ and the pressure of-0.096 MPa, then ethylene oxide is introduced into the reaction kettle, the reaction temperature of 155 ℃ and the reaction pressure of 0.20MPa are controlled until the total amount of the introduced ethylene oxide is 198g, the introduction of the ethylene oxide is stopped, the reaction temperature is maintained until the pressure of the reaction kettle does not drop any more, the curing reaction is finished, and the secondary alcohol polyoxyethylene (9) ether is obtained by adding 1g of acetic acid for neutralization when the cooling temperature reaches 75 ℃. And measuring the chromaticity index.
For comparison, the composition of the decolorizer and the results of the color measurements are shown in Table 1.
[ example 8 ]
100g of sec-tridecanol, 1g of potassium hydroxide, 0.1g of sodium hypophosphite, 0.8g of diphenyl ether and 0.1g of EDTA-4Na are put into a 1-pressure rising reaction kettle with a stirrer, the high-pressure reaction kettle is sealed, the stirrer is started, nitrogen is replaced for three times, the high-pressure reaction kettle is evacuated and dehydrated for 30 minutes at the temperature of 100 ℃ and the pressure of-0.096 MPa, then ethylene oxide is introduced into the reaction kettle, the reaction temperature of 155 ℃ and the reaction pressure of 0.20MPa are controlled until the total amount of the introduced ethylene oxide is 198g, the introduction of the ethylene oxide is stopped, the reaction temperature is maintained until the pressure of the reaction kettle does not drop any more, the curing reaction is finished, and the secondary alcohol polyoxyethylene (9) ether is obtained by adding 1g of acetic acid for neutralization when the cooling temperature reaches 75 ℃. And measuring the chromaticity index.
For comparison, the composition of the decolorizer and the results of the color measurements are shown in Table 1.
[ example 9 ]
100g of sec-tridecanol, 1g of potassium hydroxide, 0.1g of sodium hypophosphite, 0.1g of diphenyl ether and 0.8g of EDTA-4Na are put into a 1-pressure rising reaction kettle with a stirrer, the high-pressure reaction kettle is sealed, the stirrer is started, nitrogen is replaced for three times, the high-pressure reaction kettle is evacuated and dehydrated for 30 minutes at the temperature of 100 ℃ and the pressure of-0.096 MPa, then ethylene oxide is introduced into the reaction kettle, the reaction temperature of 155 ℃ and the reaction pressure of 0.20MPa are controlled until the total amount of the introduced ethylene oxide is 198g, the introduction of the ethylene oxide is stopped, the reaction temperature is maintained until the pressure of the reaction kettle does not drop any more, the curing reaction is finished, and the secondary alcohol polyoxyethylene (9) ether is obtained by adding 1g of acetic acid for neutralization when the cooling temperature reaches 75 ℃. And measuring the chromaticity index.
For comparison, the composition of the decolorizer and the results of the color measurements are shown in Table 1.
[ example 10 ]
100g of sec-tridecanol, 1g of potassium hydroxide, 0.3g of sodium hypophosphite, 0.3g of diphenyl ether and 0.4g of EDTA-4Na are put into a 1-pressure rising reaction kettle with a stirrer, the high-pressure reaction kettle is sealed, the stirrer is started, nitrogen is replaced for three times, the reaction kettle is evacuated and dehydrated for 30 minutes at the temperature of 100 ℃ and the pressure of-0.096 MPa, then ethylene oxide is introduced into the reaction kettle, the reaction temperature of 155 ℃ and the reaction pressure of 0.20MPa are controlled until the total amount of the introduced ethylene oxide is 198g, the introduction of the ethylene oxide is stopped, the reaction temperature is maintained until the pressure of the reaction kettle does not drop any more, the curing reaction is finished, and the reaction kettle is cooled to 75 ℃ and 1g of acetic acid is added for neutralization, so that the secondary alcohol polyoxyethylene (9) ether is. And measuring the chromaticity index.
For comparison, the composition of the decolorizer and the results of the color measurements are shown in Table 1.
[ example 11 ]
100g of sec-tridecanol, 1g of potassium hydroxide, 0.4g of sodium hypophosphite, 0.3g of diphenyl ether and 0.3g of EDTA-4Na are put into a 1-pressure rising reaction kettle with a stirrer, the high-pressure reaction kettle is sealed, the stirrer is started, nitrogen is replaced for three times, the high-pressure reaction kettle is evacuated and dehydrated for 30 minutes at the temperature of 100 ℃ and the pressure of-0.096 MPa, then ethylene oxide is introduced into the reaction kettle, the reaction temperature of 155 ℃ and the reaction pressure of 0.20MPa are controlled until the total amount of the introduced ethylene oxide is 198g, the introduction of the ethylene oxide is stopped, the reaction temperature is maintained until the pressure of the reaction kettle does not drop any more, the curing reaction is finished, and the secondary alcohol polyoxyethylene (9) ether is obtained by adding 1g of acetic acid for neutralization when the cooling temperature reaches 75 ℃. And measuring the chromaticity index.
For comparison, the composition of the decolorizer and the results of the color measurements are shown in Table 1.
[ example 12 ]
100g of sec-tridecanol, 1g of potassium hydroxide, 0.3g of sodium hypophosphite, 0.4g of diphenyl ether and 0.3g of EDTA-4Na are put into a 1-pressure rising reaction kettle with a stirrer, the high-pressure reaction kettle is sealed, the stirrer is started, nitrogen is replaced for three times, the reaction kettle is evacuated and dehydrated for 30 minutes at the temperature of 100 ℃ and the pressure of-0.096 MPa, then ethylene oxide is introduced into the reaction kettle, the reaction temperature of 155 ℃ and the reaction pressure of 0.20MPa are controlled until the total amount of the introduced ethylene oxide is 198g, the introduction of the ethylene oxide is stopped, the reaction temperature is maintained until the pressure of the reaction kettle does not drop any more, the curing reaction is finished, and the reaction kettle is cooled to 75 ℃ and 1g of acetic acid is added for neutralization, so that the secondary alcohol polyoxyethylene (9) ether is. And measuring the chromaticity index.
For comparison, the composition of the decolorizer and the results of the color measurements are shown in Table 1.
TABLE 1
Claims (9)
1. The preparation method of the secondary alcohol polyoxyethylene ether comprises the step of reacting a secondary alcohol with ethylene oxide in the presence of an alkaline catalyst and a decoloring agent to obtain the secondary alcohol polyoxyethylene ether, wherein the decoloring agent comprises at least one of the following components (a), (b) and (c):
(a) an alkali metal hypophosphite;
(b) ethylenediaminetetraacetic acid and/or alkali metal salts thereof;
(c) an aromatic ether.
2. The method according to claim 1, wherein the aromatic ether is diphenyl ether.
3. The method according to claim 1, wherein the secondary alcohol is a C8-C18 secondary alcohol.
4. The method according to claim 1, wherein the secondary alcohol polyoxyethylene ether has an ethylene oxide adduct number of 7 to 10.
5. The method according to claim 1, wherein the molar ratio of ethylene oxide to secondary alcohol is 7 to 10.
6. The method according to claim 1, wherein the reaction temperature is 115 to 180 ℃.
7. The process according to claim 1, wherein the basic catalyst is an alkali metal hydroxide and/or an alkali metal alkoxide of a C1-C2 alcohol.
8. The method according to claim 1, wherein the amount of the basic catalyst is 0.05 to 1% by weight based on the secondary alcohol polyoxyethylene ether.
9. The process according to claim 1, wherein the pressure of the reaction is 0.05 to 0.5 MPa.
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