Method for simultaneously synthesizing 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate andhexadecanedioic diester

Abstract

The invention provides a method for simultaneously synthesizing 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate and hexadecanedioic diester, which comprises the following steps: S1, under the action of an acid catalyst, carrying out ester exchange reaction on 2, 2, 4-trimethyl-1, 3-pentanediol and isobutyl isobutyrate to generate 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate and hexadecanedioic diester; S2, distilling out isobutanol generated in the transesterification reaction process, removing impurities through distillation of a rectifying tower, and finally obtaining the products of 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate and hexadecanedioic diester. According to the method for simultaneously synthesizing 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate and hexadecanedioic diester, S2O82- / ZrO2-Al2O3-Sc2O3 is used as a solid acid catalyst, the Sc2O3 improves the surface property of ZrO2-Al2O3, increases the pore volume and is beneficial to improvement of reaction activity, and the Sc2O3 can change the chemical state of the surface of the catalyst, so that the positive polarization degree of surface elements of the catalyst is improved, therefore, the activity of the catalyst is improved, the service life of the catalyst is prolonged, and finally the yield of simultaneous synthesis of 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate and hexadecanedioic diester is increased.

Description

technical field

[0001] The invention relates to the technical field of fine chemicals, in particular to a method for simultaneously synthesizing dodecyl alcohol ester and hexadecanyl diester. Background technique

[0002] 2,2,4-Trimethyl-1,3-pentanediol monoisobutyrate (dodecyl alcohol ester) and 2,2,4-trimethyl-1,3-pentanediol diisobutyrate Ester (hexadecyl diester) is a commonly used coalescent for water-based coatings. Coalescing aids soften the latex polymer particles, allowing them to coalesce and fuse together to better form films. In addition to reducing the minimum film forming temperature (MFT) of latex paint, film-forming additives can also improve the film properties of latex paint such as weather resistance, scrubability, and color development of the coating.

[0003] At present, the most important method for synthesizing dodecyl alcohol esters is the isobutyraldehyde basic catalytic method, that is, isobutyraldehyde is used as a raw material, carried out under...

Examples

Embodiment 1

[0035] A method for simultaneously synthesizing dodecyl alcohol ester and hexadecyl diester, wherein: comprising the following steps:

[0036] S1. Under the action of an acidic catalyst, 2,2,4-trimethyl-1,3-pentanediol is transesterified with isobutyl isobutyrate to generate dodecyl alcohol ester and hexadecyl diester, The acidic catalyst is p-toluenesulfonic acid, and the acidic catalyst consumption is 0.3% of the total mass of the feed;

[0037]S2. in the transesterification reaction process, the isobutanol generated by the reaction is distilled out, and the impurities are removed by distillation in a rectification tower, and finally the product dodecyl alcohol ester and hexadecyl diester are obtained, and the dodecyl alcohol ester of generation is and hexadecyl diester to remove the acidic catalyst, and separate through ordinary rectification to obtain 2,2,4-trimethyl-1,3-pentanediol diisobutyrate and 2,2,4-trimethyl -1,3-pentanediol monoisobutyrate; the temperature of the...

Embodiment 2

[0039] A method for simultaneously synthesizing dodecyl alcohol ester and hexadecyl diester, wherein: comprising the following steps:

[0040] S1. Under the action of an acidic catalyst, 2,2,4-trimethyl-1,3-pentanediol is transesterified with isobutyl isobutyrate to generate dodecyl alcohol ester and hexadecanyl diester, The temperature of the transesterification reaction is 170°C, and the reaction time is 8h;

[0041] S2. in the transesterification reaction process, the isobutanol generated by the reaction is distilled out, and the impurities are removed by distillation in a rectification tower, and finally the product dodecyl alcohol ester and hexadecyl diester are obtained, and the dodecyl alcohol ester of generation is and hexadecyl diester to remove the acidic catalyst, and separate through ordinary rectification to obtain 2,2,4-trimethyl-1,3-pentanediol diisobutyrate and 2,2,4-trimethyl -1,3-pentanediol monoisobutyrate; the normal distillation temperature is 160°C and t...

Embodiment 3

[0049] A method for simultaneously synthesizing dodecyl alcohol ester and hexadecyl diester, wherein: comprising the following steps:

[0050] S1. Under the action of an acidic catalyst, 2,2,4-trimethyl-1,3-pentanediol is transesterified with isobutyl isobutyrate to generate dodecyl alcohol ester and hexadecanyl diester, The temperature of the transesterification reaction is 190°C, and the reaction time is 3h;

[0051] S2. in the transesterification reaction process, the isobutanol generated by the reaction is distilled out, and the impurities are removed by distillation in a rectification tower, and finally the product dodecyl alcohol ester and hexadecyl diester are obtained, and the dodecyl alcohol ester of generation is and hexadecyl diester without removing the acidic catalyst, directly carry out reactive distillation to obtain dodecyl alcohol ester and hexadecyl diester, the temperature of the reaction rectification is 185° C., and the pressure is -0.099 MPa.

[0052] Th...

technical field

[0001] The invention relates to the technical field of fine chemicals, in particular to a method for simultaneously synthesizing dodecyl alcohol ester and hexadecanyl diester. Background technique

[0002] 2,2,4-Trimethyl-1,3-pentanediol monoisobutyrate (dodecyl alcohol ester) and 2,2,4-trimethyl-1,3-pentanediol diisobutyrate Ester (hexadecyl diester) is a commonly used coalescent for water-based coatings. Coalescing aids soften the latex polymer particles, allowing them to coalesce and fuse together to better form films. In addition to reducing the minimum film forming temperature (MFT) of latex paint, film-forming additives can also improve the film properties of latex paint such as weather resistance, scrubability, and color development of the coating.

[0003] At present, the most important method for synthesizing dodecyl alcohol esters is the isobutyraldehyde basic catalytic method, that is, isobutyraldehyde is used as a raw material, carried out under...

Examples

Embodiment 1

[0035] A method for simultaneously synthesizing dodecyl alcohol ester and hexadecyl diester, wherein: comprising the following steps:

[0036] S1. Under the action of an acidic catalyst, 2,2,4-trimethyl-1,3-pentanediol is transesterified with isobutyl isobutyrate to generate dodecyl alcohol ester and hexadecyl diester, The acidic catalyst is p-toluenesulfonic acid, and the acidic catalyst consumption is 0.3% of the total mass of the feed;

[0037]S2. in the transesterification reaction process, the isobutanol generated by the reaction is distilled out, and the impurities are removed by distillation in a rectification tower, and finally the product dodecyl alcohol ester and hexadecyl diester are obtained, and the dodecyl alcohol ester of generation is and hexadecyl diester to remove the acidic catalyst, and separate through ordinary rectification to obtain 2,2,4-trimethyl-1,3-pentanediol diisobutyrate and 2,2,4-trimethyl -1,3-pentanediol monoisobutyrate; the temperature of the...

Embodiment 2

[0039] A method for simultaneously synthesizing dodecyl alcohol ester and hexadecyl diester, wherein: comprising the following steps:

[0040] S1. Under the action of an acidic catalyst, 2,2,4-trimethyl-1,3-pentanediol is transesterified with isobutyl isobutyrate to generate dodecyl alcohol ester and hexadecanyl diester, The temperature of the transesterification reaction is 170°C, and the reaction time is 8h;

[0041] S2. in the transesterification reaction process, the isobutanol generated by the reaction is distilled out, and the impurities are removed by distillation in a rectification tower, and finally the product dodecyl alcohol ester and hexadecyl diester are obtained, and the dodecyl alcohol ester of generation is and hexadecyl diester to remove the acidic catalyst, and separate through ordinary rectification to obtain 2,2,4-trimethyl-1,3-pentanediol diisobutyrate and 2,2,4-trimethyl -1,3-pentanediol monoisobutyrate; the normal distillation temperature is 160°C and t...

Embodiment 3

[0049] A method for simultaneously synthesizing dodecyl alcohol ester and hexadecyl diester, wherein: comprising the following steps:

[0050] S1. Under the action of an acidic catalyst, 2,2,4-trimethyl-1,3-pentanediol is transesterified with isobutyl isobutyrate to generate dodecyl alcohol ester and hexadecanyl diester, The temperature of the transesterification reaction is 190°C, and the reaction time is 3h;

[0051] S2. in the transesterification reaction process, the isobutanol generated by the reaction is distilled out, and the impurities are removed by distillation in a rectification tower, and finally the product dodecyl alcohol ester and hexadecyl diester are obtained, and the dodecyl alcohol ester of generation is and hexadecyl diester without removing the acidic catalyst, directly carry out reactive distillation to obtain dodecyl alcohol ester and hexadecyl diester, the temperature of the reaction rectification is 185° C., and the pressure is -0.099 MPa.

[0052] Th...

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