METHOD OF REARRANGEMENT OF THE MOLECULAR STRUCTURE OF ISOMERS OF TEXANOL

Abstract

Disclosed is a method of rearrangement of the molecular structure of isomers of TEXANOL, characterized in that two isomers in TEXANOL is subjected to rearrangement of the molecular structure at a certain temperature and pressure, and 2,2,4-trimethyl-1,3-pentanediol-3-isobutyrate and 2,2,4-trimethyl-1,3-pentanediol-1-isobutyrate in TEXANOL following the rearrangement are in a mass ratio of 31.81-38.65:60.80-67.65. The process of the present invention is simple, no catalyst and other aids are required, and the content of the primary ester in TEXANOL can be significantly increased, so as to improve the volatilization rate of TEXANOL in a paint film, thereby reducing the drying time of the paint film and increasing the number of scrubbing of the paint film, such that the construction conditions of aqueous acrylic paints for exterior walls become relaxed, and the occurrence of floating, whitening, efflorescence, and cracking of the paint film due to water absorption by the non-dried or partly dried paint film during moist or rainy periods is avoided.

Claims

1. A method of rearrangement of the molecular structure of isomers of TEXANOL, TEXANOL comprises of two isomers, 2,2,4-trimethyl-1,3-pentanediol-3-isobutyrate and 2,2,4-trimethyl-1,3-pentanediol-1-isobutyrate, in a mass ratio of 37.32-40.12:59.33-62.24, characterized in that the two isomers in TEXANOL is subjected to rearrangement of the molecular structure at a certain temperature and pressure, and 2,2,4-trimethyl-1,3-pentanediol-3-isobutyrate and 2,2,4-trimethyl-1,3-pentanediol-1-isobutyrate in TEXANOL following the rearrangement are in a mass ratio of 31.81-38.65:60.80-67.65.

2. The method of rearrangement of the molecular structure of isomers of TEXANOL of claim 1, wherein the temperature is 150-250° C. and the pressure is 0.1-2.0 MPa.

3. The method of rearrangement of the molecular structure of isomers of TEXANOL of claim 1, wherein the pressure is maintained for 0.25-5 h.

4. The method of rearrangement of the molecular structure of isomers of TEXANOL of claim 2, wherein the pressure is maintained for 0.25-5 h.

Description

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Example 1

[0011] 1700 g TEXANOL (having a content of 99.45%) with 2,2,4-trimethyl-1,3-pentanediol-3-isobutyrate and 2,2,4-trimethyl-1,3-pentanediol-1-isobutyrate being in a mass ratio of 40.12:59.33, was charged into a WHFS-3-type reactor. The reactor was controlled at a temperature of 160-165° C. and at a pressure of 0.3 MPa and maintained at this temperature and pressure for 5 h. The experimental results show that 2,2,4-trimethyl-1,3-pentanediol-3-isobutyrate and 2,2,4-trimethyl-1,3-pentanediol-1-isobutyrate are in a mass ratio of 38.65:60.80.

Example 2

[0012] 1700 g TEXANOL (having a content of 99.45%) with 2,2,4-trimethyl-1,3-pentanediol-3-isobutyrate and 2,2,4-trimethyl-1,3-pentanediol-1-isobutyrate being in a mass ratio of 40.12:59.33, was charged into a WHFS-3-type reactor. The reactor was controlled at a temperature of 160-165° C. and at a pressure of 0.6 MPa and maintained at this temperature and pressure for 0.25 h. The experimental results show that 2,2,4-trimethyl-1,3-pentanediol-3-isobutyrate and 2,2,4-trimethyl-1,3-pentanediol-1-isobutyrate are in a mass ratio of 38.05:61.40.

Example 3

[0013] 1500 g TEXANOL (having a content of 99.40%) with 2,2,4-trimethyl-1,3-pentanediol-3-isobutyrate and 2,2,4-trimethyl-1,3-pentanediol-1-isobutyrate being in a mass ratio of 38.12:61.28, was charged into a WHFS-3-type reactor. The reactor was controlled at a temperature of 170-180° C. and at a pressure of 1.6 MPa and maintained at this temperature and pressure for 20 min. The experimental results show that 2,2,4-trimethyl-1,3-pentanediol-3-isobutyrate and 2,2,4-trimethyl-1,3-pentanediol-1-isobutyrate are in a mass ratio of 35.01:64.39.

Example 4

[0014] 1500 g TEXANOL (having a content of 99.34%) with 2,2,4-trimethyl-1,3-pentanediol-3-isobutyrate and 2,2,4-trimethyl-1,3-pentanediol-1-isobutyrate being in a mass ratio of 38.12:61.22, was charged into a WHFS-3-type reactor. The reactor was controlled at a temperature of 170-180° C. and at a pressure of 0.8 MPa and maintained at this temperature and pressure for 35 min. The experimental results show that 2,2,4-trimethyl-1,3-pentanediol-3-isobutyrate and 2,2,4-trimethyl-1,3-pentanediol-1-isobutyrate are in a mass ratio of 33.11:66.23.

Example 5

[0015] 1500 g TEXANOL (having a content of 99.56%) with 2,2,4-trimethyl-1,3-pentanediol-3-isobutyrate and 2,2,4-trimethyl-1,3-pentanediol-1-isobutyrate being in a mass ratio of 37.32:62.24, was charged into a WHFS-3-type reactor. The reactor was controlled at a temperature of 190-210° C. and at a pressure of 1.8 MPa and maintained at this temperature and pressure for 45 min. The experimental results show that 2,2,4-trimethyl-1,3-pentanediol-3-isobutyrate and 2,2,4-trimethyl-1,3-pentanediol-1-isobutyrate are in a mass ratio of 31.91:67.65.

Example 6

[0016] 1500 g TEXANOL (having a content of 99.37%) with 2,2,4-trimethyl-1,3-pentanediol-3-isobutyrate and 2,2,4-trimethyl-1,3-pentanediol-1-isobutyrate being in a mass ratio of 38.52:60.85, was charged into a WHFS-3-type reactor. The reactor was controlled at a temperature of 150-155° C. and at a pressure of 2.0 MPa and maintained at this temperature and pressure for 2 h. The experimental results show that 2,2,4-trimethyl-1,3-pentanediol-3-isobutyrate and 2,2,4-trimethyl-1,3-pentanediol-1-isobutyrate are in a mass ratio of 31.81:67.56.

Example 7

[0017] 1500 g TEXANOL (having a content of 99.23%) with 2,2,4-trimethyl-1,3-pentanediol-3-isobutyrate and 2,2,4-trimethyl-1,3-pentanediol-1-isobutyrate being in a mass ratio of 37.56:61.67, was charged into a WHFS-3-type reactor. The reactor was controlled at a temperature of 215-250° C. and at a pressure of 0.1 MPa and maintained at this temperature and pressure for 3 h. The experimental results show that 2,2,4-trimethyl-1,3-pentanediol-3-isobutyrate and 2,2,4-trimethyl-1,3-pentanediol-1-isobutyrate are in a mass ratio of 32.27:66.96.