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Purification method of di(trimethylolpropane)

A technology of ditrimethylolpropane and trimethylolpropane, which is applied in the field of ditrimethylolpropane purification, can solve the problem that ditrimethylolpropane cannot be recovered, achieve thin film evaporation temperature saving, and reduce production cost effect

Active Publication Date: 2017-12-22
NANTONG BAICHUAN NEW MATERIAL CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for purifying ditrimethylolpropane, which effectively avoids the situation that the previous ditrimethylolpropane cannot be recovered after being washed away by water, and the ditrimethylolpropane recovered by this method Propane can be increased by 15-20% compared with ordinary process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The purification method of ditrimethylolpropane of the present embodiment, this purification method comprises the steps:

[0016] (1) Set the flow rate to 2m 3 The heavy component of trimethylolpropane / h is sent to the thin film evaporator, and the temperature is controlled at 150°C, and the secondary heavy component of trimethylolpropane is obtained at the bottom of the thin film evaporator;

[0017] (2) Add 2t of trimethylolpropane secondary heavy component at the bottom of the thin film evaporator, 5t of ditrimethylolpropane secondary mother liquor and 2t of soft water into the dissolution tank, start stirring for 1.5h, and control the temperature at about 70°C , and then stand for 2 hours to separate the light oil above;

[0018] (3) Transfer the material after the oil separation in the dissolution tank to the crystallization tank, turn on the crystallization tank to stir, and open the chilled water valve to cool down. When the temperature drops to 20°C, keep it wa...

Embodiment 2

[0024] The purification method of ditrimethylolpropane of the present embodiment, this purification method comprises the steps:

[0025] (1) Set the flow rate to 2m 3 The trimethylolpropane heavy component of / h is sent into the thin-film evaporator, and the temperature is controlled at 160° C. to obtain the secondary heavy component of trimethylolpropane at the bottom of the thin-film evaporator;

[0026] (2) Add 2t of trimethylolpropane secondary heavy component at the bottom of the thin film evaporator, 6t of ditrimethylolpropane secondary mother liquor and 4t of soft water into the dissolution kettle, start stirring for 1.5h, and control the temperature at about 70°C , and then stand for 2 hours to separate the light oil above;

[0027] (3) Transfer the material after the oil separation in the dissolution tank to the crystallization tank, turn on the crystallization tank to stir, and open the chilled water valve to cool down. When the temperature drops to 18°C, keep it wa...

Embodiment 3

[0033] The purification method of ditrimethylolpropane of the present embodiment, this purification method comprises the steps:

[0034] (1) Set the flow rate to 2m 3 The heavy component of trimethylolpropane / h is sent into the thin film evaporator, the temperature is controlled at 155°C, and the secondary heavy component of trimethylolpropane is obtained at the bottom of the thin film evaporator;

[0035] (2) Add 2t of trimethylolpropane secondary heavy component at the bottom of the thin film evaporator, 4t of ditrimethylolpropane secondary mother liquor and 2t of soft water into the dissolution kettle, start stirring to stir well, and then let it stand for 1h Separate the light oil above;

[0036] (3) Transfer the material after the oil separation in the dissolution tank to the crystallization tank, turn on the crystallization tank to stir, and open the chilled water valve to cool down. When the temperature drops to 19°C, keep it warm for 4.5 hours;

[0037] (4) Centrifug...

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PUM

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Abstract

The invention relates to a purification method of di(trimethylolpropane). The purification method comprises the steps of: (1) sending a trimethylolpropane heavy component into a film evaporator, adding a trimethylolpropane secondary heavy component at the bottom, a di-trimethylolpropane secondary mother liquid and soft water into a dissolution kettle, stirring the substances evenly, then performing standing for 1-2h, and then separating the upper light oil; (2) transferring the oil separated material from the dissolution kettle into a crystallization kettle, when the temperature falls to 18-20DEG C, and conducting heat preservation for 3-6h; (3) centrifuging the material crystallized in step (3) by a vacuum belt filter; (4) adding soft water into the centrifuged di(trimethylolpropane) filter cake, then transferring the mixture into an evaporation kettle for evaporation dehydration; and (5) conducting slicing and packaging on the di(trimethylolpropane) with a water content of less than 0.5%. The purification method provided by the invention effectively avoids the previous circumstance that di(trimethylolpropane) is washed off and cannot be recovered, and the recovered di(trimethylolpropane) is increased by 15-20% than ordinary process.

Description

technical field [0001] The invention belongs to the field of purification of fine chemical industry, in particular to a method for purifying ditrimethylolpropane. Background technique [0002] In the production process of ditrimethylolpropane, there are several production steps of dissolution, decolorization, crystallization, filtration, evaporation and slicing. The process of dissolution is the secondary recombination of trimethylolpropane in the production process with mother liquor and deionized water. Since the secondary heavy component of trimethylolpropane has a component heavier than ditrimethylolpropane, we usually call it heavy oil. If this heavy oil is not separated in advance, it will be taken to the later stage After the crystallization process, black oil lumps will be formed directly, which makes it difficult to remove them during centrifugation, thus affecting the quality of the product. [0003] Therefore, a strong acid should be added during the dissolution ...

Claims

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Application Information

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IPC IPC(8): C07C43/13C07C41/34C07C41/40
CPCC07C41/34C07C41/40C07C43/132
Inventor 郑铁江曹圣平孙百亚赵跃俞晔虎吴晓明姜伟伟杜法举马俊华
Owner NANTONG BAICHUAN NEW MATERIAL CO LTD