Method for recycling ditrimethylolpropane

A technology for bis-trimethylolpropane and trimethylol-propane, which is applied in the field of recycling bis-trimethylolpropane, can solve problems such as low operating temperature, avoid pollution, be beneficial to environmental protection, equipment and infrastructure. less demanding effects

Active Publication Date: 2013-05-01
JIANGSU BAICHUAN GAOKE NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] The purpose of the present invention is to overcome some shortcomings in the existing production or recovery technology of ditrimethylolpropane, to provide a method for recovery of ditrimethylolpropane that is simple and economical, does not require high vacuum rectification, and has a low operating temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Step 1. After transferring the heavy components at the bottom of the rectification tank in the trimethylolpropane refining process to the intermediate tank maintained at 128-132 °C, a small amount of impurities with high crystallization points were found to be precipitated, filtered while hot, and the filtrate was collected in a dynamic In the raw material liquid tank of the melting crystallizer;

[0046] Step 2: Measure 2500kg of the liquid feed liquid in the raw material liquid tank through the metering tank, transfer it to the first collecting tank of the crystallizer, and use a pump to circulate it to the top of the dynamic melting crystallizer, after being distributed by the distributor, from It flows through the crystallization tube from top to bottom, and the temperature of the refrigerant on the shell side of the crystallizer is programmed so that the temperature on the shell side drops from 120 °C to 105 °C at a rate of 0.2 °C / min, and the ditrimethylolpropane i...

Embodiment 2

[0056] Step 1. After transferring the heavy components at the bottom of the rectification tank in the trimethylolpropane refining process to the intermediate tank whose temperature is maintained at 126-130°C, no impurities precipitated due to high crystallization point were found in it. The batch of materials is pumped into the raw material liquid tank of the dynamic melting crystallizer;

[0057] Step 2: Measure 2500kg of the liquid feed liquid in the raw material liquid tank through the metering tank, transfer it to the first collecting tank of the crystallizer, and use a pump to circulate it to the top of the dynamic melting crystallizer, after being distributed by the distributor, from It flows through the crystallization tube from top to bottom, and the temperature of the refrigerant on the shell side of the crystallizer is programmed so that the temperature on the shell side drops from 120 °C to 105 °C at a rate of 0.3 °C / min, and the ditrimethylolpropane in the feed liqu...

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Abstract

The invention relates to a method for recycling ditrimethylolpropane, which is characterized by comprising the steps of: transferring heavy constituents at the bottom of a rectifying kettle in a refining procedure of trimethylolpropane, then filtering when hot in necessity, removing impurities with high crystallization point, transferring to a dynamic melt crystallizer, carrying out separation of crystallization, sweating and melting at a programmed temperature to ensure that other main impurities of the ditrimethylolpropane and the heavy constituents are separated; and carrying out refining of crystallization, sweating and melting on the collected rough ditrimethylolpropane at a programmed temperature to obtain a ditrimethylolpropane product with content of higher than 95 percent, which accords with the general requirements of industrial products. If higher requirements on platinum-cobalt chroma of not more than 15APHA are required in the color number of the products, the color is removed by combining the melt crystallization method with steps of absorbing and filtering, and the like. The method for recycling the ditrimethylolpropane has the advantages of simple operation, low cost, no need of high vacuum rectification, and low operation temperature.

Description

(1) Technical field [0001] The invention relates to a method for recovering ditrimethylolpropane, in particular to a method for recovering ditrimethylolpropane from heavy components in the production of trimethylolpropane, and belongs to the technical field of recovery of organic chemical products. (2) Background technology [0002] Ditrimethylolpropane is a by-product in the process of producing trimethylolpropane, which is formed by intermolecular dehydration of 2 molecules of trimethylolpropane. Its English name is ditrimethylolpropane, its English abbreviation is di-TMP, and its CAS number is 23235-61-2. [0003] Japan's Mitsubishi Gas Chemical Co., Ltd. has obtained an authorized invention patent in China - "Preparation Method of Bis(trimethylolpropane)", which is translated into di-trimethylolpropane, and 2 molecules of trimethylolpropane Bis-TMP condensed with 1 molecule of formaldehyde is translated into ditrimethylolpropane. Since di-TMP has been recognized as dit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/13C07C41/40C07C41/36
Inventor 郑渊博郑铁江薛建军吴晓明
Owner JIANGSU BAICHUAN GAOKE NEW MATERIAL CO LTD
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