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Continuous rectification device of isocyanate and rectification process thereof

An isocyanate and rectification technology, which is applied in the purification/separation, fractionation, and distillation separation of isocyanate derivatives, can solve the problems of easy polymerization of isocyanates at high temperature, difficult separation of impurities, and high energy consumption. Distillation efficiency, small volume effect

Inactive Publication Date: 2020-06-23
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of high energy consumption, easy polymerization of isocyanate at high temperature, low yield and difficult separation of impurities in the rectification device in the prior art, and provide a rectification device that greatly improves the rectification efficiency. The continuous rectification device and rectification process

Method used

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  • Continuous rectification device of isocyanate and rectification process thereof
  • Continuous rectification device of isocyanate and rectification process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The crude product of 1,5-pentane diisocyanate containing 10% of solvent, 1% of impurity and 89% of 1,5-pentane diisocyanate was rectified.

[0043] The total number n of packing layers in the supergravity separator is 3; the vertical gap h3 between adjacent packing layers is 20mm; the ratio of the outer diameter d1 of the packing layer to the inner diameter D of the separator is 0.96; the height of the packing layer h2 is related to the packing layer The ratio of the outer diameter d1 is 0.35:1; the ratio of the diameter d2 of the central axis to the outer diameter d1 of the packing layer is 0.085:1; the total height of the three packing layers htotal=n×h2+2×h3, htotal and separation The ratio of the height H of the supergravity separator is 0.9:1; the ratio of the distance h1 from the center point of the return port of the supergravity separator to the top of the supergravity separator and the height H of the supergravity separator is 0.1:1.

[0044] Pump the above-men...

Embodiment 2

[0046] Using the same rectification device as in Example 1, the crude 1,5-pentane diisocyanate containing 2% solvent, 0.8% impurities and 97.2% 1,5-pentane diisocyanate was rectified.

[0047] Pump the above-mentioned crude 1,5-pentanediisocyanate into reboiler 1, close the inlet valve of reboiler 1, open all other valves, connect the outlet of the upper end of the second condenser 4 to the vacuum system, and reduce the system pressure to - Below 0.098MPa, close the reflux pump 6 inlet valve, the discharge pump 7 inlet valve, and the product receiving tank 9 inlet valve; then turn on the supergravity separator 2 motor and adjust the speed to 1000r / min; set the reboiler 1 temperature to 115 ℃, the supergravity outlet gas phase temperature is 100 ℃; after the distillate enters the buffer tank, open the inlet valve of the reflux pump 6, turn on the reflux pump 6 and adjust the reflux ratio to 3:1; open the inlet valve of the discharge pump 7, and turn on the discharge pump 7 and ...

Embodiment 3

[0049] Rectify the crude m-xylylene diisocyanate containing 5% solvent, 1% impurity and 94% m-xylylene diisocyanate.

[0050] The total number n of packing layers in the supergravity separator is 4; the vertical gap h3 between adjacent packing layers is 15mm; the ratio of the outer diameter d1 of the packing layer to the inner diameter D of the separator is 0.97; the height of the packing layer h2 is related to the packing layer The ratio of the outer diameter d1 is 0.38:1; the ratio of the diameter d2 of the central axis to the outer diameter d1 of the packing layer is 0.09:1; the total height h total of the four packing layers = n×h2+3×h3, h total and separation The ratio of the height H of the supergravity separator to the height H of the supergravity separator is 0.15:1.

[0051] The above-mentioned m-xylylene diisocyanate crude product is pumped into the reboiler 1, the valve of the feed port of the reboiler 1 is closed, all the other valves are opened, the outlet at the ...

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Abstract

The invention particularly discloses a continuous rectification device of isocyanate and a rectification process thereof. The device comprises a reboiler, a supergravity separator, a first condenser,a second condenser, a buffer tank, a reflux pump, a discharge pump, a front fraction receiving tank and a product receiving tank, the design of a built-in filler component of the supergravity separator is a key technology for realizing high-efficiency separation of isocyanate, and the isocyanate has the advantages of short stroke, short residence time and low temperature in the supergravity separator, so that the problems of long isocyanate stroke, poor separation effect, long rectification time, high-temperature easy polymerization and low product yield when the traditional tower type rectification is utilized are effectively solved. According to the method, the separation efficiency can be remarkably improved, the production capacity is improved, the production cost is reduced, and the method is suitable for rectification of isocyanate, especially rectification of 1,5-pentamethylene diisocyanate.

Description

technical field [0001] The invention belongs to the field of organic chemical industry, and in particular relates to a continuous rectification device and a rectification process of isocyanate. Background technique [0002] With the rapid development of economy and technology, society's demand for new energy and new materials is increasing, and new polyurethane materials have attracted more and more attention. Polyurethane is generally formed by polyaddition of isocyanates and hydroxyl compounds, and aliphatic isocyanates have become a research hotspot because they can overcome the shortcomings of aromatic isocyanates. For example, Covestro launched a bio-based aliphatic isocyanate curing agent at Eurocoats 2015 eco N7300. The performance of this curing agent product has many advantages, for example, it can enhance the chemical resistance, scratch resistance, easy painting of paints and adhesives, and has higher gloss and yellowing resistance. Its basic raw material is 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/14B01D3/32C07C263/20C07C265/14
CPCB01D3/143B01D3/322C07C263/20C07C265/14
Inventor 陈可泉李炜韩邦友欧阳平凯
Owner NANJING UNIV OF TECH
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