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Device for refining hexamethylene diisocyanate and method thereof

A technology of hexamethylene diisocyanate and rectifying tower is applied in the field of production equipment for refining hexamethylene diisocyanate, and can solve the problems of reduced yield, HDI polymerization, inoperability of distillation tower and the like

Inactive Publication Date: 2013-11-06
甘肃银光聚银化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The distillation of HDI cannot be distilled according to the conventional method, because the solvent (such as o-dichlorobenzene) and impurities with a boiling point slightly lower than the boiling point of HDI must be distilled from the top of the tower during rough distillation, or the impurities must be distilled from the top of the tower during rectification. HDI, the bottom temperature of the tower is high, and HDI is prone to polymerization at high temperature for a long time, so that the yield will be reduced, and the polymer will increase to block the reboiler at the bottom of the tower or even block the tower so that the distillation tower cannot operate

Method used

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  • Device for refining hexamethylene diisocyanate and method thereof
  • Device for refining hexamethylene diisocyanate and method thereof
  • Device for refining hexamethylene diisocyanate and method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1: process condition control is as follows table:

[0021]

[0022] Distillation steps

[0023] a Turn on the heat conduction oil furnace through the on-site control cabinet to make the temperature reach 205°C, and make a record.

[0024] b Close the valves on the top of the tower and the extraction pipeline of the tower kettle.

[0025] c. Open the feed valve of the first preheater 2. When the temperature reaches 90° C. and the jacket oil temperature of the distillation column (3) is higher than 95° C. and rises linearly, open the feed valve of the top of the tower and the automatic control of the tower.

[0026] d Open the circulating water valve of the first condenser 6 at the top of the tower.

[0027] e Start the first vacuum pump 7, control the vacuum degree to be 0.094Mpa, and make a record.

[0028] f Open the heat transfer oil flow regulating valve in the 3rd kettle of the distillation tower, start the heat transfer oil furnace oil pump, and co...

Embodiment 2

[0045] Embodiment 2: process condition control is as follows table:

[0046]

[0047] Operational steps according to the above conditions include:

[0048] a) Open the outlet valve of the crude product tank 1, open the feed valve of the first preheater 2, and start feeding when the temperature reaches 160-170°C, and the crude 1,6-hexamethylene diisocyanate solution enters the middle part of the distillation tower 3, the tower still 4 After the temperature is higher than 195°C, open the first condenser 6, start the first vacuum pump 7, and control the vacuum degree to 0.070-0.089Mpa; start to control the full reflux operation of the distillation tower 3 for half an hour, when the temperature at the top of the tower reaches the temperature required by the process, Sampling and analysis, when it meets the process requirements, start to slowly adjust to the specified reflux flow, sampling and analysis at the top of the tower, when the HDI content contained in the o-dichlorobenz...

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Abstract

The invention specifically relates to production equipment for refining hexamethylene diisocyanate and a method thereof. A stirrer is respectively arranged in the middle of the bottom of both a distillation column and a rectifying tower which are provided with a stirring device, and stirring wings are a frame type. The method for refining hexamethylene diisocyanate comprises the following steps: (1) letting an synthesized HDI solution enter a distillation column through a heat exchanger, starting a first vacuum pump, and starting a first stirrer in the column bottom while the agitation speed is less than or equal to 60rpm / min; Starting a first condenser on the tower top, evaporating all o-dichlorobenzene, continuously discharging by the distillation column and entering a mixing tank; and (ii) adding a DEIP solvent into the mixing tank, uniformly mixing crude HDI and the DEIP solvent according to the HDI-DEIP ratio of 1:1-1.5, sending the mixture into the rectifying tower to firstly evaporate mono-isocyanate chloride and continuously evaporate the HDI, drawing forth the DEIP for recycling, stirring high polymer residue in a heating vessel and discharging regularly, and carrying out burning treatment. The device and method provided by the invention can be applied in distillation separation and purification production technology which is easy to generate auto-agglutination phenomenon under the distillation condition.

Description

technical field [0001] The present invention relates to the production equipment and method of aliphatic diisocyanate, in particular to the production equipment and method of refining hexamethylene diisocyanate. Background technique [0002] As an important class of organic chemical intermediates, isocyanates are widely used in industry, agriculture, medicine and health. These compounds are widely used in the synthesis of polyisocyanates, polyurethanes, polyureas, polymer adhesives, insecticides, herbicides, etc. Hexamethylene diisocyanate (1,6-hexamethylene diisocyanate, English abbreviation HDI) is the aliphatic isocyanate with the largest demand in the polyurethane industry at present, and has become the successor toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI ), polymethyl polyphenylene isocyanate (PAPI), isocyanate species with large demand, mainly used in the production of automotive OEM coatings and repair paints, aircraft OEM coatings and repair paint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C265/14C07C263/20
Inventor 余咸旱白卫兵陶春霞张克武
Owner 甘肃银光聚银化工有限公司
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