Process for producing hexamethylol melamine

A technology of hexamethylol melamine and methylol melamine, which is applied in the field of production and preparation of hexamethylol melamine, can solve the problems of low formaldehyde content and difficulty in the treatment of formaldehyde wastewater, achieve low formaldehyde content, save transportation costs, and reduce costs Effect

Active Publication Date: 2011-04-13
SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to overcome the deficiency that existing formaldehyde waste water treatment is difficult in the existing hexamethylolmelamine production, provide a kind of new hexamethylolmelamine production technique, formaldehyde content is low in the production waste water that this technique produces, Can be recycled in the production process

Method used

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  • Process for producing hexamethylol melamine
  • Process for producing hexamethylol melamine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Formaldehyde process:

[0052] For the preparation method of formaldehyde in this embodiment, be iron-molybdenum method formaldehyde process. The raw material methanol is metered and enters the methanol evaporator for gasification, and then mixes with air mixed gas and steam, and the mixed gas undergoes oxidative dehydrogenation under the action of the high temperature (250-400°C) of the heating element in the oxidation chamber and the iron-molybdenum oxide catalyst reaction. After the reaction gas is cooled, it enters the absorption tower and is circulated and absorbed by desalinated water, and part of the circulating liquid is extracted to obtain a formaldehyde solution (concentration: 50% (wt)).

[0053] Mixing process:

[0054] Send 1.39 t / h of formaldehyde solution with a concentration of 50% (wt), 0.01 t / h of NaOH solution with a concentration of 10% (wt), and 3.856 t / h of evaporating liquid into a static mixer for uniform mixing, and adjust the pH value of the ...

Embodiment 2

[0064] Reaction crystallization process:

[0065] Pump the suspension slurry into the tubular reactor and heat it to 60°C. The melamine and formaldehyde start to react to form hexamethylol melamine. After reacting for 1 hour, it was sent to a crystallizer, and was controlled to stay at 60°C for 4 hours to form a hexamethylolmelamine crystal slurry with a solid content of 20% (wt).

[0066] All the other procedures are with embodiment 1.

Embodiment 3

[0068] Mixing process:

[0069] Formaldehyde solution with concentration of 50% (wt) 1.45t / h, concentration of 20% (wt) Na 2 CO 3 0.015t / h of liquid and 3.856t / h of evaporated liquid are sent to the static mixer for uniform mixing, and the pH value is 8-9. The solution coming out from the static mixer and the melamine 0.475t / h continuously delivered after being weighed by the spiral weighing device are mixed under stirring to form a uniform suspension slurry. All the other procedures are with embodiment 1.

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Abstract

The invention discloses a process for producing hexamethylol melamine, belonging to the field of production and preparation of hexamethylol melamine. The process comprises the steps such as mixing, reaction and crystallization, centrifugalization, evaporation and the like, wherein evaporation auxiliary formate is added when in evaporation so as to change the relative volatility of formaldehyde and water. Furthermore, the process for producing the hexamethylol melamine together with a formaldehyde device can also be used for co-production, so that the concentration of the produced formaldehyde solution is improved to 45wt%-55wt%. The produced hexamethylol melamine provided by the invention has the advantages of small amount of waste water and low formaldehyde content, namely, if 1 ton of hexamethylol melamine is produced, 1 ton of waste water containing 0.84wt% of formaldehyde is discharged. After the process provided by the invention and the formaldehyde device are used for co-production, the formaldehyde production cost and transportation cost are reduced, and the comprehensive cost is 10% less than that of other processes.

Description

technical field [0001] The invention relates to a process for producing hexamethylol melamine, in particular a process for co-production with a formaldehyde device, and belongs to the field of production and preparation of hexamethylol melamine. Background technique [0002] Hexamethylolmelamine is also known as 2,4,6-three (N,N-dimethylolamino)-1,3,5-triazine (C 3 N 6 (CH 2 Oh) 6 ), mainly used as raw materials for architectural coatings and automotive adhesives, suitable for the production of high-performance adhesives A, intermediates of adhesives RA, paint additives, clothing finishing agents, high-performance composite materials and the processing of downstream fine chemical products. [0003] At present, the traditional process of producing hexamethylol melamine is to use melamine and formaldehyde aqueous solution (industrial formaldehyde) for intermittent production. The formaldehyde aqueous solution and melamine are reacted under alkaline conditions at a temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D251/64C02F1/04
Inventor 李健吴本勇李刚郭志刚易江林雷林
Owner SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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