Pentahydroxy-methylmelamine and hexahydroxy-methylmelamine joint-production method

A technology of hexamethylolmelamine and pentamethylolmelamine, which is applied in the field of joint production process, can solve the problems of high production cost and serious environmental pollution, achieve zero pollution discharge and reduce production cost

Active Publication Date: 2017-10-13
CHONGQING JIANFENG HAOKANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Pentamethylol melamine can be used as a raw material for the production of various types of high imino type etherified amino resins, but its production cost is high and the environment is seriously polluted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1.1) According to the molar ratio of melamine: formaldehyde: water of 1: 4.5: 10, feed into the pentahydroxylation reactor. First add the above-mentioned metered water into the reactor; adjust the speed of the reactor agitator to 70 rpm, then add the above-mentioned metered formaldehyde, the formaldehyde used is a formaldehyde aqueous solution with a mass fraction of 37%; add 30% sodium hydroxide aqueous solution to adjust the pH value to 8.0, adjust the temperature to 30°C and add the above-mentioned measured melamine; stir for 30 minutes and then raise the temperature to 45°C, and then use 30% sodium hydroxide aqueous solution to keep the pH at 8.0;

[0046] 1.2) After the melamine is completely dissolved, reduce the stirring speed of the reactor, adjust the stirring speed to 50 rpm, and keep the reaction for 3 hours;

[0047] 1.3) Stop stirring, stand for crystallization for 1 hour, centrifuge, remove waste water, and dry to obtain the finished product pentamylolmela...

Embodiment 2

[0078] In the above step 1.1), the molar ratio of melamine, formaldehyde and water is 1:5.5:20. Wherein the formaldehyde used is 40% formaldehyde aqueous solution, and alkali is substituted as 30% potassium carbonate aqueous solution, other conditions are unchanged;

[0079] In the above step 1.2), keep the reaction for 4h, and keep the others unchanged;

[0080] In the above-mentioned step 1.3), stand for crystallization for 3 hours to obtain a white granular solid of pentamethylol melamine, with a conversion rate of 80% (calculated as melamine);

[0081] In the above step 1.4), the wastewater generated in the above step 1.3) is collected for producing hexamethylolmelamine.

Embodiment 3

[0083] In the above step 1.1), the molar ratio of melamine, formaldehyde and water is 1:6.0:20. Wherein the formaldehyde used is 37% formaldehyde aqueous solution, the alkali is replaced by 30% sodium carbonate aqueous solution, other conditions are unchanged;

[0084] In the above step 1.2), keep the reaction for 3.5h, and keep the others unchanged;

[0085] In the above-mentioned step 1.3), stand for crystallization for 2 hours to obtain a white granular solid of pentamethylolmelamine, with a conversion rate of 85% (calculated as melamine);

[0086] In the above step 1.4), the wastewater generated in the above step 1.3) is collected for producing hexamethylolmelamine.

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Abstract

A pentahydroxy-methylmelamine and hexahydroxy-methylmelamine joint-production method comprises the steps that melamine, formaldehyde and water are put in a penta-hydroxylation reaction kettle according to stoichiometric ratio; a reactant is centrifugally separated, wastewater is removed, and a finished product pentahydroxy-methylmelamine is obtained after drying; part of wastewater is returned to the penta-hydroxylation reaction kettle for repeated production, and the rest is introduced into a hexa-hydroxylation reaction kettle to serve as part of mother liquor for producing hexahydroxy-methylmelamine. According to the joint-production process, pentahydroxy wastewater and hexahydroxy wastewater can be used for cyclic and joint production, accordingly the production costs of a pentahydroxy product and a hexahydroxy product are remarkably reduced, especially the production cost of the pentahydroxy product, and meanwhile zero-pollution discharge is achieved.

Description

technical field [0001] The invention relates to a combined production process of pentamethylol melamine and hexamethylol melamine. Background technique [0002] Pentamethylol melamine can be used as a raw material for producing various types of high imino type etherified amino resins, but its production cost is high and the environment is seriously polluted. Contents of the invention [0003] The purpose of the present invention is to provide a co-production process or method of pentamethylol melamine and hexamethylol melamine, which can overcome the above problems. [0004] According to the combined production process of pentamylolmelamine and hexamethylolmelamine of the present invention, comprising: [0005] 1.1) According to the melamine: formaldehyde: water molar ratio is 1: (4.5 ~ 6.0): (8 ~ 20) in the five hydroxylation reaction kettle feeding, feeding process is: first add the above-mentioned water in the reaction kettle; adjust the reaction The rotation speed of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D251/64
CPCC07D251/64
Inventor 王文武胡劲松周建平张志轩
Owner CHONGQING JIANFENG HAOKANG CHEM
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