This document provides information on formaldehyde and its derivatives from Primary Information Services. It summarizes various manufacturing processes for formaldehyde and formaldehyde-based resins. It also advertises Primary Information Services' databases covering topics like aqueous formaldehyde production, melamine formaldehyde resins, methylal, dicyandiamide formaldehyde, and more. Contact information is provided for inquiries.

1. Formaldehyde & Derivatives
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Formaldehyde
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8. Aqueous Formaldehyde
The process comprises the following steps:
• Evaporation of Methanol.
• Mixing of gaseous Methanol with air, steam and recycle gas
• Oxidation of Methanol to Formaldehyde in an water cooled tubular catalytic
Reactor.
• Absorption of Formaldehyde in De-Mineralized Water
Formation of Formaldehyde takes place in a Reactor filled with Catalyst.
In this process Silver is used as a Catalyst for the conversion of Methanol to
Formaldehyde.

9. Phenolic formaldehyde was synthesized
by the condensation of phenol with
formaldehyde in the presence of acetic
acid and catalytical amount of sulphuric
acid.

11. Melamine
Formaldehyde
Resins
• Melamine formaldehyde (MF) resin is
primarily made up of melamine and
formaldehyde here formaldehyde acts
as the cross linker.
• The melamine reacts with
formaldehyde under slightly alkaline
conditions to form the mixtures of
various methylolmelamines,
• Further heating causes the
condensation of these
methylolmelamines into the melamine
formaldehyde resin.

12. Urea Formaldehyde Resin

14. Paraformaldehyde
There are mainly two kinds of
paraformaldehyde production
processes : one is a vacuum rake
type drying production process ,
another is spray drying
production process.

15. Paraformaldehyde
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17. Sulphonated Naphthalene Formaldehyde
(SNF)

19. Hexamine

20. Plant & Machinery suppliers

21. Methylal
Manufacturing process
Methanol and Formaldehyde are pumped into the fixed bed Catalytic Reactor in
appropriate proportions. The reaction temperature is controlled at 60 ～85 . The
obtained mixing solution of Methylal, Methanol and water is heated for evaporation
by the re-boiler steam at the bottom of distillation column. The compositions with
low volatility are collected at the top through screen packing, while the heavy
fraction remains at the column bottom. The azeotropic fraction of Methylal and
Methanol from the column top is condensed and sent to the reflux tank. Part of it
returns to the top of the tower for circulation, and part of it is collected as 92%
Methylal solution, which is pumped to multi-pressure Distillation Column with a
pressure range of 1.2 Mpa to 1.5

22. Due to the azeotrope from methylal, formaldehyde and water, normal rectification methods do not
achieve a high methylal concentration. Based on the original process for normal concentrations,
after researching, numerous tests and multiple technical designs, successfully created a high
concentration methylal process, ensuring the methylal purity reaches up to 99.5%.

23. Dicyandiamide Formaldehyde
The resin is synthesized from
dicyandiamide and formaldehyde
under acidic conditions and the
degree of polymerization was
highly dependent on the molar ratio
of reactants, reaction temperature,
reaction time, and acid
concentration
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24. Formalin
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25. RF Resins
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Preparation Process, Technology,
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https://www.primaryinfo.com/rf-resins.htm

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