Trimeric cyanamide joint production method using one step method

A melamine and step method technology, applied in the field of one-step melamine co-production, can solve the problems of long equipment life, high consumption of raw materials and energy, and low labor intensity, and achieve the effects of good product quality, low raw material consumption, and low labor intensity

Inactive Publication Date: 2004-05-05
河南金山化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology provides an improved way for producing nitrogen compounds from urea solution without consuming too much energy during manufacturing processes compared to traditional methods like double step techniques that require both steps separately. It also reduces costs while still maintaining excellent yields due to its use of compressed air instead of liquid ammoniums. By combining these technical features into one single unit, this technique can be applied more efficiently on different types of reactors.

Problems solved by technology

This patented technical problem addressed in this patents relates to producing melanin from urea that meets strict regulations while being more efficient than traditional ways such as pressurized air stripping and nitrogen oxide catalysts.

Method used

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  • Trimeric cyanamide joint production method using one step method
  • Trimeric cyanamide joint production method using one step method
  • Trimeric cyanamide joint production method using one step method

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Embodiment 1

[0019] Embodiment 1, with reference to accompanying drawing, directly select the ammonia gas that comes over from synthetic ammonia workshop section, pressure 0.10~0.15MPa, temperature is 0~5 ℃, every production 1 ton of melamine needs 4400~4800 kilograms of ammonia gas, through carrier gas ammonia vapor The preheater is preheated to 150°C, the pressure is 0.10-0.15MPa, and then heated to 350-400°C by the carrier gas ammonia molten salt preheater; then it enters the fluidized bed reactor as the carrier gas ammonia of the fluidized bed. When the fluidized bed reaction temperature is 380-400°C, the liquid urea branched from the liquid urea circulation pump enters the fluidized bed reactor, and 3.05-3.15 tons of liquid urea is needed to produce 1 ton of melamine. Under the action of catalyst silica gel 60-70 grams of urea can be cast per kilogram of silica gel, and melamine gas is generated through a series of reactions; the melamine-containing gas reacted from the fluidized bed i...

Embodiment 2

[0020] Embodiment 2, with reference to accompanying drawing, directly select the ammonia gas that comes over from synthetic ammonia workshop section, pressure 0.10~0.15MPa, temperature is 0~5 ℃, every production 1 ton of melamine needs 4400~4800 kilograms of ammonia gas, through carrier gas ammonia vapor The preheater is preheated to 150°C, the pressure is 0.10-0.15MPa, and then heated to 350-400°C by the carrier gas ammonia molten salt preheater; then it enters the fluidized bed reactor as the carrier gas ammonia of the fluidized bed. Under the condition that the fluidized bed reaction temperature is 380-400°C, the liquid urea branched from the liquid urea circulation pump enters the fluidized-bed reactor, and 3.05-3.15 tons of liquid urea is needed for every ton of melamine produced. Under the action, 60-70 grams of urea can be cast per kilogram of silica-alumina glue, and melamine gas is generated through a series of reactions; the melamine-containing gas reacted from the fl...

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Abstract

A one-step process for preparing both cyanuramide and the ammonium hydrogen carbonate/sodium carbonate and ammonium chloride features that the synthetic amonia is directly delivered to the cyanuramide preparing step, where it is preheated to 350-400 deg.C and used as gas carrier of fluidized bed, and the gas from liquid urea washing tower is divdied into two channels, one returning back to crystallizer and used as cold gas and another being directly used to prepare ammonium hydrogen carbonate/sodium carbonate and ammonium chloiride. Its advantages are low cost and high catalytic efficiency.

Description

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Claims

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Application Information

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Owner 河南金山化工有限责任公司
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