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Equipment for crystallizing melamine and by-product thereof by cooling

A technology of melamine and cooling crystallization, which is applied in chemical instruments and methods, organic chemistry, separation methods, etc., can solve the problems of large investment, short operation period, and high energy consumption of air-conditioning fans, so as to reduce investment, reduce separation equipment, and save cycles The effect of water volume

Inactive Publication Date: 2012-07-18
丁泽华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chinese patent "03159274.0" proposes a scheme for producing melamine by co-production method. The disadvantages of this scheme are large investment, short operation period and high energy consumption of air-conditioning fan

Method used

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  • Equipment for crystallizing melamine and by-product thereof by cooling
  • Equipment for crystallizing melamine and by-product thereof by cooling
  • Equipment for crystallizing melamine and by-product thereof by cooling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Such as figure 1 As shown, the coaxial double-layer fluidized bed used for cooling crystallization of melamine by-products is provided with a riser 1 in the center, a hot gas inlet 7 is arranged at the lower part of the riser, and an internal cooler 5 and a solid state are set outside the riser. The cooling bed 6 filled with materials, the bottom of the cooling bed is provided with a fluidization gas inlet 4, the top of the cooling bed is provided with a fluidization gas outlet 10, the outlet of the riser is connected with the inlet of the cyclone separator 8, and the upper part of the cyclone separator is provided with a hot gas outlet 9, The feeding pipe I of the cyclone separator extends into the cooling bed, and the lower part of the cooling bed is provided with the feeding pipe II 2 for the solid cold material, and the feeding pipe II is provided with a control valve 3, and the feeding pipe II is connected to the riser bottom.

[0017] The cooling and crystallizat...

Embodiment 2

[0020] Such as figure 2 As shown, the coaxial double-layer fluidized bed used for cooling crystallization of melamine is provided with a riser 19 in the center, and a hot gas inlet 18 is provided at the bottom of the riser, and a cooler 22 and a filling device are set outside the riser. Cooling bed 23 for solid melamine material, fluidization gas inlet 16 is provided at the bottom of the cooling bed, melamine discharge port 17 is provided at the middle of the cooling bed, fluidization gas outlet 15 is provided at the upper part of the cooling bed, and hot air heating is provided at the upper part of the cooling bed Jacket 24, hot blast jacket is provided with hot blast inlet 13 and outlet 14, and riser outlet is connected with the inlet of cyclone separator 12, and the top of cyclone separator is provided with hot gas outlet 11, and the feeding pipe 1 of cyclone separator stretches into cooling bed Inside, the lower part of the cooling bed is provided with a feed pipe II20 fo...

Embodiment 3

[0024] Utilize the melamine described in above-mentioned embodiment 1, 2 and the cooling crystallization method of by-product can obtain a kind of melamine co-production process with the least investment, the design operating pressure of this device reactor is determined according to the pressure of the external ammonia gas source The optional pressure is 0.25~0.45MPa (absolute pressure) in the combined alkali unit. The process is as follows:

[0025] The pure ammonia gas coming from the synthetic ammonia evaporator or the soda external cooler with an absolute pressure of 0.25-0.45MPa is preheated by the steam preheater and the molten salt preheater successively, and then sent into the fluidized bed as carrier gas. The mass ratio of pure ammonia to liquid urine is 1-1.75. The fluidized bed is filled with a catalyst with an average particle size of preferably 50-70 μm, and the catalyst can be amorphous silica-alumina gel, molecular sieve-aluminosilicate composite catalyst, sil...

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Abstract

The invention provides equipment for crystallizing melamine and by-product thereof by cooling. The equipment is a coaxial double-layer fluidized bed, wherein the centre of the coaxial double-layer fluidized bed is provided with a riser; the lower part of the riser is provided with a hot gas inlet; a cooling bed is sleeved outside the riser; the bottom of the cooling bed is provided with a fluidization gas inlet and the top of the cooling bed is provided with a fluidization gas outlet; an outlet of the riser is connected with an inlet of a cyclone separator; the upper part of the cyclone separator is provided with a hot gas outlet; a feeding tube I of the cyclone separator extends into the cooling bed; the lower part of the cooling bend is provided with a feeding tube II for a solid cold material; and the feeding tube II is provided with a control valve and connected to the bottom of the riser. By using the equipment, the load is reduced, the amount of circulating water is saved, the cold air circulating fan is saved, the investment in the equipment is reduced and the influence of the urine brought in a crystallizer and stripping of wall accretion of the crystallizer on the runningperiod of the system and the product quality is completely eliminated.

Description

technical field [0001] The invention is a process device for producing melamine by catalytic reaction of normal and low pressure urea, and particularly relates to a device for cooling crystallized melamine and its by-products. technical background [0002] The representative processes of normal and low pressure melamine production include the normal pressure method of the German BASF company and the low pressure method of the Dutch DSM company, as well as various melamine co-production processes and various improved normal pressure cycle processes in my country. The common points of these processes need to be The melamine by-product and melamine change from gaseous to solid state and are separated separately from the process gas. However, different processing methods will greatly affect the manufacturing cost of melamine and the operating cycle of the device, as well as the stability of product quality. [0003] The low-pressure process of the Dutch DSM company is: the proce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D7/02C07D251/62
Inventor 丁泽华
Owner 丁泽华